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" |
Ian Rogers | 693ff61 | 2013-02-01 10:56:12 -0800 | [diff] [blame] | 24 | #include "mutex-inl.h" |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 25 | #include "runtime.h" |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 26 | #include "scoped_thread_state_change.h" |
Ian Rogers | 04d7aa9 | 2013-03-16 14:29:17 -0700 | [diff] [blame] | 27 | #include "thread-inl.h" |
Elliott Hughes | ffb465f | 2012-03-01 18:46:05 -0800 | [diff] [blame] | 28 | #include "utils.h" |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 29 | |
| 30 | namespace art { |
| 31 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 32 | #if ART_USE_FUTEXES |
| 33 | static bool ComputeRelativeTimeSpec(timespec* result_ts, const timespec& lhs, const timespec& rhs) { |
Brian Carlstrom | fb6996f | 2013-07-18 18:21:14 -0700 | [diff] [blame] | 34 | const int32_t one_sec = 1000 * 1000 * 1000; // one second in nanoseconds. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 35 | result_ts->tv_sec = lhs.tv_sec - rhs.tv_sec; |
| 36 | result_ts->tv_nsec = lhs.tv_nsec - rhs.tv_nsec; |
| 37 | if (result_ts->tv_nsec < 0) { |
| 38 | result_ts->tv_sec--; |
| 39 | result_ts->tv_nsec += one_sec; |
| 40 | } else if (result_ts->tv_nsec > one_sec) { |
| 41 | result_ts->tv_sec++; |
| 42 | result_ts->tv_nsec -= one_sec; |
| 43 | } |
| 44 | return result_ts->tv_sec < 0; |
| 45 | } |
| 46 | #endif |
| 47 | |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 48 | struct AllMutexData { |
| 49 | // A guard for all_mutexes_ that's not a mutex (Mutexes must CAS to acquire and busy wait). |
| 50 | AtomicInteger all_mutexes_guard; |
| 51 | // All created mutexes guarded by all_mutexes_guard_. |
| 52 | std::set<BaseMutex*>* all_mutexes; |
| 53 | AllMutexData() : all_mutexes(NULL) {} |
| 54 | }; |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 55 | static struct AllMutexData gAllMutexData[kAllMutexDataSize]; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 56 | |
| 57 | class ScopedAllMutexesLock { |
| 58 | public: |
Brian Carlstrom | 93ba893 | 2013-07-17 21:31:49 -0700 | [diff] [blame] | 59 | explicit ScopedAllMutexesLock(const BaseMutex* mutex) : mutex_(mutex) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 60 | while (!gAllMutexData->all_mutexes_guard.CompareAndSwap(0, reinterpret_cast<int32_t>(mutex))) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 61 | NanoSleep(100); |
| 62 | } |
| 63 | } |
| 64 | ~ScopedAllMutexesLock() { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 65 | while (!gAllMutexData->all_mutexes_guard.CompareAndSwap(reinterpret_cast<int32_t>(mutex_), 0)) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 66 | NanoSleep(100); |
| 67 | } |
| 68 | } |
| 69 | private: |
| 70 | const BaseMutex* const mutex_; |
| 71 | }; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 72 | |
| 73 | BaseMutex::BaseMutex(const char* name, LockLevel level) : level_(level), name_(name) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 74 | if (kLogLockContentions) { |
| 75 | ScopedAllMutexesLock mu(this); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 76 | std::set<BaseMutex*>** all_mutexes_ptr = &gAllMutexData->all_mutexes; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 77 | if (*all_mutexes_ptr == NULL) { |
| 78 | // We leak the global set of all mutexes to avoid ordering issues in global variable |
| 79 | // construction/destruction. |
| 80 | *all_mutexes_ptr = new std::set<BaseMutex*>(); |
| 81 | } |
| 82 | (*all_mutexes_ptr)->insert(this); |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 83 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | BaseMutex::~BaseMutex() { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 87 | if (kLogLockContentions) { |
| 88 | ScopedAllMutexesLock mu(this); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 89 | gAllMutexData->all_mutexes->erase(this); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 90 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | void BaseMutex::DumpAll(std::ostream& os) { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 94 | if (kLogLockContentions) { |
| 95 | os << "Mutex logging:\n"; |
| 96 | ScopedAllMutexesLock mu(reinterpret_cast<const BaseMutex*>(-1)); |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 97 | std::set<BaseMutex*>* all_mutexes = gAllMutexData->all_mutexes; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 98 | if (all_mutexes == NULL) { |
| 99 | // No mutexes have been created yet during at startup. |
| 100 | return; |
| 101 | } |
| 102 | typedef std::set<BaseMutex*>::const_iterator It; |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 103 | os << "(Contended)\n"; |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 104 | for (It it = all_mutexes->begin(); it != all_mutexes->end(); ++it) { |
| 105 | BaseMutex* mutex = *it; |
| 106 | if (mutex->HasEverContended()) { |
| 107 | mutex->Dump(os); |
| 108 | os << "\n"; |
| 109 | } |
| 110 | } |
| 111 | os << "(Never contented)\n"; |
| 112 | for (It it = all_mutexes->begin(); it != all_mutexes->end(); ++it) { |
| 113 | BaseMutex* mutex = *it; |
| 114 | if (!mutex->HasEverContended()) { |
| 115 | mutex->Dump(os); |
| 116 | os << "\n"; |
| 117 | } |
| 118 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 119 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 120 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 121 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 122 | void BaseMutex::CheckSafeToWait(Thread* self) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 123 | if (self == NULL) { |
| 124 | CheckUnattachedThread(level_); |
| 125 | return; |
| 126 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 127 | if (kDebugLocking) { |
Ian Rogers | d9c4fc9 | 2013-10-01 19:45:43 -0700 | [diff] [blame] | 128 | CHECK(self->GetHeldMutex(level_) == this || level_ == kMonitorLock) |
| 129 | << "Waiting on unacquired mutex: " << name_; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 130 | bool bad_mutexes_held = false; |
Elliott Hughes | 0f82716 | 2013-02-26 12:12:58 -0800 | [diff] [blame] | 131 | for (int i = kLockLevelCount - 1; i >= 0; --i) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 132 | if (i != level_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 133 | BaseMutex* held_mutex = self->GetHeldMutex(static_cast<LockLevel>(i)); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 134 | if (held_mutex != NULL) { |
Elliott Hughes | 0f82716 | 2013-02-26 12:12:58 -0800 | [diff] [blame] | 135 | LOG(ERROR) << "Holding \"" << held_mutex->name_ << "\" " |
| 136 | << "(level " << LockLevel(i) << ") while performing wait on " |
| 137 | << "\"" << name_ << "\" (level " << level_ << ")"; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 138 | bad_mutexes_held = true; |
| 139 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 140 | } |
| 141 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 142 | CHECK(!bad_mutexes_held); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 143 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 144 | } |
| 145 | |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 146 | inline void BaseMutex::ContentionLogData::AddToWaitTime(uint64_t value) { |
| 147 | if (kLogLockContentions) { |
| 148 | // Atomically add value to wait_time. |
| 149 | uint64_t new_val, old_val; |
| 150 | volatile int64_t* addr = reinterpret_cast<volatile int64_t*>(&wait_time); |
| 151 | volatile const int64_t* caddr = const_cast<volatile const int64_t*>(addr); |
| 152 | do { |
| 153 | old_val = static_cast<uint64_t>(QuasiAtomic::Read64(caddr)); |
| 154 | new_val = old_val + value; |
| 155 | } while (!QuasiAtomic::Cas64(static_cast<int64_t>(old_val), static_cast<int64_t>(new_val), addr)); |
| 156 | } |
| 157 | } |
| 158 | |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 159 | void BaseMutex::RecordContention(uint64_t blocked_tid, |
| 160 | uint64_t owner_tid, |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 161 | uint64_t nano_time_blocked) { |
| 162 | if (kLogLockContentions) { |
| 163 | ContentionLogData* data = contetion_log_data_; |
| 164 | ++(data->contention_count); |
| 165 | data->AddToWaitTime(nano_time_blocked); |
| 166 | ContentionLogEntry* log = data->contention_log; |
| 167 | // This code is intentionally racy as it is only used for diagnostics. |
| 168 | uint32_t slot = data->cur_content_log_entry; |
| 169 | if (log[slot].blocked_tid == blocked_tid && |
| 170 | log[slot].owner_tid == blocked_tid) { |
| 171 | ++log[slot].count; |
| 172 | } else { |
| 173 | uint32_t new_slot; |
| 174 | do { |
| 175 | slot = data->cur_content_log_entry; |
| 176 | new_slot = (slot + 1) % kContentionLogSize; |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 177 | } while (!data->cur_content_log_entry.CompareAndSwap(slot, new_slot)); |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 178 | log[new_slot].blocked_tid = blocked_tid; |
| 179 | log[new_slot].owner_tid = owner_tid; |
| 180 | log[new_slot].count = 1; |
| 181 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 182 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 183 | } |
| 184 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 185 | void BaseMutex::DumpContention(std::ostream& os) const { |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 186 | if (kLogLockContentions) { |
| 187 | const ContentionLogData* data = contetion_log_data_; |
| 188 | const ContentionLogEntry* log = data->contention_log; |
| 189 | uint64_t wait_time = data->wait_time; |
| 190 | uint32_t contention_count = data->contention_count; |
| 191 | if (contention_count == 0) { |
| 192 | os << "never contended"; |
| 193 | } else { |
| 194 | os << "contended " << contention_count |
| 195 | << " times, average wait of contender " << PrettyDuration(wait_time / contention_count); |
| 196 | SafeMap<uint64_t, size_t> most_common_blocker; |
| 197 | SafeMap<uint64_t, size_t> most_common_blocked; |
| 198 | typedef SafeMap<uint64_t, size_t>::const_iterator It; |
| 199 | for (size_t i = 0; i < kContentionLogSize; ++i) { |
| 200 | uint64_t blocked_tid = log[i].blocked_tid; |
| 201 | uint64_t owner_tid = log[i].owner_tid; |
| 202 | uint32_t count = log[i].count; |
| 203 | if (count > 0) { |
| 204 | It it = most_common_blocked.find(blocked_tid); |
| 205 | if (it != most_common_blocked.end()) { |
| 206 | most_common_blocked.Overwrite(blocked_tid, it->second + count); |
| 207 | } else { |
| 208 | most_common_blocked.Put(blocked_tid, count); |
| 209 | } |
| 210 | it = most_common_blocker.find(owner_tid); |
| 211 | if (it != most_common_blocker.end()) { |
| 212 | most_common_blocker.Overwrite(owner_tid, it->second + count); |
| 213 | } else { |
| 214 | most_common_blocker.Put(owner_tid, count); |
| 215 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 216 | } |
| 217 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 218 | uint64_t max_tid = 0; |
| 219 | size_t max_tid_count = 0; |
| 220 | for (It it = most_common_blocked.begin(); it != most_common_blocked.end(); ++it) { |
| 221 | if (it->second > max_tid_count) { |
| 222 | max_tid = it->first; |
| 223 | max_tid_count = it->second; |
| 224 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 225 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 226 | if (max_tid != 0) { |
| 227 | os << " sample shows most blocked tid=" << max_tid; |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 228 | } |
Hiroshi Yamauchi | 1afde13 | 2013-08-06 17:09:30 -0700 | [diff] [blame] | 229 | max_tid = 0; |
| 230 | max_tid_count = 0; |
| 231 | for (It it = most_common_blocker.begin(); it != most_common_blocker.end(); ++it) { |
| 232 | if (it->second > max_tid_count) { |
| 233 | max_tid = it->first; |
| 234 | max_tid_count = it->second; |
| 235 | } |
| 236 | } |
| 237 | if (max_tid != 0) { |
| 238 | os << " sample shows tid=" << max_tid << " owning during this time"; |
| 239 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 240 | } |
| 241 | } |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 245 | Mutex::Mutex(const char* name, LockLevel level, bool recursive) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 246 | : BaseMutex(name, level), recursive_(recursive), recursion_count_(0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 247 | #if ART_USE_FUTEXES |
| 248 | state_ = 0; |
| 249 | exclusive_owner_ = 0; |
| 250 | num_contenders_ = 0; |
| 251 | #elif defined(__BIONIC__) || defined(__APPLE__) |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 252 | // Use recursive mutexes for bionic and Apple otherwise the |
| 253 | // non-recursive mutexes don't have TIDs to check lock ownership of. |
Elliott Hughes | bbd9d83 | 2011-11-07 14:40:00 -0800 | [diff] [blame] | 254 | pthread_mutexattr_t attributes; |
| 255 | CHECK_MUTEX_CALL(pthread_mutexattr_init, (&attributes)); |
| 256 | CHECK_MUTEX_CALL(pthread_mutexattr_settype, (&attributes, PTHREAD_MUTEX_RECURSIVE)); |
| 257 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, &attributes)); |
| 258 | CHECK_MUTEX_CALL(pthread_mutexattr_destroy, (&attributes)); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 259 | #else |
| 260 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, NULL)); |
| 261 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 262 | } |
| 263 | |
| 264 | Mutex::~Mutex() { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 265 | #if ART_USE_FUTEXES |
| 266 | if (state_ != 0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 267 | Runtime* runtime = Runtime::Current(); |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 268 | bool shutting_down = runtime == nullptr || runtime->IsShuttingDown(Thread::Current()); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 269 | LOG(shutting_down ? WARNING : FATAL) << "destroying mutex with owner: " << exclusive_owner_; |
| 270 | } else { |
| 271 | CHECK_EQ(exclusive_owner_, 0U) << "unexpectedly found an owner on unlocked mutex " << name_; |
| 272 | CHECK_EQ(num_contenders_, 0) << "unexpectedly found a contender on mutex " << name_; |
| 273 | } |
| 274 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 275 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 276 | // may still be using locks. |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 277 | int rc = pthread_mutex_destroy(&mutex_); |
| 278 | if (rc != 0) { |
| 279 | errno = rc; |
Elliott Hughes | b3bd5f0 | 2012-03-08 21:05:27 -0800 | [diff] [blame] | 280 | // 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] | 281 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 282 | Runtime* runtime = Runtime::Current(); |
Mathieu Chartier | 34e8293 | 2013-11-12 18:22:47 -0800 | [diff] [blame] | 283 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDownLocked(); |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 284 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_mutex_destroy failed for " << name_; |
| 285 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 286 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 287 | } |
| 288 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 289 | void Mutex::ExclusiveLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 290 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 291 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 292 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 293 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 294 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 295 | #if ART_USE_FUTEXES |
| 296 | bool done = false; |
| 297 | do { |
| 298 | int32_t cur_state = state_; |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 299 | if (LIKELY(cur_state == 0)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 300 | // Change state from 0 to 1. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 301 | done = __sync_bool_compare_and_swap(&state_, 0 /* cur_state */, 1 /* new state */); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 302 | } else { |
| 303 | // Failed to acquire, hang up. |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 304 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 305 | num_contenders_++; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 306 | if (futex(&state_, FUTEX_WAIT, 1, NULL, NULL, 0) != 0) { |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 307 | // EAGAIN and EINTR both indicate a spurious failure, try again from the beginning. |
| 308 | // We don't use TEMP_FAILURE_RETRY so we can intentionally retry to acquire the lock. |
| 309 | if ((errno != EAGAIN) && (errno != EINTR)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 310 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 311 | } |
| 312 | } |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 313 | num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 314 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 315 | } while (!done); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 316 | QuasiAtomic::MembarStoreLoad(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 317 | DCHECK_EQ(state_, 1); |
| 318 | exclusive_owner_ = SafeGetTid(self); |
| 319 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 320 | CHECK_MUTEX_CALL(pthread_mutex_lock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 321 | #endif |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 322 | RegisterAsLocked(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 323 | } |
| 324 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 325 | if (kDebugLocking) { |
| 326 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 327 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 328 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 329 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 330 | } |
| 331 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 332 | bool Mutex::ExclusiveTryLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 333 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 334 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 335 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 336 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 337 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 338 | #if ART_USE_FUTEXES |
| 339 | bool done = false; |
| 340 | do { |
| 341 | int32_t cur_state = state_; |
| 342 | if (cur_state == 0) { |
| 343 | // Change state from 0 to 1. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 344 | done = __sync_bool_compare_and_swap(&state_, 0 /* cur_state */, 1 /* new state */); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 345 | } else { |
| 346 | return false; |
| 347 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 348 | } while (!done); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 349 | QuasiAtomic::MembarStoreLoad(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 350 | DCHECK_EQ(state_, 1); |
| 351 | exclusive_owner_ = SafeGetTid(self); |
| 352 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 353 | int result = pthread_mutex_trylock(&mutex_); |
| 354 | if (result == EBUSY) { |
| 355 | return false; |
| 356 | } |
| 357 | if (result != 0) { |
| 358 | errno = result; |
| 359 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 360 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 361 | #endif |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 362 | RegisterAsLocked(self); |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 363 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 364 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 365 | if (kDebugLocking) { |
| 366 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 367 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 368 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 369 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 370 | return true; |
| 371 | } |
| 372 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 373 | void Mutex::ExclusiveUnlock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 374 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 375 | AssertHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 376 | recursion_count_--; |
| 377 | if (!recursive_ || recursion_count_ == 0) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 378 | if (kDebugLocking) { |
| 379 | CHECK(recursion_count_ == 0 || recursive_) << "Unexpected recursion count on mutex: " |
| 380 | << name_ << " " << recursion_count_; |
| 381 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 382 | RegisterAsUnlocked(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 383 | #if ART_USE_FUTEXES |
| 384 | bool done = false; |
| 385 | do { |
| 386 | int32_t cur_state = state_; |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 387 | if (LIKELY(cur_state == 1)) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 388 | QuasiAtomic::MembarStoreStore(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 389 | // We're no longer the owner. |
| 390 | exclusive_owner_ = 0; |
| 391 | // Change state to 0. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 392 | done = __sync_bool_compare_and_swap(&state_, cur_state, 0 /* new state */); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 393 | if (LIKELY(done)) { // Spurious fail? |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 394 | // Wake a contender |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 395 | if (UNLIKELY(num_contenders_ > 0)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 396 | futex(&state_, FUTEX_WAKE, 1, NULL, NULL, 0); |
| 397 | } |
| 398 | } |
| 399 | } else { |
Ian Rogers | c4ee12e | 2013-05-16 11:19:53 -0700 | [diff] [blame] | 400 | // Logging acquires the logging lock, avoid infinite recursion in that case. |
| 401 | if (this != Locks::logging_lock_) { |
| 402 | LOG(FATAL) << "Unexpected state_ in unlock " << cur_state << " for " << name_; |
| 403 | } else { |
| 404 | LogMessageData data(__FILE__, __LINE__, INTERNAL_FATAL, -1); |
| 405 | LogMessage::LogLine(data, StringPrintf("Unexpected state_ %d in unlock for %s", |
| 406 | cur_state, name_).c_str()); |
| 407 | _exit(1); |
| 408 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 409 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 410 | } while (!done); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 411 | QuasiAtomic::MembarStoreLoad(); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 412 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 413 | CHECK_MUTEX_CALL(pthread_mutex_unlock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 414 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 415 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 416 | } |
| 417 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 418 | void Mutex::Dump(std::ostream& os) const { |
| 419 | os << (recursive_ ? "recursive " : "non-recursive ") |
| 420 | << name_ |
| 421 | << " level=" << static_cast<int>(level_) |
| 422 | << " rec=" << recursion_count_ |
| 423 | << " owner=" << GetExclusiveOwnerTid() << " "; |
| 424 | DumpContention(os); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | std::ostream& operator<<(std::ostream& os, const Mutex& mu) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 428 | mu.Dump(os); |
| 429 | return os; |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 430 | } |
| 431 | |
Brian Carlstrom | 02c8cc6 | 2013-07-18 15:54:44 -0700 | [diff] [blame] | 432 | ReaderWriterMutex::ReaderWriterMutex(const char* name, LockLevel level) |
| 433 | : BaseMutex(name, level) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 434 | #if ART_USE_FUTEXES |
| 435 | , state_(0), exclusive_owner_(0), num_pending_readers_(0), num_pending_writers_(0) |
| 436 | #endif |
Brian Carlstrom | 7934ac2 | 2013-07-26 10:54:15 -0700 | [diff] [blame] | 437 | { // NOLINT(whitespace/braces) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 438 | #if !ART_USE_FUTEXES |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 439 | CHECK_MUTEX_CALL(pthread_rwlock_init, (&rwlock_, NULL)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 440 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 441 | } |
| 442 | |
| 443 | ReaderWriterMutex::~ReaderWriterMutex() { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 444 | #if ART_USE_FUTEXES |
| 445 | CHECK_EQ(state_, 0); |
| 446 | CHECK_EQ(exclusive_owner_, 0U); |
| 447 | CHECK_EQ(num_pending_readers_, 0); |
| 448 | CHECK_EQ(num_pending_writers_, 0); |
| 449 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 450 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 451 | // may still be using locks. |
| 452 | int rc = pthread_rwlock_destroy(&rwlock_); |
| 453 | if (rc != 0) { |
| 454 | errno = rc; |
| 455 | // 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] | 456 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 457 | Runtime* runtime = Runtime::Current(); |
Mathieu Chartier | 34e8293 | 2013-11-12 18:22:47 -0800 | [diff] [blame] | 458 | bool shutting_down = runtime == NULL || runtime->IsShuttingDownLocked(); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 459 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_rwlock_destroy failed for " << name_; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 460 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 461 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 462 | } |
| 463 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 464 | void ReaderWriterMutex::ExclusiveLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 465 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 466 | AssertNotExclusiveHeld(self); |
| 467 | #if ART_USE_FUTEXES |
| 468 | bool done = false; |
| 469 | do { |
| 470 | int32_t cur_state = state_; |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 471 | if (LIKELY(cur_state == 0)) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 472 | // Change state from 0 to -1. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 473 | done = __sync_bool_compare_and_swap(&state_, 0 /* cur_state*/, -1 /* new state */); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 474 | } else { |
| 475 | // Failed to acquire, hang up. |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 476 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 477 | num_pending_writers_++; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 478 | if (futex(&state_, FUTEX_WAIT, cur_state, NULL, NULL, 0) != 0) { |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 479 | // EAGAIN and EINTR both indicate a spurious failure, try again from the beginning. |
| 480 | // We don't use TEMP_FAILURE_RETRY so we can intentionally retry to acquire the lock. |
| 481 | if ((errno != EAGAIN) && (errno != EINTR)) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 482 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 483 | } |
| 484 | } |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 485 | num_pending_writers_--; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 486 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 487 | } while (!done); |
Ian Rogers | ab47016 | 2012-09-29 23:06:53 -0700 | [diff] [blame] | 488 | DCHECK_EQ(state_, -1); |
| 489 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 490 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 491 | CHECK_MUTEX_CALL(pthread_rwlock_wrlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 492 | #endif |
| 493 | RegisterAsLocked(self); |
| 494 | AssertExclusiveHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 495 | } |
| 496 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 497 | void ReaderWriterMutex::ExclusiveUnlock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 498 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 499 | AssertExclusiveHeld(self); |
| 500 | RegisterAsUnlocked(self); |
| 501 | #if ART_USE_FUTEXES |
| 502 | bool done = false; |
| 503 | do { |
| 504 | int32_t cur_state = state_; |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 505 | if (LIKELY(cur_state == -1)) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 506 | // We're no longer the owner. |
| 507 | exclusive_owner_ = 0; |
| 508 | // Change state from -1 to 0. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 509 | done = __sync_bool_compare_and_swap(&state_, -1 /* cur_state*/, 0 /* new state */); |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 510 | if (LIKELY(done)) { // cmpxchg may fail due to noise? |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 511 | // Wake any waiters. |
Hiroshi Yamauchi | 967a0ad | 2013-09-10 16:24:21 -0700 | [diff] [blame] | 512 | if (UNLIKELY(num_pending_readers_ > 0 || num_pending_writers_ > 0)) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 513 | futex(&state_, FUTEX_WAKE, -1, NULL, NULL, 0); |
| 514 | } |
| 515 | } |
| 516 | } else { |
| 517 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 518 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 519 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 520 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 521 | CHECK_MUTEX_CALL(pthread_rwlock_unlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 522 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 523 | } |
| 524 | |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 525 | #if HAVE_TIMED_RWLOCK |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 526 | bool ReaderWriterMutex::ExclusiveLockWithTimeout(Thread* self, int64_t ms, int32_t ns) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 527 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 528 | #if ART_USE_FUTEXES |
| 529 | bool done = false; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 530 | timespec end_abs_ts; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 531 | InitTimeSpec(true, CLOCK_REALTIME, ms, ns, &end_abs_ts); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 532 | do { |
| 533 | int32_t cur_state = state_; |
| 534 | if (cur_state == 0) { |
| 535 | // Change state from 0 to -1. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 536 | done = __sync_bool_compare_and_swap(&state_, 0 /* cur_state */, -1 /* new state */); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 537 | } else { |
| 538 | // Failed to acquire, hang up. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 539 | timespec now_abs_ts; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 540 | InitTimeSpec(true, CLOCK_REALTIME, 0, 0, &now_abs_ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 541 | timespec rel_ts; |
| 542 | if (ComputeRelativeTimeSpec(&rel_ts, end_abs_ts, now_abs_ts)) { |
| 543 | return false; // Timed out. |
| 544 | } |
Hiroshi Yamauchi | b373308 | 2013-08-12 17:28:49 -0700 | [diff] [blame] | 545 | ScopedContentionRecorder scr(this, SafeGetTid(self), GetExclusiveOwnerTid()); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 546 | num_pending_writers_++; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 547 | if (futex(&state_, FUTEX_WAIT, cur_state, &rel_ts, NULL, 0) != 0) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 548 | if (errno == ETIMEDOUT) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 549 | num_pending_writers_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 550 | return false; // Timed out. |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 551 | } else if ((errno != EAGAIN) && (errno != EINTR)) { |
| 552 | // EAGAIN and EINTR both indicate a spurious failure, |
| 553 | // recompute the relative time out from now and try again. |
| 554 | // 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] | 555 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 556 | } |
| 557 | } |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 558 | num_pending_writers_--; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 559 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 560 | } while (!done); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 561 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 562 | #else |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 563 | timespec ts; |
Brian Carlstrom | bcc2926 | 2012-11-02 11:36:03 -0700 | [diff] [blame] | 564 | InitTimeSpec(true, CLOCK_REALTIME, ms, ns, &ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 565 | int result = pthread_rwlock_timedwrlock(&rwlock_, &ts); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 566 | if (result == ETIMEDOUT) { |
| 567 | return false; |
| 568 | } |
| 569 | if (result != 0) { |
| 570 | errno = result; |
Ian Rogers | a5acfd3 | 2012-08-15 11:50:10 -0700 | [diff] [blame] | 571 | PLOG(FATAL) << "pthread_rwlock_timedwrlock failed for " << name_; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 572 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 573 | #endif |
| 574 | RegisterAsLocked(self); |
| 575 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 576 | return true; |
| 577 | } |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 578 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 579 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 580 | bool ReaderWriterMutex::SharedTryLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 581 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 582 | #if ART_USE_FUTEXES |
| 583 | bool done = false; |
| 584 | do { |
| 585 | int32_t cur_state = state_; |
| 586 | if (cur_state >= 0) { |
| 587 | // Add as an extra reader. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 588 | done = __sync_bool_compare_and_swap(&state_, cur_state, cur_state + 1); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 589 | } else { |
| 590 | // Owner holds it exclusively. |
| 591 | return false; |
| 592 | } |
Brian Carlstrom | df62950 | 2013-07-17 22:39:56 -0700 | [diff] [blame] | 593 | } while (!done); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 594 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 595 | int result = pthread_rwlock_tryrdlock(&rwlock_); |
| 596 | if (result == EBUSY) { |
| 597 | return false; |
| 598 | } |
| 599 | if (result != 0) { |
| 600 | errno = result; |
| 601 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 602 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 603 | #endif |
| 604 | RegisterAsLocked(self); |
| 605 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 606 | return true; |
| 607 | } |
| 608 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 609 | bool ReaderWriterMutex::IsSharedHeld(const Thread* self) const { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 610 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 611 | bool result; |
| 612 | if (UNLIKELY(self == NULL)) { // Handle unattached threads. |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 613 | result = IsExclusiveHeld(self); // TODO: a better best effort here. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 614 | } else { |
| 615 | result = (self->GetHeldMutex(level_) == this); |
| 616 | } |
| 617 | return result; |
| 618 | } |
| 619 | |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 620 | void ReaderWriterMutex::Dump(std::ostream& os) const { |
| 621 | os << name_ |
| 622 | << " level=" << static_cast<int>(level_) |
| 623 | << " owner=" << GetExclusiveOwnerTid() << " "; |
| 624 | DumpContention(os); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | std::ostream& operator<<(std::ostream& os, const ReaderWriterMutex& mu) { |
Ian Rogers | 56edc43 | 2013-01-18 16:51:51 -0800 | [diff] [blame] | 628 | mu.Dump(os); |
| 629 | return os; |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 630 | } |
| 631 | |
Ian Rogers | 23055dc | 2013-04-18 16:29:16 -0700 | [diff] [blame] | 632 | ConditionVariable::ConditionVariable(const char* name, Mutex& guard) |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 633 | : name_(name), guard_(guard) { |
| 634 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 635 | sequence_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 636 | num_waiters_ = 0; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 637 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 638 | CHECK_MUTEX_CALL(pthread_cond_init, (&cond_, NULL)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 639 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | ConditionVariable::~ConditionVariable() { |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 643 | #if ART_USE_FUTEXES |
| 644 | if (num_waiters_!= 0) { |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 645 | Runtime* runtime = Runtime::Current(); |
Mathieu Chartier | 590fee9 | 2013-09-13 13:46:47 -0700 | [diff] [blame] | 646 | bool shutting_down = runtime == nullptr || runtime->IsShuttingDown(Thread::Current()); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 647 | LOG(shutting_down ? WARNING : FATAL) << "ConditionVariable::~ConditionVariable for " << name_ |
| 648 | << " called with " << num_waiters_ << " waiters."; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 649 | } |
| 650 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 651 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 652 | // may still be using condition variables. |
| 653 | int rc = pthread_cond_destroy(&cond_); |
| 654 | if (rc != 0) { |
| 655 | errno = rc; |
Ian Rogers | 50b35e2 | 2012-10-04 10:09:15 -0700 | [diff] [blame] | 656 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 657 | Runtime* runtime = Runtime::Current(); |
Mathieu Chartier | 34e8293 | 2013-11-12 18:22:47 -0800 | [diff] [blame] | 658 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDownLocked(); |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 659 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_cond_destroy failed for " << name_; |
| 660 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 661 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 662 | } |
| 663 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 664 | void ConditionVariable::Broadcast(Thread* self) { |
| 665 | DCHECK(self == NULL || self == Thread::Current()); |
| 666 | // TODO: enable below, there's a race in thread creation that causes false failures currently. |
| 667 | // guard_.AssertExclusiveHeld(self); |
Mathieu Chartier | e46cd75 | 2012-10-31 16:56:18 -0700 | [diff] [blame] | 668 | DCHECK_EQ(guard_.GetExclusiveOwnerTid(), SafeGetTid(self)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 669 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 670 | if (num_waiters_ > 0) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 671 | sequence_++; // Indicate the broadcast occurred. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 672 | bool done = false; |
| 673 | do { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 674 | int32_t cur_sequence = sequence_; |
| 675 | // Requeue waiters onto mutex. The waiter holds the contender count on the mutex high ensuring |
| 676 | // mutex unlocks will awaken the requeued waiter thread. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 677 | done = futex(sequence_.Address(), FUTEX_CMP_REQUEUE, 0, |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 678 | reinterpret_cast<const timespec*>(std::numeric_limits<int32_t>::max()), |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 679 | &guard_.state_, cur_sequence) != -1; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 680 | if (!done) { |
| 681 | if (errno != EAGAIN) { |
| 682 | PLOG(FATAL) << "futex cmp requeue failed for " << name_; |
| 683 | } |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 684 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 685 | } while (!done); |
| 686 | } |
| 687 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 688 | CHECK_MUTEX_CALL(pthread_cond_broadcast, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 689 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 690 | } |
| 691 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 692 | void ConditionVariable::Signal(Thread* self) { |
| 693 | DCHECK(self == NULL || self == Thread::Current()); |
| 694 | guard_.AssertExclusiveHeld(self); |
| 695 | #if ART_USE_FUTEXES |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 696 | if (num_waiters_ > 0) { |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 697 | sequence_++; // Indicate a signal occurred. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 698 | // Futex wake 1 waiter who will then come and in contend on mutex. It'd be nice to requeue them |
| 699 | // to avoid this, however, requeueing can only move all waiters. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 700 | int num_woken = futex(sequence_.Address(), FUTEX_WAKE, 1, NULL, NULL, 0); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 701 | // 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] | 702 | CHECK((num_woken == 0) || (num_woken == 1)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 703 | } |
| 704 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 705 | CHECK_MUTEX_CALL(pthread_cond_signal, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 706 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 707 | } |
| 708 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 709 | void ConditionVariable::Wait(Thread* self) { |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 710 | guard_.CheckSafeToWait(self); |
| 711 | WaitHoldingLocks(self); |
| 712 | } |
| 713 | |
| 714 | void ConditionVariable::WaitHoldingLocks(Thread* self) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 715 | DCHECK(self == NULL || self == Thread::Current()); |
| 716 | guard_.AssertExclusiveHeld(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 717 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 718 | #if ART_USE_FUTEXES |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 719 | num_waiters_++; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 720 | // Ensure the Mutex is contended so that requeued threads are awoken. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 721 | guard_.num_contenders_++; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 722 | guard_.recursion_count_ = 1; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 723 | int32_t cur_sequence = sequence_; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 724 | guard_.ExclusiveUnlock(self); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 725 | if (futex(sequence_.Address(), FUTEX_WAIT, cur_sequence, NULL, NULL, 0) != 0) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 726 | // Futex failed, check it is an expected error. |
| 727 | // EAGAIN == EWOULDBLK, so we let the caller try again. |
| 728 | // EINTR implies a signal was sent to this thread. |
| 729 | if ((errno != EINTR) && (errno != EAGAIN)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 730 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 731 | } |
| 732 | } |
| 733 | guard_.ExclusiveLock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 734 | CHECK_GE(num_waiters_, 0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 735 | num_waiters_--; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 736 | // We awoke and so no longer require awakes from the guard_'s unlock. |
| 737 | CHECK_GE(guard_.num_contenders_, 0); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 738 | guard_.num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 739 | #else |
| 740 | guard_.recursion_count_ = 0; |
| 741 | CHECK_MUTEX_CALL(pthread_cond_wait, (&cond_, &guard_.mutex_)); |
| 742 | #endif |
| 743 | guard_.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 744 | } |
| 745 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 746 | void ConditionVariable::TimedWait(Thread* self, int64_t ms, int32_t ns) { |
| 747 | DCHECK(self == NULL || self == Thread::Current()); |
| 748 | guard_.AssertExclusiveHeld(self); |
Ian Rogers | 1d54e73 | 2013-05-02 21:10:01 -0700 | [diff] [blame] | 749 | guard_.CheckSafeToWait(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 750 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 751 | #if ART_USE_FUTEXES |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 752 | timespec rel_ts; |
Ian Rogers | 5bd97c4 | 2012-11-27 02:38:26 -0800 | [diff] [blame] | 753 | InitTimeSpec(false, CLOCK_REALTIME, ms, ns, &rel_ts); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 754 | num_waiters_++; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 755 | // Ensure the Mutex is contended so that requeued threads are awoken. |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 756 | guard_.num_contenders_++; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 757 | guard_.recursion_count_ = 1; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 758 | int32_t cur_sequence = sequence_; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 759 | guard_.ExclusiveUnlock(self); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 760 | if (futex(sequence_.Address(), FUTEX_WAIT, cur_sequence, &rel_ts, NULL, 0) != 0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 761 | if (errno == ETIMEDOUT) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 762 | // Timed out we're done. |
Brian Carlstrom | 0de7985 | 2013-07-25 22:29:58 -0700 | [diff] [blame] | 763 | } else if ((errno == EAGAIN) || (errno == EINTR)) { |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 764 | // A signal or ConditionVariable::Signal/Broadcast has come in. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 765 | } else { |
| 766 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 767 | } |
| 768 | } |
| 769 | guard_.ExclusiveLock(self); |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 770 | CHECK_GE(num_waiters_, 0); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 771 | num_waiters_--; |
Ian Rogers | d45f201 | 2012-11-28 11:46:23 -0800 | [diff] [blame] | 772 | // We awoke and so no longer require awakes from the guard_'s unlock. |
| 773 | CHECK_GE(guard_.num_contenders_, 0); |
Ian Rogers | b122a4b | 2013-11-19 18:00:50 -0800 | [diff] [blame^] | 774 | guard_.num_contenders_--; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 775 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 776 | #ifdef HAVE_TIMEDWAIT_MONOTONIC |
| 777 | #define TIMEDWAIT pthread_cond_timedwait_monotonic |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 778 | int clock = CLOCK_MONOTONIC; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 779 | #else |
| 780 | #define TIMEDWAIT pthread_cond_timedwait |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 781 | int clock = CLOCK_REALTIME; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 782 | #endif |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 783 | guard_.recursion_count_ = 0; |
| 784 | timespec ts; |
Brian Carlstrom | bcc2926 | 2012-11-02 11:36:03 -0700 | [diff] [blame] | 785 | InitTimeSpec(true, clock, ms, ns, &ts); |
| 786 | int rc = TEMP_FAILURE_RETRY(TIMEDWAIT(&cond_, &guard_.mutex_, &ts)); |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 787 | if (rc != 0 && rc != ETIMEDOUT) { |
| 788 | errno = rc; |
| 789 | PLOG(FATAL) << "TimedWait failed for " << name_; |
| 790 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 791 | #endif |
| 792 | guard_.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 793 | } |
| 794 | |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 795 | } // namespace art |