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 | |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 22 | #include "atomic.h" |
Elliott Hughes | 07ed66b | 2012-12-12 18:34:25 -0800 | [diff] [blame] | 23 | #include "base/logging.h" |
Vladimir Marko | 80afd02 | 2015-05-19 18:08:00 +0100 | [diff] [blame] | 24 | #include "base/time_utils.h" |
Mathieu Chartier | 32ce2ad | 2016-03-04 14:58:03 -0800 | [diff] [blame] | 25 | #include "base/systrace.h" |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 26 | #include "base/value_object.h" |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame] | 27 | #include "mutex-inl.h" |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 28 | #include "runtime.h" |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 29 | #include "scoped_thread_state_change.h" |
Ian Rogers | 04d7aa9 | 2013-03-16 14:29:17 -0700 | [diff] [blame] | 30 | #include "thread-inl.h" |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 31 | |
| 32 | namespace art { |
| 33 | |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 34 | Mutex* Locks::abort_lock_ = nullptr; |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 35 | Mutex* Locks::alloc_tracker_lock_ = nullptr; |
Andreas Gampe | 7424081 | 2014-04-17 10:35:09 -0700 | [diff] [blame] | 36 | Mutex* Locks::allocated_monitor_ids_lock_ = nullptr; |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 37 | Mutex* Locks::allocated_thread_ids_lock_ = nullptr; |
Sebastien Hertz | ed2be17 | 2014-08-19 15:33:43 +0200 | [diff] [blame] | 38 | ReaderWriterMutex* Locks::breakpoint_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 39 | ReaderWriterMutex* Locks::classlinker_classes_lock_ = nullptr; |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 40 | Mutex* Locks::deoptimization_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 41 | ReaderWriterMutex* Locks::heap_bitmap_lock_ = nullptr; |
Mathieu Chartier | 9ef78b5 | 2014-09-25 17:03:12 -0700 | [diff] [blame] | 42 | Mutex* Locks::instrument_entrypoints_lock_ = nullptr; |
Mathieu Chartier | a5a53ef | 2014-09-12 12:58:05 -0700 | [diff] [blame] | 43 | Mutex* Locks::intern_table_lock_ = nullptr; |
Jeff Hao | a2c3864 | 2015-09-17 17:29:01 -0700 | [diff] [blame] | 44 | Mutex* Locks::interpreter_string_init_map_lock_ = nullptr; |
Ian Rogers | 68d8b42 | 2014-07-17 11:09:10 -0700 | [diff] [blame] | 45 | Mutex* Locks::jni_libraries_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 46 | Mutex* Locks::logging_lock_ = nullptr; |
Hiroshi Yamauchi | 3eed93d | 2014-06-04 11:43:59 -0700 | [diff] [blame] | 47 | Mutex* Locks::mem_maps_lock_ = nullptr; |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 48 | Mutex* Locks::modify_ldt_lock_ = nullptr; |
Yu Li | eac4424 | 2015-06-29 10:50:03 +0800 | [diff] [blame] | 49 | MutatorMutex* Locks::mutator_lock_ = nullptr; |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 50 | Mutex* Locks::profiler_lock_ = nullptr; |
Mathieu Chartier | f9c6fc6 | 2015-10-07 11:44:05 -0700 | [diff] [blame] | 51 | ReaderWriterMutex* Locks::oat_file_manager_lock_ = nullptr; |
Mathieu Chartier | e58991b | 2015-10-13 07:59:34 -0700 | [diff] [blame] | 52 | ReaderWriterMutex* Locks::oat_file_count_lock_ = nullptr; |
Mathieu Chartier | a5a53ef | 2014-09-12 12:58:05 -0700 | [diff] [blame] | 53 | Mutex* Locks::reference_processor_lock_ = nullptr; |
| 54 | Mutex* Locks::reference_queue_cleared_references_lock_ = nullptr; |
| 55 | Mutex* Locks::reference_queue_finalizer_references_lock_ = nullptr; |
| 56 | Mutex* Locks::reference_queue_phantom_references_lock_ = nullptr; |
| 57 | Mutex* Locks::reference_queue_soft_references_lock_ = nullptr; |
| 58 | Mutex* Locks::reference_queue_weak_references_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 59 | Mutex* Locks::runtime_shutdown_lock_ = nullptr; |
| 60 | Mutex* Locks::thread_list_lock_ = nullptr; |
Mathieu Chartier | 91e5669 | 2015-03-03 13:51:04 -0800 | [diff] [blame] | 61 | ConditionVariable* Locks::thread_exit_cond_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 62 | Mutex* Locks::thread_suspend_count_lock_ = nullptr; |
| 63 | Mutex* Locks::trace_lock_ = nullptr; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 64 | Mutex* Locks::unexpected_signal_lock_ = nullptr; |
Igor Murashkin | e2facc5 | 2015-07-10 13:49:08 -0700 | [diff] [blame] | 65 | Mutex* Locks::lambda_table_lock_ = nullptr; |
Andreas Gampe | 5bdb655 | 2015-07-22 23:44:55 -0700 | [diff] [blame] | 66 | Uninterruptible Roles::uninterruptible_; |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 67 | |
| 68 | struct AllMutexData { |
| 69 | // A guard for all_mutexes_ that's not a mutex (Mutexes must CAS to acquire and busy wait). |
| 70 | Atomic<const BaseMutex*> all_mutexes_guard; |
| 71 | // All created mutexes guarded by all_mutexes_guard_. |
| 72 | std::set<BaseMutex*>* all_mutexes; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 73 | AllMutexData() : all_mutexes(nullptr) {} |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 74 | }; |
| 75 | static struct AllMutexData gAllMutexData[kAllMutexDataSize]; |
| 76 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 77 | #if ART_USE_FUTEXES |
| 78 | static bool ComputeRelativeTimeSpec(timespec* result_ts, const timespec& lhs, const timespec& rhs) { |
Brian Carlstrom | fb6996f | 2013-07-18 18:21:14 -0700 | [diff] [blame] | 79 | const int32_t one_sec = 1000 * 1000 * 1000; // one second in nanoseconds. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 80 | result_ts->tv_sec = lhs.tv_sec - rhs.tv_sec; |
| 81 | result_ts->tv_nsec = lhs.tv_nsec - rhs.tv_nsec; |
| 82 | if (result_ts->tv_nsec < 0) { |
| 83 | result_ts->tv_sec--; |
| 84 | result_ts->tv_nsec += one_sec; |
| 85 | } else if (result_ts->tv_nsec > one_sec) { |
| 86 | result_ts->tv_sec++; |
| 87 | result_ts->tv_nsec -= one_sec; |
| 88 | } |
| 89 | return result_ts->tv_sec < 0; |
| 90 | } |
| 91 | #endif |
| 92 | |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 93 | class ScopedAllMutexesLock FINAL { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 94 | public: |
Brian Carlstrom | 93ba893 | 2013-07-17 21:31:49 -0700 | [diff] [blame] | 95 | explicit ScopedAllMutexesLock(const BaseMutex* mutex) : mutex_(mutex) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 96 | while (!gAllMutexData->all_mutexes_guard.CompareExchangeWeakAcquire(0, mutex)) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 97 | NanoSleep(100); |
| 98 | } |
| 99 | } |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 100 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 101 | ~ScopedAllMutexesLock() { |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 102 | #if !defined(__clang__) |
| 103 | // TODO: remove this workaround target GCC/libc++/bionic bug "invalid failure memory model". |
| 104 | while (!gAllMutexData->all_mutexes_guard.CompareExchangeWeakSequentiallyConsistent(mutex_, 0)) { |
| 105 | #else |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 106 | while (!gAllMutexData->all_mutexes_guard.CompareExchangeWeakRelease(mutex_, 0)) { |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 107 | #endif |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 108 | NanoSleep(100); |
| 109 | } |
| 110 | } |
Ian Rogers | 6f3dbba | 2014-10-14 17:41:57 -0700 | [diff] [blame] | 111 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 112 | private: |
| 113 | const BaseMutex* const mutex_; |
| 114 | }; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 115 | |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 116 | // Scoped class that generates events at the beginning and end of lock contention. |
| 117 | class ScopedContentionRecorder FINAL : public ValueObject { |
| 118 | public: |
| 119 | ScopedContentionRecorder(BaseMutex* mutex, uint64_t blocked_tid, uint64_t owner_tid) |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 120 | : mutex_(kLogLockContentions ? mutex : nullptr), |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 121 | blocked_tid_(kLogLockContentions ? blocked_tid : 0), |
| 122 | owner_tid_(kLogLockContentions ? owner_tid : 0), |
| 123 | start_nano_time_(kLogLockContentions ? NanoTime() : 0) { |
| 124 | if (ATRACE_ENABLED()) { |
| 125 | std::string msg = StringPrintf("Lock contention on %s (owner tid: %" PRIu64 ")", |
| 126 | mutex->GetName(), owner_tid); |
| 127 | ATRACE_BEGIN(msg.c_str()); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | ~ScopedContentionRecorder() { |
| 132 | ATRACE_END(); |
| 133 | if (kLogLockContentions) { |
| 134 | uint64_t end_nano_time = NanoTime(); |
| 135 | mutex_->RecordContention(blocked_tid_, owner_tid_, end_nano_time - start_nano_time_); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | private: |
| 140 | BaseMutex* const mutex_; |
| 141 | const uint64_t blocked_tid_; |
| 142 | const uint64_t owner_tid_; |
| 143 | const uint64_t start_nano_time_; |
| 144 | }; |
| 145 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 146 | BaseMutex::BaseMutex(const char* name, LockLevel level) : level_(level), name_(name) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 147 | if (kLogLockContentions) { |
| 148 | ScopedAllMutexesLock mu(this); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 149 | std::set<BaseMutex*>** all_mutexes_ptr = &gAllMutexData->all_mutexes; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 150 | if (*all_mutexes_ptr == nullptr) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 151 | // We leak the global set of all mutexes to avoid ordering issues in global variable |
| 152 | // construction/destruction. |
| 153 | *all_mutexes_ptr = new std::set<BaseMutex*>(); |
| 154 | } |
| 155 | (*all_mutexes_ptr)->insert(this); |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 156 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | BaseMutex::~BaseMutex() { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 160 | if (kLogLockContentions) { |
| 161 | ScopedAllMutexesLock mu(this); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 162 | gAllMutexData->all_mutexes->erase(this); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 163 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | void BaseMutex::DumpAll(std::ostream& os) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 167 | if (kLogLockContentions) { |
| 168 | os << "Mutex logging:\n"; |
| 169 | ScopedAllMutexesLock mu(reinterpret_cast<const BaseMutex*>(-1)); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 170 | std::set<BaseMutex*>* all_mutexes = gAllMutexData->all_mutexes; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 171 | if (all_mutexes == nullptr) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 172 | // No mutexes have been created yet during at startup. |
| 173 | return; |
| 174 | } |
| 175 | typedef std::set<BaseMutex*>::const_iterator It; |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 176 | os << "(Contended)\n"; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 177 | for (It it = all_mutexes->begin(); it != all_mutexes->end(); ++it) { |
| 178 | BaseMutex* mutex = *it; |
| 179 | if (mutex->HasEverContended()) { |
| 180 | mutex->Dump(os); |
| 181 | os << "\n"; |
| 182 | } |
| 183 | } |
| 184 | os << "(Never contented)\n"; |
| 185 | for (It it = all_mutexes->begin(); it != all_mutexes->end(); ++it) { |
| 186 | BaseMutex* mutex = *it; |
| 187 | if (!mutex->HasEverContended()) { |
| 188 | mutex->Dump(os); |
| 189 | os << "\n"; |
| 190 | } |
| 191 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 192 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 193 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 194 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 195 | void BaseMutex::CheckSafeToWait(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 196 | if (self == nullptr) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 197 | CheckUnattachedThread(level_); |
| 198 | return; |
| 199 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 200 | if (kDebugLocking) { |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 201 | CHECK(self->GetHeldMutex(level_) == this || level_ == kMonitorLock) |
| 202 | << "Waiting on unacquired mutex: " << name_; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 203 | bool bad_mutexes_held = false; |
Elliott Hughes | 0f82716 | 2013-02-26 12:12:58 -0800 | [diff] [blame] | 204 | for (int i = kLockLevelCount - 1; i >= 0; --i) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 205 | if (i != level_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 206 | BaseMutex* held_mutex = self->GetHeldMutex(static_cast<LockLevel>(i)); |
Ian Rogers | f3d874c | 2014-07-17 18:52:42 -0700 | [diff] [blame] | 207 | // 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] | 208 | if (held_mutex != nullptr) { |
Elliott Hughes | 0f82716 | 2013-02-26 12:12:58 -0800 | [diff] [blame] | 209 | LOG(ERROR) << "Holding \"" << held_mutex->name_ << "\" " |
| 210 | << "(level " << LockLevel(i) << ") while performing wait on " |
| 211 | << "\"" << name_ << "\" (level " << level_ << ")"; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 212 | bad_mutexes_held = true; |
| 213 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 214 | } |
| 215 | } |
Nicolas Geoffray | db97871 | 2014-12-09 13:33:38 +0000 | [diff] [blame] | 216 | if (gAborting == 0) { // Avoid recursive aborts. |
| 217 | CHECK(!bad_mutexes_held); |
| 218 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 219 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 220 | } |
| 221 | |
Ian Rogers | 37f3c96 | 2014-07-17 11:25:30 -0700 | [diff] [blame] | 222 | void BaseMutex::ContentionLogData::AddToWaitTime(uint64_t value) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 223 | if (kLogLockContentions) { |
| 224 | // Atomically add value to wait_time. |
Ian Rogers | 37f3c96 | 2014-07-17 11:25:30 -0700 | [diff] [blame] | 225 | wait_time.FetchAndAddSequentiallyConsistent(value); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 226 | } |
| 227 | } |
| 228 | |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 229 | void BaseMutex::RecordContention(uint64_t blocked_tid, |
| 230 | uint64_t owner_tid, |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 231 | uint64_t nano_time_blocked) { |
| 232 | if (kLogLockContentions) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 233 | ContentionLogData* data = contention_log_data_; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 234 | ++(data->contention_count); |
| 235 | data->AddToWaitTime(nano_time_blocked); |
| 236 | ContentionLogEntry* log = data->contention_log; |
| 237 | // This code is intentionally racy as it is only used for diagnostics. |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 238 | uint32_t slot = data->cur_content_log_entry.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 239 | if (log[slot].blocked_tid == blocked_tid && |
| 240 | log[slot].owner_tid == blocked_tid) { |
| 241 | ++log[slot].count; |
| 242 | } else { |
| 243 | uint32_t new_slot; |
| 244 | do { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 245 | slot = data->cur_content_log_entry.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 246 | new_slot = (slot + 1) % kContentionLogSize; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 247 | } while (!data->cur_content_log_entry.CompareExchangeWeakRelaxed(slot, new_slot)); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 248 | log[new_slot].blocked_tid = blocked_tid; |
| 249 | log[new_slot].owner_tid = owner_tid; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 250 | log[new_slot].count.StoreRelaxed(1); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 251 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 252 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 253 | } |
| 254 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 255 | void BaseMutex::DumpContention(std::ostream& os) const { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 256 | if (kLogLockContentions) { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 257 | const ContentionLogData* data = contention_log_data_; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 258 | const ContentionLogEntry* log = data->contention_log; |
Ian Rogers | 37f3c96 | 2014-07-17 11:25:30 -0700 | [diff] [blame] | 259 | uint64_t wait_time = data->wait_time.LoadRelaxed(); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 260 | uint32_t contention_count = data->contention_count.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 261 | if (contention_count == 0) { |
| 262 | os << "never contended"; |
| 263 | } else { |
| 264 | os << "contended " << contention_count |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 265 | << " total wait of contender " << PrettyDuration(wait_time) |
| 266 | << " average " << PrettyDuration(wait_time / contention_count); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 267 | SafeMap<uint64_t, size_t> most_common_blocker; |
| 268 | SafeMap<uint64_t, size_t> most_common_blocked; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 269 | for (size_t i = 0; i < kContentionLogSize; ++i) { |
| 270 | uint64_t blocked_tid = log[i].blocked_tid; |
| 271 | uint64_t owner_tid = log[i].owner_tid; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 272 | uint32_t count = log[i].count.LoadRelaxed(); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 273 | if (count > 0) { |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 274 | auto it = most_common_blocked.find(blocked_tid); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 275 | if (it != most_common_blocked.end()) { |
| 276 | most_common_blocked.Overwrite(blocked_tid, it->second + count); |
| 277 | } else { |
| 278 | most_common_blocked.Put(blocked_tid, count); |
| 279 | } |
| 280 | it = most_common_blocker.find(owner_tid); |
| 281 | if (it != most_common_blocker.end()) { |
| 282 | most_common_blocker.Overwrite(owner_tid, it->second + count); |
| 283 | } else { |
| 284 | most_common_blocker.Put(owner_tid, count); |
| 285 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 286 | } |
| 287 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 288 | uint64_t max_tid = 0; |
| 289 | size_t max_tid_count = 0; |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 290 | for (const auto& pair : most_common_blocked) { |
| 291 | if (pair.second > max_tid_count) { |
| 292 | max_tid = pair.first; |
| 293 | max_tid_count = pair.second; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 294 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 295 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 296 | if (max_tid != 0) { |
| 297 | os << " sample shows most blocked tid=" << max_tid; |
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 | max_tid = 0; |
| 300 | max_tid_count = 0; |
Mathieu Chartier | 73d1e17 | 2014-04-11 17:53:48 -0700 | [diff] [blame] | 301 | for (const auto& pair : most_common_blocker) { |
| 302 | if (pair.second > max_tid_count) { |
| 303 | max_tid = pair.first; |
| 304 | max_tid_count = pair.second; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 305 | } |
| 306 | } |
| 307 | if (max_tid != 0) { |
| 308 | os << " sample shows tid=" << max_tid << " owning during this time"; |
| 309 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 310 | } |
| 311 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 315 | Mutex::Mutex(const char* name, LockLevel level, bool recursive) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 316 | : BaseMutex(name, level), recursive_(recursive), recursion_count_(0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 317 | #if ART_USE_FUTEXES |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 318 | DCHECK_EQ(0, state_.LoadRelaxed()); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 319 | DCHECK_EQ(0, num_contenders_.LoadRelaxed()); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 320 | #else |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 321 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, nullptr)); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 322 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 323 | exclusive_owner_ = 0; |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 324 | } |
| 325 | |
Andreas Gampe | 8f1fa10 | 2015-01-22 19:48:51 -0800 | [diff] [blame] | 326 | // Helper to ignore the lock requirement. |
| 327 | static bool IsShuttingDown() NO_THREAD_SAFETY_ANALYSIS { |
| 328 | Runtime* runtime = Runtime::Current(); |
| 329 | return runtime == nullptr || runtime->IsShuttingDownLocked(); |
| 330 | } |
| 331 | |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 332 | Mutex::~Mutex() { |
Andreas Gampe | 8f1fa10 | 2015-01-22 19:48:51 -0800 | [diff] [blame] | 333 | bool shutting_down = IsShuttingDown(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 334 | #if ART_USE_FUTEXES |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 335 | if (state_.LoadRelaxed() != 0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 336 | LOG(shutting_down ? WARNING : FATAL) << "destroying mutex with owner: " << exclusive_owner_; |
| 337 | } else { |
Andreas Gampe | 8f1fa10 | 2015-01-22 19:48:51 -0800 | [diff] [blame] | 338 | if (exclusive_owner_ != 0) { |
| 339 | LOG(shutting_down ? WARNING : FATAL) << "unexpectedly found an owner on unlocked mutex " |
| 340 | << name_; |
| 341 | } |
| 342 | if (num_contenders_.LoadSequentiallyConsistent() != 0) { |
| 343 | LOG(shutting_down ? WARNING : FATAL) << "unexpectedly found a contender on mutex " << name_; |
Mathieu Chartier | cef50f0 | 2014-12-09 17:38:52 -0800 | [diff] [blame] | 344 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 345 | } |
| 346 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 347 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 348 | // may still be using locks. |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 349 | int rc = pthread_mutex_destroy(&mutex_); |
| 350 | if (rc != 0) { |
| 351 | errno = rc; |
Elliott Hughes | b3bd5f0 | 2012-03-08 21:05:27 -0800 | [diff] [blame] | 352 | // TODO: should we just not log at all if shutting down? this could be the logging mutex! |
Ian Rogers | 50b35e2 | 2012-10-04 10:09:15 -0700 | [diff] [blame] | 353 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 354 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_mutex_destroy failed for " << name_; |
| 355 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 356 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 357 | } |
| 358 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 359 | void Mutex::ExclusiveLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 360 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 361 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 362 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 363 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 364 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 365 | #if ART_USE_FUTEXES |
| 366 | bool done = false; |
| 367 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 368 | int32_t cur_state = state_.LoadRelaxed(); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 369 | if (LIKELY(cur_state == 0)) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 370 | // Change state from 0 to 1 and impose load/store ordering appropriate for lock acquisition. |
| 371 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state */, 1 /* new state */); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 372 | } else { |
| 373 | // Failed to acquire, hang up. |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 374 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 375 | num_contenders_++; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 376 | if (futex(state_.Address(), FUTEX_WAIT, 1, nullptr, nullptr, 0) != 0) { |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 377 | // EAGAIN and EINTR both indicate a spurious failure, try again from the beginning. |
| 378 | // We don't use TEMP_FAILURE_RETRY so we can intentionally retry to acquire the lock. |
| 379 | if ((errno != EAGAIN) && (errno != EINTR)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 380 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 381 | } |
| 382 | } |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 383 | num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 384 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 385 | } while (!done); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 386 | DCHECK_EQ(state_.LoadRelaxed(), 1); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 387 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 388 | CHECK_MUTEX_CALL(pthread_mutex_lock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 389 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 390 | DCHECK_EQ(exclusive_owner_, 0U); |
| 391 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 392 | RegisterAsLocked(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 393 | } |
| 394 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 395 | if (kDebugLocking) { |
| 396 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 397 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 398 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 399 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 400 | } |
| 401 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 402 | bool Mutex::ExclusiveTryLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 403 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 404 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 405 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 406 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 407 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 408 | #if ART_USE_FUTEXES |
| 409 | bool done = false; |
| 410 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 411 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 412 | if (cur_state == 0) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 413 | // Change state from 0 to 1 and impose load/store ordering appropriate for lock acquisition. |
| 414 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state */, 1 /* new state */); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 415 | } else { |
| 416 | return false; |
| 417 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 418 | } while (!done); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 419 | DCHECK_EQ(state_.LoadRelaxed(), 1); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 420 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 421 | int result = pthread_mutex_trylock(&mutex_); |
| 422 | if (result == EBUSY) { |
| 423 | return false; |
| 424 | } |
| 425 | if (result != 0) { |
| 426 | errno = result; |
| 427 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 428 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 429 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 430 | DCHECK_EQ(exclusive_owner_, 0U); |
| 431 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 432 | RegisterAsLocked(self); |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 433 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 434 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 435 | if (kDebugLocking) { |
| 436 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 437 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 438 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 439 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 440 | return true; |
| 441 | } |
| 442 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 443 | void Mutex::ExclusiveUnlock(Thread* self) { |
Mathieu Chartier | eb0a179 | 2014-12-15 17:23:45 -0800 | [diff] [blame] | 444 | if (kIsDebugBuild && self != nullptr && self != Thread::Current()) { |
| 445 | std::string name1 = "<null>"; |
| 446 | std::string name2 = "<null>"; |
| 447 | if (self != nullptr) { |
| 448 | self->GetThreadName(name1); |
| 449 | } |
| 450 | if (Thread::Current() != nullptr) { |
| 451 | Thread::Current()->GetThreadName(name2); |
| 452 | } |
Mathieu Chartier | 4c10110 | 2015-01-27 17:14:16 -0800 | [diff] [blame] | 453 | LOG(FATAL) << GetName() << " level=" << level_ << " self=" << name1 |
| 454 | << " Thread::Current()=" << name2; |
Mathieu Chartier | eb0a179 | 2014-12-15 17:23:45 -0800 | [diff] [blame] | 455 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 456 | AssertHeld(self); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 457 | DCHECK_NE(exclusive_owner_, 0U); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 458 | recursion_count_--; |
| 459 | if (!recursive_ || recursion_count_ == 0) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 460 | if (kDebugLocking) { |
| 461 | CHECK(recursion_count_ == 0 || recursive_) << "Unexpected recursion count on mutex: " |
| 462 | << name_ << " " << recursion_count_; |
| 463 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 464 | RegisterAsUnlocked(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 465 | #if ART_USE_FUTEXES |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 466 | bool done = false; |
| 467 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 468 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 469 | if (LIKELY(cur_state == 1)) { |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 470 | // We're no longer the owner. |
| 471 | exclusive_owner_ = 0; |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 472 | // Change state to 0 and impose load/store ordering appropriate for lock release. |
| 473 | // Note, the relaxed loads below musn't reorder before the CompareExchange. |
| 474 | // TODO: the ordering here is non-trivial as state is split across 3 fields, fix by placing |
| 475 | // a status bit into the state on contention. |
| 476 | done = state_.CompareExchangeWeakSequentiallyConsistent(cur_state, 0 /* new state */); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 477 | if (LIKELY(done)) { // Spurious fail? |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 478 | // Wake a contender. |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 479 | if (UNLIKELY(num_contenders_.LoadRelaxed() > 0)) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 480 | futex(state_.Address(), FUTEX_WAKE, 1, nullptr, nullptr, 0); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 481 | } |
| 482 | } |
| 483 | } else { |
| 484 | // Logging acquires the logging lock, avoid infinite recursion in that case. |
| 485 | if (this != Locks::logging_lock_) { |
| 486 | LOG(FATAL) << "Unexpected state_ in unlock " << cur_state << " for " << name_; |
| 487 | } else { |
Ian Rogers | c7dd295 | 2014-10-21 23:31:19 -0700 | [diff] [blame] | 488 | LogMessage::LogLine(__FILE__, __LINE__, INTERNAL_FATAL, |
| 489 | StringPrintf("Unexpected state_ %d in unlock for %s", |
| 490 | cur_state, name_).c_str()); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 491 | _exit(1); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 492 | } |
| 493 | } |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 494 | } while (!done); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 495 | #else |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 496 | exclusive_owner_ = 0; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 497 | CHECK_MUTEX_CALL(pthread_mutex_unlock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 498 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 499 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 500 | } |
| 501 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 502 | void Mutex::Dump(std::ostream& os) const { |
| 503 | os << (recursive_ ? "recursive " : "non-recursive ") |
| 504 | << name_ |
| 505 | << " level=" << static_cast<int>(level_) |
| 506 | << " rec=" << recursion_count_ |
| 507 | << " owner=" << GetExclusiveOwnerTid() << " "; |
| 508 | DumpContention(os); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 509 | } |
| 510 | |
| 511 | std::ostream& operator<<(std::ostream& os, const Mutex& mu) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 512 | mu.Dump(os); |
| 513 | return os; |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 514 | } |
| 515 | |
Brian Carlstrom | 02c8cc6 | 2013-07-18 15:54:44 -0700 | [diff] [blame] | 516 | ReaderWriterMutex::ReaderWriterMutex(const char* name, LockLevel level) |
| 517 | : BaseMutex(name, level) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 518 | #if ART_USE_FUTEXES |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 519 | , state_(0), num_pending_readers_(0), num_pending_writers_(0) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 520 | #endif |
Brian Carlstrom | 7934ac2 | 2013-07-26 10:54:15 -0700 | [diff] [blame] | 521 | { // NOLINT(whitespace/braces) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 522 | #if !ART_USE_FUTEXES |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 523 | CHECK_MUTEX_CALL(pthread_rwlock_init, (&rwlock_, nullptr)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 524 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 525 | exclusive_owner_ = 0; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | ReaderWriterMutex::~ReaderWriterMutex() { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 529 | #if ART_USE_FUTEXES |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 530 | CHECK_EQ(state_.LoadRelaxed(), 0); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 531 | CHECK_EQ(exclusive_owner_, 0U); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 532 | CHECK_EQ(num_pending_readers_.LoadRelaxed(), 0); |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 533 | CHECK_EQ(num_pending_writers_.LoadRelaxed(), 0); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 534 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 535 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 536 | // may still be using locks. |
| 537 | int rc = pthread_rwlock_destroy(&rwlock_); |
| 538 | if (rc != 0) { |
| 539 | errno = rc; |
| 540 | // TODO: should we just not log at all if shutting down? this could be the logging mutex! |
Ian Rogers | 50b35e2 | 2012-10-04 10:09:15 -0700 | [diff] [blame] | 541 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 542 | Runtime* runtime = Runtime::Current(); |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 543 | bool shutting_down = runtime == nullptr || runtime->IsShuttingDownLocked(); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 544 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_rwlock_destroy failed for " << name_; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 545 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 546 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 547 | } |
| 548 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 549 | void ReaderWriterMutex::ExclusiveLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 550 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 551 | AssertNotExclusiveHeld(self); |
| 552 | #if ART_USE_FUTEXES |
| 553 | bool done = false; |
| 554 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 555 | int32_t cur_state = state_.LoadRelaxed(); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 556 | if (LIKELY(cur_state == 0)) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 557 | // Change state from 0 to -1 and impose load/store ordering appropriate for lock acquisition. |
| 558 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state*/, -1 /* new state */); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 559 | } else { |
| 560 | // Failed to acquire, hang up. |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 561 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 562 | ++num_pending_writers_; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 563 | if (futex(state_.Address(), FUTEX_WAIT, cur_state, nullptr, nullptr, 0) != 0) { |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 564 | // EAGAIN and EINTR both indicate a spurious failure, try again from the beginning. |
| 565 | // We don't use TEMP_FAILURE_RETRY so we can intentionally retry to acquire the lock. |
| 566 | if ((errno != EAGAIN) && (errno != EINTR)) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 567 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 568 | } |
| 569 | } |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 570 | --num_pending_writers_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 571 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 572 | } while (!done); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 573 | DCHECK_EQ(state_.LoadRelaxed(), -1); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 574 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 575 | CHECK_MUTEX_CALL(pthread_rwlock_wrlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 576 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 577 | DCHECK_EQ(exclusive_owner_, 0U); |
| 578 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 579 | RegisterAsLocked(self); |
| 580 | AssertExclusiveHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 581 | } |
| 582 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 583 | void ReaderWriterMutex::ExclusiveUnlock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 584 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 585 | AssertExclusiveHeld(self); |
| 586 | RegisterAsUnlocked(self); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 587 | DCHECK_NE(exclusive_owner_, 0U); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 588 | #if ART_USE_FUTEXES |
| 589 | bool done = false; |
| 590 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 591 | int32_t cur_state = state_.LoadRelaxed(); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 592 | if (LIKELY(cur_state == -1)) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 593 | // We're no longer the owner. |
| 594 | exclusive_owner_ = 0; |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 595 | // Change state from -1 to 0 and impose load/store ordering appropriate for lock release. |
| 596 | // Note, the relaxed loads below musn't reorder before the CompareExchange. |
| 597 | // TODO: the ordering here is non-trivial as state is split across 3 fields, fix by placing |
| 598 | // a status bit into the state on contention. |
| 599 | done = state_.CompareExchangeWeakSequentiallyConsistent(-1 /* cur_state*/, 0 /* new state */); |
| 600 | if (LIKELY(done)) { // Weak CAS may fail spuriously. |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 601 | // Wake any waiters. |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 602 | if (UNLIKELY(num_pending_readers_.LoadRelaxed() > 0 || |
| 603 | num_pending_writers_.LoadRelaxed() > 0)) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 604 | futex(state_.Address(), FUTEX_WAKE, -1, nullptr, nullptr, 0); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 605 | } |
| 606 | } |
| 607 | } else { |
| 608 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 609 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 610 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 611 | #else |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 612 | exclusive_owner_ = 0; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 613 | CHECK_MUTEX_CALL(pthread_rwlock_unlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 614 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 615 | } |
| 616 | |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 617 | #if HAVE_TIMED_RWLOCK |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 618 | bool ReaderWriterMutex::ExclusiveLockWithTimeout(Thread* self, int64_t ms, int32_t ns) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 619 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 620 | #if ART_USE_FUTEXES |
| 621 | bool done = false; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 622 | timespec end_abs_ts; |
tony.ys_liu | 071e48e | 2015-01-14 18:28:03 +0800 | [diff] [blame] | 623 | InitTimeSpec(true, CLOCK_MONOTONIC, ms, ns, &end_abs_ts); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 624 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 625 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 626 | if (cur_state == 0) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 627 | // Change state from 0 to -1 and impose load/store ordering appropriate for lock acquisition. |
| 628 | done = state_.CompareExchangeWeakAcquire(0 /* cur_state */, -1 /* new state */); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 629 | } else { |
| 630 | // Failed to acquire, hang up. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 631 | timespec now_abs_ts; |
tony.ys_liu | 071e48e | 2015-01-14 18:28:03 +0800 | [diff] [blame] | 632 | InitTimeSpec(true, CLOCK_MONOTONIC, 0, 0, &now_abs_ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 633 | timespec rel_ts; |
| 634 | if (ComputeRelativeTimeSpec(&rel_ts, end_abs_ts, now_abs_ts)) { |
| 635 | return false; // Timed out. |
| 636 | } |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 637 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 638 | ++num_pending_writers_; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 639 | 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] | 640 | if (errno == ETIMEDOUT) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 641 | --num_pending_writers_; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 642 | return false; // Timed out. |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 643 | } else if ((errno != EAGAIN) && (errno != EINTR)) { |
| 644 | // EAGAIN and EINTR both indicate a spurious failure, |
| 645 | // recompute the relative time out from now and try again. |
| 646 | // 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] | 647 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 648 | } |
| 649 | } |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 650 | --num_pending_writers_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 651 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 652 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 653 | #else |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 654 | timespec ts; |
Brian Carlstrom | bcc2926 | 2012-11-02 11:36:03 -0700 | [diff] [blame] | 655 | InitTimeSpec(true, CLOCK_REALTIME, ms, ns, &ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 656 | int result = pthread_rwlock_timedwrlock(&rwlock_, &ts); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 657 | if (result == ETIMEDOUT) { |
| 658 | return false; |
| 659 | } |
| 660 | if (result != 0) { |
| 661 | errno = result; |
Ian Rogers | a5acfd3 | 2012-08-15 11:50:10 -0700 | [diff] [blame] | 662 | PLOG(FATAL) << "pthread_rwlock_timedwrlock failed for " << name_; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 663 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 664 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 665 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 666 | RegisterAsLocked(self); |
| 667 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 668 | return true; |
| 669 | } |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 670 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 671 | |
Ian Rogers | 51d212e | 2014-10-23 17:48:20 -0700 | [diff] [blame] | 672 | #if ART_USE_FUTEXES |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 673 | void ReaderWriterMutex::HandleSharedLockContention(Thread* self, int32_t cur_state) { |
| 674 | // Owner holds it exclusively, hang up. |
| 675 | ScopedContentionRecorder scr(this, GetExclusiveOwnerTid(), SafeGetTid(self)); |
| 676 | ++num_pending_readers_; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 677 | if (futex(state_.Address(), FUTEX_WAIT, cur_state, nullptr, nullptr, 0) != 0) { |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 678 | if (errno != EAGAIN) { |
| 679 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 680 | } |
| 681 | } |
| 682 | --num_pending_readers_; |
| 683 | } |
Ian Rogers | 51d212e | 2014-10-23 17:48:20 -0700 | [diff] [blame] | 684 | #endif |
Ian Rogers | cf7f191 | 2014-10-22 22:06:39 -0700 | [diff] [blame] | 685 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 686 | bool ReaderWriterMutex::SharedTryLock(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 687 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 688 | #if ART_USE_FUTEXES |
| 689 | bool done = false; |
| 690 | do { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 691 | int32_t cur_state = state_.LoadRelaxed(); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 692 | if (cur_state >= 0) { |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 693 | // Add as an extra reader and impose load/store ordering appropriate for lock acquisition. |
| 694 | done = state_.CompareExchangeWeakAcquire(cur_state, cur_state + 1); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 695 | } else { |
| 696 | // Owner holds it exclusively. |
| 697 | return false; |
| 698 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 699 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 700 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 701 | int result = pthread_rwlock_tryrdlock(&rwlock_); |
| 702 | if (result == EBUSY) { |
| 703 | return false; |
| 704 | } |
| 705 | if (result != 0) { |
| 706 | errno = result; |
| 707 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 708 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 709 | #endif |
| 710 | RegisterAsLocked(self); |
| 711 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 712 | return true; |
| 713 | } |
| 714 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 715 | bool ReaderWriterMutex::IsSharedHeld(const Thread* self) const { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 716 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 717 | bool result; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 718 | if (UNLIKELY(self == nullptr)) { // Handle unattached threads. |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 719 | result = IsExclusiveHeld(self); // TODO: a better best effort here. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 720 | } else { |
| 721 | result = (self->GetHeldMutex(level_) == this); |
| 722 | } |
| 723 | return result; |
| 724 | } |
| 725 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 726 | void ReaderWriterMutex::Dump(std::ostream& os) const { |
| 727 | os << name_ |
| 728 | << " level=" << static_cast<int>(level_) |
Mathieu Chartier | 5869a2c | 2014-10-08 14:26:23 -0700 | [diff] [blame] | 729 | << " owner=" << GetExclusiveOwnerTid() |
| 730 | #if ART_USE_FUTEXES |
| 731 | << " state=" << state_.LoadSequentiallyConsistent() |
| 732 | << " num_pending_writers=" << num_pending_writers_.LoadSequentiallyConsistent() |
| 733 | << " num_pending_readers=" << num_pending_readers_.LoadSequentiallyConsistent() |
| 734 | #endif |
| 735 | << " "; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 736 | DumpContention(os); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 737 | } |
| 738 | |
| 739 | std::ostream& operator<<(std::ostream& os, const ReaderWriterMutex& mu) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 740 | mu.Dump(os); |
| 741 | return os; |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 742 | } |
| 743 | |
Yu Li | eac4424 | 2015-06-29 10:50:03 +0800 | [diff] [blame] | 744 | std::ostream& operator<<(std::ostream& os, const MutatorMutex& mu) { |
| 745 | mu.Dump(os); |
| 746 | return os; |
| 747 | } |
| 748 | |
Ian Rogers | 23055dc | 2013-04-18 16:29:16 -0700 | [diff] [blame] | 749 | ConditionVariable::ConditionVariable(const char* name, Mutex& guard) |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 750 | : name_(name), guard_(guard) { |
| 751 | #if ART_USE_FUTEXES |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 752 | DCHECK_EQ(0, sequence_.LoadRelaxed()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 753 | num_waiters_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 754 | #else |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 755 | pthread_condattr_t cond_attrs; |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 756 | CHECK_MUTEX_CALL(pthread_condattr_init, (&cond_attrs)); |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 757 | #if !defined(__APPLE__) |
| 758 | // Apple doesn't have CLOCK_MONOTONIC or pthread_condattr_setclock. |
Ian Rogers | 51d212e | 2014-10-23 17:48:20 -0700 | [diff] [blame] | 759 | CHECK_MUTEX_CALL(pthread_condattr_setclock, (&cond_attrs, CLOCK_MONOTONIC)); |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 760 | #endif |
| 761 | CHECK_MUTEX_CALL(pthread_cond_init, (&cond_, &cond_attrs)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 762 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 763 | } |
| 764 | |
| 765 | ConditionVariable::~ConditionVariable() { |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 766 | #if ART_USE_FUTEXES |
| 767 | if (num_waiters_!= 0) { |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 768 | Runtime* runtime = Runtime::Current(); |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 769 | bool shutting_down = runtime == nullptr || runtime->IsShuttingDown(Thread::Current()); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 770 | LOG(shutting_down ? WARNING : FATAL) << "ConditionVariable::~ConditionVariable for " << name_ |
| 771 | << " called with " << num_waiters_ << " waiters."; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 772 | } |
| 773 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 774 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 775 | // may still be using condition variables. |
| 776 | int rc = pthread_cond_destroy(&cond_); |
| 777 | if (rc != 0) { |
| 778 | errno = rc; |
Ian Rogers | 50b35e2 | 2012-10-04 10:09:15 -0700 | [diff] [blame] | 779 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 780 | Runtime* runtime = Runtime::Current(); |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 781 | bool shutting_down = (runtime == nullptr) || runtime->IsShuttingDownLocked(); |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 782 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_cond_destroy failed for " << name_; |
| 783 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 784 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 785 | } |
| 786 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 787 | void ConditionVariable::Broadcast(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 788 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 789 | // TODO: enable below, there's a race in thread creation that causes false failures currently. |
| 790 | // guard_.AssertExclusiveHeld(self); |
Mathieu Chartier | e46cd75 | 2012-10-31 16:56:18 -0700 | [diff] [blame] | 791 | DCHECK_EQ(guard_.GetExclusiveOwnerTid(), SafeGetTid(self)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 792 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 793 | if (num_waiters_ > 0) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 794 | sequence_++; // Indicate the broadcast occurred. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 795 | bool done = false; |
| 796 | do { |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 797 | int32_t cur_sequence = sequence_.LoadRelaxed(); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 798 | // Requeue waiters onto mutex. The waiter holds the contender count on the mutex high ensuring |
| 799 | // mutex unlocks will awaken the requeued waiter thread. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 800 | done = futex(sequence_.Address(), FUTEX_CMP_REQUEUE, 0, |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 801 | reinterpret_cast<const timespec*>(std::numeric_limits<int32_t>::max()), |
Ian Rogers | c719069 | 2014-07-08 23:50:26 -0700 | [diff] [blame] | 802 | guard_.state_.Address(), cur_sequence) != -1; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 803 | if (!done) { |
| 804 | if (errno != EAGAIN) { |
| 805 | PLOG(FATAL) << "futex cmp requeue failed for " << name_; |
| 806 | } |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 807 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 808 | } while (!done); |
| 809 | } |
| 810 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 811 | CHECK_MUTEX_CALL(pthread_cond_broadcast, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 812 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 813 | } |
| 814 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 815 | void ConditionVariable::Signal(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 816 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 817 | guard_.AssertExclusiveHeld(self); |
| 818 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 819 | if (num_waiters_ > 0) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 820 | sequence_++; // Indicate a signal occurred. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 821 | // Futex wake 1 waiter who will then come and in contend on mutex. It'd be nice to requeue them |
| 822 | // to avoid this, however, requeueing can only move all waiters. |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 823 | int num_woken = futex(sequence_.Address(), FUTEX_WAKE, 1, nullptr, nullptr, 0); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 824 | // 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] | 825 | CHECK((num_woken == 0) || (num_woken == 1)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 826 | } |
| 827 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 828 | CHECK_MUTEX_CALL(pthread_cond_signal, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 829 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 830 | } |
| 831 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 832 | void ConditionVariable::Wait(Thread* self) { |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 833 | guard_.CheckSafeToWait(self); |
| 834 | WaitHoldingLocks(self); |
| 835 | } |
| 836 | |
| 837 | void ConditionVariable::WaitHoldingLocks(Thread* self) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 838 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 839 | guard_.AssertExclusiveHeld(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 840 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 841 | #if ART_USE_FUTEXES |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 842 | num_waiters_++; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 843 | // Ensure the Mutex is contended so that requeued threads are awoken. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 844 | guard_.num_contenders_++; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 845 | guard_.recursion_count_ = 1; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 846 | int32_t cur_sequence = sequence_.LoadRelaxed(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 847 | guard_.ExclusiveUnlock(self); |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 848 | if (futex(sequence_.Address(), FUTEX_WAIT, cur_sequence, nullptr, nullptr, 0) != 0) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 849 | // Futex failed, check it is an expected error. |
| 850 | // EAGAIN == EWOULDBLK, so we let the caller try again. |
| 851 | // EINTR implies a signal was sent to this thread. |
| 852 | if ((errno != EINTR) && (errno != EAGAIN)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 853 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 854 | } |
| 855 | } |
Mathieu Chartier | 4d87df6 | 2016-01-07 15:14:19 -0800 | [diff] [blame] | 856 | if (self != nullptr) { |
| 857 | JNIEnvExt* const env = self->GetJniEnv(); |
| 858 | if (UNLIKELY(env != nullptr && env->runtime_deleted)) { |
| 859 | CHECK(self->IsDaemon()); |
| 860 | // If the runtime has been deleted, then we cannot proceed. Just sleep forever. This may |
| 861 | // occur for user daemon threads that get a spurious wakeup. This occurs for test 132 with |
| 862 | // --host and --gdb. |
| 863 | // After we wake up, the runtime may have been shutdown, which means that this condition may |
| 864 | // have been deleted. It is not safe to retry the wait. |
| 865 | SleepForever(); |
| 866 | } |
| 867 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 868 | guard_.ExclusiveLock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 869 | CHECK_GE(num_waiters_, 0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 870 | num_waiters_--; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 871 | // 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] | 872 | CHECK_GE(guard_.num_contenders_.LoadRelaxed(), 0); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 873 | guard_.num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 874 | #else |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 875 | uint64_t old_owner = guard_.exclusive_owner_; |
| 876 | guard_.exclusive_owner_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 877 | guard_.recursion_count_ = 0; |
| 878 | CHECK_MUTEX_CALL(pthread_cond_wait, (&cond_, &guard_.mutex_)); |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 879 | guard_.exclusive_owner_ = old_owner; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 880 | #endif |
| 881 | guard_.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 882 | } |
| 883 | |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 884 | bool ConditionVariable::TimedWait(Thread* self, int64_t ms, int32_t ns) { |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 885 | DCHECK(self == nullptr || self == Thread::Current()); |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 886 | bool timed_out = false; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 887 | guard_.AssertExclusiveHeld(self); |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 888 | guard_.CheckSafeToWait(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 889 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 890 | #if ART_USE_FUTEXES |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 891 | timespec rel_ts; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 892 | InitTimeSpec(false, CLOCK_REALTIME, ms, ns, &rel_ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 893 | num_waiters_++; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 894 | // Ensure the Mutex is contended so that requeued threads are awoken. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 895 | guard_.num_contenders_++; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 896 | guard_.recursion_count_ = 1; |
Ian Rogers | 3e5cf30 | 2014-05-20 16:40:37 -0700 | [diff] [blame] | 897 | int32_t cur_sequence = sequence_.LoadRelaxed(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 898 | guard_.ExclusiveUnlock(self); |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 899 | 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] | 900 | if (errno == ETIMEDOUT) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 901 | // Timed out we're done. |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 902 | timed_out = true; |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 903 | } else if ((errno == EAGAIN) || (errno == EINTR)) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 904 | // A signal or ConditionVariable::Signal/Broadcast has come in. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 905 | } else { |
| 906 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 907 | } |
| 908 | } |
| 909 | guard_.ExclusiveLock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 910 | CHECK_GE(num_waiters_, 0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 911 | num_waiters_--; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 912 | // 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] | 913 | CHECK_GE(guard_.num_contenders_.LoadRelaxed(), 0); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame] | 914 | guard_.num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 915 | #else |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 916 | #if !defined(__APPLE__) |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 917 | int clock = CLOCK_MONOTONIC; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 918 | #else |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 919 | int clock = CLOCK_REALTIME; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 920 | #endif |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 921 | uint64_t old_owner = guard_.exclusive_owner_; |
| 922 | guard_.exclusive_owner_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 923 | guard_.recursion_count_ = 0; |
| 924 | timespec ts; |
Brian Carlstrom | bcc2926 | 2012-11-02 11:36:03 -0700 | [diff] [blame] | 925 | InitTimeSpec(true, clock, ms, ns, &ts); |
Narayan Kamath | 51b7102 | 2014-03-04 11:57:09 +0000 | [diff] [blame] | 926 | int rc = TEMP_FAILURE_RETRY(pthread_cond_timedwait(&cond_, &guard_.mutex_, &ts)); |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 927 | if (rc == ETIMEDOUT) { |
| 928 | timed_out = true; |
| 929 | } else if (rc != 0) { |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 930 | errno = rc; |
| 931 | PLOG(FATAL) << "TimedWait failed for " << name_; |
| 932 | } |
Ian Rogers | c5f1773 | 2014-06-05 20:48:42 -0700 | [diff] [blame] | 933 | guard_.exclusive_owner_ = old_owner; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 934 | #endif |
| 935 | guard_.recursion_count_ = old_recursion_count; |
Ian Rogers | 7b078e8 | 2014-09-10 14:44:24 -0700 | [diff] [blame] | 936 | return timed_out; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 937 | } |
| 938 | |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 939 | void Locks::Init() { |
| 940 | if (logging_lock_ != nullptr) { |
| 941 | // Already initialized. |
Nicolas Geoffray | 7f0a6d6 | 2014-05-26 14:01:46 +0100 | [diff] [blame] | 942 | if (kRuntimeISA == kX86 || kRuntimeISA == kX86_64) { |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 943 | DCHECK(modify_ldt_lock_ != nullptr); |
| 944 | } else { |
| 945 | DCHECK(modify_ldt_lock_ == nullptr); |
| 946 | } |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 947 | DCHECK(abort_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 948 | DCHECK(alloc_tracker_lock_ != nullptr); |
Andreas Gampe | 7424081 | 2014-04-17 10:35:09 -0700 | [diff] [blame] | 949 | DCHECK(allocated_monitor_ids_lock_ != nullptr); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 950 | DCHECK(allocated_thread_ids_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 951 | DCHECK(breakpoint_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 952 | DCHECK(classlinker_classes_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 953 | DCHECK(deoptimization_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 954 | DCHECK(heap_bitmap_lock_ != nullptr); |
Mathieu Chartier | f9c6fc6 | 2015-10-07 11:44:05 -0700 | [diff] [blame] | 955 | DCHECK(oat_file_manager_lock_ != nullptr); |
Mathieu Chartier | e58991b | 2015-10-13 07:59:34 -0700 | [diff] [blame] | 956 | DCHECK(oat_file_count_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 957 | DCHECK(intern_table_lock_ != nullptr); |
Ian Rogers | 68d8b42 | 2014-07-17 11:09:10 -0700 | [diff] [blame] | 958 | DCHECK(jni_libraries_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 959 | DCHECK(logging_lock_ != nullptr); |
| 960 | DCHECK(mutator_lock_ != nullptr); |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 961 | DCHECK(profiler_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 962 | DCHECK(thread_list_lock_ != nullptr); |
| 963 | DCHECK(thread_suspend_count_lock_ != nullptr); |
| 964 | DCHECK(trace_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 965 | DCHECK(unexpected_signal_lock_ != nullptr); |
Igor Murashkin | e2facc5 | 2015-07-10 13:49:08 -0700 | [diff] [blame] | 966 | DCHECK(lambda_table_lock_ != nullptr); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 967 | } else { |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 968 | // Create global locks in level order from highest lock level to lowest. |
Ian Rogers | 4ad5cd3 | 2014-11-11 23:08:07 -0800 | [diff] [blame] | 969 | LockLevel current_lock_level = kInstrumentEntrypointsLock; |
| 970 | DCHECK(instrument_entrypoints_lock_ == nullptr); |
| 971 | instrument_entrypoints_lock_ = new Mutex("instrument entrypoint lock", current_lock_level); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 972 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 973 | #define UPDATE_CURRENT_LOCK_LEVEL(new_level) \ |
Chih-Hung Hsieh | fba3997 | 2016-05-11 11:26:48 -0700 | [diff] [blame^] | 974 | if ((new_level) >= current_lock_level) { \ |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 975 | /* Do not use CHECKs or FATAL here, abort_lock_ is not setup yet. */ \ |
| 976 | fprintf(stderr, "New local level %d is not less than current level %d\n", \ |
| 977 | new_level, current_lock_level); \ |
| 978 | exit(1); \ |
| 979 | } \ |
Ian Rogers | f3d874c | 2014-07-17 18:52:42 -0700 | [diff] [blame] | 980 | current_lock_level = new_level; |
| 981 | |
| 982 | UPDATE_CURRENT_LOCK_LEVEL(kMutatorLock); |
| 983 | DCHECK(mutator_lock_ == nullptr); |
Yu Li | eac4424 | 2015-06-29 10:50:03 +0800 | [diff] [blame] | 984 | mutator_lock_ = new MutatorMutex("mutator lock", current_lock_level); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 985 | |
| 986 | UPDATE_CURRENT_LOCK_LEVEL(kHeapBitmapLock); |
| 987 | DCHECK(heap_bitmap_lock_ == nullptr); |
| 988 | heap_bitmap_lock_ = new ReaderWriterMutex("heap bitmap lock", current_lock_level); |
| 989 | |
Jeff Hao | 69dbec6 | 2014-09-15 18:03:41 -0700 | [diff] [blame] | 990 | UPDATE_CURRENT_LOCK_LEVEL(kTraceLock); |
| 991 | DCHECK(trace_lock_ == nullptr); |
| 992 | trace_lock_ = new Mutex("trace lock", current_lock_level); |
| 993 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 994 | UPDATE_CURRENT_LOCK_LEVEL(kRuntimeShutdownLock); |
| 995 | DCHECK(runtime_shutdown_lock_ == nullptr); |
| 996 | runtime_shutdown_lock_ = new Mutex("runtime shutdown lock", current_lock_level); |
| 997 | |
| 998 | UPDATE_CURRENT_LOCK_LEVEL(kProfilerLock); |
| 999 | DCHECK(profiler_lock_ == nullptr); |
| 1000 | profiler_lock_ = new Mutex("profiler lock", current_lock_level); |
| 1001 | |
Brian Carlstrom | 306db81 | 2014-09-05 13:01:41 -0700 | [diff] [blame] | 1002 | UPDATE_CURRENT_LOCK_LEVEL(kDeoptimizationLock); |
| 1003 | DCHECK(deoptimization_lock_ == nullptr); |
| 1004 | deoptimization_lock_ = new Mutex("Deoptimization lock", current_lock_level); |
| 1005 | |
| 1006 | UPDATE_CURRENT_LOCK_LEVEL(kAllocTrackerLock); |
| 1007 | DCHECK(alloc_tracker_lock_ == nullptr); |
| 1008 | alloc_tracker_lock_ = new Mutex("AllocTracker lock", current_lock_level); |
| 1009 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1010 | UPDATE_CURRENT_LOCK_LEVEL(kThreadListLock); |
| 1011 | DCHECK(thread_list_lock_ == nullptr); |
| 1012 | thread_list_lock_ = new Mutex("thread list lock", current_lock_level); |
| 1013 | |
Ian Rogers | 68d8b42 | 2014-07-17 11:09:10 -0700 | [diff] [blame] | 1014 | UPDATE_CURRENT_LOCK_LEVEL(kJniLoadLibraryLock); |
| 1015 | DCHECK(jni_libraries_lock_ == nullptr); |
| 1016 | jni_libraries_lock_ = new Mutex("JNI shared libraries map lock", current_lock_level); |
| 1017 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1018 | UPDATE_CURRENT_LOCK_LEVEL(kBreakpointLock); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1019 | DCHECK(breakpoint_lock_ == nullptr); |
Sebastien Hertz | ed2be17 | 2014-08-19 15:33:43 +0200 | [diff] [blame] | 1020 | breakpoint_lock_ = new ReaderWriterMutex("breakpoint lock", current_lock_level); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1021 | |
| 1022 | UPDATE_CURRENT_LOCK_LEVEL(kClassLinkerClassesLock); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1023 | DCHECK(classlinker_classes_lock_ == nullptr); |
| 1024 | classlinker_classes_lock_ = new ReaderWriterMutex("ClassLinker classes lock", |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1025 | current_lock_level); |
| 1026 | |
Andreas Gampe | 7424081 | 2014-04-17 10:35:09 -0700 | [diff] [blame] | 1027 | UPDATE_CURRENT_LOCK_LEVEL(kMonitorPoolLock); |
| 1028 | DCHECK(allocated_monitor_ids_lock_ == nullptr); |
| 1029 | allocated_monitor_ids_lock_ = new Mutex("allocated monitor ids lock", current_lock_level); |
| 1030 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1031 | UPDATE_CURRENT_LOCK_LEVEL(kAllocatedThreadIdsLock); |
| 1032 | DCHECK(allocated_thread_ids_lock_ == nullptr); |
| 1033 | allocated_thread_ids_lock_ = new Mutex("allocated thread ids lock", current_lock_level); |
| 1034 | |
Nicolas Geoffray | 7f0a6d6 | 2014-05-26 14:01:46 +0100 | [diff] [blame] | 1035 | if (kRuntimeISA == kX86 || kRuntimeISA == kX86_64) { |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1036 | UPDATE_CURRENT_LOCK_LEVEL(kModifyLdtLock); |
| 1037 | DCHECK(modify_ldt_lock_ == nullptr); |
| 1038 | modify_ldt_lock_ = new Mutex("modify_ldt lock", current_lock_level); |
| 1039 | } |
| 1040 | |
Mathieu Chartier | f9c6fc6 | 2015-10-07 11:44:05 -0700 | [diff] [blame] | 1041 | UPDATE_CURRENT_LOCK_LEVEL(kOatFileManagerLock); |
| 1042 | DCHECK(oat_file_manager_lock_ == nullptr); |
| 1043 | oat_file_manager_lock_ = new ReaderWriterMutex("OatFile manager lock", current_lock_level); |
| 1044 | |
Mathieu Chartier | e58991b | 2015-10-13 07:59:34 -0700 | [diff] [blame] | 1045 | UPDATE_CURRENT_LOCK_LEVEL(kOatFileCountLock); |
| 1046 | DCHECK(oat_file_count_lock_ == nullptr); |
| 1047 | oat_file_count_lock_ = new ReaderWriterMutex("OatFile count lock", current_lock_level); |
| 1048 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1049 | UPDATE_CURRENT_LOCK_LEVEL(kInternTableLock); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1050 | DCHECK(intern_table_lock_ == nullptr); |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1051 | intern_table_lock_ = new Mutex("InternTable lock", current_lock_level); |
| 1052 | |
Mathieu Chartier | a5a53ef | 2014-09-12 12:58:05 -0700 | [diff] [blame] | 1053 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceProcessorLock); |
| 1054 | DCHECK(reference_processor_lock_ == nullptr); |
| 1055 | reference_processor_lock_ = new Mutex("ReferenceProcessor lock", current_lock_level); |
| 1056 | |
| 1057 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueClearedReferencesLock); |
| 1058 | DCHECK(reference_queue_cleared_references_lock_ == nullptr); |
| 1059 | reference_queue_cleared_references_lock_ = new Mutex("ReferenceQueue cleared references lock", current_lock_level); |
| 1060 | |
| 1061 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueWeakReferencesLock); |
| 1062 | DCHECK(reference_queue_weak_references_lock_ == nullptr); |
| 1063 | reference_queue_weak_references_lock_ = new Mutex("ReferenceQueue cleared references lock", current_lock_level); |
| 1064 | |
| 1065 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueFinalizerReferencesLock); |
| 1066 | DCHECK(reference_queue_finalizer_references_lock_ == nullptr); |
| 1067 | reference_queue_finalizer_references_lock_ = new Mutex("ReferenceQueue finalizer references lock", current_lock_level); |
| 1068 | |
| 1069 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueuePhantomReferencesLock); |
| 1070 | DCHECK(reference_queue_phantom_references_lock_ == nullptr); |
| 1071 | reference_queue_phantom_references_lock_ = new Mutex("ReferenceQueue phantom references lock", current_lock_level); |
| 1072 | |
| 1073 | UPDATE_CURRENT_LOCK_LEVEL(kReferenceQueueSoftReferencesLock); |
| 1074 | DCHECK(reference_queue_soft_references_lock_ == nullptr); |
| 1075 | reference_queue_soft_references_lock_ = new Mutex("ReferenceQueue soft references lock", current_lock_level); |
| 1076 | |
Igor Murashkin | e2facc5 | 2015-07-10 13:49:08 -0700 | [diff] [blame] | 1077 | UPDATE_CURRENT_LOCK_LEVEL(kLambdaTableLock); |
| 1078 | DCHECK(lambda_table_lock_ == nullptr); |
| 1079 | lambda_table_lock_ = new Mutex("lambda table lock", current_lock_level); |
| 1080 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1081 | UPDATE_CURRENT_LOCK_LEVEL(kAbortLock); |
| 1082 | DCHECK(abort_lock_ == nullptr); |
| 1083 | abort_lock_ = new Mutex("abort lock", current_lock_level, true); |
| 1084 | |
| 1085 | UPDATE_CURRENT_LOCK_LEVEL(kThreadSuspendCountLock); |
| 1086 | DCHECK(thread_suspend_count_lock_ == nullptr); |
| 1087 | thread_suspend_count_lock_ = new Mutex("thread suspend count lock", current_lock_level); |
| 1088 | |
| 1089 | UPDATE_CURRENT_LOCK_LEVEL(kUnexpectedSignalLock); |
| 1090 | DCHECK(unexpected_signal_lock_ == nullptr); |
| 1091 | unexpected_signal_lock_ = new Mutex("unexpected signal lock", current_lock_level, true); |
| 1092 | |
Hiroshi Yamauchi | 3eed93d | 2014-06-04 11:43:59 -0700 | [diff] [blame] | 1093 | UPDATE_CURRENT_LOCK_LEVEL(kMemMapsLock); |
| 1094 | DCHECK(mem_maps_lock_ == nullptr); |
| 1095 | mem_maps_lock_ = new Mutex("mem maps lock", current_lock_level); |
| 1096 | |
Chao-ying Fu | 9e36931 | 2014-05-21 11:20:52 -0700 | [diff] [blame] | 1097 | UPDATE_CURRENT_LOCK_LEVEL(kLoggingLock); |
| 1098 | DCHECK(logging_lock_ == nullptr); |
| 1099 | logging_lock_ = new Mutex("logging lock", current_lock_level, true); |
| 1100 | |
| 1101 | #undef UPDATE_CURRENT_LOCK_LEVEL |
Mathieu Chartier | 91e5669 | 2015-03-03 13:51:04 -0800 | [diff] [blame] | 1102 | |
| 1103 | InitConditions(); |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1104 | } |
| 1105 | } |
| 1106 | |
Mathieu Chartier | 91e5669 | 2015-03-03 13:51:04 -0800 | [diff] [blame] | 1107 | void Locks::InitConditions() { |
| 1108 | thread_exit_cond_ = new ConditionVariable("thread exit condition variable", *thread_list_lock_); |
| 1109 | } |
Ian Rogers | 719d1a3 | 2014-03-06 12:13:39 -0800 | [diff] [blame] | 1110 | |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 1111 | } // namespace art |