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 | |
Elliott Hughes | 07ed66b | 2012-12-12 18:34:25 -0800 | [diff] [blame] | 22 | #include "base/logging.h" |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 23 | #include "cutils/atomic.h" |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame^] | 24 | #include "cutils/atomic-inline.h" |
| 25 | #include "mutex-inl.h" |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 26 | #include "runtime.h" |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 27 | #include "scoped_thread_state_change.h" |
Elliott Hughes | ffb465f | 2012-03-01 18:46:05 -0800 | [diff] [blame] | 28 | #include "thread.h" |
| 29 | #include "utils.h" |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 30 | |
| 31 | namespace art { |
| 32 | |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 33 | // This works on Mac OS 10.6 but hasn't been tested on older releases. |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 34 | struct __attribute__((__may_alias__)) darwin_pthread_mutex_t { |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 35 | long padding0; |
| 36 | int padding1; |
| 37 | uint32_t padding2; |
| 38 | int16_t padding3; |
| 39 | int16_t padding4; |
| 40 | uint32_t padding5; |
| 41 | pthread_t darwin_pthread_mutex_owner; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 42 | // ...other stuff we don't care about. |
| 43 | }; |
| 44 | |
| 45 | struct __attribute__((__may_alias__)) darwin_pthread_rwlock_t { |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 46 | long padding0; |
| 47 | pthread_mutex_t padding1; |
| 48 | int padding2; |
| 49 | pthread_cond_t padding3; |
| 50 | pthread_cond_t padding4; |
| 51 | int padding5; |
| 52 | int padding6; |
| 53 | pthread_t darwin_pthread_rwlock_owner; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 54 | // ...other stuff we don't care about. |
| 55 | }; |
| 56 | |
| 57 | struct __attribute__((__may_alias__)) glibc_pthread_mutex_t { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 58 | int32_t padding0[2]; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 59 | int owner; |
| 60 | // ...other stuff we don't care about. |
| 61 | }; |
| 62 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 63 | struct __attribute__((__may_alias__)) glibc_pthread_rwlock_t { |
| 64 | #ifdef __LP64__ |
| 65 | int32_t padding0[6]; |
| 66 | #else |
| 67 | int32_t padding0[7]; |
| 68 | #endif |
| 69 | int writer; |
| 70 | // ...other stuff we don't care about. |
| 71 | }; |
| 72 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 73 | #if ART_USE_FUTEXES |
| 74 | static bool ComputeRelativeTimeSpec(timespec* result_ts, const timespec& lhs, const timespec& rhs) { |
| 75 | const long int one_sec = 1000 * 1000 * 1000; // one second in nanoseconds. |
| 76 | result_ts->tv_sec = lhs.tv_sec - rhs.tv_sec; |
| 77 | result_ts->tv_nsec = lhs.tv_nsec - rhs.tv_nsec; |
| 78 | if (result_ts->tv_nsec < 0) { |
| 79 | result_ts->tv_sec--; |
| 80 | result_ts->tv_nsec += one_sec; |
| 81 | } else if (result_ts->tv_nsec > one_sec) { |
| 82 | result_ts->tv_sec++; |
| 83 | result_ts->tv_nsec -= one_sec; |
| 84 | } |
| 85 | return result_ts->tv_sec < 0; |
| 86 | } |
| 87 | #endif |
| 88 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 89 | #if CONTENTION_LOGGING |
| 90 | // A guard for all_mutexes_ that's not a mutex (Mutexes must CAS to acquire and busy wait). |
| 91 | static AtomicInteger all_mutexes_guard_; |
| 92 | // All created mutexes guarded by all_mutexes_guard_. |
| 93 | std::set<BaseMutex*>* all_mutexes_; |
| 94 | |
| 95 | class ScopedAllMutexesLock { |
| 96 | public: |
| 97 | ScopedAllMutexesLock(const BaseMutex* mutex) : mutex_(mutex) { |
| 98 | while (!all_mutexes_guard_.CompareAndSwap(0, reinterpret_cast<int32_t>(mutex))) { |
| 99 | NanoSleep(100); |
| 100 | } |
| 101 | } |
| 102 | ~ScopedAllMutexesLock() { |
| 103 | while (!all_mutexes_guard_.CompareAndSwap(reinterpret_cast<int32_t>(mutex_), 0)) { |
| 104 | NanoSleep(100); |
| 105 | } |
| 106 | } |
| 107 | private: |
| 108 | const BaseMutex* const mutex_; |
| 109 | }; |
| 110 | #endif |
| 111 | |
| 112 | BaseMutex::BaseMutex(const char* name, LockLevel level) : level_(level), name_(name) { |
| 113 | #if CONTENTION_LOGGING |
| 114 | ScopedAllMutexesLock mu(this); |
| 115 | if (all_mutexes_ == NULL) { |
| 116 | // We leak the global set of all mutexes to avoid ordering issues in global variable |
| 117 | // construction/destruction. |
| 118 | all_mutexes_ = new std::set<BaseMutex*>(); |
| 119 | } |
| 120 | all_mutexes_->insert(this); |
| 121 | #endif |
| 122 | } |
| 123 | |
| 124 | BaseMutex::~BaseMutex() { |
| 125 | #if CONTENTION_LOGGING |
| 126 | ScopedAllMutexesLock mu(this); |
| 127 | all_mutexes_->erase(this); |
| 128 | #endif |
| 129 | } |
| 130 | |
| 131 | void BaseMutex::DumpAll(std::ostream& os) { |
| 132 | #if CONTENTION_LOGGING |
| 133 | os << "Mutex logging:\n"; |
| 134 | ScopedAllMutexesLock mu(reinterpret_cast<const BaseMutex*>(-1)); |
| 135 | typedef std::set<BaseMutex*>::const_iterator It; |
| 136 | for (It it = all_mutexes_->begin(); it != all_mutexes_->end(); ++it) { |
| 137 | BaseMutex* mutex = *it; |
| 138 | mutex->Dump(os); |
| 139 | os << "\n"; |
| 140 | } |
| 141 | #endif |
| 142 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 143 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 144 | void BaseMutex::RegisterAsLocked(Thread* self) { |
| 145 | if (UNLIKELY(self == NULL)) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 146 | CheckUnattachedThread(level_); |
| 147 | return; |
| 148 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 149 | if (kDebugLocking) { |
| 150 | // Check if a bad Mutex of this level or lower is held. |
| 151 | bool bad_mutexes_held = false; |
| 152 | for (int i = level_; i >= 0; --i) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 153 | BaseMutex* held_mutex = self->GetHeldMutex(static_cast<LockLevel>(i)); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 154 | if (UNLIKELY(held_mutex != NULL)) { |
| 155 | LOG(ERROR) << "Lock level violation: holding \"" << held_mutex->name_ << "\" (level " << i |
| 156 | << ") while locking \"" << name_ << "\" (level " << static_cast<int>(level_) << ")"; |
| 157 | if (i > kAbortLock) { |
| 158 | // Only abort in the check below if this is more than abort level lock. |
| 159 | bad_mutexes_held = true; |
| 160 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 161 | } |
| 162 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 163 | CHECK(!bad_mutexes_held); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 164 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 165 | // Don't record monitors as they are outside the scope of analysis. They may be inspected off of |
| 166 | // the monitor list. |
| 167 | if (level_ != kMonitorLock) { |
| 168 | self->SetHeldMutex(level_, this); |
| 169 | } |
| 170 | } |
| 171 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 172 | void BaseMutex::CheckSafeToWait(Thread* self) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 173 | if (self == NULL) { |
| 174 | CheckUnattachedThread(level_); |
| 175 | return; |
| 176 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 177 | if (kDebugLocking) { |
| 178 | CHECK(self->GetHeldMutex(level_) == this) << "Waiting on unacquired mutex: " << name_; |
| 179 | bool bad_mutexes_held = false; |
| 180 | for (int i = kMaxMutexLevel; i >= 0; --i) { |
| 181 | if (i != level_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 182 | BaseMutex* held_mutex = self->GetHeldMutex(static_cast<LockLevel>(i)); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 183 | if (held_mutex != NULL) { |
| 184 | LOG(ERROR) << "Holding " << held_mutex->name_ << " (level " << i |
| 185 | << ") while performing wait on: " |
| 186 | << name_ << " (level " << static_cast<int>(level_) << ")"; |
| 187 | bad_mutexes_held = true; |
| 188 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 189 | } |
| 190 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 191 | CHECK(!bad_mutexes_held); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 192 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 193 | } |
| 194 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 195 | void BaseMutex::RecordContention(uint64_t blocked_tid, uint64_t owner_tid, uint64_t milli_time_blocked) { |
| 196 | #if CONTENTION_LOGGING |
| 197 | ++contention_count_; |
| 198 | wait_time_ += static_cast<uint32_t>(milli_time_blocked); // May overflow. |
| 199 | // This code is intentionally racy as it is only used for diagnostics. |
| 200 | uint32_t slot = cur_content_log_entry_; |
| 201 | if (contention_log_[slot].blocked_tid == blocked_tid && |
| 202 | contention_log_[slot].owner_tid == blocked_tid) { |
| 203 | ++contention_log_[slot].count; |
| 204 | } else { |
| 205 | uint32_t new_slot; |
| 206 | do { |
| 207 | slot = cur_content_log_entry_; |
| 208 | new_slot = (slot + 1) % kContentionLogSize; |
| 209 | } while(!cur_content_log_entry_.CompareAndSwap(slot, new_slot)); |
| 210 | contention_log_[new_slot].blocked_tid = blocked_tid; |
| 211 | contention_log_[new_slot].owner_tid = owner_tid; |
| 212 | contention_log_[new_slot].count = 1; |
| 213 | } |
| 214 | #endif |
| 215 | } |
| 216 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 217 | void BaseMutex::DumpContention(std::ostream& os) const { |
| 218 | #if CONTENTION_LOGGING |
| 219 | uint32_t wait_time = wait_time_; |
| 220 | uint32_t contention_count = contention_count_; |
| 221 | if (contention_count == 0) { |
| 222 | os << "never contended"; |
| 223 | } else { |
| 224 | os << "contended " << contention_count << " times, average wait of contender " << (wait_time / contention_count) << "ms"; |
| 225 | SafeMap<uint64_t, size_t> most_common_blocker; |
| 226 | SafeMap<uint64_t, size_t> most_common_blocked; |
| 227 | typedef SafeMap<uint64_t, size_t>::const_iterator It; |
| 228 | for (size_t i = 0; i < kContentionLogSize; ++i) { |
| 229 | uint64_t blocked_tid = contention_log_[i].blocked_tid; |
| 230 | uint64_t owner_tid = contention_log_[i].owner_tid; |
| 231 | uint32_t count = contention_log_[i].count; |
| 232 | if (count > 0) { |
| 233 | It it = most_common_blocked.find(blocked_tid); |
| 234 | if (it != most_common_blocked.end()) { |
| 235 | most_common_blocked.Overwrite(blocked_tid, it->second + count); |
| 236 | } else { |
| 237 | most_common_blocked.Put(blocked_tid, count); |
| 238 | } |
| 239 | it = most_common_blocker.find(owner_tid); |
| 240 | if (it != most_common_blocker.end()) { |
| 241 | most_common_blocker.Overwrite(owner_tid, it->second + count); |
| 242 | } else { |
| 243 | most_common_blocker.Put(owner_tid, count); |
| 244 | } |
| 245 | } |
| 246 | } |
| 247 | uint64_t max_tid = 0; |
| 248 | size_t max_tid_count = 0; |
| 249 | for (It it = most_common_blocked.begin(); it != most_common_blocked.end(); ++it) { |
| 250 | if (it->second > max_tid_count) { |
| 251 | max_tid = it->first; |
| 252 | max_tid_count = it->second; |
| 253 | } |
| 254 | } |
| 255 | if (max_tid != 0) { |
| 256 | os << " sample shows most blocked tid=" << max_tid; |
| 257 | } |
| 258 | max_tid = 0; |
| 259 | max_tid_count = 0; |
| 260 | for (It it = most_common_blocker.begin(); it != most_common_blocker.end(); ++it) { |
| 261 | if (it->second > max_tid_count) { |
| 262 | max_tid = it->first; |
| 263 | max_tid_count = it->second; |
| 264 | } |
| 265 | } |
| 266 | if (max_tid != 0) { |
| 267 | os << " sample shows tid=" << max_tid << " owning during this time"; |
| 268 | } |
| 269 | } |
| 270 | #endif |
| 271 | } |
| 272 | |
| 273 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 274 | Mutex::Mutex(const char* name, LockLevel level, bool recursive) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 275 | : BaseMutex(name, level), recursive_(recursive), recursion_count_(0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 276 | #if ART_USE_FUTEXES |
| 277 | state_ = 0; |
| 278 | exclusive_owner_ = 0; |
| 279 | num_contenders_ = 0; |
| 280 | #elif defined(__BIONIC__) || defined(__APPLE__) |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 281 | // Use recursive mutexes for bionic and Apple otherwise the |
| 282 | // non-recursive mutexes don't have TIDs to check lock ownership of. |
Elliott Hughes | bbd9d83 | 2011-11-07 14:40:00 -0800 | [diff] [blame] | 283 | pthread_mutexattr_t attributes; |
| 284 | CHECK_MUTEX_CALL(pthread_mutexattr_init, (&attributes)); |
| 285 | CHECK_MUTEX_CALL(pthread_mutexattr_settype, (&attributes, PTHREAD_MUTEX_RECURSIVE)); |
| 286 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, &attributes)); |
| 287 | CHECK_MUTEX_CALL(pthread_mutexattr_destroy, (&attributes)); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 288 | #else |
| 289 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, NULL)); |
| 290 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 291 | } |
| 292 | |
| 293 | Mutex::~Mutex() { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 294 | #if ART_USE_FUTEXES |
| 295 | if (state_ != 0) { |
| 296 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
| 297 | Runtime* runtime = Runtime::Current(); |
| 298 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDown(); |
| 299 | LOG(shutting_down ? WARNING : FATAL) << "destroying mutex with owner: " << exclusive_owner_; |
| 300 | } else { |
| 301 | CHECK_EQ(exclusive_owner_, 0U) << "unexpectedly found an owner on unlocked mutex " << name_; |
| 302 | CHECK_EQ(num_contenders_, 0) << "unexpectedly found a contender on mutex " << name_; |
| 303 | } |
| 304 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 305 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 306 | // may still be using locks. |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 307 | int rc = pthread_mutex_destroy(&mutex_); |
| 308 | if (rc != 0) { |
| 309 | errno = rc; |
Elliott Hughes | b3bd5f0 | 2012-03-08 21:05:27 -0800 | [diff] [blame] | 310 | // 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] | 311 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 312 | Runtime* runtime = Runtime::Current(); |
| 313 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDown(); |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 314 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_mutex_destroy failed for " << name_; |
| 315 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 316 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 317 | } |
| 318 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 319 | void Mutex::ExclusiveLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 320 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 321 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 322 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 323 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 324 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 325 | #if ART_USE_FUTEXES |
| 326 | bool done = false; |
| 327 | do { |
| 328 | int32_t cur_state = state_; |
| 329 | if (cur_state == 0) { |
| 330 | // Change state from 0 to 1. |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame^] | 331 | done = android_atomic_acquire_cas(0, 1, &state_) == 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 332 | } else { |
| 333 | // Failed to acquire, hang up. |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 334 | ScopedContentionRecorder scr(this, GetExclusiveOwnerTid(), SafeGetTid(self)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 335 | android_atomic_inc(&num_contenders_); |
| 336 | if (futex(&state_, FUTEX_WAIT, 1, NULL, NULL, 0) != 0) { |
| 337 | if (errno != EAGAIN) { |
| 338 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 339 | } |
| 340 | } |
| 341 | android_atomic_dec(&num_contenders_); |
| 342 | } |
| 343 | } while(!done); |
| 344 | DCHECK_EQ(state_, 1); |
| 345 | exclusive_owner_ = SafeGetTid(self); |
| 346 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 347 | CHECK_MUTEX_CALL(pthread_mutex_lock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 348 | #endif |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 349 | RegisterAsLocked(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 350 | } |
| 351 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 352 | if (kDebugLocking) { |
| 353 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 354 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 355 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 356 | } |
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 | bool Mutex::ExclusiveTryLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 360 | DCHECK(self == NULL || 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 { |
| 368 | int32_t cur_state = state_; |
| 369 | if (cur_state == 0) { |
| 370 | // Change state from 0 to 1. |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame^] | 371 | done = android_atomic_acquire_cas(0, 1, &state_) == 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 372 | } else { |
| 373 | return false; |
| 374 | } |
| 375 | } while(!done); |
| 376 | DCHECK_EQ(state_, 1); |
| 377 | exclusive_owner_ = SafeGetTid(self); |
| 378 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 379 | int result = pthread_mutex_trylock(&mutex_); |
| 380 | if (result == EBUSY) { |
| 381 | return false; |
| 382 | } |
| 383 | if (result != 0) { |
| 384 | errno = result; |
| 385 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 386 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 387 | #endif |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 388 | RegisterAsLocked(self); |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 389 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 390 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 391 | if (kDebugLocking) { |
| 392 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 393 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 394 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 395 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 396 | return true; |
| 397 | } |
| 398 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 399 | void Mutex::ExclusiveUnlock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 400 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 401 | AssertHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 402 | recursion_count_--; |
| 403 | if (!recursive_ || recursion_count_ == 0) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 404 | if (kDebugLocking) { |
| 405 | CHECK(recursion_count_ == 0 || recursive_) << "Unexpected recursion count on mutex: " |
| 406 | << name_ << " " << recursion_count_; |
| 407 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 408 | RegisterAsUnlocked(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 409 | #if ART_USE_FUTEXES |
| 410 | bool done = false; |
| 411 | do { |
| 412 | int32_t cur_state = state_; |
| 413 | if (cur_state == 1) { |
| 414 | // We're no longer the owner. |
| 415 | exclusive_owner_ = 0; |
| 416 | // Change state to 0. |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame^] | 417 | done = android_atomic_release_cas(cur_state, 0, &state_) == 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 418 | if (done) { // Spurious fail? |
| 419 | // Wake a contender |
| 420 | if (num_contenders_ > 0) { |
| 421 | futex(&state_, FUTEX_WAKE, 1, NULL, NULL, 0); |
| 422 | } |
| 423 | } |
| 424 | } else { |
| 425 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 426 | } |
| 427 | } while(!done); |
| 428 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 429 | CHECK_MUTEX_CALL(pthread_mutex_unlock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 430 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 431 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 432 | } |
| 433 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 434 | bool Mutex::IsExclusiveHeld(const Thread* self) const { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 435 | DCHECK(self == NULL || self == Thread::Current()); |
| 436 | bool result = (GetExclusiveOwnerTid() == SafeGetTid(self)); |
| 437 | if (kDebugLocking) { |
| 438 | // Sanity debug check that if we think it is locked we have it in our held mutexes. |
Brian Carlstrom | 9e419ca | 2012-11-27 11:31:49 -0800 | [diff] [blame] | 439 | if (result && self != NULL && level_ != kMonitorLock && !gAborting) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 440 | CHECK_EQ(self->GetHeldMutex(level_), this); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 441 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 442 | } |
| 443 | return result; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 444 | } |
| 445 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 446 | uint64_t Mutex::GetExclusiveOwnerTid() const { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 447 | #if ART_USE_FUTEXES |
| 448 | return exclusive_owner_; |
| 449 | #elif defined(__BIONIC__) |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 450 | return static_cast<uint64_t>((mutex_.value >> 16) & 0xffff); |
Elliott Hughes | 3147a23 | 2011-10-12 15:55:07 -0700 | [diff] [blame] | 451 | #elif defined(__GLIBC__) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 452 | return reinterpret_cast<const glibc_pthread_mutex_t*>(&mutex_)->owner; |
Elliott Hughes | cf04431 | 2012-01-23 18:48:51 -0800 | [diff] [blame] | 453 | #elif defined(__APPLE__) |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 454 | const darwin_pthread_mutex_t* dpmutex = reinterpret_cast<const darwin_pthread_mutex_t*>(&mutex_); |
| 455 | pthread_t owner = dpmutex->darwin_pthread_mutex_owner; |
Brian Carlstrom | bd93c30 | 2012-08-27 16:58:28 -0700 | [diff] [blame] | 456 | // 0 for unowned, -1 for PTHREAD_MTX_TID_SWITCHING |
| 457 | // TODO: should we make darwin_pthread_mutex_owner volatile and recheck until not -1? |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 458 | if ((owner == (pthread_t)0) || (owner == (pthread_t)-1)) { |
| 459 | return 0; |
| 460 | } |
| 461 | uint64_t tid; |
| 462 | CHECK_PTHREAD_CALL(pthread_threadid_np, (owner, &tid), __FUNCTION__); // Requires Mac OS 10.6 |
| 463 | return tid; |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 464 | #else |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 465 | #error unsupported C library |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 466 | #endif |
| 467 | } |
| 468 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 469 | void Mutex::Dump(std::ostream& os) const { |
| 470 | os << (recursive_ ? "recursive " : "non-recursive ") |
| 471 | << name_ |
| 472 | << " level=" << static_cast<int>(level_) |
| 473 | << " rec=" << recursion_count_ |
| 474 | << " owner=" << GetExclusiveOwnerTid() << " "; |
| 475 | DumpContention(os); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 476 | } |
| 477 | |
| 478 | std::ostream& operator<<(std::ostream& os, const Mutex& mu) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 479 | mu.Dump(os); |
| 480 | return os; |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 483 | ReaderWriterMutex::ReaderWriterMutex(const char* name, LockLevel level) : |
| 484 | BaseMutex(name, level) |
| 485 | #if ART_USE_FUTEXES |
| 486 | , state_(0), exclusive_owner_(0), num_pending_readers_(0), num_pending_writers_(0) |
| 487 | #endif |
| 488 | { |
| 489 | #if !ART_USE_FUTEXES |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 490 | CHECK_MUTEX_CALL(pthread_rwlock_init, (&rwlock_, NULL)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 491 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 492 | } |
| 493 | |
| 494 | ReaderWriterMutex::~ReaderWriterMutex() { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 495 | #if ART_USE_FUTEXES |
| 496 | CHECK_EQ(state_, 0); |
| 497 | CHECK_EQ(exclusive_owner_, 0U); |
| 498 | CHECK_EQ(num_pending_readers_, 0); |
| 499 | CHECK_EQ(num_pending_writers_, 0); |
| 500 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 501 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 502 | // may still be using locks. |
| 503 | int rc = pthread_rwlock_destroy(&rwlock_); |
| 504 | if (rc != 0) { |
| 505 | errno = rc; |
| 506 | // 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] | 507 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 508 | Runtime* runtime = Runtime::Current(); |
| 509 | bool shutting_down = runtime == NULL || runtime->IsShuttingDown(); |
| 510 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_rwlock_destroy failed for " << name_; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 511 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 512 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 513 | } |
| 514 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 515 | void ReaderWriterMutex::ExclusiveLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 516 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 517 | AssertNotExclusiveHeld(self); |
| 518 | #if ART_USE_FUTEXES |
| 519 | bool done = false; |
| 520 | do { |
| 521 | int32_t cur_state = state_; |
| 522 | if (cur_state == 0) { |
| 523 | // Change state from 0 to -1. |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame^] | 524 | done = android_atomic_acquire_cas(0, -1, &state_) == 0; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 525 | } else { |
| 526 | // Failed to acquire, hang up. |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 527 | ScopedContentionRecorder scr(this, GetExclusiveOwnerTid(), SafeGetTid(self)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 528 | android_atomic_inc(&num_pending_writers_); |
| 529 | if (futex(&state_, FUTEX_WAIT, cur_state, NULL, NULL, 0) != 0) { |
| 530 | if (errno != EAGAIN) { |
| 531 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 532 | } |
| 533 | } |
| 534 | android_atomic_dec(&num_pending_writers_); |
| 535 | } |
| 536 | } while(!done); |
Ian Rogers | ab47016 | 2012-09-29 23:06:53 -0700 | [diff] [blame] | 537 | DCHECK_EQ(state_, -1); |
| 538 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 539 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 540 | CHECK_MUTEX_CALL(pthread_rwlock_wrlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 541 | #endif |
| 542 | RegisterAsLocked(self); |
| 543 | AssertExclusiveHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 544 | } |
| 545 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 546 | void ReaderWriterMutex::ExclusiveUnlock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 547 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 548 | AssertExclusiveHeld(self); |
| 549 | RegisterAsUnlocked(self); |
| 550 | #if ART_USE_FUTEXES |
| 551 | bool done = false; |
| 552 | do { |
| 553 | int32_t cur_state = state_; |
| 554 | if (cur_state == -1) { |
| 555 | // We're no longer the owner. |
| 556 | exclusive_owner_ = 0; |
| 557 | // Change state from -1 to 0. |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame^] | 558 | done = android_atomic_release_cas(-1, 0, &state_) == 0; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 559 | if (done) { // cmpxchg may fail due to noise? |
| 560 | // Wake any waiters. |
| 561 | if (num_pending_readers_ > 0 || num_pending_writers_ > 0) { |
| 562 | futex(&state_, FUTEX_WAKE, -1, NULL, NULL, 0); |
| 563 | } |
| 564 | } |
| 565 | } else { |
| 566 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 567 | } |
| 568 | } while(!done); |
| 569 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 570 | CHECK_MUTEX_CALL(pthread_rwlock_unlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 571 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 572 | } |
| 573 | |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 574 | #if HAVE_TIMED_RWLOCK |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 575 | bool ReaderWriterMutex::ExclusiveLockWithTimeout(Thread* self, int64_t ms, int32_t ns) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 576 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 577 | #if ART_USE_FUTEXES |
| 578 | bool done = false; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 579 | timespec end_abs_ts; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 580 | InitTimeSpec(true, CLOCK_REALTIME, ms, ns, &end_abs_ts); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 581 | do { |
| 582 | int32_t cur_state = state_; |
| 583 | if (cur_state == 0) { |
| 584 | // Change state from 0 to -1. |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame^] | 585 | done = android_atomic_acquire_cas(0, -1, &state_) == 0; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 586 | } else { |
| 587 | // Failed to acquire, hang up. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 588 | timespec now_abs_ts; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 589 | InitTimeSpec(true, CLOCK_REALTIME, 0, 0, &now_abs_ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 590 | timespec rel_ts; |
| 591 | if (ComputeRelativeTimeSpec(&rel_ts, end_abs_ts, now_abs_ts)) { |
| 592 | return false; // Timed out. |
| 593 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 594 | ScopedContentionRecorder scr(this, GetExclusiveOwnerTid(), SafeGetTid(self)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 595 | android_atomic_inc(&num_pending_writers_); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 596 | if (futex(&state_, FUTEX_WAIT, cur_state, &rel_ts, NULL, 0) != 0) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 597 | if (errno == ETIMEDOUT) { |
| 598 | android_atomic_dec(&num_pending_writers_); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 599 | return false; // Timed out. |
| 600 | } else if (errno != EAGAIN && errno != EINTR) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 601 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 602 | } |
| 603 | } |
| 604 | android_atomic_dec(&num_pending_writers_); |
| 605 | } |
| 606 | } while(!done); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 607 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 608 | #else |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 609 | timespec ts; |
Brian Carlstrom | bcc2926 | 2012-11-02 11:36:03 -0700 | [diff] [blame] | 610 | InitTimeSpec(true, CLOCK_REALTIME, ms, ns, &ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 611 | int result = pthread_rwlock_timedwrlock(&rwlock_, &ts); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 612 | if (result == ETIMEDOUT) { |
| 613 | return false; |
| 614 | } |
| 615 | if (result != 0) { |
| 616 | errno = result; |
Ian Rogers | a5acfd3 | 2012-08-15 11:50:10 -0700 | [diff] [blame] | 617 | PLOG(FATAL) << "pthread_rwlock_timedwrlock failed for " << name_; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 618 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 619 | #endif |
| 620 | RegisterAsLocked(self); |
| 621 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 622 | return true; |
| 623 | } |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 624 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 625 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 626 | bool ReaderWriterMutex::SharedTryLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 627 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 628 | #if ART_USE_FUTEXES |
| 629 | bool done = false; |
| 630 | do { |
| 631 | int32_t cur_state = state_; |
| 632 | if (cur_state >= 0) { |
| 633 | // Add as an extra reader. |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame^] | 634 | done = android_atomic_acquire_cas(cur_state, cur_state + 1, &state_) == 0; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 635 | } else { |
| 636 | // Owner holds it exclusively. |
| 637 | return false; |
| 638 | } |
| 639 | } while(!done); |
| 640 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 641 | int result = pthread_rwlock_tryrdlock(&rwlock_); |
| 642 | if (result == EBUSY) { |
| 643 | return false; |
| 644 | } |
| 645 | if (result != 0) { |
| 646 | errno = result; |
| 647 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 648 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 649 | #endif |
| 650 | RegisterAsLocked(self); |
| 651 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 652 | return true; |
| 653 | } |
| 654 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 655 | bool ReaderWriterMutex::IsExclusiveHeld(const Thread* self) const { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 656 | DCHECK(self == NULL || self == Thread::Current()); |
| 657 | bool result = (GetExclusiveOwnerTid() == SafeGetTid(self)); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 658 | if (kDebugLocking) { |
| 659 | // Sanity that if the pthread thinks we own the lock the Thread agrees. |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 660 | if (self != NULL && result) { |
| 661 | CHECK_EQ(self->GetHeldMutex(level_), this); |
| 662 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 663 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 664 | return result; |
| 665 | } |
| 666 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 667 | bool ReaderWriterMutex::IsSharedHeld(const Thread* self) const { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 668 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 669 | bool result; |
| 670 | if (UNLIKELY(self == NULL)) { // Handle unattached threads. |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 671 | result = IsExclusiveHeld(self); // TODO: a better best effort here. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 672 | } else { |
| 673 | result = (self->GetHeldMutex(level_) == this); |
| 674 | } |
| 675 | return result; |
| 676 | } |
| 677 | |
| 678 | uint64_t ReaderWriterMutex::GetExclusiveOwnerTid() const { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 679 | #if ART_USE_FUTEXES |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 680 | int32_t state = state_; |
| 681 | if (state == 0) { |
| 682 | return 0; // No owner. |
| 683 | } else if (state > 0) { |
| 684 | return -1; // Shared. |
| 685 | } else { |
| 686 | return exclusive_owner_; |
| 687 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 688 | #else |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 689 | #if defined(__BIONIC__) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 690 | return rwlock_.writerThreadId; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 691 | #elif defined(__GLIBC__) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 692 | return reinterpret_cast<const glibc_pthread_rwlock_t*>(&rwlock_)->writer; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 693 | #elif defined(__APPLE__) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 694 | const darwin_pthread_rwlock_t* |
| 695 | dprwlock = reinterpret_cast<const darwin_pthread_rwlock_t*>(&rwlock_); |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 696 | pthread_t owner = dprwlock->darwin_pthread_rwlock_owner; |
| 697 | if (owner == (pthread_t)0) { |
| 698 | return 0; |
| 699 | } |
| 700 | uint64_t tid; |
| 701 | CHECK_PTHREAD_CALL(pthread_threadid_np, (owner, &tid), __FUNCTION__); // Requires Mac OS 10.6 |
| 702 | return tid; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 703 | #else |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 704 | #error unsupported C library |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 705 | #endif |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 706 | #endif |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 707 | } |
| 708 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 709 | void ReaderWriterMutex::Dump(std::ostream& os) const { |
| 710 | os << name_ |
| 711 | << " level=" << static_cast<int>(level_) |
| 712 | << " owner=" << GetExclusiveOwnerTid() << " "; |
| 713 | DumpContention(os); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 714 | } |
| 715 | |
| 716 | std::ostream& operator<<(std::ostream& os, const ReaderWriterMutex& mu) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 717 | mu.Dump(os); |
| 718 | return os; |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 719 | } |
| 720 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 721 | ConditionVariable::ConditionVariable(const std::string& name, Mutex& guard) |
| 722 | : name_(name), guard_(guard) { |
| 723 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 724 | sequence_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 725 | num_waiters_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 726 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 727 | CHECK_MUTEX_CALL(pthread_cond_init, (&cond_, NULL)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 728 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 729 | } |
| 730 | |
| 731 | ConditionVariable::~ConditionVariable() { |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 732 | #if ART_USE_FUTEXES |
| 733 | if (num_waiters_!= 0) { |
| 734 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
| 735 | Runtime* runtime = Runtime::Current(); |
| 736 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDown(); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 737 | LOG(shutting_down ? WARNING : FATAL) << "ConditionVariable::~ConditionVariable for " << name_ |
| 738 | << " called with " << num_waiters_ << " waiters."; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 739 | } |
| 740 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 741 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 742 | // may still be using condition variables. |
| 743 | int rc = pthread_cond_destroy(&cond_); |
| 744 | if (rc != 0) { |
| 745 | errno = rc; |
Ian Rogers | 50b35e2 | 2012-10-04 10:09:15 -0700 | [diff] [blame] | 746 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 747 | Runtime* runtime = Runtime::Current(); |
| 748 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDown(); |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 749 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_cond_destroy failed for " << name_; |
| 750 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 751 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 752 | } |
| 753 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 754 | void ConditionVariable::Broadcast(Thread* self) { |
| 755 | DCHECK(self == NULL || self == Thread::Current()); |
| 756 | // TODO: enable below, there's a race in thread creation that causes false failures currently. |
| 757 | // guard_.AssertExclusiveHeld(self); |
Mathieu Chartier | e46cd75 | 2012-10-31 16:56:18 -0700 | [diff] [blame] | 758 | DCHECK_EQ(guard_.GetExclusiveOwnerTid(), SafeGetTid(self)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 759 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 760 | if (num_waiters_ > 0) { |
| 761 | android_atomic_inc(&sequence_); // Indicate the broadcast occurred. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 762 | bool done = false; |
| 763 | do { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 764 | int32_t cur_sequence = sequence_; |
| 765 | // Requeue waiters onto mutex. The waiter holds the contender count on the mutex high ensuring |
| 766 | // mutex unlocks will awaken the requeued waiter thread. |
| 767 | done = futex(&sequence_, FUTEX_CMP_REQUEUE, 0, |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 768 | reinterpret_cast<const timespec*>(std::numeric_limits<int32_t>::max()), |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 769 | &guard_.state_, cur_sequence) != -1; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 770 | if (!done) { |
| 771 | if (errno != EAGAIN) { |
| 772 | PLOG(FATAL) << "futex cmp requeue failed for " << name_; |
| 773 | } |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 774 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 775 | } while (!done); |
| 776 | } |
| 777 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 778 | CHECK_MUTEX_CALL(pthread_cond_broadcast, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 779 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 780 | } |
| 781 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 782 | void ConditionVariable::Signal(Thread* self) { |
| 783 | DCHECK(self == NULL || self == Thread::Current()); |
| 784 | guard_.AssertExclusiveHeld(self); |
| 785 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 786 | if (num_waiters_ > 0) { |
| 787 | android_atomic_inc(&sequence_); // Indicate a signal occurred. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 788 | // Futex wake 1 waiter who will then come and in contend on mutex. It'd be nice to requeue them |
| 789 | // to avoid this, however, requeueing can only move all waiters. |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 790 | int num_woken = futex(&sequence_, FUTEX_WAKE, 1, NULL, NULL, 0); |
| 791 | // 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] | 792 | CHECK((num_woken == 0) || (num_woken == 1)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 793 | } |
| 794 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 795 | CHECK_MUTEX_CALL(pthread_cond_signal, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 796 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 797 | } |
| 798 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 799 | void ConditionVariable::Wait(Thread* self) { |
| 800 | DCHECK(self == NULL || self == Thread::Current()); |
| 801 | guard_.AssertExclusiveHeld(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 802 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 803 | #if ART_USE_FUTEXES |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 804 | num_waiters_++; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 805 | // Ensure the Mutex is contended so that requeued threads are awoken. |
| 806 | android_atomic_inc(&guard_.num_contenders_); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 807 | guard_.recursion_count_ = 1; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 808 | int32_t cur_sequence = sequence_; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 809 | guard_.ExclusiveUnlock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 810 | if (futex(&sequence_, FUTEX_WAIT, cur_sequence, NULL, NULL, 0) != 0) { |
| 811 | // Futex failed, check it is an expected error. |
| 812 | // EAGAIN == EWOULDBLK, so we let the caller try again. |
| 813 | // EINTR implies a signal was sent to this thread. |
| 814 | if ((errno != EINTR) && (errno != EAGAIN)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 815 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 816 | } |
| 817 | } |
| 818 | guard_.ExclusiveLock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 819 | CHECK_GE(num_waiters_, 0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 820 | num_waiters_--; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 821 | // We awoke and so no longer require awakes from the guard_'s unlock. |
| 822 | CHECK_GE(guard_.num_contenders_, 0); |
| 823 | android_atomic_dec(&guard_.num_contenders_); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 824 | #else |
| 825 | guard_.recursion_count_ = 0; |
| 826 | CHECK_MUTEX_CALL(pthread_cond_wait, (&cond_, &guard_.mutex_)); |
| 827 | #endif |
| 828 | guard_.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 829 | } |
| 830 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 831 | void ConditionVariable::TimedWait(Thread* self, int64_t ms, int32_t ns) { |
| 832 | DCHECK(self == NULL || self == Thread::Current()); |
| 833 | guard_.AssertExclusiveHeld(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 834 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 835 | #if ART_USE_FUTEXES |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 836 | timespec rel_ts; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 837 | InitTimeSpec(false, CLOCK_REALTIME, ms, ns, &rel_ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 838 | num_waiters_++; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 839 | // Ensure the Mutex is contended so that requeued threads are awoken. |
| 840 | android_atomic_inc(&guard_.num_contenders_); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 841 | guard_.recursion_count_ = 1; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 842 | int32_t cur_sequence = sequence_; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 843 | guard_.ExclusiveUnlock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 844 | if (futex(&sequence_, FUTEX_WAIT, cur_sequence, &rel_ts, NULL, 0) != 0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 845 | if (errno == ETIMEDOUT) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 846 | // Timed out we're done. |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 847 | } else if ((errno == EINTR) || (errno == EAGAIN)) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 848 | // A signal or ConditionVariable::Signal/Broadcast has come in. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 849 | } else { |
| 850 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 851 | } |
| 852 | } |
| 853 | guard_.ExclusiveLock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 854 | CHECK_GE(num_waiters_, 0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 855 | num_waiters_--; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 856 | // We awoke and so no longer require awakes from the guard_'s unlock. |
| 857 | CHECK_GE(guard_.num_contenders_, 0); |
| 858 | android_atomic_dec(&guard_.num_contenders_); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 859 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 860 | #ifdef HAVE_TIMEDWAIT_MONOTONIC |
| 861 | #define TIMEDWAIT pthread_cond_timedwait_monotonic |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 862 | int clock = CLOCK_MONOTONIC; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 863 | #else |
| 864 | #define TIMEDWAIT pthread_cond_timedwait |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 865 | int clock = CLOCK_REALTIME; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 866 | #endif |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 867 | guard_.recursion_count_ = 0; |
| 868 | timespec ts; |
Brian Carlstrom | bcc2926 | 2012-11-02 11:36:03 -0700 | [diff] [blame] | 869 | InitTimeSpec(true, clock, ms, ns, &ts); |
| 870 | int rc = TEMP_FAILURE_RETRY(TIMEDWAIT(&cond_, &guard_.mutex_, &ts)); |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 871 | if (rc != 0 && rc != ETIMEDOUT) { |
| 872 | errno = rc; |
| 873 | PLOG(FATAL) << "TimedWait failed for " << name_; |
| 874 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 875 | #endif |
| 876 | guard_.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 877 | } |
| 878 | |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 879 | } // namespace art |