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" |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 26 | #include "base/time_utils.h" |
Mathieu Chartier | 32ce2ad | 2016-03-04 14:58:03 -0800 | [diff] [blame] | 27 | #include "base/systrace.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; |
Ian Rogers | 68d8b42 | 2014-07-17 11:09:10 -0700 | [diff] [blame] | 49 | Mutex* Locks::jni_libraries_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 50 | Mutex* Locks::logging_lock_ = nullptr; |
Hiroshi Yamauchi | 3eed93d | 2014-06-04 11:43:59 -0700 | [diff] [blame] | 51 | Mutex* Locks::mem_maps_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; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 66 | Mutex* Locks::thread_list_lock_ = nullptr; |
Mathieu Chartier | 91e5669 | 2015-03-03 13:51:04 -0800 | [diff] [blame] | 67 | ConditionVariable* Locks::thread_exit_cond_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 68 | Mutex* Locks::thread_suspend_count_lock_ = nullptr; |
| 69 | Mutex* Locks::trace_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 70 | Mutex* Locks::unexpected_signal_lock_ = nullptr; |
Andreas Gampe | 5bdb655 | 2015-07-22 23:44:55 -0700 | [diff] [blame] | 71 | Uninterruptible Roles::uninterruptible_; |
Andreas Gampe | 05a364c | 2016-10-14 13:27:12 -0700 | [diff] [blame] | 72 | ReaderWriterMutex* Locks::jni_globals_lock_ = nullptr; |
| 73 | Mutex* Locks::jni_weak_globals_lock_ = nullptr; |
Andreas Gampe | cc1b535 | 2016-12-01 16:58:38 -0800 | [diff] [blame] | 74 | ReaderWriterMutex* Locks::dex_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 75 | |
| 76 | struct AllMutexData { |
| 77 | // A guard for all_mutexes_ that's not a mutex (Mutexes must CAS to acquire and busy wait). |
| 78 | Atomic<const BaseMutex*> all_mutexes_guard; |
| 79 | // All created mutexes guarded by all_mutexes_guard_. |
| 80 | std::set<BaseMutex*>* all_mutexes; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 81 | AllMutexData() : all_mutexes(nullptr) {} |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 82 | }; |
| 83 | static struct AllMutexData gAllMutexData[kAllMutexDataSize]; |
| 84 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 85 | #if ART_USE_FUTEXES |
| 86 | static bool ComputeRelativeTimeSpec(timespec* result_ts, const timespec& lhs, const timespec& rhs) { |
Brian Carlstrom | fb6996f | 2013-07-18 18:21:14 -0700 | [diff] [blame] | 87 | const int32_t one_sec = 1000 * 1000 * 1000; // one second in nanoseconds. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 88 | result_ts->tv_sec = lhs.tv_sec - rhs.tv_sec; |
| 89 | result_ts->tv_nsec = lhs.tv_nsec - rhs.tv_nsec; |
| 90 | if (result_ts->tv_nsec < 0) { |
| 91 | result_ts->tv_sec--; |
| 92 | result_ts->tv_nsec += one_sec; |
| 93 | } else if (result_ts->tv_nsec > one_sec) { |
| 94 | result_ts->tv_sec++; |
| 95 | result_ts->tv_nsec -= one_sec; |
| 96 | } |
| 97 | return result_ts->tv_sec < 0; |
| 98 | } |
| 99 | #endif |
| 100 | |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 101 | class ScopedAllMutexesLock FINAL { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 102 | public: |
Brian Carlstrom | 93ba893 | 2013-07-17 21:31:49 -0700 | [diff] [blame] | 103 | explicit ScopedAllMutexesLock(const BaseMutex* mutex) : mutex_(mutex) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 104 | while (!gAllMutexData->all_mutexes_guard.CompareExchangeWeakAcquire(0, mutex)) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 105 | NanoSleep(100); |
| 106 | } |
| 107 | } |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 108 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 109 | ~ScopedAllMutexesLock() { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 110 | while (!gAllMutexData->all_mutexes_guard.CompareExchangeWeakRelease(mutex_, 0)) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 111 | NanoSleep(100); |
| 112 | } |
| 113 | } |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 114 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 115 | private: |
| 116 | const BaseMutex* const mutex_; |
| 117 | }; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 118 | |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 119 | // Scoped class that generates events at the beginning and end of lock contention. |
| 120 | class ScopedContentionRecorder FINAL : public ValueObject { |
| 121 | public: |
| 122 | ScopedContentionRecorder(BaseMutex* mutex, uint64_t blocked_tid, uint64_t owner_tid) |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 123 | : mutex_(kLogLockContentions ? mutex : nullptr), |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 124 | blocked_tid_(kLogLockContentions ? blocked_tid : 0), |
| 125 | owner_tid_(kLogLockContentions ? owner_tid : 0), |
| 126 | start_nano_time_(kLogLockContentions ? NanoTime() : 0) { |
| 127 | if (ATRACE_ENABLED()) { |
| 128 | std::string msg = StringPrintf("Lock contention on %s (owner tid: %" PRIu64 ")", |
| 129 | mutex->GetName(), owner_tid); |
| 130 | ATRACE_BEGIN(msg.c_str()); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | ~ScopedContentionRecorder() { |
| 135 | ATRACE_END(); |
| 136 | if (kLogLockContentions) { |
| 137 | uint64_t end_nano_time = NanoTime(); |
| 138 | mutex_->RecordContention(blocked_tid_, owner_tid_, end_nano_time - start_nano_time_); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | private: |
| 143 | BaseMutex* const mutex_; |
| 144 | const uint64_t blocked_tid_; |
| 145 | const uint64_t owner_tid_; |
| 146 | const uint64_t start_nano_time_; |
| 147 | }; |
| 148 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 149 | BaseMutex::BaseMutex(const char* name, LockLevel level) : level_(level), name_(name) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 150 | if (kLogLockContentions) { |
| 151 | ScopedAllMutexesLock mu(this); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 152 | std::set<BaseMutex*>** all_mutexes_ptr = &gAllMutexData->all_mutexes; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 153 | if (*all_mutexes_ptr == nullptr) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 154 | // We leak the global set of all mutexes to avoid ordering issues in global variable |
| 155 | // construction/destruction. |
| 156 | *all_mutexes_ptr = new std::set<BaseMutex*>(); |
| 157 | } |
| 158 | (*all_mutexes_ptr)->insert(this); |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 159 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | BaseMutex::~BaseMutex() { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 163 | if (kLogLockContentions) { |
| 164 | ScopedAllMutexesLock mu(this); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 165 | gAllMutexData->all_mutexes->erase(this); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 166 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | void BaseMutex::DumpAll(std::ostream& os) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 170 | if (kLogLockContentions) { |
| 171 | os << "Mutex logging:\n"; |
| 172 | ScopedAllMutexesLock mu(reinterpret_cast<const BaseMutex*>(-1)); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 173 | std::set<BaseMutex*>* all_mutexes = gAllMutexData->all_mutexes; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 174 | if (all_mutexes == nullptr) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 175 | // No mutexes have been created yet during at startup. |
| 176 | return; |
| 177 | } |
| 178 | typedef std::set<BaseMutex*>::const_iterator It; |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 179 | os << "(Contended)\n"; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 180 | for (It it = all_mutexes->begin(); it != all_mutexes->end(); ++it) { |
| 181 | BaseMutex* mutex = *it; |
| 182 | if (mutex->HasEverContended()) { |
| 183 | mutex->Dump(os); |
| 184 | os << "\n"; |
| 185 | } |
| 186 | } |
| 187 | os << "(Never contented)\n"; |
| 188 | for (It it = all_mutexes->begin(); it != all_mutexes->end(); ++it) { |
| 189 | BaseMutex* mutex = *it; |
| 190 | if (!mutex->HasEverContended()) { |
| 191 | mutex->Dump(os); |
| 192 | os << "\n"; |
| 193 | } |
| 194 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 195 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 196 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 197 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 198 | void BaseMutex::CheckSafeToWait(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 199 | if (self == nullptr) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 200 | CheckUnattachedThread(level_); |
| 201 | return; |
| 202 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 203 | if (kDebugLocking) { |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 204 | CHECK(self->GetHeldMutex(level_) == this || level_ == kMonitorLock) |
| 205 | << "Waiting on unacquired mutex: " << name_; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 206 | bool bad_mutexes_held = false; |
Elliott Hughes | 0f82716 | 2013-02-26 12:12:58 -0800 | [diff] [blame] | 207 | for (int i = kLockLevelCount - 1; i >= 0; --i) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 208 | if (i != level_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 209 | BaseMutex* held_mutex = self->GetHeldMutex(static_cast<LockLevel>(i)); |
Ian Rogers | f3d874c | 2014-07-17 18:52:42 -0700 | [diff] [blame] | 210 | // We expect waits to happen while holding the thread list suspend thread lock. |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 211 | if (held_mutex != nullptr) { |
Elliott Hughes | 0f82716 | 2013-02-26 12:12:58 -0800 | [diff] [blame] | 212 | LOG(ERROR) << "Holding \"" << held_mutex->name_ << "\" " |
| 213 | << "(level " << LockLevel(i) << ") while performing wait on " |
| 214 | << "\"" << name_ << "\" (level " << level_ << ")"; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 215 | bad_mutexes_held = true; |
| 216 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 217 | } |
| 218 | } |
Nicolas Geoffray | db97871 | 2014-12-09 13:33:38 +0000 | [diff] [blame] | 219 | if (gAborting == 0) { // Avoid recursive aborts. |
| 220 | CHECK(!bad_mutexes_held); |
| 221 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 222 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 223 | } |
| 224 | |
Ian Rogers | 37f3c96 | 2014-07-17 11:25:30 -0700 | [diff] [blame] | 225 | void BaseMutex::ContentionLogData::AddToWaitTime(uint64_t value) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 226 | if (kLogLockContentions) { |
| 227 | // Atomically add value to wait_time. |
Ian Rogers | 37f3c96 | 2014-07-17 11:25:30 -0700 | [diff] [blame] | 228 | wait_time.FetchAndAddSequentiallyConsistent(value); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 229 | } |
| 230 | } |
| 231 | |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 232 | void BaseMutex::RecordContention(uint64_t blocked_tid, |
| 233 | uint64_t owner_tid, |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 234 | uint64_t nano_time_blocked) { |
| 235 | if (kLogLockContentions) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 236 | ContentionLogData* data = contention_log_data_; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 237 | ++(data->contention_count); |
| 238 | data->AddToWaitTime(nano_time_blocked); |
| 239 | ContentionLogEntry* log = data->contention_log; |
| 240 | // This code is intentionally racy as it is only used for diagnostics. |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 241 | uint32_t slot = data->cur_content_log_entry.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 242 | if (log[slot].blocked_tid == blocked_tid && |
| 243 | log[slot].owner_tid == blocked_tid) { |
| 244 | ++log[slot].count; |
| 245 | } else { |
| 246 | uint32_t new_slot; |
| 247 | do { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 248 | slot = data->cur_content_log_entry.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 249 | new_slot = (slot + 1) % kContentionLogSize; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 250 | } while (!data->cur_content_log_entry.CompareExchangeWeakRelaxed(slot, new_slot)); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 251 | log[new_slot].blocked_tid = blocked_tid; |
| 252 | log[new_slot].owner_tid = owner_tid; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 253 | log[new_slot].count.StoreRelaxed(1); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 254 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 255 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 256 | } |
| 257 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 258 | void BaseMutex::DumpContention(std::ostream& os) const { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 259 | if (kLogLockContentions) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 260 | const ContentionLogData* data = contention_log_data_; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 261 | const ContentionLogEntry* log = data->contention_log; |
Ian Rogers | 37f3c96 | 2014-07-17 11:25:30 -0700 | [diff] [blame] | 262 | uint64_t wait_time = data->wait_time.LoadRelaxed(); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 263 | uint32_t contention_count = data->contention_count.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 264 | if (contention_count == 0) { |
| 265 | os << "never contended"; |
| 266 | } else { |
| 267 | os << "contended " << contention_count |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 268 | << " total wait of contender " << PrettyDuration(wait_time) |
| 269 | << " average " << PrettyDuration(wait_time / contention_count); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 270 | SafeMap<uint64_t, size_t> most_common_blocker; |
| 271 | SafeMap<uint64_t, size_t> most_common_blocked; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 272 | for (size_t i = 0; i < kContentionLogSize; ++i) { |
| 273 | uint64_t blocked_tid = log[i].blocked_tid; |
| 274 | uint64_t owner_tid = log[i].owner_tid; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 275 | uint32_t count = log[i].count.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 276 | if (count > 0) { |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 277 | auto it = most_common_blocked.find(blocked_tid); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 278 | if (it != most_common_blocked.end()) { |
| 279 | most_common_blocked.Overwrite(blocked_tid, it->second + count); |
| 280 | } else { |
| 281 | most_common_blocked.Put(blocked_tid, count); |
| 282 | } |
| 283 | it = most_common_blocker.find(owner_tid); |
| 284 | if (it != most_common_blocker.end()) { |
| 285 | most_common_blocker.Overwrite(owner_tid, it->second + count); |
| 286 | } else { |
| 287 | most_common_blocker.Put(owner_tid, count); |
| 288 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 289 | } |
| 290 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 291 | uint64_t max_tid = 0; |
| 292 | size_t max_tid_count = 0; |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 293 | for (const auto& pair : most_common_blocked) { |
| 294 | if (pair.second > max_tid_count) { |
| 295 | max_tid = pair.first; |
| 296 | max_tid_count = pair.second; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 297 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 298 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 299 | if (max_tid != 0) { |
| 300 | os << " sample shows most blocked tid=" << max_tid; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 301 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 302 | max_tid = 0; |
| 303 | max_tid_count = 0; |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 304 | for (const auto& pair : most_common_blocker) { |
| 305 | if (pair.second > max_tid_count) { |
| 306 | max_tid = pair.first; |
| 307 | max_tid_count = pair.second; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 308 | } |
| 309 | } |
| 310 | if (max_tid != 0) { |
| 311 | os << " sample shows tid=" << max_tid << " owning during this time"; |
| 312 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 313 | } |
| 314 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 318 | Mutex::Mutex(const char* name, LockLevel level, bool recursive) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 319 | : BaseMutex(name, level), recursive_(recursive), recursion_count_(0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 320 | #if ART_USE_FUTEXES |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 321 | DCHECK_EQ(0, state_.LoadRelaxed()); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 322 | DCHECK_EQ(0, num_contenders_.LoadRelaxed()); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 323 | #else |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 324 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, nullptr)); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 325 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 326 | exclusive_owner_ = 0; |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 327 | } |
| 328 | |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 329 | // Helper to allow checking shutdown while locking for thread safety. |
| 330 | static bool IsSafeToCallAbortSafe() { |
| 331 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
| 332 | return Locks::IsSafeToCallAbortRacy(); |
Andreas Gampe | 8f1fa10 | 2015-01-22 19:48:51 -0800 | [diff] [blame] | 333 | } |
| 334 | |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 335 | Mutex::~Mutex() { |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 336 | bool safe_to_call_abort = Locks::IsSafeToCallAbortRacy(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 337 | #if ART_USE_FUTEXES |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 338 | if (state_.LoadRelaxed() != 0) { |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 339 | LOG(safe_to_call_abort ? FATAL : WARNING) |
| 340 | << "destroying mutex with owner: " << exclusive_owner_; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 341 | } else { |
Andreas Gampe | 8f1fa10 | 2015-01-22 19:48:51 -0800 | [diff] [blame] | 342 | if (exclusive_owner_ != 0) { |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 343 | LOG(safe_to_call_abort ? FATAL : WARNING) |
| 344 | << "unexpectedly found an owner on unlocked mutex " << name_; |
Andreas Gampe | 8f1fa10 | 2015-01-22 19:48:51 -0800 | [diff] [blame] | 345 | } |
| 346 | if (num_contenders_.LoadSequentiallyConsistent() != 0) { |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 347 | LOG(safe_to_call_abort ? FATAL : WARNING) |
| 348 | << "unexpectedly found a contender on mutex " << name_; |
Mathieu Chartier | cef50f0 | 2014-12-09 17:38:52 -0800 | [diff] [blame] | 349 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 350 | } |
| 351 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 352 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 353 | // may still be using locks. |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 354 | int rc = pthread_mutex_destroy(&mutex_); |
| 355 | if (rc != 0) { |
| 356 | errno = rc; |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 357 | PLOG(safe_to_call_abort ? FATAL : WARNING) |
| 358 | << "pthread_mutex_destroy failed for " << name_; |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 359 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 360 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 361 | } |
| 362 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 363 | void Mutex::ExclusiveLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 364 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 365 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 366 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 367 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 368 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 369 | #if ART_USE_FUTEXES |
| 370 | bool done = false; |
| 371 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 372 | int32_t cur_state = state_.LoadRelaxed(); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 373 | if (LIKELY(cur_state == 0)) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 374 | // Change state from 0 to 1 and impose load/store ordering appropriate for lock acquisition. |
| 375 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state */, 1 /* new state */); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 376 | } else { |
| 377 | // Failed to acquire, hang up. |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 378 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 379 | num_contenders_++; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 380 | if (futex(state_.Address(), FUTEX_WAIT, 1, nullptr, nullptr, 0) != 0) { |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 381 | // EAGAIN and EINTR both indicate a spurious failure, try again from the beginning. |
| 382 | // We don't use TEMP_FAILURE_RETRY so we can intentionally retry to acquire the lock. |
| 383 | if ((errno != EAGAIN) && (errno != EINTR)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 384 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 385 | } |
| 386 | } |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 387 | num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 388 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 389 | } while (!done); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 390 | DCHECK_EQ(state_.LoadRelaxed(), 1); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 391 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 392 | CHECK_MUTEX_CALL(pthread_mutex_lock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 393 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 394 | DCHECK_EQ(exclusive_owner_, 0U); |
| 395 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 396 | RegisterAsLocked(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 397 | } |
| 398 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 399 | if (kDebugLocking) { |
| 400 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 401 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 402 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 403 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 404 | } |
| 405 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 406 | bool Mutex::ExclusiveTryLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 407 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 408 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 409 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 410 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 411 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 412 | #if ART_USE_FUTEXES |
| 413 | bool done = false; |
| 414 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 415 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 416 | if (cur_state == 0) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 417 | // Change state from 0 to 1 and impose load/store ordering appropriate for lock acquisition. |
| 418 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state */, 1 /* new state */); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 419 | } else { |
| 420 | return false; |
| 421 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 422 | } while (!done); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 423 | DCHECK_EQ(state_.LoadRelaxed(), 1); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 424 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 425 | int result = pthread_mutex_trylock(&mutex_); |
| 426 | if (result == EBUSY) { |
| 427 | return false; |
| 428 | } |
| 429 | if (result != 0) { |
| 430 | errno = result; |
| 431 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 432 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 433 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 434 | DCHECK_EQ(exclusive_owner_, 0U); |
| 435 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 436 | RegisterAsLocked(self); |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 437 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 438 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 439 | if (kDebugLocking) { |
| 440 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 441 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 442 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 443 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 444 | return true; |
| 445 | } |
| 446 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 447 | void Mutex::ExclusiveUnlock(Thread* self) { |
Mathieu Chartier | eb0a179 | 2014-12-15 17:23:45 -0800 | [diff] [blame] | 448 | if (kIsDebugBuild && self != nullptr && self != Thread::Current()) { |
| 449 | std::string name1 = "<null>"; |
| 450 | std::string name2 = "<null>"; |
| 451 | if (self != nullptr) { |
| 452 | self->GetThreadName(name1); |
| 453 | } |
| 454 | if (Thread::Current() != nullptr) { |
| 455 | Thread::Current()->GetThreadName(name2); |
| 456 | } |
Mathieu Chartier | 4c10110 | 2015-01-27 17:14:16 -0800 | [diff] [blame] | 457 | LOG(FATAL) << GetName() << " level=" << level_ << " self=" << name1 |
| 458 | << " Thread::Current()=" << name2; |
Mathieu Chartier | eb0a179 | 2014-12-15 17:23:45 -0800 | [diff] [blame] | 459 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 460 | AssertHeld(self); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 461 | DCHECK_NE(exclusive_owner_, 0U); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 462 | recursion_count_--; |
| 463 | if (!recursive_ || recursion_count_ == 0) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 464 | if (kDebugLocking) { |
| 465 | CHECK(recursion_count_ == 0 || recursive_) << "Unexpected recursion count on mutex: " |
| 466 | << name_ << " " << recursion_count_; |
| 467 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 468 | RegisterAsUnlocked(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 469 | #if ART_USE_FUTEXES |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 470 | bool done = false; |
| 471 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 472 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 473 | if (LIKELY(cur_state == 1)) { |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 474 | // We're no longer the owner. |
| 475 | exclusive_owner_ = 0; |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 476 | // Change state to 0 and impose load/store ordering appropriate for lock release. |
| 477 | // Note, the relaxed loads below musn't reorder before the CompareExchange. |
| 478 | // TODO: the ordering here is non-trivial as state is split across 3 fields, fix by placing |
| 479 | // a status bit into the state on contention. |
| 480 | done = state_.CompareExchangeWeakSequentiallyConsistent(cur_state, 0 /* new state */); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 481 | if (LIKELY(done)) { // Spurious fail? |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 482 | // Wake a contender. |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 483 | if (UNLIKELY(num_contenders_.LoadRelaxed() > 0)) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 484 | futex(state_.Address(), FUTEX_WAKE, 1, nullptr, nullptr, 0); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 485 | } |
| 486 | } |
| 487 | } else { |
| 488 | // Logging acquires the logging lock, avoid infinite recursion in that case. |
| 489 | if (this != Locks::logging_lock_) { |
| 490 | LOG(FATAL) << "Unexpected state_ in unlock " << cur_state << " for " << name_; |
| 491 | } else { |
Andreas Gampe | 3fec9ac | 2016-09-13 10:47:28 -0700 | [diff] [blame] | 492 | LogHelper::LogLineLowStack(__FILE__, |
| 493 | __LINE__, |
| 494 | ::android::base::FATAL_WITHOUT_ABORT, |
| 495 | StringPrintf("Unexpected state_ %d in unlock for %s", |
| 496 | cur_state, name_).c_str()); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 497 | _exit(1); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 498 | } |
| 499 | } |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 500 | } while (!done); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 501 | #else |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 502 | exclusive_owner_ = 0; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 503 | CHECK_MUTEX_CALL(pthread_mutex_unlock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 504 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 505 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 506 | } |
| 507 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 508 | void Mutex::Dump(std::ostream& os) const { |
| 509 | os << (recursive_ ? "recursive " : "non-recursive ") |
| 510 | << name_ |
| 511 | << " level=" << static_cast<int>(level_) |
| 512 | << " rec=" << recursion_count_ |
| 513 | << " owner=" << GetExclusiveOwnerTid() << " "; |
| 514 | DumpContention(os); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | std::ostream& operator<<(std::ostream& os, const Mutex& mu) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 518 | mu.Dump(os); |
| 519 | return os; |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 520 | } |
| 521 | |
Brian Carlstrom | 02c8cc6 | 2013-07-18 15:54:44 -0700 | [diff] [blame] | 522 | ReaderWriterMutex::ReaderWriterMutex(const char* name, LockLevel level) |
| 523 | : BaseMutex(name, level) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 524 | #if ART_USE_FUTEXES |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 525 | , state_(0), num_pending_readers_(0), num_pending_writers_(0) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 526 | #endif |
Brian Carlstrom | 7934ac2 | 2013-07-26 10:54:15 -0700 | [diff] [blame] | 527 | { // NOLINT(whitespace/braces) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 528 | #if !ART_USE_FUTEXES |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 529 | CHECK_MUTEX_CALL(pthread_rwlock_init, (&rwlock_, nullptr)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 530 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 531 | exclusive_owner_ = 0; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | ReaderWriterMutex::~ReaderWriterMutex() { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 535 | #if ART_USE_FUTEXES |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 536 | CHECK_EQ(state_.LoadRelaxed(), 0); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 537 | CHECK_EQ(exclusive_owner_, 0U); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 538 | CHECK_EQ(num_pending_readers_.LoadRelaxed(), 0); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 539 | CHECK_EQ(num_pending_writers_.LoadRelaxed(), 0); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 540 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 541 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 542 | // may still be using locks. |
| 543 | int rc = pthread_rwlock_destroy(&rwlock_); |
| 544 | if (rc != 0) { |
| 545 | errno = rc; |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 546 | bool is_safe_to_call_abort = IsSafeToCallAbortSafe(); |
| 547 | 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] | 548 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 549 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 550 | } |
| 551 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 552 | void ReaderWriterMutex::ExclusiveLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 553 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 554 | AssertNotExclusiveHeld(self); |
| 555 | #if ART_USE_FUTEXES |
| 556 | bool done = false; |
| 557 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 558 | int32_t cur_state = state_.LoadRelaxed(); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 559 | if (LIKELY(cur_state == 0)) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 560 | // Change state from 0 to -1 and impose load/store ordering appropriate for lock acquisition. |
| 561 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state*/, -1 /* new state */); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 562 | } else { |
| 563 | // Failed to acquire, hang up. |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 564 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 565 | ++num_pending_writers_; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 566 | if (futex(state_.Address(), FUTEX_WAIT, cur_state, nullptr, nullptr, 0) != 0) { |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 567 | // EAGAIN and EINTR both indicate a spurious failure, try again from the beginning. |
| 568 | // We don't use TEMP_FAILURE_RETRY so we can intentionally retry to acquire the lock. |
| 569 | if ((errno != EAGAIN) && (errno != EINTR)) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 570 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 571 | } |
| 572 | } |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 573 | --num_pending_writers_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 574 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 575 | } while (!done); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 576 | DCHECK_EQ(state_.LoadRelaxed(), -1); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 577 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 578 | CHECK_MUTEX_CALL(pthread_rwlock_wrlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 579 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 580 | DCHECK_EQ(exclusive_owner_, 0U); |
| 581 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 582 | RegisterAsLocked(self); |
| 583 | AssertExclusiveHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 584 | } |
| 585 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 586 | void ReaderWriterMutex::ExclusiveUnlock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 587 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 588 | AssertExclusiveHeld(self); |
| 589 | RegisterAsUnlocked(self); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 590 | DCHECK_NE(exclusive_owner_, 0U); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 591 | #if ART_USE_FUTEXES |
| 592 | bool done = false; |
| 593 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 594 | int32_t cur_state = state_.LoadRelaxed(); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 595 | if (LIKELY(cur_state == -1)) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 596 | // We're no longer the owner. |
| 597 | exclusive_owner_ = 0; |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 598 | // Change state from -1 to 0 and impose load/store ordering appropriate for lock release. |
| 599 | // Note, the relaxed loads below musn't reorder before the CompareExchange. |
| 600 | // TODO: the ordering here is non-trivial as state is split across 3 fields, fix by placing |
| 601 | // a status bit into the state on contention. |
| 602 | done = state_.CompareExchangeWeakSequentiallyConsistent(-1 /* cur_state*/, 0 /* new state */); |
| 603 | if (LIKELY(done)) { // Weak CAS may fail spuriously. |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 604 | // Wake any waiters. |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 605 | if (UNLIKELY(num_pending_readers_.LoadRelaxed() > 0 || |
| 606 | num_pending_writers_.LoadRelaxed() > 0)) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 607 | futex(state_.Address(), FUTEX_WAKE, -1, nullptr, nullptr, 0); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 608 | } |
| 609 | } |
| 610 | } else { |
| 611 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 612 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 613 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 614 | #else |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 615 | exclusive_owner_ = 0; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 616 | CHECK_MUTEX_CALL(pthread_rwlock_unlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 617 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 618 | } |
| 619 | |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 620 | #if HAVE_TIMED_RWLOCK |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 621 | bool ReaderWriterMutex::ExclusiveLockWithTimeout(Thread* self, int64_t ms, int32_t ns) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 622 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 623 | #if ART_USE_FUTEXES |
| 624 | bool done = false; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 625 | timespec end_abs_ts; |
tony.ys_liu | 071e48e | 2015-01-14 18:28:03 +0800 | [diff] [blame] | 626 | InitTimeSpec(true, CLOCK_MONOTONIC, ms, ns, &end_abs_ts); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 627 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 628 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 629 | if (cur_state == 0) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 630 | // Change state from 0 to -1 and impose load/store ordering appropriate for lock acquisition. |
| 631 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state */, -1 /* new state */); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 632 | } else { |
| 633 | // Failed to acquire, hang up. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 634 | timespec now_abs_ts; |
tony.ys_liu | 071e48e | 2015-01-14 18:28:03 +0800 | [diff] [blame] | 635 | InitTimeSpec(true, CLOCK_MONOTONIC, 0, 0, &now_abs_ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 636 | timespec rel_ts; |
| 637 | if (ComputeRelativeTimeSpec(&rel_ts, end_abs_ts, now_abs_ts)) { |
| 638 | return false; // Timed out. |
| 639 | } |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 640 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 641 | ++num_pending_writers_; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 642 | 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] | 643 | if (errno == ETIMEDOUT) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 644 | --num_pending_writers_; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 645 | return false; // Timed out. |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 646 | } else if ((errno != EAGAIN) && (errno != EINTR)) { |
| 647 | // EAGAIN and EINTR both indicate a spurious failure, |
| 648 | // recompute the relative time out from now and try again. |
| 649 | // 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] | 650 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 651 | } |
| 652 | } |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 653 | --num_pending_writers_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 654 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 655 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 656 | #else |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 657 | timespec ts; |
Brian Carlstrom | bcc2926 | 2012-11-02 11:36:03 -0700 | [diff] [blame] | 658 | InitTimeSpec(true, CLOCK_REALTIME, ms, ns, &ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 659 | int result = pthread_rwlock_timedwrlock(&rwlock_, &ts); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 660 | if (result == ETIMEDOUT) { |
| 661 | return false; |
| 662 | } |
| 663 | if (result != 0) { |
| 664 | errno = result; |
Ian Rogers | a5acfd3 | 2012-08-15 11:50:10 -0700 | [diff] [blame] | 665 | PLOG(FATAL) << "pthread_rwlock_timedwrlock failed for " << name_; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 666 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 667 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 668 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 669 | RegisterAsLocked(self); |
| 670 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 671 | return true; |
| 672 | } |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 673 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 674 | |
Ian Rogers | 51d212e | 2014-10-23 17:48:20 -0700 | [diff] [blame] | 675 | #if ART_USE_FUTEXES |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 676 | void ReaderWriterMutex::HandleSharedLockContention(Thread* self, int32_t cur_state) { |
| 677 | // Owner holds it exclusively, hang up. |
| 678 | ScopedContentionRecorder scr(this, GetExclusiveOwnerTid(), SafeGetTid(self)); |
| 679 | ++num_pending_readers_; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 680 | if (futex(state_.Address(), FUTEX_WAIT, cur_state, nullptr, nullptr, 0) != 0) { |
Daniel Colascione | 6f4d102 | 2016-11-21 14:35:42 -0800 | [diff] [blame] | 681 | if (errno != EAGAIN && errno != EINTR) { |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 682 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 683 | } |
| 684 | } |
| 685 | --num_pending_readers_; |
| 686 | } |
Ian Rogers | 51d212e | 2014-10-23 17:48:20 -0700 | [diff] [blame] | 687 | #endif |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 688 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 689 | bool ReaderWriterMutex::SharedTryLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 690 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 691 | #if ART_USE_FUTEXES |
| 692 | bool done = false; |
| 693 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 694 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 695 | if (cur_state >= 0) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 696 | // Add as an extra reader and impose load/store ordering appropriate for lock acquisition. |
| 697 | done = state_.CompareExchangeWeakAcquire(cur_state, cur_state + 1); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 698 | } else { |
| 699 | // Owner holds it exclusively. |
| 700 | return false; |
| 701 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 702 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 703 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 704 | int result = pthread_rwlock_tryrdlock(&rwlock_); |
| 705 | if (result == EBUSY) { |
| 706 | return false; |
| 707 | } |
| 708 | if (result != 0) { |
| 709 | errno = result; |
| 710 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 711 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 712 | #endif |
| 713 | RegisterAsLocked(self); |
| 714 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 715 | return true; |
| 716 | } |
| 717 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 718 | bool ReaderWriterMutex::IsSharedHeld(const Thread* self) const { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 719 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 720 | bool result; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 721 | if (UNLIKELY(self == nullptr)) { // Handle unattached threads. |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 722 | result = IsExclusiveHeld(self); // TODO: a better best effort here. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 723 | } else { |
| 724 | result = (self->GetHeldMutex(level_) == this); |
| 725 | } |
| 726 | return result; |
| 727 | } |
| 728 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 729 | void ReaderWriterMutex::Dump(std::ostream& os) const { |
| 730 | os << name_ |
| 731 | << " level=" << static_cast<int>(level_) |
Mathieu Chartier | 5869a2c | 2014-10-08 14:26:23 -0700 | [diff] [blame] | 732 | << " owner=" << GetExclusiveOwnerTid() |
| 733 | #if ART_USE_FUTEXES |
| 734 | << " state=" << state_.LoadSequentiallyConsistent() |
| 735 | << " num_pending_writers=" << num_pending_writers_.LoadSequentiallyConsistent() |
| 736 | << " num_pending_readers=" << num_pending_readers_.LoadSequentiallyConsistent() |
| 737 | #endif |
| 738 | << " "; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 739 | DumpContention(os); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 740 | } |
| 741 | |
| 742 | std::ostream& operator<<(std::ostream& os, const ReaderWriterMutex& mu) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 743 | mu.Dump(os); |
| 744 | return os; |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 745 | } |
| 746 | |
Yu Li | eac4424 | 2015-06-29 10:50:03 +0800 | [diff] [blame] | 747 | std::ostream& operator<<(std::ostream& os, const MutatorMutex& mu) { |
| 748 | mu.Dump(os); |
| 749 | return os; |
| 750 | } |
| 751 | |
Ian Rogers | 23055dc | 2013-04-18 16:29:16 -0700 | [diff] [blame] | 752 | ConditionVariable::ConditionVariable(const char* name, Mutex& guard) |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 753 | : name_(name), guard_(guard) { |
| 754 | #if ART_USE_FUTEXES |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 755 | DCHECK_EQ(0, sequence_.LoadRelaxed()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 756 | num_waiters_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 757 | #else |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 758 | pthread_condattr_t cond_attrs; |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 759 | CHECK_MUTEX_CALL(pthread_condattr_init, (&cond_attrs)); |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 760 | #if !defined(__APPLE__) |
| 761 | // Apple doesn't have CLOCK_MONOTONIC or pthread_condattr_setclock. |
Ian Rogers | 51d212e | 2014-10-23 17:48:20 -0700 | [diff] [blame] | 762 | CHECK_MUTEX_CALL(pthread_condattr_setclock, (&cond_attrs, CLOCK_MONOTONIC)); |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 763 | #endif |
| 764 | CHECK_MUTEX_CALL(pthread_cond_init, (&cond_, &cond_attrs)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 765 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 766 | } |
| 767 | |
| 768 | ConditionVariable::~ConditionVariable() { |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 769 | #if ART_USE_FUTEXES |
| 770 | if (num_waiters_!= 0) { |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 771 | bool is_safe_to_call_abort = IsSafeToCallAbortSafe(); |
| 772 | LOG(is_safe_to_call_abort ? FATAL : WARNING) |
Andreas Gampe | 3fec9ac | 2016-09-13 10:47:28 -0700 | [diff] [blame] | 773 | << "ConditionVariable::~ConditionVariable for " << name_ |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 774 | << " called with " << num_waiters_ << " waiters."; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 775 | } |
| 776 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 777 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 778 | // may still be using condition variables. |
| 779 | int rc = pthread_cond_destroy(&cond_); |
| 780 | if (rc != 0) { |
| 781 | errno = rc; |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 782 | bool is_safe_to_call_abort = IsSafeToCallAbortSafe(); |
| 783 | 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] | 784 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 785 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 786 | } |
| 787 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 788 | void ConditionVariable::Broadcast(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 789 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 790 | // TODO: enable below, there's a race in thread creation that causes false failures currently. |
| 791 | // guard_.AssertExclusiveHeld(self); |
Mathieu Chartier | e46cd75 | 2012-10-31 16:56:18 -0700 | [diff] [blame] | 792 | DCHECK_EQ(guard_.GetExclusiveOwnerTid(), SafeGetTid(self)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 793 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 794 | if (num_waiters_ > 0) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 795 | sequence_++; // Indicate the broadcast occurred. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 796 | bool done = false; |
| 797 | do { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 798 | int32_t cur_sequence = sequence_.LoadRelaxed(); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 799 | // Requeue waiters onto mutex. The waiter holds the contender count on the mutex high ensuring |
| 800 | // mutex unlocks will awaken the requeued waiter thread. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 801 | done = futex(sequence_.Address(), FUTEX_CMP_REQUEUE, 0, |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 802 | reinterpret_cast<const timespec*>(std::numeric_limits<int32_t>::max()), |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 803 | guard_.state_.Address(), cur_sequence) != -1; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 804 | if (!done) { |
Daniel Colascione | 6f4d102 | 2016-11-21 14:35:42 -0800 | [diff] [blame] | 805 | if (errno != EAGAIN && errno != EINTR) { |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 806 | PLOG(FATAL) << "futex cmp requeue failed for " << name_; |
| 807 | } |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 808 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 809 | } while (!done); |
| 810 | } |
| 811 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 812 | CHECK_MUTEX_CALL(pthread_cond_broadcast, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 813 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 814 | } |
| 815 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 816 | void ConditionVariable::Signal(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 817 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 818 | guard_.AssertExclusiveHeld(self); |
| 819 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 820 | if (num_waiters_ > 0) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 821 | sequence_++; // Indicate a signal occurred. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 822 | // Futex wake 1 waiter who will then come and in contend on mutex. It'd be nice to requeue them |
| 823 | // to avoid this, however, requeueing can only move all waiters. |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 824 | int num_woken = futex(sequence_.Address(), FUTEX_WAKE, 1, nullptr, nullptr, 0); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 825 | // 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] | 826 | CHECK((num_woken == 0) || (num_woken == 1)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 827 | } |
| 828 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 829 | CHECK_MUTEX_CALL(pthread_cond_signal, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 830 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 831 | } |
| 832 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 833 | void ConditionVariable::Wait(Thread* self) { |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 834 | guard_.CheckSafeToWait(self); |
| 835 | WaitHoldingLocks(self); |
| 836 | } |
| 837 | |
| 838 | void ConditionVariable::WaitHoldingLocks(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 839 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 840 | guard_.AssertExclusiveHeld(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 841 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 842 | #if ART_USE_FUTEXES |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 843 | num_waiters_++; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 844 | // Ensure the Mutex is contended so that requeued threads are awoken. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 845 | guard_.num_contenders_++; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 846 | guard_.recursion_count_ = 1; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 847 | int32_t cur_sequence = sequence_.LoadRelaxed(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 848 | guard_.ExclusiveUnlock(self); |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 849 | if (futex(sequence_.Address(), FUTEX_WAIT, cur_sequence, nullptr, nullptr, 0) != 0) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 850 | // Futex failed, check it is an expected error. |
| 851 | // EAGAIN == EWOULDBLK, so we let the caller try again. |
| 852 | // EINTR implies a signal was sent to this thread. |
| 853 | if ((errno != EINTR) && (errno != EAGAIN)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 854 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 855 | } |
| 856 | } |
Mathieu Chartier | 4d87df6 | 2016-01-07 15:14:19 -0800 | [diff] [blame] | 857 | if (self != nullptr) { |
| 858 | JNIEnvExt* const env = self->GetJniEnv(); |
| 859 | if (UNLIKELY(env != nullptr && env->runtime_deleted)) { |
| 860 | CHECK(self->IsDaemon()); |
| 861 | // If the runtime has been deleted, then we cannot proceed. Just sleep forever. This may |
| 862 | // occur for user daemon threads that get a spurious wakeup. This occurs for test 132 with |
| 863 | // --host and --gdb. |
| 864 | // After we wake up, the runtime may have been shutdown, which means that this condition may |
| 865 | // have been deleted. It is not safe to retry the wait. |
| 866 | SleepForever(); |
| 867 | } |
| 868 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 869 | guard_.ExclusiveLock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 870 | CHECK_GE(num_waiters_, 0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 871 | num_waiters_--; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 872 | // 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] | 873 | CHECK_GE(guard_.num_contenders_.LoadRelaxed(), 0); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 874 | guard_.num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 875 | #else |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 876 | uint64_t old_owner = guard_.exclusive_owner_; |
| 877 | guard_.exclusive_owner_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 878 | guard_.recursion_count_ = 0; |
| 879 | CHECK_MUTEX_CALL(pthread_cond_wait, (&cond_, &guard_.mutex_)); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 880 | guard_.exclusive_owner_ = old_owner; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 881 | #endif |
| 882 | guard_.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 883 | } |
| 884 | |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 885 | bool ConditionVariable::TimedWait(Thread* self, int64_t ms, int32_t ns) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 886 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 887 | bool timed_out = false; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 888 | guard_.AssertExclusiveHeld(self); |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 889 | guard_.CheckSafeToWait(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 890 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 891 | #if ART_USE_FUTEXES |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 892 | timespec rel_ts; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 893 | InitTimeSpec(false, CLOCK_REALTIME, ms, ns, &rel_ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 894 | num_waiters_++; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 895 | // Ensure the Mutex is contended so that requeued threads are awoken. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 896 | guard_.num_contenders_++; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 897 | guard_.recursion_count_ = 1; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 898 | int32_t cur_sequence = sequence_.LoadRelaxed(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 899 | guard_.ExclusiveUnlock(self); |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 900 | 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] | 901 | if (errno == ETIMEDOUT) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 902 | // Timed out we're done. |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 903 | timed_out = true; |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 904 | } else if ((errno == EAGAIN) || (errno == EINTR)) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 905 | // A signal or ConditionVariable::Signal/Broadcast has come in. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 906 | } else { |
| 907 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 908 | } |
| 909 | } |
| 910 | guard_.ExclusiveLock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 911 | CHECK_GE(num_waiters_, 0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 912 | num_waiters_--; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 913 | // 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] | 914 | CHECK_GE(guard_.num_contenders_.LoadRelaxed(), 0); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 915 | guard_.num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 916 | #else |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 917 | #if !defined(__APPLE__) |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 918 | int clock = CLOCK_MONOTONIC; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 919 | #else |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 920 | int clock = CLOCK_REALTIME; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 921 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 922 | uint64_t old_owner = guard_.exclusive_owner_; |
| 923 | guard_.exclusive_owner_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 924 | guard_.recursion_count_ = 0; |
| 925 | timespec ts; |
Brian Carlstrom | bcc2926 | 2012-11-02 11:36:03 -0700 | [diff] [blame] | 926 | InitTimeSpec(true, clock, ms, ns, &ts); |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 927 | int rc = TEMP_FAILURE_RETRY(pthread_cond_timedwait(&cond_, &guard_.mutex_, &ts)); |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 928 | if (rc == ETIMEDOUT) { |
| 929 | timed_out = true; |
| 930 | } else if (rc != 0) { |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 931 | errno = rc; |
| 932 | PLOG(FATAL) << "TimedWait failed for " << name_; |
| 933 | } |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 934 | guard_.exclusive_owner_ = old_owner; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 935 | #endif |
| 936 | guard_.recursion_count_ = old_recursion_count; |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 937 | return timed_out; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 938 | } |
| 939 | |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 940 | void Locks::Init() { |
| 941 | if (logging_lock_ != nullptr) { |
| 942 | // Already initialized. |
Nicolas Geoffray | 7f0a6d6 | 2014-05-26 14:01:46 +0100 | [diff] [blame] | 943 | if (kRuntimeISA == kX86 || kRuntimeISA == kX86_64) { |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 944 | DCHECK(modify_ldt_lock_ != nullptr); |
| 945 | } else { |
| 946 | DCHECK(modify_ldt_lock_ == nullptr); |
| 947 | } |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 948 | DCHECK(abort_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 949 | DCHECK(alloc_tracker_lock_ != nullptr); |
Andreas Gampe | 7424081 | 2014-04-17 10:35:09 -0700 | [diff] [blame] | 950 | DCHECK(allocated_monitor_ids_lock_ != nullptr); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 951 | DCHECK(allocated_thread_ids_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 952 | DCHECK(breakpoint_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 953 | DCHECK(classlinker_classes_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 954 | DCHECK(deoptimization_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 955 | DCHECK(heap_bitmap_lock_ != nullptr); |
Mathieu Chartier | f9c6fc6 | 2015-10-07 11:44:05 -0700 | [diff] [blame] | 956 | DCHECK(oat_file_manager_lock_ != nullptr); |
David Brazdil | ca3c8c3 | 2016-09-06 14:04:48 +0100 | [diff] [blame] | 957 | DCHECK(verifier_deps_lock_ != nullptr); |
Richard Uhler | a206c74 | 2016-05-24 15:04:22 -0700 | [diff] [blame] | 958 | DCHECK(host_dlopen_handles_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 959 | DCHECK(intern_table_lock_ != nullptr); |
Ian Rogers | 68d8b42 | 2014-07-17 11:09:10 -0700 | [diff] [blame] | 960 | DCHECK(jni_libraries_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 961 | DCHECK(logging_lock_ != nullptr); |
| 962 | DCHECK(mutator_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 963 | DCHECK(profiler_lock_ != nullptr); |
Mingyao Yang | 063fc77 | 2016-08-02 11:02:54 -0700 | [diff] [blame] | 964 | DCHECK(cha_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 965 | DCHECK(thread_list_lock_ != nullptr); |
| 966 | DCHECK(thread_suspend_count_lock_ != nullptr); |
| 967 | DCHECK(trace_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 968 | DCHECK(unexpected_signal_lock_ != nullptr); |
Andreas Gampe | cc1b535 | 2016-12-01 16:58:38 -0800 | [diff] [blame] | 969 | DCHECK(dex_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 970 | } else { |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 971 | // Create global locks in level order from highest lock level to lowest. |
Ian Rogers | 4ad5cd3 | 2014-11-11 23:08:07 -0800 | [diff] [blame] | 972 | LockLevel current_lock_level = kInstrumentEntrypointsLock; |
| 973 | DCHECK(instrument_entrypoints_lock_ == nullptr); |
| 974 | instrument_entrypoints_lock_ = new Mutex("instrument entrypoint lock", current_lock_level); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 975 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 976 | #define UPDATE_CURRENT_LOCK_LEVEL(new_level) \ |
Chih-Hung Hsieh | fba3997 | 2016-05-11 11:26:48 -0700 | [diff] [blame] | 977 | if ((new_level) >= current_lock_level) { \ |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 978 | /* Do not use CHECKs or FATAL here, abort_lock_ is not setup yet. */ \ |
| 979 | fprintf(stderr, "New local level %d is not less than current level %d\n", \ |
| 980 | new_level, current_lock_level); \ |
| 981 | exit(1); \ |
| 982 | } \ |
Ian Rogers | f3d874c | 2014-07-17 18:52:42 -0700 | [diff] [blame] | 983 | current_lock_level = new_level; |
| 984 | |
| 985 | UPDATE_CURRENT_LOCK_LEVEL(kMutatorLock); |
| 986 | DCHECK(mutator_lock_ == nullptr); |
Yu Li | eac4424 | 2015-06-29 10:50:03 +0800 | [diff] [blame] | 987 | mutator_lock_ = new MutatorMutex("mutator lock", current_lock_level); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 988 | |
| 989 | UPDATE_CURRENT_LOCK_LEVEL(kHeapBitmapLock); |
| 990 | DCHECK(heap_bitmap_lock_ == nullptr); |
| 991 | heap_bitmap_lock_ = new ReaderWriterMutex("heap bitmap lock", current_lock_level); |
| 992 | |
Jeff Hao | 69dbec6 | 2014-09-15 18:03:41 -0700 | [diff] [blame] | 993 | UPDATE_CURRENT_LOCK_LEVEL(kTraceLock); |
| 994 | DCHECK(trace_lock_ == nullptr); |
| 995 | trace_lock_ = new Mutex("trace lock", current_lock_level); |
| 996 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 997 | UPDATE_CURRENT_LOCK_LEVEL(kRuntimeShutdownLock); |
| 998 | DCHECK(runtime_shutdown_lock_ == nullptr); |
| 999 | runtime_shutdown_lock_ = new Mutex("runtime shutdown lock", current_lock_level); |
| 1000 | |
| 1001 | UPDATE_CURRENT_LOCK_LEVEL(kProfilerLock); |
| 1002 | DCHECK(profiler_lock_ == nullptr); |
| 1003 | profiler_lock_ = new Mutex("profiler lock", current_lock_level); |
| 1004 | |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 1005 | UPDATE_CURRENT_LOCK_LEVEL(kDeoptimizationLock); |
| 1006 | DCHECK(deoptimization_lock_ == nullptr); |
| 1007 | deoptimization_lock_ = new Mutex("Deoptimization lock", current_lock_level); |
| 1008 | |
| 1009 | UPDATE_CURRENT_LOCK_LEVEL(kAllocTrackerLock); |
| 1010 | DCHECK(alloc_tracker_lock_ == nullptr); |
| 1011 | alloc_tracker_lock_ = new Mutex("AllocTracker lock", current_lock_level); |
| 1012 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1013 | UPDATE_CURRENT_LOCK_LEVEL(kThreadListLock); |
| 1014 | DCHECK(thread_list_lock_ == nullptr); |
| 1015 | thread_list_lock_ = new Mutex("thread list lock", current_lock_level); |
| 1016 | |
Ian Rogers | 68d8b42 | 2014-07-17 11:09:10 -0700 | [diff] [blame] | 1017 | UPDATE_CURRENT_LOCK_LEVEL(kJniLoadLibraryLock); |
| 1018 | DCHECK(jni_libraries_lock_ == nullptr); |
| 1019 | jni_libraries_lock_ = new Mutex("JNI shared libraries map lock", current_lock_level); |
| 1020 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1021 | UPDATE_CURRENT_LOCK_LEVEL(kBreakpointLock); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1022 | DCHECK(breakpoint_lock_ == nullptr); |
Sebastien Hertz | ed2be17 | 2014-08-19 15:33:43 +0200 | [diff] [blame] | 1023 | breakpoint_lock_ = new ReaderWriterMutex("breakpoint lock", current_lock_level); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1024 | |
Mingyao Yang | 063fc77 | 2016-08-02 11:02:54 -0700 | [diff] [blame] | 1025 | UPDATE_CURRENT_LOCK_LEVEL(kCHALock); |
| 1026 | DCHECK(cha_lock_ == nullptr); |
| 1027 | cha_lock_ = new Mutex("CHA lock", current_lock_level); |
| 1028 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1029 | UPDATE_CURRENT_LOCK_LEVEL(kClassLinkerClassesLock); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1030 | DCHECK(classlinker_classes_lock_ == nullptr); |
| 1031 | classlinker_classes_lock_ = new ReaderWriterMutex("ClassLinker classes lock", |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1032 | current_lock_level); |
| 1033 | |
Andreas Gampe | 7424081 | 2014-04-17 10:35:09 -0700 | [diff] [blame] | 1034 | UPDATE_CURRENT_LOCK_LEVEL(kMonitorPoolLock); |
| 1035 | DCHECK(allocated_monitor_ids_lock_ == nullptr); |
| 1036 | allocated_monitor_ids_lock_ = new Mutex("allocated monitor ids lock", current_lock_level); |
| 1037 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1038 | UPDATE_CURRENT_LOCK_LEVEL(kAllocatedThreadIdsLock); |
| 1039 | DCHECK(allocated_thread_ids_lock_ == nullptr); |
| 1040 | allocated_thread_ids_lock_ = new Mutex("allocated thread ids lock", current_lock_level); |
| 1041 | |
Nicolas Geoffray | 7f0a6d6 | 2014-05-26 14:01:46 +0100 | [diff] [blame] | 1042 | if (kRuntimeISA == kX86 || kRuntimeISA == kX86_64) { |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1043 | UPDATE_CURRENT_LOCK_LEVEL(kModifyLdtLock); |
| 1044 | DCHECK(modify_ldt_lock_ == nullptr); |
| 1045 | modify_ldt_lock_ = new Mutex("modify_ldt lock", current_lock_level); |
| 1046 | } |
| 1047 | |
Andreas Gampe | cc1b535 | 2016-12-01 16:58:38 -0800 | [diff] [blame] | 1048 | UPDATE_CURRENT_LOCK_LEVEL(kDexLock); |
| 1049 | DCHECK(dex_lock_ == nullptr); |
| 1050 | dex_lock_ = new ReaderWriterMutex("ClassLinker dex lock", current_lock_level); |
| 1051 | |
Mathieu Chartier | f9c6fc6 | 2015-10-07 11:44:05 -0700 | [diff] [blame] | 1052 | UPDATE_CURRENT_LOCK_LEVEL(kOatFileManagerLock); |
| 1053 | DCHECK(oat_file_manager_lock_ == nullptr); |
| 1054 | oat_file_manager_lock_ = new ReaderWriterMutex("OatFile manager lock", current_lock_level); |
| 1055 | |
David Brazdil | ca3c8c3 | 2016-09-06 14:04:48 +0100 | [diff] [blame] | 1056 | UPDATE_CURRENT_LOCK_LEVEL(kVerifierDepsLock); |
| 1057 | DCHECK(verifier_deps_lock_ == nullptr); |
Nicolas Geoffray | 340dafa | 2016-11-18 16:03:10 +0000 | [diff] [blame] | 1058 | verifier_deps_lock_ = new ReaderWriterMutex("verifier deps lock", current_lock_level); |
David Brazdil | ca3c8c3 | 2016-09-06 14:04:48 +0100 | [diff] [blame] | 1059 | |
Richard Uhler | a206c74 | 2016-05-24 15:04:22 -0700 | [diff] [blame] | 1060 | UPDATE_CURRENT_LOCK_LEVEL(kHostDlOpenHandlesLock); |
| 1061 | DCHECK(host_dlopen_handles_lock_ == nullptr); |
| 1062 | 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] | 1063 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1064 | UPDATE_CURRENT_LOCK_LEVEL(kInternTableLock); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1065 | DCHECK(intern_table_lock_ == nullptr); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1066 | intern_table_lock_ = new Mutex("InternTable lock", current_lock_level); |
| 1067 | |
Mathieu Chartier | a5a53ef | 2014-09-12 12:58:05 -0700 | [diff] [blame] | 1068 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceProcessorLock); |
| 1069 | DCHECK(reference_processor_lock_ == nullptr); |
| 1070 | reference_processor_lock_ = new Mutex("ReferenceProcessor lock", current_lock_level); |
| 1071 | |
| 1072 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueClearedReferencesLock); |
| 1073 | DCHECK(reference_queue_cleared_references_lock_ == nullptr); |
| 1074 | reference_queue_cleared_references_lock_ = new Mutex("ReferenceQueue cleared references lock", current_lock_level); |
| 1075 | |
| 1076 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueWeakReferencesLock); |
| 1077 | DCHECK(reference_queue_weak_references_lock_ == nullptr); |
| 1078 | reference_queue_weak_references_lock_ = new Mutex("ReferenceQueue cleared references lock", current_lock_level); |
| 1079 | |
| 1080 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueFinalizerReferencesLock); |
| 1081 | DCHECK(reference_queue_finalizer_references_lock_ == nullptr); |
| 1082 | reference_queue_finalizer_references_lock_ = new Mutex("ReferenceQueue finalizer references lock", current_lock_level); |
| 1083 | |
| 1084 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueuePhantomReferencesLock); |
| 1085 | DCHECK(reference_queue_phantom_references_lock_ == nullptr); |
| 1086 | reference_queue_phantom_references_lock_ = new Mutex("ReferenceQueue phantom references lock", current_lock_level); |
| 1087 | |
| 1088 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueSoftReferencesLock); |
| 1089 | DCHECK(reference_queue_soft_references_lock_ == nullptr); |
| 1090 | reference_queue_soft_references_lock_ = new Mutex("ReferenceQueue soft references lock", current_lock_level); |
| 1091 | |
Andreas Gampe | 05a364c | 2016-10-14 13:27:12 -0700 | [diff] [blame] | 1092 | UPDATE_CURRENT_LOCK_LEVEL(kJniGlobalsLock); |
| 1093 | DCHECK(jni_globals_lock_ == nullptr); |
| 1094 | jni_globals_lock_ = |
| 1095 | new ReaderWriterMutex("JNI global reference table lock", current_lock_level); |
| 1096 | |
| 1097 | UPDATE_CURRENT_LOCK_LEVEL(kJniWeakGlobalsLock); |
| 1098 | DCHECK(jni_weak_globals_lock_ == nullptr); |
| 1099 | jni_weak_globals_lock_ = new Mutex("JNI weak global reference table lock", current_lock_level); |
| 1100 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1101 | UPDATE_CURRENT_LOCK_LEVEL(kAbortLock); |
| 1102 | DCHECK(abort_lock_ == nullptr); |
| 1103 | abort_lock_ = new Mutex("abort lock", current_lock_level, true); |
| 1104 | |
| 1105 | UPDATE_CURRENT_LOCK_LEVEL(kThreadSuspendCountLock); |
| 1106 | DCHECK(thread_suspend_count_lock_ == nullptr); |
| 1107 | thread_suspend_count_lock_ = new Mutex("thread suspend count lock", current_lock_level); |
| 1108 | |
| 1109 | UPDATE_CURRENT_LOCK_LEVEL(kUnexpectedSignalLock); |
| 1110 | DCHECK(unexpected_signal_lock_ == nullptr); |
| 1111 | unexpected_signal_lock_ = new Mutex("unexpected signal lock", current_lock_level, true); |
| 1112 | |
Hiroshi Yamauchi | 3eed93d | 2014-06-04 11:43:59 -0700 | [diff] [blame] | 1113 | UPDATE_CURRENT_LOCK_LEVEL(kMemMapsLock); |
| 1114 | DCHECK(mem_maps_lock_ == nullptr); |
| 1115 | mem_maps_lock_ = new Mutex("mem maps lock", current_lock_level); |
| 1116 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1117 | UPDATE_CURRENT_LOCK_LEVEL(kLoggingLock); |
| 1118 | DCHECK(logging_lock_ == nullptr); |
| 1119 | logging_lock_ = new Mutex("logging lock", current_lock_level, true); |
| 1120 | |
| 1121 | #undef UPDATE_CURRENT_LOCK_LEVEL |
Mathieu Chartier | 91e5669 | 2015-03-03 13:51:04 -0800 | [diff] [blame] | 1122 | |
| 1123 | InitConditions(); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1124 | } |
| 1125 | } |
| 1126 | |
Mathieu Chartier | 91e5669 | 2015-03-03 13:51:04 -0800 | [diff] [blame] | 1127 | void Locks::InitConditions() { |
| 1128 | thread_exit_cond_ = new ConditionVariable("thread exit condition variable", *thread_list_lock_); |
| 1129 | } |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1130 | |
David Sehr | f42eb2c | 2016-10-19 13:20:45 -0700 | [diff] [blame] | 1131 | void Locks::SetClientCallback(ClientCallback* safe_to_call_abort_cb) { |
| 1132 | safe_to_call_abort_callback.StoreRelease(safe_to_call_abort_cb); |
| 1133 | } |
| 1134 | |
| 1135 | // Helper to allow checking shutdown while ignoring locking requirements. |
| 1136 | bool Locks::IsSafeToCallAbortRacy() { |
| 1137 | Locks::ClientCallback* safe_to_call_abort_cb = safe_to_call_abort_callback.LoadAcquire(); |
| 1138 | return safe_to_call_abort_cb != nullptr && safe_to_call_abort_cb(); |
| 1139 | } |
| 1140 | |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 1141 | } // namespace art |