Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "mutex.h" |
| 18 | |
| 19 | #include <errno.h> |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 20 | #include <sys/time.h> |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 21 | |
Andreas Gampe | 46ee31b | 2016-12-14 10:11:49 -0800 | [diff] [blame] | 22 | #include "android-base/stringprintf.h" |
| 23 | |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 24 | #include "atomic.h" |
Elliott Hughes | 07ed66b | 2012-12-12 18:34:25 -0800 | [diff] [blame] | 25 | #include "base/logging.h" |
Mathieu Chartier | 32ce2ad | 2016-03-04 14:58:03 -0800 | [diff] [blame] | 26 | #include "base/systrace.h" |
Andreas Gampe | 8cf9cb3 | 2017-07-19 09:28:38 -0700 | [diff] [blame] | 27 | #include "base/time_utils.h" |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 28 | #include "base/value_object.h" |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame] | 29 | #include "mutex-inl.h" |
Mathieu Chartier | 0795f23 | 2016-09-27 18:43:30 -0700 | [diff] [blame] | 30 | #include "scoped_thread_state_change-inl.h" |
Ian Rogers | 04d7aa9 | 2013-03-16 14:29:17 -0700 | [diff] [blame] | 31 | #include "thread-inl.h" |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 32 | |
| 33 | namespace art { |
| 34 | |
Andreas Gampe | 46ee31b | 2016-12-14 10:11:49 -0800 | [diff] [blame] | 35 | using android::base::StringPrintf; |
| 36 | |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 37 | static Atomic<Locks::ClientCallback*> safe_to_call_abort_callback(nullptr); |
| 38 | |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 39 | Mutex* Locks::abort_lock_ = nullptr; |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 40 | Mutex* Locks::alloc_tracker_lock_ = nullptr; |
Andreas Gampe | 7424081 | 2014-04-17 10:35:09 -0700 | [diff] [blame] | 41 | Mutex* Locks::allocated_monitor_ids_lock_ = nullptr; |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 42 | Mutex* Locks::allocated_thread_ids_lock_ = nullptr; |
Sebastien Hertz | ed2be17 | 2014-08-19 15:33:43 +0200 | [diff] [blame] | 43 | ReaderWriterMutex* Locks::breakpoint_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 44 | ReaderWriterMutex* Locks::classlinker_classes_lock_ = nullptr; |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 45 | Mutex* Locks::deoptimization_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 46 | ReaderWriterMutex* Locks::heap_bitmap_lock_ = nullptr; |
Mathieu Chartier | 9ef78b5 | 2014-09-25 17:03:12 -0700 | [diff] [blame] | 47 | Mutex* Locks::instrument_entrypoints_lock_ = nullptr; |
Mathieu Chartier | a5a53ef | 2014-09-12 12:58:05 -0700 | [diff] [blame] | 48 | Mutex* Locks::intern_table_lock_ = nullptr; |
Andreas Gampe | c808954 | 2017-01-16 12:41:12 -0800 | [diff] [blame] | 49 | Mutex* Locks::jni_function_table_lock_ = nullptr; |
Ian Rogers | 68d8b42 | 2014-07-17 11:09:10 -0700 | [diff] [blame] | 50 | Mutex* Locks::jni_libraries_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 51 | Mutex* Locks::logging_lock_ = nullptr; |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 52 | Mutex* Locks::modify_ldt_lock_ = nullptr; |
Yu Li | eac4424 | 2015-06-29 10:50:03 +0800 | [diff] [blame] | 53 | MutatorMutex* Locks::mutator_lock_ = nullptr; |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 54 | Mutex* Locks::profiler_lock_ = nullptr; |
Nicolas Geoffray | 340dafa | 2016-11-18 16:03:10 +0000 | [diff] [blame] | 55 | ReaderWriterMutex* Locks::verifier_deps_lock_ = nullptr; |
Mathieu Chartier | f9c6fc6 | 2015-10-07 11:44:05 -0700 | [diff] [blame] | 56 | ReaderWriterMutex* Locks::oat_file_manager_lock_ = nullptr; |
Richard Uhler | a206c74 | 2016-05-24 15:04:22 -0700 | [diff] [blame] | 57 | Mutex* Locks::host_dlopen_handles_lock_ = nullptr; |
Mathieu Chartier | a5a53ef | 2014-09-12 12:58:05 -0700 | [diff] [blame] | 58 | Mutex* Locks::reference_processor_lock_ = nullptr; |
| 59 | Mutex* Locks::reference_queue_cleared_references_lock_ = nullptr; |
| 60 | Mutex* Locks::reference_queue_finalizer_references_lock_ = nullptr; |
| 61 | Mutex* Locks::reference_queue_phantom_references_lock_ = nullptr; |
| 62 | Mutex* Locks::reference_queue_soft_references_lock_ = nullptr; |
| 63 | Mutex* Locks::reference_queue_weak_references_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 64 | Mutex* Locks::runtime_shutdown_lock_ = nullptr; |
Mingyao Yang | 063fc77 | 2016-08-02 11:02:54 -0700 | [diff] [blame] | 65 | Mutex* Locks::cha_lock_ = nullptr; |
Igor Murashkin | 495e783 | 2017-10-27 10:56:20 -0700 | [diff] [blame] | 66 | Mutex* Locks::subtype_check_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 67 | Mutex* Locks::thread_list_lock_ = nullptr; |
Mathieu Chartier | 91e5669 | 2015-03-03 13:51:04 -0800 | [diff] [blame] | 68 | ConditionVariable* Locks::thread_exit_cond_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 69 | Mutex* Locks::thread_suspend_count_lock_ = nullptr; |
| 70 | Mutex* Locks::trace_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 71 | Mutex* Locks::unexpected_signal_lock_ = nullptr; |
Alex Light | 88fd720 | 2017-06-30 08:31:59 -0700 | [diff] [blame] | 72 | Mutex* Locks::user_code_suspension_lock_ = nullptr; |
Andreas Gampe | 5bdb655 | 2015-07-22 23:44:55 -0700 | [diff] [blame] | 73 | Uninterruptible Roles::uninterruptible_; |
Andreas Gampe | 05a364c | 2016-10-14 13:27:12 -0700 | [diff] [blame] | 74 | ReaderWriterMutex* Locks::jni_globals_lock_ = nullptr; |
| 75 | Mutex* Locks::jni_weak_globals_lock_ = nullptr; |
Andreas Gampe | cc1b535 | 2016-12-01 16:58:38 -0800 | [diff] [blame] | 76 | ReaderWriterMutex* Locks::dex_lock_ = nullptr; |
Hiroshi Yamauchi | a222404 | 2017-02-08 16:35:45 -0800 | [diff] [blame] | 77 | std::vector<BaseMutex*> Locks::expected_mutexes_on_weak_ref_access_; |
Hiroshi Yamauchi | 8a43324 | 2017-03-07 14:39:22 -0800 | [diff] [blame] | 78 | Atomic<const BaseMutex*> Locks::expected_mutexes_on_weak_ref_access_guard_; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 79 | |
| 80 | struct AllMutexData { |
| 81 | // A guard for all_mutexes_ that's not a mutex (Mutexes must CAS to acquire and busy wait). |
| 82 | Atomic<const BaseMutex*> all_mutexes_guard; |
| 83 | // All created mutexes guarded by all_mutexes_guard_. |
| 84 | std::set<BaseMutex*>* all_mutexes; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 85 | AllMutexData() : all_mutexes(nullptr) {} |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 86 | }; |
| 87 | static struct AllMutexData gAllMutexData[kAllMutexDataSize]; |
| 88 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 89 | #if ART_USE_FUTEXES |
| 90 | static bool ComputeRelativeTimeSpec(timespec* result_ts, const timespec& lhs, const timespec& rhs) { |
Brian Carlstrom | fb6996f | 2013-07-18 18:21:14 -0700 | [diff] [blame] | 91 | const int32_t one_sec = 1000 * 1000 * 1000; // one second in nanoseconds. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 92 | result_ts->tv_sec = lhs.tv_sec - rhs.tv_sec; |
| 93 | result_ts->tv_nsec = lhs.tv_nsec - rhs.tv_nsec; |
| 94 | if (result_ts->tv_nsec < 0) { |
| 95 | result_ts->tv_sec--; |
| 96 | result_ts->tv_nsec += one_sec; |
| 97 | } else if (result_ts->tv_nsec > one_sec) { |
| 98 | result_ts->tv_sec++; |
| 99 | result_ts->tv_nsec -= one_sec; |
| 100 | } |
| 101 | return result_ts->tv_sec < 0; |
| 102 | } |
| 103 | #endif |
| 104 | |
Hans Boehm | ae915a0 | 2017-12-12 11:05:32 -0800 | [diff] [blame^] | 105 | // Wait for an amount of time that roughly increases in the argument i. |
| 106 | // Spin for small arguments and yield/sleep for longer ones. |
| 107 | static void BackOff(uint32_t i) { |
| 108 | static constexpr uint32_t kSpinMax = 10; |
| 109 | static constexpr uint32_t kYieldMax = 20; |
| 110 | if (i <= kSpinMax) { |
| 111 | // TODO: Esp. in very latency-sensitive cases, consider replacing this with an explicit |
| 112 | // test-and-test-and-set loop in the caller. Possibly skip entirely on a uniprocessor. |
| 113 | volatile uint32_t x = 0; |
| 114 | const uint32_t spin_count = 10 * i; |
| 115 | for (uint32_t spin = 0; spin < spin_count; ++spin) { |
| 116 | ++x; // Volatile; hence should not be optimized away. |
| 117 | } |
| 118 | // TODO: Consider adding x86 PAUSE and/or ARM YIELD here. |
| 119 | } else if (i <= kYieldMax) { |
| 120 | sched_yield(); |
| 121 | } else { |
| 122 | NanoSleep(1000ull * (i - kYieldMax)); |
| 123 | } |
| 124 | } |
| 125 | |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 126 | class ScopedAllMutexesLock FINAL { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 127 | public: |
Brian Carlstrom | 93ba893 | 2013-07-17 21:31:49 -0700 | [diff] [blame] | 128 | explicit ScopedAllMutexesLock(const BaseMutex* mutex) : mutex_(mutex) { |
Hans Boehm | ae915a0 | 2017-12-12 11:05:32 -0800 | [diff] [blame^] | 129 | for (uint32_t i = 0; |
| 130 | !gAllMutexData->all_mutexes_guard.CompareExchangeWeakAcquire(0, mutex); |
| 131 | ++i) { |
| 132 | BackOff(i); |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 133 | } |
| 134 | } |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 135 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 136 | ~ScopedAllMutexesLock() { |
Hans Boehm | ae915a0 | 2017-12-12 11:05:32 -0800 | [diff] [blame^] | 137 | DCHECK_EQ(gAllMutexData->all_mutexes_guard.LoadRelaxed(), mutex_); |
| 138 | gAllMutexData->all_mutexes_guard.StoreRelease(0); |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 139 | } |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 140 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 141 | private: |
| 142 | const BaseMutex* const mutex_; |
| 143 | }; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 144 | |
Hiroshi Yamauchi | 8a43324 | 2017-03-07 14:39:22 -0800 | [diff] [blame] | 145 | class Locks::ScopedExpectedMutexesOnWeakRefAccessLock FINAL { |
| 146 | public: |
| 147 | explicit ScopedExpectedMutexesOnWeakRefAccessLock(const BaseMutex* mutex) : mutex_(mutex) { |
Hans Boehm | ae915a0 | 2017-12-12 11:05:32 -0800 | [diff] [blame^] | 148 | for (uint32_t i = 0; |
| 149 | !Locks::expected_mutexes_on_weak_ref_access_guard_.CompareExchangeWeakAcquire(0, mutex); |
| 150 | ++i) { |
| 151 | BackOff(i); |
Hiroshi Yamauchi | 8a43324 | 2017-03-07 14:39:22 -0800 | [diff] [blame] | 152 | } |
| 153 | } |
| 154 | |
| 155 | ~ScopedExpectedMutexesOnWeakRefAccessLock() { |
Hans Boehm | ae915a0 | 2017-12-12 11:05:32 -0800 | [diff] [blame^] | 156 | DCHECK_EQ(Locks::expected_mutexes_on_weak_ref_access_guard_.LoadRelaxed(), mutex_); |
| 157 | Locks::expected_mutexes_on_weak_ref_access_guard_.StoreRelease(0); |
Hiroshi Yamauchi | 8a43324 | 2017-03-07 14:39:22 -0800 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | private: |
| 161 | const BaseMutex* const mutex_; |
| 162 | }; |
| 163 | |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 164 | // Scoped class that generates events at the beginning and end of lock contention. |
| 165 | class ScopedContentionRecorder FINAL : public ValueObject { |
| 166 | public: |
| 167 | ScopedContentionRecorder(BaseMutex* mutex, uint64_t blocked_tid, uint64_t owner_tid) |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 168 | : mutex_(kLogLockContentions ? mutex : nullptr), |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 169 | blocked_tid_(kLogLockContentions ? blocked_tid : 0), |
| 170 | owner_tid_(kLogLockContentions ? owner_tid : 0), |
| 171 | start_nano_time_(kLogLockContentions ? NanoTime() : 0) { |
| 172 | if (ATRACE_ENABLED()) { |
| 173 | std::string msg = StringPrintf("Lock contention on %s (owner tid: %" PRIu64 ")", |
| 174 | mutex->GetName(), owner_tid); |
| 175 | ATRACE_BEGIN(msg.c_str()); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | ~ScopedContentionRecorder() { |
| 180 | ATRACE_END(); |
| 181 | if (kLogLockContentions) { |
| 182 | uint64_t end_nano_time = NanoTime(); |
| 183 | mutex_->RecordContention(blocked_tid_, owner_tid_, end_nano_time - start_nano_time_); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | private: |
| 188 | BaseMutex* const mutex_; |
| 189 | const uint64_t blocked_tid_; |
| 190 | const uint64_t owner_tid_; |
| 191 | const uint64_t start_nano_time_; |
| 192 | }; |
| 193 | |
Hiroshi Yamauchi | a222404 | 2017-02-08 16:35:45 -0800 | [diff] [blame] | 194 | BaseMutex::BaseMutex(const char* name, LockLevel level) |
| 195 | : level_(level), |
| 196 | name_(name), |
| 197 | should_respond_to_empty_checkpoint_request_(false) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 198 | if (kLogLockContentions) { |
| 199 | ScopedAllMutexesLock mu(this); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 200 | std::set<BaseMutex*>** all_mutexes_ptr = &gAllMutexData->all_mutexes; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 201 | if (*all_mutexes_ptr == nullptr) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 202 | // We leak the global set of all mutexes to avoid ordering issues in global variable |
| 203 | // construction/destruction. |
| 204 | *all_mutexes_ptr = new std::set<BaseMutex*>(); |
| 205 | } |
| 206 | (*all_mutexes_ptr)->insert(this); |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 207 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | BaseMutex::~BaseMutex() { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 211 | if (kLogLockContentions) { |
| 212 | ScopedAllMutexesLock mu(this); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 213 | gAllMutexData->all_mutexes->erase(this); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 214 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | void BaseMutex::DumpAll(std::ostream& os) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 218 | if (kLogLockContentions) { |
| 219 | os << "Mutex logging:\n"; |
| 220 | ScopedAllMutexesLock mu(reinterpret_cast<const BaseMutex*>(-1)); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 221 | std::set<BaseMutex*>* all_mutexes = gAllMutexData->all_mutexes; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 222 | if (all_mutexes == nullptr) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 223 | // No mutexes have been created yet during at startup. |
| 224 | return; |
| 225 | } |
| 226 | typedef std::set<BaseMutex*>::const_iterator It; |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 227 | os << "(Contended)\n"; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 228 | for (It it = all_mutexes->begin(); it != all_mutexes->end(); ++it) { |
| 229 | BaseMutex* mutex = *it; |
| 230 | if (mutex->HasEverContended()) { |
| 231 | mutex->Dump(os); |
| 232 | os << "\n"; |
| 233 | } |
| 234 | } |
| 235 | os << "(Never contented)\n"; |
| 236 | for (It it = all_mutexes->begin(); it != all_mutexes->end(); ++it) { |
| 237 | BaseMutex* mutex = *it; |
| 238 | if (!mutex->HasEverContended()) { |
| 239 | mutex->Dump(os); |
| 240 | os << "\n"; |
| 241 | } |
| 242 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 243 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 244 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 245 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 246 | void BaseMutex::CheckSafeToWait(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 247 | if (self == nullptr) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 248 | CheckUnattachedThread(level_); |
| 249 | return; |
| 250 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 251 | if (kDebugLocking) { |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 252 | CHECK(self->GetHeldMutex(level_) == this || level_ == kMonitorLock) |
| 253 | << "Waiting on unacquired mutex: " << name_; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 254 | bool bad_mutexes_held = false; |
Elliott Hughes | 0f82716 | 2013-02-26 12:12:58 -0800 | [diff] [blame] | 255 | for (int i = kLockLevelCount - 1; i >= 0; --i) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 256 | if (i != level_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 257 | BaseMutex* held_mutex = self->GetHeldMutex(static_cast<LockLevel>(i)); |
Alex Light | 79400aa | 2017-07-18 15:34:21 -0700 | [diff] [blame] | 258 | // We allow the thread to wait even if the user_code_suspension_lock_ is held so long as we |
| 259 | // are some thread's resume_cond_ (level_ == kThreadSuspendCountLock). This just means that |
| 260 | // gc or some other internal process is suspending the thread while it is trying to suspend |
| 261 | // some other thread. So long as the current thread is not being suspended by a |
| 262 | // SuspendReason::kForUserCode (which needs the user_code_suspension_lock_ to clear) this is |
| 263 | // fine. |
| 264 | if (held_mutex == Locks::user_code_suspension_lock_ && level_ == kThreadSuspendCountLock) { |
| 265 | // No thread safety analysis is fine since we have both the user_code_suspension_lock_ |
| 266 | // from the line above and the ThreadSuspendCountLock since it is our level_. We use this |
| 267 | // lambda to avoid having to annotate the whole function as NO_THREAD_SAFETY_ANALYSIS. |
| 268 | auto is_suspending_for_user_code = [self]() NO_THREAD_SAFETY_ANALYSIS { |
| 269 | return self->GetUserCodeSuspendCount() != 0; |
| 270 | }; |
| 271 | if (is_suspending_for_user_code()) { |
| 272 | LOG(ERROR) << "Holding \"" << held_mutex->name_ << "\" " |
| 273 | << "(level " << LockLevel(i) << ") while performing wait on " |
| 274 | << "\"" << name_ << "\" (level " << level_ << ") " |
| 275 | << "with SuspendReason::kForUserCode pending suspensions"; |
| 276 | bad_mutexes_held = true; |
| 277 | } |
| 278 | } else if (held_mutex != nullptr) { |
Elliott Hughes | 0f82716 | 2013-02-26 12:12:58 -0800 | [diff] [blame] | 279 | LOG(ERROR) << "Holding \"" << held_mutex->name_ << "\" " |
| 280 | << "(level " << LockLevel(i) << ") while performing wait on " |
| 281 | << "\"" << name_ << "\" (level " << level_ << ")"; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 282 | bad_mutexes_held = true; |
| 283 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 284 | } |
| 285 | } |
Nicolas Geoffray | db97871 | 2014-12-09 13:33:38 +0000 | [diff] [blame] | 286 | if (gAborting == 0) { // Avoid recursive aborts. |
Alex Light | 79400aa | 2017-07-18 15:34:21 -0700 | [diff] [blame] | 287 | CHECK(!bad_mutexes_held) << this; |
Nicolas Geoffray | db97871 | 2014-12-09 13:33:38 +0000 | [diff] [blame] | 288 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 289 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 290 | } |
| 291 | |
Ian Rogers | 37f3c96 | 2014-07-17 11:25:30 -0700 | [diff] [blame] | 292 | void BaseMutex::ContentionLogData::AddToWaitTime(uint64_t value) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 293 | if (kLogLockContentions) { |
| 294 | // Atomically add value to wait_time. |
Ian Rogers | 37f3c96 | 2014-07-17 11:25:30 -0700 | [diff] [blame] | 295 | wait_time.FetchAndAddSequentiallyConsistent(value); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 296 | } |
| 297 | } |
| 298 | |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 299 | void BaseMutex::RecordContention(uint64_t blocked_tid, |
| 300 | uint64_t owner_tid, |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 301 | uint64_t nano_time_blocked) { |
| 302 | if (kLogLockContentions) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 303 | ContentionLogData* data = contention_log_data_; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 304 | ++(data->contention_count); |
| 305 | data->AddToWaitTime(nano_time_blocked); |
| 306 | ContentionLogEntry* log = data->contention_log; |
| 307 | // This code is intentionally racy as it is only used for diagnostics. |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 308 | uint32_t slot = data->cur_content_log_entry.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 309 | if (log[slot].blocked_tid == blocked_tid && |
| 310 | log[slot].owner_tid == blocked_tid) { |
| 311 | ++log[slot].count; |
| 312 | } else { |
| 313 | uint32_t new_slot; |
| 314 | do { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 315 | slot = data->cur_content_log_entry.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 316 | new_slot = (slot + 1) % kContentionLogSize; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 317 | } while (!data->cur_content_log_entry.CompareExchangeWeakRelaxed(slot, new_slot)); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 318 | log[new_slot].blocked_tid = blocked_tid; |
| 319 | log[new_slot].owner_tid = owner_tid; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 320 | log[new_slot].count.StoreRelaxed(1); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 321 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 322 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 323 | } |
| 324 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 325 | void BaseMutex::DumpContention(std::ostream& os) const { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 326 | if (kLogLockContentions) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 327 | const ContentionLogData* data = contention_log_data_; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 328 | const ContentionLogEntry* log = data->contention_log; |
Ian Rogers | 37f3c96 | 2014-07-17 11:25:30 -0700 | [diff] [blame] | 329 | uint64_t wait_time = data->wait_time.LoadRelaxed(); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 330 | uint32_t contention_count = data->contention_count.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 331 | if (contention_count == 0) { |
| 332 | os << "never contended"; |
| 333 | } else { |
| 334 | os << "contended " << contention_count |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 335 | << " total wait of contender " << PrettyDuration(wait_time) |
| 336 | << " average " << PrettyDuration(wait_time / contention_count); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 337 | SafeMap<uint64_t, size_t> most_common_blocker; |
| 338 | SafeMap<uint64_t, size_t> most_common_blocked; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 339 | for (size_t i = 0; i < kContentionLogSize; ++i) { |
| 340 | uint64_t blocked_tid = log[i].blocked_tid; |
| 341 | uint64_t owner_tid = log[i].owner_tid; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 342 | uint32_t count = log[i].count.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 343 | if (count > 0) { |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 344 | auto it = most_common_blocked.find(blocked_tid); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 345 | if (it != most_common_blocked.end()) { |
| 346 | most_common_blocked.Overwrite(blocked_tid, it->second + count); |
| 347 | } else { |
| 348 | most_common_blocked.Put(blocked_tid, count); |
| 349 | } |
| 350 | it = most_common_blocker.find(owner_tid); |
| 351 | if (it != most_common_blocker.end()) { |
| 352 | most_common_blocker.Overwrite(owner_tid, it->second + count); |
| 353 | } else { |
| 354 | most_common_blocker.Put(owner_tid, count); |
| 355 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 356 | } |
| 357 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 358 | uint64_t max_tid = 0; |
| 359 | size_t max_tid_count = 0; |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 360 | for (const auto& pair : most_common_blocked) { |
| 361 | if (pair.second > max_tid_count) { |
| 362 | max_tid = pair.first; |
| 363 | max_tid_count = pair.second; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 364 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 365 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 366 | if (max_tid != 0) { |
| 367 | os << " sample shows most blocked tid=" << max_tid; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 368 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 369 | max_tid = 0; |
| 370 | max_tid_count = 0; |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 371 | for (const auto& pair : most_common_blocker) { |
| 372 | if (pair.second > max_tid_count) { |
| 373 | max_tid = pair.first; |
| 374 | max_tid_count = pair.second; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 375 | } |
| 376 | } |
| 377 | if (max_tid != 0) { |
| 378 | os << " sample shows tid=" << max_tid << " owning during this time"; |
| 379 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 380 | } |
| 381 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 382 | } |
| 383 | |
| 384 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 385 | Mutex::Mutex(const char* name, LockLevel level, bool recursive) |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 386 | : BaseMutex(name, level), exclusive_owner_(0), recursive_(recursive), recursion_count_(0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 387 | #if ART_USE_FUTEXES |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 388 | DCHECK_EQ(0, state_.LoadRelaxed()); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 389 | DCHECK_EQ(0, num_contenders_.LoadRelaxed()); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 390 | #else |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 391 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, nullptr)); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 392 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 393 | } |
| 394 | |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 395 | // Helper to allow checking shutdown while locking for thread safety. |
| 396 | static bool IsSafeToCallAbortSafe() { |
| 397 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
| 398 | return Locks::IsSafeToCallAbortRacy(); |
Andreas Gampe | 8f1fa10 | 2015-01-22 19:48:51 -0800 | [diff] [blame] | 399 | } |
| 400 | |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 401 | Mutex::~Mutex() { |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 402 | bool safe_to_call_abort = Locks::IsSafeToCallAbortRacy(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 403 | #if ART_USE_FUTEXES |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 404 | if (state_.LoadRelaxed() != 0) { |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 405 | LOG(safe_to_call_abort ? FATAL : WARNING) |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 406 | << "destroying mutex with owner: " << GetExclusiveOwnerTid(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 407 | } else { |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 408 | if (GetExclusiveOwnerTid() != 0) { |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 409 | LOG(safe_to_call_abort ? FATAL : WARNING) |
| 410 | << "unexpectedly found an owner on unlocked mutex " << name_; |
Andreas Gampe | 8f1fa10 | 2015-01-22 19:48:51 -0800 | [diff] [blame] | 411 | } |
| 412 | if (num_contenders_.LoadSequentiallyConsistent() != 0) { |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 413 | LOG(safe_to_call_abort ? FATAL : WARNING) |
| 414 | << "unexpectedly found a contender on mutex " << name_; |
Mathieu Chartier | cef50f0 | 2014-12-09 17:38:52 -0800 | [diff] [blame] | 415 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 416 | } |
| 417 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 418 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 419 | // may still be using locks. |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 420 | int rc = pthread_mutex_destroy(&mutex_); |
| 421 | if (rc != 0) { |
| 422 | errno = rc; |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 423 | PLOG(safe_to_call_abort ? FATAL : WARNING) |
| 424 | << "pthread_mutex_destroy failed for " << name_; |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 425 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 426 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 427 | } |
| 428 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 429 | void Mutex::ExclusiveLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 430 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 431 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 432 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 433 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 434 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 435 | #if ART_USE_FUTEXES |
| 436 | bool done = false; |
| 437 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 438 | int32_t cur_state = state_.LoadRelaxed(); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 439 | if (LIKELY(cur_state == 0)) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 440 | // Change state from 0 to 1 and impose load/store ordering appropriate for lock acquisition. |
| 441 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state */, 1 /* new state */); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 442 | } else { |
| 443 | // Failed to acquire, hang up. |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 444 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 445 | num_contenders_++; |
Hiroshi Yamauchi | a222404 | 2017-02-08 16:35:45 -0800 | [diff] [blame] | 446 | if (UNLIKELY(should_respond_to_empty_checkpoint_request_)) { |
| 447 | self->CheckEmptyCheckpointFromMutex(); |
| 448 | } |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 449 | if (futex(state_.Address(), FUTEX_WAIT, 1, nullptr, nullptr, 0) != 0) { |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 450 | // EAGAIN and EINTR both indicate a spurious failure, try again from the beginning. |
| 451 | // We don't use TEMP_FAILURE_RETRY so we can intentionally retry to acquire the lock. |
| 452 | if ((errno != EAGAIN) && (errno != EINTR)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 453 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 454 | } |
| 455 | } |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 456 | num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 457 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 458 | } while (!done); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 459 | DCHECK_EQ(state_.LoadRelaxed(), 1); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 460 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 461 | CHECK_MUTEX_CALL(pthread_mutex_lock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 462 | #endif |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 463 | DCHECK_EQ(GetExclusiveOwnerTid(), 0); |
| 464 | exclusive_owner_.StoreRelaxed(SafeGetTid(self)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 465 | RegisterAsLocked(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 466 | } |
| 467 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 468 | if (kDebugLocking) { |
| 469 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 470 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 471 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 472 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 473 | } |
| 474 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 475 | bool Mutex::ExclusiveTryLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 476 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 477 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 478 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 479 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 480 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 481 | #if ART_USE_FUTEXES |
| 482 | bool done = false; |
| 483 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 484 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 485 | if (cur_state == 0) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 486 | // Change state from 0 to 1 and impose load/store ordering appropriate for lock acquisition. |
| 487 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state */, 1 /* new state */); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 488 | } else { |
| 489 | return false; |
| 490 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 491 | } while (!done); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 492 | DCHECK_EQ(state_.LoadRelaxed(), 1); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 493 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 494 | int result = pthread_mutex_trylock(&mutex_); |
| 495 | if (result == EBUSY) { |
| 496 | return false; |
| 497 | } |
| 498 | if (result != 0) { |
| 499 | errno = result; |
| 500 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 501 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 502 | #endif |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 503 | DCHECK_EQ(GetExclusiveOwnerTid(), 0); |
| 504 | exclusive_owner_.StoreRelaxed(SafeGetTid(self)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 505 | RegisterAsLocked(self); |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 506 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 507 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 508 | if (kDebugLocking) { |
| 509 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 510 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 511 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 512 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 513 | return true; |
| 514 | } |
| 515 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 516 | void Mutex::ExclusiveUnlock(Thread* self) { |
Mathieu Chartier | eb0a179 | 2014-12-15 17:23:45 -0800 | [diff] [blame] | 517 | if (kIsDebugBuild && self != nullptr && self != Thread::Current()) { |
| 518 | std::string name1 = "<null>"; |
| 519 | std::string name2 = "<null>"; |
| 520 | if (self != nullptr) { |
| 521 | self->GetThreadName(name1); |
| 522 | } |
| 523 | if (Thread::Current() != nullptr) { |
| 524 | Thread::Current()->GetThreadName(name2); |
| 525 | } |
Mathieu Chartier | 4c10110 | 2015-01-27 17:14:16 -0800 | [diff] [blame] | 526 | LOG(FATAL) << GetName() << " level=" << level_ << " self=" << name1 |
| 527 | << " Thread::Current()=" << name2; |
Mathieu Chartier | eb0a179 | 2014-12-15 17:23:45 -0800 | [diff] [blame] | 528 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 529 | AssertHeld(self); |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 530 | DCHECK_NE(GetExclusiveOwnerTid(), 0); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 531 | recursion_count_--; |
| 532 | if (!recursive_ || recursion_count_ == 0) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 533 | if (kDebugLocking) { |
| 534 | CHECK(recursion_count_ == 0 || recursive_) << "Unexpected recursion count on mutex: " |
| 535 | << name_ << " " << recursion_count_; |
| 536 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 537 | RegisterAsUnlocked(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 538 | #if ART_USE_FUTEXES |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 539 | bool done = false; |
| 540 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 541 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 542 | if (LIKELY(cur_state == 1)) { |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 543 | // We're no longer the owner. |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 544 | exclusive_owner_.StoreRelaxed(0); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 545 | // Change state to 0 and impose load/store ordering appropriate for lock release. |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 546 | // Note, the relaxed loads below mustn't reorder before the CompareExchange. |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 547 | // TODO: the ordering here is non-trivial as state is split across 3 fields, fix by placing |
| 548 | // a status bit into the state on contention. |
| 549 | done = state_.CompareExchangeWeakSequentiallyConsistent(cur_state, 0 /* new state */); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 550 | if (LIKELY(done)) { // Spurious fail? |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 551 | // Wake a contender. |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 552 | if (UNLIKELY(num_contenders_.LoadRelaxed() > 0)) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 553 | futex(state_.Address(), FUTEX_WAKE, 1, nullptr, nullptr, 0); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 554 | } |
| 555 | } |
| 556 | } else { |
| 557 | // Logging acquires the logging lock, avoid infinite recursion in that case. |
| 558 | if (this != Locks::logging_lock_) { |
| 559 | LOG(FATAL) << "Unexpected state_ in unlock " << cur_state << " for " << name_; |
| 560 | } else { |
Andreas Gampe | 3fec9ac | 2016-09-13 10:47:28 -0700 | [diff] [blame] | 561 | LogHelper::LogLineLowStack(__FILE__, |
| 562 | __LINE__, |
| 563 | ::android::base::FATAL_WITHOUT_ABORT, |
| 564 | StringPrintf("Unexpected state_ %d in unlock for %s", |
| 565 | cur_state, name_).c_str()); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 566 | _exit(1); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 567 | } |
| 568 | } |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 569 | } while (!done); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 570 | #else |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 571 | exclusive_owner_.StoreRelaxed(0); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 572 | CHECK_MUTEX_CALL(pthread_mutex_unlock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 573 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 574 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 575 | } |
| 576 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 577 | void Mutex::Dump(std::ostream& os) const { |
| 578 | os << (recursive_ ? "recursive " : "non-recursive ") |
| 579 | << name_ |
| 580 | << " level=" << static_cast<int>(level_) |
| 581 | << " rec=" << recursion_count_ |
| 582 | << " owner=" << GetExclusiveOwnerTid() << " "; |
| 583 | DumpContention(os); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | std::ostream& operator<<(std::ostream& os, const Mutex& mu) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 587 | mu.Dump(os); |
| 588 | return os; |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 589 | } |
| 590 | |
Hiroshi Yamauchi | a222404 | 2017-02-08 16:35:45 -0800 | [diff] [blame] | 591 | void Mutex::WakeupToRespondToEmptyCheckpoint() { |
| 592 | #if ART_USE_FUTEXES |
| 593 | // Wake up all the waiters so they will respond to the emtpy checkpoint. |
| 594 | DCHECK(should_respond_to_empty_checkpoint_request_); |
| 595 | if (UNLIKELY(num_contenders_.LoadRelaxed() > 0)) { |
| 596 | futex(state_.Address(), FUTEX_WAKE, -1, nullptr, nullptr, 0); |
| 597 | } |
| 598 | #else |
| 599 | LOG(FATAL) << "Non futex case isn't supported."; |
| 600 | #endif |
| 601 | } |
| 602 | |
Brian Carlstrom | 02c8cc6 | 2013-07-18 15:54:44 -0700 | [diff] [blame] | 603 | ReaderWriterMutex::ReaderWriterMutex(const char* name, LockLevel level) |
| 604 | : BaseMutex(name, level) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 605 | #if ART_USE_FUTEXES |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 606 | , state_(0), num_pending_readers_(0), num_pending_writers_(0) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 607 | #endif |
Igor Murashkin | 5573c37 | 2017-11-16 13:34:30 -0800 | [diff] [blame] | 608 | { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 609 | #if !ART_USE_FUTEXES |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 610 | CHECK_MUTEX_CALL(pthread_rwlock_init, (&rwlock_, nullptr)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 611 | #endif |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 612 | exclusive_owner_.StoreRelaxed(0); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 613 | } |
| 614 | |
| 615 | ReaderWriterMutex::~ReaderWriterMutex() { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 616 | #if ART_USE_FUTEXES |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 617 | CHECK_EQ(state_.LoadRelaxed(), 0); |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 618 | CHECK_EQ(GetExclusiveOwnerTid(), 0); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 619 | CHECK_EQ(num_pending_readers_.LoadRelaxed(), 0); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 620 | CHECK_EQ(num_pending_writers_.LoadRelaxed(), 0); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 621 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 622 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 623 | // may still be using locks. |
| 624 | int rc = pthread_rwlock_destroy(&rwlock_); |
| 625 | if (rc != 0) { |
| 626 | errno = rc; |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 627 | bool is_safe_to_call_abort = IsSafeToCallAbortSafe(); |
| 628 | PLOG(is_safe_to_call_abort ? FATAL : WARNING) << "pthread_rwlock_destroy failed for " << name_; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 629 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 630 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 631 | } |
| 632 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 633 | void ReaderWriterMutex::ExclusiveLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 634 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 635 | AssertNotExclusiveHeld(self); |
| 636 | #if ART_USE_FUTEXES |
| 637 | bool done = false; |
| 638 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 639 | int32_t cur_state = state_.LoadRelaxed(); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 640 | if (LIKELY(cur_state == 0)) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 641 | // Change state from 0 to -1 and impose load/store ordering appropriate for lock acquisition. |
| 642 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state*/, -1 /* new state */); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 643 | } else { |
| 644 | // Failed to acquire, hang up. |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 645 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 646 | ++num_pending_writers_; |
Hiroshi Yamauchi | a222404 | 2017-02-08 16:35:45 -0800 | [diff] [blame] | 647 | if (UNLIKELY(should_respond_to_empty_checkpoint_request_)) { |
| 648 | self->CheckEmptyCheckpointFromMutex(); |
| 649 | } |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 650 | if (futex(state_.Address(), FUTEX_WAIT, cur_state, nullptr, nullptr, 0) != 0) { |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 651 | // EAGAIN and EINTR both indicate a spurious failure, try again from the beginning. |
| 652 | // We don't use TEMP_FAILURE_RETRY so we can intentionally retry to acquire the lock. |
| 653 | if ((errno != EAGAIN) && (errno != EINTR)) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 654 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 655 | } |
| 656 | } |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 657 | --num_pending_writers_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 658 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 659 | } while (!done); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 660 | DCHECK_EQ(state_.LoadRelaxed(), -1); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 661 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 662 | CHECK_MUTEX_CALL(pthread_rwlock_wrlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 663 | #endif |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 664 | DCHECK_EQ(GetExclusiveOwnerTid(), 0); |
| 665 | exclusive_owner_.StoreRelaxed(SafeGetTid(self)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 666 | RegisterAsLocked(self); |
| 667 | AssertExclusiveHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 668 | } |
| 669 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 670 | void ReaderWriterMutex::ExclusiveUnlock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 671 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 672 | AssertExclusiveHeld(self); |
| 673 | RegisterAsUnlocked(self); |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 674 | DCHECK_NE(GetExclusiveOwnerTid(), 0); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 675 | #if ART_USE_FUTEXES |
| 676 | bool done = false; |
| 677 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 678 | int32_t cur_state = state_.LoadRelaxed(); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 679 | if (LIKELY(cur_state == -1)) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 680 | // We're no longer the owner. |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 681 | exclusive_owner_.StoreRelaxed(0); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 682 | // Change state from -1 to 0 and impose load/store ordering appropriate for lock release. |
| 683 | // Note, the relaxed loads below musn't reorder before the CompareExchange. |
| 684 | // TODO: the ordering here is non-trivial as state is split across 3 fields, fix by placing |
| 685 | // a status bit into the state on contention. |
| 686 | done = state_.CompareExchangeWeakSequentiallyConsistent(-1 /* cur_state*/, 0 /* new state */); |
| 687 | if (LIKELY(done)) { // Weak CAS may fail spuriously. |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 688 | // Wake any waiters. |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 689 | if (UNLIKELY(num_pending_readers_.LoadRelaxed() > 0 || |
| 690 | num_pending_writers_.LoadRelaxed() > 0)) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 691 | futex(state_.Address(), FUTEX_WAKE, -1, nullptr, nullptr, 0); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 692 | } |
| 693 | } |
| 694 | } else { |
| 695 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 696 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 697 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 698 | #else |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 699 | exclusive_owner_.StoreRelaxed(0); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 700 | CHECK_MUTEX_CALL(pthread_rwlock_unlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 701 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 702 | } |
| 703 | |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 704 | #if HAVE_TIMED_RWLOCK |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 705 | bool ReaderWriterMutex::ExclusiveLockWithTimeout(Thread* self, int64_t ms, int32_t ns) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 706 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 707 | #if ART_USE_FUTEXES |
| 708 | bool done = false; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 709 | timespec end_abs_ts; |
tony.ys_liu | 071e48e | 2015-01-14 18:28:03 +0800 | [diff] [blame] | 710 | InitTimeSpec(true, CLOCK_MONOTONIC, ms, ns, &end_abs_ts); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 711 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 712 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 713 | if (cur_state == 0) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 714 | // Change state from 0 to -1 and impose load/store ordering appropriate for lock acquisition. |
| 715 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state */, -1 /* new state */); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 716 | } else { |
| 717 | // Failed to acquire, hang up. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 718 | timespec now_abs_ts; |
tony.ys_liu | 071e48e | 2015-01-14 18:28:03 +0800 | [diff] [blame] | 719 | InitTimeSpec(true, CLOCK_MONOTONIC, 0, 0, &now_abs_ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 720 | timespec rel_ts; |
| 721 | if (ComputeRelativeTimeSpec(&rel_ts, end_abs_ts, now_abs_ts)) { |
| 722 | return false; // Timed out. |
| 723 | } |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 724 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 725 | ++num_pending_writers_; |
Hiroshi Yamauchi | a222404 | 2017-02-08 16:35:45 -0800 | [diff] [blame] | 726 | if (UNLIKELY(should_respond_to_empty_checkpoint_request_)) { |
| 727 | self->CheckEmptyCheckpointFromMutex(); |
| 728 | } |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 729 | if (futex(state_.Address(), FUTEX_WAIT, cur_state, &rel_ts, nullptr, 0) != 0) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 730 | if (errno == ETIMEDOUT) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 731 | --num_pending_writers_; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 732 | return false; // Timed out. |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 733 | } else if ((errno != EAGAIN) && (errno != EINTR)) { |
| 734 | // EAGAIN and EINTR both indicate a spurious failure, |
| 735 | // recompute the relative time out from now and try again. |
| 736 | // We don't use TEMP_FAILURE_RETRY so we can recompute rel_ts; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 737 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 738 | } |
| 739 | } |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 740 | --num_pending_writers_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 741 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 742 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 743 | #else |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 744 | timespec ts; |
Brian Carlstrom | bcc2926 | 2012-11-02 11:36:03 -0700 | [diff] [blame] | 745 | InitTimeSpec(true, CLOCK_REALTIME, ms, ns, &ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 746 | int result = pthread_rwlock_timedwrlock(&rwlock_, &ts); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 747 | if (result == ETIMEDOUT) { |
| 748 | return false; |
| 749 | } |
| 750 | if (result != 0) { |
| 751 | errno = result; |
Ian Rogers | a5acfd3 | 2012-08-15 11:50:10 -0700 | [diff] [blame] | 752 | PLOG(FATAL) << "pthread_rwlock_timedwrlock failed for " << name_; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 753 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 754 | #endif |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 755 | exclusive_owner_.StoreRelaxed(SafeGetTid(self)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 756 | RegisterAsLocked(self); |
| 757 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 758 | return true; |
| 759 | } |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 760 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 761 | |
Ian Rogers | 51d212e | 2014-10-23 17:48:20 -0700 | [diff] [blame] | 762 | #if ART_USE_FUTEXES |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 763 | void ReaderWriterMutex::HandleSharedLockContention(Thread* self, int32_t cur_state) { |
| 764 | // Owner holds it exclusively, hang up. |
| 765 | ScopedContentionRecorder scr(this, GetExclusiveOwnerTid(), SafeGetTid(self)); |
| 766 | ++num_pending_readers_; |
Hiroshi Yamauchi | a222404 | 2017-02-08 16:35:45 -0800 | [diff] [blame] | 767 | if (UNLIKELY(should_respond_to_empty_checkpoint_request_)) { |
| 768 | self->CheckEmptyCheckpointFromMutex(); |
| 769 | } |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 770 | if (futex(state_.Address(), FUTEX_WAIT, cur_state, nullptr, nullptr, 0) != 0) { |
Daniel Colascione | 6f4d102 | 2016-11-21 14:35:42 -0800 | [diff] [blame] | 771 | if (errno != EAGAIN && errno != EINTR) { |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 772 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 773 | } |
| 774 | } |
| 775 | --num_pending_readers_; |
| 776 | } |
Ian Rogers | 51d212e | 2014-10-23 17:48:20 -0700 | [diff] [blame] | 777 | #endif |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 778 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 779 | bool ReaderWriterMutex::SharedTryLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 780 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 781 | #if ART_USE_FUTEXES |
| 782 | bool done = false; |
| 783 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 784 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 785 | if (cur_state >= 0) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 786 | // Add as an extra reader and impose load/store ordering appropriate for lock acquisition. |
| 787 | done = state_.CompareExchangeWeakAcquire(cur_state, cur_state + 1); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 788 | } else { |
| 789 | // Owner holds it exclusively. |
| 790 | return false; |
| 791 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 792 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 793 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 794 | int result = pthread_rwlock_tryrdlock(&rwlock_); |
| 795 | if (result == EBUSY) { |
| 796 | return false; |
| 797 | } |
| 798 | if (result != 0) { |
| 799 | errno = result; |
| 800 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 801 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 802 | #endif |
| 803 | RegisterAsLocked(self); |
| 804 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 805 | return true; |
| 806 | } |
| 807 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 808 | bool ReaderWriterMutex::IsSharedHeld(const Thread* self) const { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 809 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 810 | bool result; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 811 | if (UNLIKELY(self == nullptr)) { // Handle unattached threads. |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 812 | result = IsExclusiveHeld(self); // TODO: a better best effort here. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 813 | } else { |
| 814 | result = (self->GetHeldMutex(level_) == this); |
| 815 | } |
| 816 | return result; |
| 817 | } |
| 818 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 819 | void ReaderWriterMutex::Dump(std::ostream& os) const { |
| 820 | os << name_ |
| 821 | << " level=" << static_cast<int>(level_) |
Mathieu Chartier | 5869a2c | 2014-10-08 14:26:23 -0700 | [diff] [blame] | 822 | << " owner=" << GetExclusiveOwnerTid() |
| 823 | #if ART_USE_FUTEXES |
| 824 | << " state=" << state_.LoadSequentiallyConsistent() |
| 825 | << " num_pending_writers=" << num_pending_writers_.LoadSequentiallyConsistent() |
| 826 | << " num_pending_readers=" << num_pending_readers_.LoadSequentiallyConsistent() |
| 827 | #endif |
| 828 | << " "; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 829 | DumpContention(os); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 830 | } |
| 831 | |
| 832 | std::ostream& operator<<(std::ostream& os, const ReaderWriterMutex& mu) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 833 | mu.Dump(os); |
| 834 | return os; |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 835 | } |
| 836 | |
Yu Li | eac4424 | 2015-06-29 10:50:03 +0800 | [diff] [blame] | 837 | std::ostream& operator<<(std::ostream& os, const MutatorMutex& mu) { |
| 838 | mu.Dump(os); |
| 839 | return os; |
| 840 | } |
| 841 | |
Hiroshi Yamauchi | a222404 | 2017-02-08 16:35:45 -0800 | [diff] [blame] | 842 | void ReaderWriterMutex::WakeupToRespondToEmptyCheckpoint() { |
| 843 | #if ART_USE_FUTEXES |
| 844 | // Wake up all the waiters so they will respond to the emtpy checkpoint. |
| 845 | DCHECK(should_respond_to_empty_checkpoint_request_); |
| 846 | if (UNLIKELY(num_pending_readers_.LoadRelaxed() > 0 || |
| 847 | num_pending_writers_.LoadRelaxed() > 0)) { |
| 848 | futex(state_.Address(), FUTEX_WAKE, -1, nullptr, nullptr, 0); |
| 849 | } |
| 850 | #else |
| 851 | LOG(FATAL) << "Non futex case isn't supported."; |
| 852 | #endif |
| 853 | } |
| 854 | |
Ian Rogers | 23055dc | 2013-04-18 16:29:16 -0700 | [diff] [blame] | 855 | ConditionVariable::ConditionVariable(const char* name, Mutex& guard) |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 856 | : name_(name), guard_(guard) { |
| 857 | #if ART_USE_FUTEXES |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 858 | DCHECK_EQ(0, sequence_.LoadRelaxed()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 859 | num_waiters_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 860 | #else |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 861 | pthread_condattr_t cond_attrs; |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 862 | CHECK_MUTEX_CALL(pthread_condattr_init, (&cond_attrs)); |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 863 | #if !defined(__APPLE__) |
| 864 | // Apple doesn't have CLOCK_MONOTONIC or pthread_condattr_setclock. |
Ian Rogers | 51d212e | 2014-10-23 17:48:20 -0700 | [diff] [blame] | 865 | CHECK_MUTEX_CALL(pthread_condattr_setclock, (&cond_attrs, CLOCK_MONOTONIC)); |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 866 | #endif |
| 867 | CHECK_MUTEX_CALL(pthread_cond_init, (&cond_, &cond_attrs)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 868 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 869 | } |
| 870 | |
| 871 | ConditionVariable::~ConditionVariable() { |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 872 | #if ART_USE_FUTEXES |
| 873 | if (num_waiters_!= 0) { |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 874 | bool is_safe_to_call_abort = IsSafeToCallAbortSafe(); |
| 875 | LOG(is_safe_to_call_abort ? FATAL : WARNING) |
Andreas Gampe | 3fec9ac | 2016-09-13 10:47:28 -0700 | [diff] [blame] | 876 | << "ConditionVariable::~ConditionVariable for " << name_ |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 877 | << " called with " << num_waiters_ << " waiters."; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 878 | } |
| 879 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 880 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 881 | // may still be using condition variables. |
| 882 | int rc = pthread_cond_destroy(&cond_); |
| 883 | if (rc != 0) { |
| 884 | errno = rc; |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 885 | bool is_safe_to_call_abort = IsSafeToCallAbortSafe(); |
| 886 | PLOG(is_safe_to_call_abort ? FATAL : WARNING) << "pthread_cond_destroy failed for " << name_; |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 887 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 888 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 889 | } |
| 890 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 891 | void ConditionVariable::Broadcast(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 892 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 893 | // TODO: enable below, there's a race in thread creation that causes false failures currently. |
| 894 | // guard_.AssertExclusiveHeld(self); |
Mathieu Chartier | e46cd75 | 2012-10-31 16:56:18 -0700 | [diff] [blame] | 895 | DCHECK_EQ(guard_.GetExclusiveOwnerTid(), SafeGetTid(self)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 896 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 897 | if (num_waiters_ > 0) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 898 | sequence_++; // Indicate the broadcast occurred. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 899 | bool done = false; |
| 900 | do { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 901 | int32_t cur_sequence = sequence_.LoadRelaxed(); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 902 | // Requeue waiters onto mutex. The waiter holds the contender count on the mutex high ensuring |
| 903 | // mutex unlocks will awaken the requeued waiter thread. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 904 | done = futex(sequence_.Address(), FUTEX_CMP_REQUEUE, 0, |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 905 | reinterpret_cast<const timespec*>(std::numeric_limits<int32_t>::max()), |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 906 | guard_.state_.Address(), cur_sequence) != -1; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 907 | if (!done) { |
Daniel Colascione | 6f4d102 | 2016-11-21 14:35:42 -0800 | [diff] [blame] | 908 | if (errno != EAGAIN && errno != EINTR) { |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 909 | PLOG(FATAL) << "futex cmp requeue failed for " << name_; |
| 910 | } |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 911 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 912 | } while (!done); |
| 913 | } |
| 914 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 915 | CHECK_MUTEX_CALL(pthread_cond_broadcast, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 916 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 917 | } |
| 918 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 919 | void ConditionVariable::Signal(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 920 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 921 | guard_.AssertExclusiveHeld(self); |
| 922 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 923 | if (num_waiters_ > 0) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 924 | sequence_++; // Indicate a signal occurred. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 925 | // Futex wake 1 waiter who will then come and in contend on mutex. It'd be nice to requeue them |
| 926 | // to avoid this, however, requeueing can only move all waiters. |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 927 | int num_woken = futex(sequence_.Address(), FUTEX_WAKE, 1, nullptr, nullptr, 0); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 928 | // Check something was woken or else we changed sequence_ before they had chance to wait. |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 929 | CHECK((num_woken == 0) || (num_woken == 1)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 930 | } |
| 931 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 932 | CHECK_MUTEX_CALL(pthread_cond_signal, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 933 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 934 | } |
| 935 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 936 | void ConditionVariable::Wait(Thread* self) { |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 937 | guard_.CheckSafeToWait(self); |
| 938 | WaitHoldingLocks(self); |
| 939 | } |
| 940 | |
| 941 | void ConditionVariable::WaitHoldingLocks(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 942 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 943 | guard_.AssertExclusiveHeld(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 944 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 945 | #if ART_USE_FUTEXES |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 946 | num_waiters_++; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 947 | // Ensure the Mutex is contended so that requeued threads are awoken. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 948 | guard_.num_contenders_++; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 949 | guard_.recursion_count_ = 1; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 950 | int32_t cur_sequence = sequence_.LoadRelaxed(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 951 | guard_.ExclusiveUnlock(self); |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 952 | if (futex(sequence_.Address(), FUTEX_WAIT, cur_sequence, nullptr, nullptr, 0) != 0) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 953 | // Futex failed, check it is an expected error. |
| 954 | // EAGAIN == EWOULDBLK, so we let the caller try again. |
| 955 | // EINTR implies a signal was sent to this thread. |
| 956 | if ((errno != EINTR) && (errno != EAGAIN)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 957 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 958 | } |
| 959 | } |
Mathieu Chartier | 4d87df6 | 2016-01-07 15:14:19 -0800 | [diff] [blame] | 960 | if (self != nullptr) { |
| 961 | JNIEnvExt* const env = self->GetJniEnv(); |
| 962 | if (UNLIKELY(env != nullptr && env->runtime_deleted)) { |
| 963 | CHECK(self->IsDaemon()); |
| 964 | // If the runtime has been deleted, then we cannot proceed. Just sleep forever. This may |
| 965 | // occur for user daemon threads that get a spurious wakeup. This occurs for test 132 with |
| 966 | // --host and --gdb. |
| 967 | // After we wake up, the runtime may have been shutdown, which means that this condition may |
| 968 | // have been deleted. It is not safe to retry the wait. |
| 969 | SleepForever(); |
| 970 | } |
| 971 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 972 | guard_.ExclusiveLock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 973 | CHECK_GE(num_waiters_, 0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 974 | num_waiters_--; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 975 | // We awoke and so no longer require awakes from the guard_'s unlock. |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 976 | CHECK_GE(guard_.num_contenders_.LoadRelaxed(), 0); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 977 | guard_.num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 978 | #else |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 979 | pid_t old_owner = guard_.GetExclusiveOwnerTid(); |
Hans Boehm | 04bb35a | 2017-09-19 11:01:40 -0700 | [diff] [blame] | 980 | guard_.exclusive_owner_.StoreRelaxed(0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 981 | guard_.recursion_count_ = 0; |
| 982 | CHECK_MUTEX_CALL(pthread_cond_wait, (&cond_, &guard_.mutex_)); |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 983 | guard_.exclusive_owner_.StoreRelaxed(old_owner); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 984 | #endif |
| 985 | guard_.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 986 | } |
| 987 | |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 988 | bool ConditionVariable::TimedWait(Thread* self, int64_t ms, int32_t ns) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 989 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 990 | bool timed_out = false; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 991 | guard_.AssertExclusiveHeld(self); |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 992 | guard_.CheckSafeToWait(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 993 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 994 | #if ART_USE_FUTEXES |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 995 | timespec rel_ts; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 996 | InitTimeSpec(false, CLOCK_REALTIME, ms, ns, &rel_ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 997 | num_waiters_++; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 998 | // Ensure the Mutex is contended so that requeued threads are awoken. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 999 | guard_.num_contenders_++; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 1000 | guard_.recursion_count_ = 1; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 1001 | int32_t cur_sequence = sequence_.LoadRelaxed(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 1002 | guard_.ExclusiveUnlock(self); |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 1003 | if (futex(sequence_.Address(), FUTEX_WAIT, cur_sequence, &rel_ts, nullptr, 0) != 0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 1004 | if (errno == ETIMEDOUT) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 1005 | // Timed out we're done. |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 1006 | timed_out = true; |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 1007 | } else if ((errno == EAGAIN) || (errno == EINTR)) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 1008 | // A signal or ConditionVariable::Signal/Broadcast has come in. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 1009 | } else { |
| 1010 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 1011 | } |
| 1012 | } |
| 1013 | guard_.ExclusiveLock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 1014 | CHECK_GE(num_waiters_, 0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 1015 | num_waiters_--; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 1016 | // We awoke and so no longer require awakes from the guard_'s unlock. |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 1017 | CHECK_GE(guard_.num_contenders_.LoadRelaxed(), 0); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 1018 | guard_.num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 1019 | #else |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 1020 | #if !defined(__APPLE__) |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 1021 | int clock = CLOCK_MONOTONIC; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 1022 | #else |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 1023 | int clock = CLOCK_REALTIME; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 1024 | #endif |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 1025 | pid_t old_owner = guard_.GetExclusiveOwnerTid(); |
| 1026 | guard_.exclusive_owner_.StoreRelaxed(0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 1027 | guard_.recursion_count_ = 0; |
| 1028 | timespec ts; |
Brian Carlstrom | bcc2926 | 2012-11-02 11:36:03 -0700 | [diff] [blame] | 1029 | InitTimeSpec(true, clock, ms, ns, &ts); |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 1030 | int rc = TEMP_FAILURE_RETRY(pthread_cond_timedwait(&cond_, &guard_.mutex_, &ts)); |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 1031 | if (rc == ETIMEDOUT) { |
| 1032 | timed_out = true; |
| 1033 | } else if (rc != 0) { |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 1034 | errno = rc; |
| 1035 | PLOG(FATAL) << "TimedWait failed for " << name_; |
| 1036 | } |
Hans Boehm | 0882af2 | 2017-08-31 15:21:57 -0700 | [diff] [blame] | 1037 | guard_.exclusive_owner_.StoreRelaxed(old_owner); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 1038 | #endif |
| 1039 | guard_.recursion_count_ = old_recursion_count; |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 1040 | return timed_out; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 1041 | } |
| 1042 | |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1043 | void Locks::Init() { |
| 1044 | if (logging_lock_ != nullptr) { |
| 1045 | // Already initialized. |
Vladimir Marko | 33bff25 | 2017-11-01 14:35:42 +0000 | [diff] [blame] | 1046 | if (kRuntimeISA == InstructionSet::kX86 || kRuntimeISA == InstructionSet::kX86_64) { |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1047 | DCHECK(modify_ldt_lock_ != nullptr); |
| 1048 | } else { |
| 1049 | DCHECK(modify_ldt_lock_ == nullptr); |
| 1050 | } |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1051 | DCHECK(abort_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 1052 | DCHECK(alloc_tracker_lock_ != nullptr); |
Andreas Gampe | 7424081 | 2014-04-17 10:35:09 -0700 | [diff] [blame] | 1053 | DCHECK(allocated_monitor_ids_lock_ != nullptr); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1054 | DCHECK(allocated_thread_ids_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1055 | DCHECK(breakpoint_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1056 | DCHECK(classlinker_classes_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 1057 | DCHECK(deoptimization_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1058 | DCHECK(heap_bitmap_lock_ != nullptr); |
Mathieu Chartier | f9c6fc6 | 2015-10-07 11:44:05 -0700 | [diff] [blame] | 1059 | DCHECK(oat_file_manager_lock_ != nullptr); |
David Brazdil | ca3c8c3 | 2016-09-06 14:04:48 +0100 | [diff] [blame] | 1060 | DCHECK(verifier_deps_lock_ != nullptr); |
Richard Uhler | a206c74 | 2016-05-24 15:04:22 -0700 | [diff] [blame] | 1061 | DCHECK(host_dlopen_handles_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 1062 | DCHECK(intern_table_lock_ != nullptr); |
Andreas Gampe | c808954 | 2017-01-16 12:41:12 -0800 | [diff] [blame] | 1063 | DCHECK(jni_function_table_lock_ != nullptr); |
Ian Rogers | 68d8b42 | 2014-07-17 11:09:10 -0700 | [diff] [blame] | 1064 | DCHECK(jni_libraries_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1065 | DCHECK(logging_lock_ != nullptr); |
| 1066 | DCHECK(mutator_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 1067 | DCHECK(profiler_lock_ != nullptr); |
Mingyao Yang | 063fc77 | 2016-08-02 11:02:54 -0700 | [diff] [blame] | 1068 | DCHECK(cha_lock_ != nullptr); |
Igor Murashkin | 495e783 | 2017-10-27 10:56:20 -0700 | [diff] [blame] | 1069 | DCHECK(subtype_check_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1070 | DCHECK(thread_list_lock_ != nullptr); |
| 1071 | DCHECK(thread_suspend_count_lock_ != nullptr); |
| 1072 | DCHECK(trace_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1073 | DCHECK(unexpected_signal_lock_ != nullptr); |
Alex Light | 88fd720 | 2017-06-30 08:31:59 -0700 | [diff] [blame] | 1074 | DCHECK(user_code_suspension_lock_ != nullptr); |
Andreas Gampe | cc1b535 | 2016-12-01 16:58:38 -0800 | [diff] [blame] | 1075 | DCHECK(dex_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1076 | } else { |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1077 | // Create global locks in level order from highest lock level to lowest. |
Ian Rogers | 4ad5cd3 | 2014-11-11 23:08:07 -0800 | [diff] [blame] | 1078 | LockLevel current_lock_level = kInstrumentEntrypointsLock; |
| 1079 | DCHECK(instrument_entrypoints_lock_ == nullptr); |
| 1080 | instrument_entrypoints_lock_ = new Mutex("instrument entrypoint lock", current_lock_level); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1081 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1082 | #define UPDATE_CURRENT_LOCK_LEVEL(new_level) \ |
Chih-Hung Hsieh | fba3997 | 2016-05-11 11:26:48 -0700 | [diff] [blame] | 1083 | if ((new_level) >= current_lock_level) { \ |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 1084 | /* Do not use CHECKs or FATAL here, abort_lock_ is not setup yet. */ \ |
| 1085 | fprintf(stderr, "New local level %d is not less than current level %d\n", \ |
| 1086 | new_level, current_lock_level); \ |
| 1087 | exit(1); \ |
| 1088 | } \ |
Ian Rogers | f3d874c | 2014-07-17 18:52:42 -0700 | [diff] [blame] | 1089 | current_lock_level = new_level; |
| 1090 | |
Alex Light | 88fd720 | 2017-06-30 08:31:59 -0700 | [diff] [blame] | 1091 | UPDATE_CURRENT_LOCK_LEVEL(kUserCodeSuspensionLock); |
| 1092 | DCHECK(user_code_suspension_lock_ == nullptr); |
| 1093 | user_code_suspension_lock_ = new Mutex("user code suspension lock", current_lock_level); |
| 1094 | |
Ian Rogers | f3d874c | 2014-07-17 18:52:42 -0700 | [diff] [blame] | 1095 | UPDATE_CURRENT_LOCK_LEVEL(kMutatorLock); |
| 1096 | DCHECK(mutator_lock_ == nullptr); |
Yu Li | eac4424 | 2015-06-29 10:50:03 +0800 | [diff] [blame] | 1097 | mutator_lock_ = new MutatorMutex("mutator lock", current_lock_level); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1098 | |
| 1099 | UPDATE_CURRENT_LOCK_LEVEL(kHeapBitmapLock); |
| 1100 | DCHECK(heap_bitmap_lock_ == nullptr); |
| 1101 | heap_bitmap_lock_ = new ReaderWriterMutex("heap bitmap lock", current_lock_level); |
| 1102 | |
Jeff Hao | 69dbec6 | 2014-09-15 18:03:41 -0700 | [diff] [blame] | 1103 | UPDATE_CURRENT_LOCK_LEVEL(kTraceLock); |
| 1104 | DCHECK(trace_lock_ == nullptr); |
| 1105 | trace_lock_ = new Mutex("trace lock", current_lock_level); |
| 1106 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1107 | UPDATE_CURRENT_LOCK_LEVEL(kRuntimeShutdownLock); |
| 1108 | DCHECK(runtime_shutdown_lock_ == nullptr); |
| 1109 | runtime_shutdown_lock_ = new Mutex("runtime shutdown lock", current_lock_level); |
| 1110 | |
| 1111 | UPDATE_CURRENT_LOCK_LEVEL(kProfilerLock); |
| 1112 | DCHECK(profiler_lock_ == nullptr); |
| 1113 | profiler_lock_ = new Mutex("profiler lock", current_lock_level); |
| 1114 | |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 1115 | UPDATE_CURRENT_LOCK_LEVEL(kDeoptimizationLock); |
| 1116 | DCHECK(deoptimization_lock_ == nullptr); |
| 1117 | deoptimization_lock_ = new Mutex("Deoptimization lock", current_lock_level); |
| 1118 | |
| 1119 | UPDATE_CURRENT_LOCK_LEVEL(kAllocTrackerLock); |
| 1120 | DCHECK(alloc_tracker_lock_ == nullptr); |
| 1121 | alloc_tracker_lock_ = new Mutex("AllocTracker lock", current_lock_level); |
| 1122 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1123 | UPDATE_CURRENT_LOCK_LEVEL(kThreadListLock); |
| 1124 | DCHECK(thread_list_lock_ == nullptr); |
| 1125 | thread_list_lock_ = new Mutex("thread list lock", current_lock_level); |
| 1126 | |
Ian Rogers | 68d8b42 | 2014-07-17 11:09:10 -0700 | [diff] [blame] | 1127 | UPDATE_CURRENT_LOCK_LEVEL(kJniLoadLibraryLock); |
| 1128 | DCHECK(jni_libraries_lock_ == nullptr); |
| 1129 | jni_libraries_lock_ = new Mutex("JNI shared libraries map lock", current_lock_level); |
| 1130 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1131 | UPDATE_CURRENT_LOCK_LEVEL(kBreakpointLock); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1132 | DCHECK(breakpoint_lock_ == nullptr); |
Sebastien Hertz | ed2be17 | 2014-08-19 15:33:43 +0200 | [diff] [blame] | 1133 | breakpoint_lock_ = new ReaderWriterMutex("breakpoint lock", current_lock_level); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1134 | |
Igor Murashkin | 495e783 | 2017-10-27 10:56:20 -0700 | [diff] [blame] | 1135 | UPDATE_CURRENT_LOCK_LEVEL(kSubtypeCheckLock); |
| 1136 | DCHECK(subtype_check_lock_ == nullptr); |
| 1137 | subtype_check_lock_ = new Mutex("SubtypeCheck lock", current_lock_level); |
| 1138 | |
Mingyao Yang | 063fc77 | 2016-08-02 11:02:54 -0700 | [diff] [blame] | 1139 | UPDATE_CURRENT_LOCK_LEVEL(kCHALock); |
| 1140 | DCHECK(cha_lock_ == nullptr); |
| 1141 | cha_lock_ = new Mutex("CHA lock", current_lock_level); |
| 1142 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1143 | UPDATE_CURRENT_LOCK_LEVEL(kClassLinkerClassesLock); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1144 | DCHECK(classlinker_classes_lock_ == nullptr); |
| 1145 | classlinker_classes_lock_ = new ReaderWriterMutex("ClassLinker classes lock", |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1146 | current_lock_level); |
| 1147 | |
Andreas Gampe | 7424081 | 2014-04-17 10:35:09 -0700 | [diff] [blame] | 1148 | UPDATE_CURRENT_LOCK_LEVEL(kMonitorPoolLock); |
| 1149 | DCHECK(allocated_monitor_ids_lock_ == nullptr); |
| 1150 | allocated_monitor_ids_lock_ = new Mutex("allocated monitor ids lock", current_lock_level); |
| 1151 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1152 | UPDATE_CURRENT_LOCK_LEVEL(kAllocatedThreadIdsLock); |
| 1153 | DCHECK(allocated_thread_ids_lock_ == nullptr); |
| 1154 | allocated_thread_ids_lock_ = new Mutex("allocated thread ids lock", current_lock_level); |
| 1155 | |
Vladimir Marko | 33bff25 | 2017-11-01 14:35:42 +0000 | [diff] [blame] | 1156 | if (kRuntimeISA == InstructionSet::kX86 || kRuntimeISA == InstructionSet::kX86_64) { |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1157 | UPDATE_CURRENT_LOCK_LEVEL(kModifyLdtLock); |
| 1158 | DCHECK(modify_ldt_lock_ == nullptr); |
| 1159 | modify_ldt_lock_ = new Mutex("modify_ldt lock", current_lock_level); |
| 1160 | } |
| 1161 | |
Andreas Gampe | cc1b535 | 2016-12-01 16:58:38 -0800 | [diff] [blame] | 1162 | UPDATE_CURRENT_LOCK_LEVEL(kDexLock); |
| 1163 | DCHECK(dex_lock_ == nullptr); |
| 1164 | dex_lock_ = new ReaderWriterMutex("ClassLinker dex lock", current_lock_level); |
| 1165 | |
Mathieu Chartier | f9c6fc6 | 2015-10-07 11:44:05 -0700 | [diff] [blame] | 1166 | UPDATE_CURRENT_LOCK_LEVEL(kOatFileManagerLock); |
| 1167 | DCHECK(oat_file_manager_lock_ == nullptr); |
| 1168 | oat_file_manager_lock_ = new ReaderWriterMutex("OatFile manager lock", current_lock_level); |
| 1169 | |
David Brazdil | ca3c8c3 | 2016-09-06 14:04:48 +0100 | [diff] [blame] | 1170 | UPDATE_CURRENT_LOCK_LEVEL(kVerifierDepsLock); |
| 1171 | DCHECK(verifier_deps_lock_ == nullptr); |
Nicolas Geoffray | 340dafa | 2016-11-18 16:03:10 +0000 | [diff] [blame] | 1172 | verifier_deps_lock_ = new ReaderWriterMutex("verifier deps lock", current_lock_level); |
David Brazdil | ca3c8c3 | 2016-09-06 14:04:48 +0100 | [diff] [blame] | 1173 | |
Richard Uhler | a206c74 | 2016-05-24 15:04:22 -0700 | [diff] [blame] | 1174 | UPDATE_CURRENT_LOCK_LEVEL(kHostDlOpenHandlesLock); |
| 1175 | DCHECK(host_dlopen_handles_lock_ == nullptr); |
| 1176 | host_dlopen_handles_lock_ = new Mutex("host dlopen handles lock", current_lock_level); |
Mathieu Chartier | e58991b | 2015-10-13 07:59:34 -0700 | [diff] [blame] | 1177 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1178 | UPDATE_CURRENT_LOCK_LEVEL(kInternTableLock); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1179 | DCHECK(intern_table_lock_ == nullptr); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1180 | intern_table_lock_ = new Mutex("InternTable lock", current_lock_level); |
| 1181 | |
Mathieu Chartier | a5a53ef | 2014-09-12 12:58:05 -0700 | [diff] [blame] | 1182 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceProcessorLock); |
| 1183 | DCHECK(reference_processor_lock_ == nullptr); |
| 1184 | reference_processor_lock_ = new Mutex("ReferenceProcessor lock", current_lock_level); |
| 1185 | |
| 1186 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueClearedReferencesLock); |
| 1187 | DCHECK(reference_queue_cleared_references_lock_ == nullptr); |
| 1188 | reference_queue_cleared_references_lock_ = new Mutex("ReferenceQueue cleared references lock", current_lock_level); |
| 1189 | |
| 1190 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueWeakReferencesLock); |
| 1191 | DCHECK(reference_queue_weak_references_lock_ == nullptr); |
| 1192 | reference_queue_weak_references_lock_ = new Mutex("ReferenceQueue cleared references lock", current_lock_level); |
| 1193 | |
| 1194 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueFinalizerReferencesLock); |
| 1195 | DCHECK(reference_queue_finalizer_references_lock_ == nullptr); |
| 1196 | reference_queue_finalizer_references_lock_ = new Mutex("ReferenceQueue finalizer references lock", current_lock_level); |
| 1197 | |
| 1198 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueuePhantomReferencesLock); |
| 1199 | DCHECK(reference_queue_phantom_references_lock_ == nullptr); |
| 1200 | reference_queue_phantom_references_lock_ = new Mutex("ReferenceQueue phantom references lock", current_lock_level); |
| 1201 | |
| 1202 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueSoftReferencesLock); |
| 1203 | DCHECK(reference_queue_soft_references_lock_ == nullptr); |
| 1204 | reference_queue_soft_references_lock_ = new Mutex("ReferenceQueue soft references lock", current_lock_level); |
| 1205 | |
Andreas Gampe | 05a364c | 2016-10-14 13:27:12 -0700 | [diff] [blame] | 1206 | UPDATE_CURRENT_LOCK_LEVEL(kJniGlobalsLock); |
| 1207 | DCHECK(jni_globals_lock_ == nullptr); |
| 1208 | jni_globals_lock_ = |
| 1209 | new ReaderWriterMutex("JNI global reference table lock", current_lock_level); |
| 1210 | |
| 1211 | UPDATE_CURRENT_LOCK_LEVEL(kJniWeakGlobalsLock); |
| 1212 | DCHECK(jni_weak_globals_lock_ == nullptr); |
| 1213 | jni_weak_globals_lock_ = new Mutex("JNI weak global reference table lock", current_lock_level); |
| 1214 | |
Andreas Gampe | c808954 | 2017-01-16 12:41:12 -0800 | [diff] [blame] | 1215 | UPDATE_CURRENT_LOCK_LEVEL(kJniFunctionTableLock); |
| 1216 | DCHECK(jni_function_table_lock_ == nullptr); |
| 1217 | jni_function_table_lock_ = new Mutex("JNI function table lock", current_lock_level); |
| 1218 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1219 | UPDATE_CURRENT_LOCK_LEVEL(kAbortLock); |
| 1220 | DCHECK(abort_lock_ == nullptr); |
| 1221 | abort_lock_ = new Mutex("abort lock", current_lock_level, true); |
| 1222 | |
| 1223 | UPDATE_CURRENT_LOCK_LEVEL(kThreadSuspendCountLock); |
| 1224 | DCHECK(thread_suspend_count_lock_ == nullptr); |
| 1225 | thread_suspend_count_lock_ = new Mutex("thread suspend count lock", current_lock_level); |
| 1226 | |
| 1227 | UPDATE_CURRENT_LOCK_LEVEL(kUnexpectedSignalLock); |
| 1228 | DCHECK(unexpected_signal_lock_ == nullptr); |
| 1229 | unexpected_signal_lock_ = new Mutex("unexpected signal lock", current_lock_level, true); |
| 1230 | |
| 1231 | UPDATE_CURRENT_LOCK_LEVEL(kLoggingLock); |
| 1232 | DCHECK(logging_lock_ == nullptr); |
| 1233 | logging_lock_ = new Mutex("logging lock", current_lock_level, true); |
| 1234 | |
| 1235 | #undef UPDATE_CURRENT_LOCK_LEVEL |
Mathieu Chartier | 91e5669 | 2015-03-03 13:51:04 -0800 | [diff] [blame] | 1236 | |
Hiroshi Yamauchi | a222404 | 2017-02-08 16:35:45 -0800 | [diff] [blame] | 1237 | // List of mutexes that we may hold when accessing a weak ref. |
Hiroshi Yamauchi | 8a43324 | 2017-03-07 14:39:22 -0800 | [diff] [blame] | 1238 | AddToExpectedMutexesOnWeakRefAccess(dex_lock_, /*need_lock*/ false); |
| 1239 | AddToExpectedMutexesOnWeakRefAccess(classlinker_classes_lock_, /*need_lock*/ false); |
| 1240 | AddToExpectedMutexesOnWeakRefAccess(jni_libraries_lock_, /*need_lock*/ false); |
Hiroshi Yamauchi | a222404 | 2017-02-08 16:35:45 -0800 | [diff] [blame] | 1241 | |
Mathieu Chartier | 91e5669 | 2015-03-03 13:51:04 -0800 | [diff] [blame] | 1242 | InitConditions(); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1243 | } |
| 1244 | } |
| 1245 | |
Mathieu Chartier | 91e5669 | 2015-03-03 13:51:04 -0800 | [diff] [blame] | 1246 | void Locks::InitConditions() { |
| 1247 | thread_exit_cond_ = new ConditionVariable("thread exit condition variable", *thread_list_lock_); |
| 1248 | } |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1249 | |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 1250 | void Locks::SetClientCallback(ClientCallback* safe_to_call_abort_cb) { |
| 1251 | safe_to_call_abort_callback.StoreRelease(safe_to_call_abort_cb); |
| 1252 | } |
| 1253 | |
| 1254 | // Helper to allow checking shutdown while ignoring locking requirements. |
| 1255 | bool Locks::IsSafeToCallAbortRacy() { |
| 1256 | Locks::ClientCallback* safe_to_call_abort_cb = safe_to_call_abort_callback.LoadAcquire(); |
| 1257 | return safe_to_call_abort_cb != nullptr && safe_to_call_abort_cb(); |
| 1258 | } |
| 1259 | |
Hiroshi Yamauchi | 8a43324 | 2017-03-07 14:39:22 -0800 | [diff] [blame] | 1260 | void Locks::AddToExpectedMutexesOnWeakRefAccess(BaseMutex* mutex, bool need_lock) { |
| 1261 | if (need_lock) { |
| 1262 | ScopedExpectedMutexesOnWeakRefAccessLock mu(mutex); |
| 1263 | mutex->SetShouldRespondToEmptyCheckpointRequest(true); |
| 1264 | expected_mutexes_on_weak_ref_access_.push_back(mutex); |
| 1265 | } else { |
| 1266 | mutex->SetShouldRespondToEmptyCheckpointRequest(true); |
| 1267 | expected_mutexes_on_weak_ref_access_.push_back(mutex); |
| 1268 | } |
| 1269 | } |
| 1270 | |
| 1271 | void Locks::RemoveFromExpectedMutexesOnWeakRefAccess(BaseMutex* mutex, bool need_lock) { |
| 1272 | if (need_lock) { |
| 1273 | ScopedExpectedMutexesOnWeakRefAccessLock mu(mutex); |
| 1274 | mutex->SetShouldRespondToEmptyCheckpointRequest(false); |
| 1275 | std::vector<BaseMutex*>& list = expected_mutexes_on_weak_ref_access_; |
| 1276 | auto it = std::find(list.begin(), list.end(), mutex); |
| 1277 | DCHECK(it != list.end()); |
| 1278 | list.erase(it); |
| 1279 | } else { |
| 1280 | mutex->SetShouldRespondToEmptyCheckpointRequest(false); |
| 1281 | std::vector<BaseMutex*>& list = expected_mutexes_on_weak_ref_access_; |
| 1282 | auto it = std::find(list.begin(), list.end(), mutex); |
| 1283 | DCHECK(it != list.end()); |
| 1284 | list.erase(it); |
| 1285 | } |
| 1286 | } |
| 1287 | |
| 1288 | bool Locks::IsExpectedOnWeakRefAccess(BaseMutex* mutex) { |
| 1289 | ScopedExpectedMutexesOnWeakRefAccessLock mu(mutex); |
| 1290 | std::vector<BaseMutex*>& list = expected_mutexes_on_weak_ref_access_; |
| 1291 | return std::find(list.begin(), list.end(), mutex) != list.end(); |
| 1292 | } |
| 1293 | |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 1294 | } // namespace art |