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> |
| 20 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 21 | #include "cutils/atomic.h" |
| 22 | #include "cutils/atomic-inline.h" |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 23 | #include "logging.h" |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 24 | #include "runtime.h" |
Elliott Hughes | ffb465f | 2012-03-01 18:46:05 -0800 | [diff] [blame] | 25 | #include "thread.h" |
| 26 | #include "utils.h" |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 27 | |
Elliott Hughes | b08e8a3 | 2012-04-02 10:51:41 -0700 | [diff] [blame] | 28 | #if defined(__APPLE__) |
| 29 | #include "AvailabilityMacros.h" // For MAC_OS_X_VERSION_MAX_ALLOWED |
| 30 | #endif |
| 31 | |
Elliott Hughes | 8d768a9 | 2011-09-14 16:35:25 -0700 | [diff] [blame] | 32 | #define CHECK_MUTEX_CALL(call, args) CHECK_PTHREAD_CALL(call, args, name_) |
| 33 | |
Elliott Hughes | f834936 | 2012-06-18 15:00:06 -0700 | [diff] [blame] | 34 | extern int pthread_mutex_lock(pthread_mutex_t* mutex) EXCLUSIVE_LOCK_FUNCTION(mutex); |
| 35 | extern int pthread_mutex_unlock(pthread_mutex_t* mutex) UNLOCK_FUNCTION(1); |
| 36 | extern int pthread_mutex_trylock(pthread_mutex_t* mutex) EXCLUSIVE_TRYLOCK_FUNCTION(0, mutex); |
| 37 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 38 | #if ART_USE_FUTEXES |
Ian Rogers | acc46d6 | 2012-09-27 21:39:40 -0700 | [diff] [blame] | 39 | #include "linux/futex.h" |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 40 | #include "sys/syscall.h" |
| 41 | #ifndef SYS_futex |
| 42 | #define SYS_futex __NR_futex |
| 43 | #endif |
| 44 | int futex(volatile int *uaddr, int op, int val, const struct timespec *timeout, int *, int ) { |
| 45 | return syscall(SYS_futex, uaddr, op, val, timeout, NULL, NULL); |
| 46 | } |
| 47 | #endif // ART_USE_FUTEXES |
| 48 | |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 49 | namespace art { |
| 50 | |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 51 | // 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] | 52 | struct __attribute__((__may_alias__)) darwin_pthread_mutex_t { |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 53 | long padding0; |
| 54 | int padding1; |
| 55 | uint32_t padding2; |
| 56 | int16_t padding3; |
| 57 | int16_t padding4; |
| 58 | uint32_t padding5; |
| 59 | pthread_t darwin_pthread_mutex_owner; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 60 | // ...other stuff we don't care about. |
| 61 | }; |
| 62 | |
| 63 | struct __attribute__((__may_alias__)) darwin_pthread_rwlock_t { |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 64 | long padding0; |
| 65 | pthread_mutex_t padding1; |
| 66 | int padding2; |
| 67 | pthread_cond_t padding3; |
| 68 | pthread_cond_t padding4; |
| 69 | int padding5; |
| 70 | int padding6; |
| 71 | pthread_t darwin_pthread_rwlock_owner; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 72 | // ...other stuff we don't care about. |
| 73 | }; |
| 74 | |
| 75 | struct __attribute__((__may_alias__)) glibc_pthread_mutex_t { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 76 | int32_t padding0[2]; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 77 | int owner; |
| 78 | // ...other stuff we don't care about. |
| 79 | }; |
| 80 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 81 | struct __attribute__((__may_alias__)) glibc_pthread_rwlock_t { |
| 82 | #ifdef __LP64__ |
| 83 | int32_t padding0[6]; |
| 84 | #else |
| 85 | int32_t padding0[7]; |
| 86 | #endif |
| 87 | int writer; |
| 88 | // ...other stuff we don't care about. |
| 89 | }; |
| 90 | |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 91 | static uint64_t SafeGetTid(const Thread* self) { |
| 92 | if (self != NULL) { |
| 93 | return static_cast<uint64_t>(self->GetTid()); |
| 94 | } else { |
| 95 | return static_cast<uint64_t>(GetTid()); |
| 96 | } |
| 97 | } |
| 98 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 99 | BaseMutex::BaseMutex(const char* name, LockLevel level) : level_(level), name_(name) {} |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 100 | |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 101 | static void CheckUnattachedThread(LockLevel level) NO_THREAD_SAFETY_ANALYSIS { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 102 | // The check below enumerates the cases where we expect not to be able to sanity check locks |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 103 | // on a thread. Lock checking is disabled to avoid deadlock when checking shutdown lock. |
| 104 | // TODO: tighten this check. |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 105 | if (kDebugLocking) { |
| 106 | Runtime* runtime = Runtime::Current(); |
| 107 | CHECK(runtime == NULL || !runtime->IsStarted() || runtime->IsShuttingDown() || |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 108 | level == kDefaultMutexLevel || level == kRuntimeShutdownLock || |
| 109 | level == kThreadListLock || level == kLoggingLock || level == kAbortLock); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 110 | } |
Elliott Hughes | ffb465f | 2012-03-01 18:46:05 -0800 | [diff] [blame] | 111 | } |
| 112 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 113 | void BaseMutex::RegisterAsLocked(Thread* self) { |
| 114 | if (UNLIKELY(self == NULL)) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 115 | CheckUnattachedThread(level_); |
| 116 | return; |
| 117 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 118 | if (kDebugLocking) { |
| 119 | // Check if a bad Mutex of this level or lower is held. |
| 120 | bool bad_mutexes_held = false; |
| 121 | for (int i = level_; i >= 0; --i) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 122 | BaseMutex* held_mutex = self->GetHeldMutex(static_cast<LockLevel>(i)); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 123 | if (UNLIKELY(held_mutex != NULL)) { |
| 124 | LOG(ERROR) << "Lock level violation: holding \"" << held_mutex->name_ << "\" (level " << i |
| 125 | << ") while locking \"" << name_ << "\" (level " << static_cast<int>(level_) << ")"; |
| 126 | if (i > kAbortLock) { |
| 127 | // Only abort in the check below if this is more than abort level lock. |
| 128 | bad_mutexes_held = true; |
| 129 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 130 | } |
| 131 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 132 | CHECK(!bad_mutexes_held); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 133 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 134 | // Don't record monitors as they are outside the scope of analysis. They may be inspected off of |
| 135 | // the monitor list. |
| 136 | if (level_ != kMonitorLock) { |
| 137 | self->SetHeldMutex(level_, this); |
| 138 | } |
| 139 | } |
| 140 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 141 | void BaseMutex::RegisterAsUnlocked(Thread* self) { |
| 142 | if (UNLIKELY(self == NULL)) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 143 | CheckUnattachedThread(level_); |
| 144 | return; |
| 145 | } |
| 146 | if (level_ != kMonitorLock) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 147 | if (kDebugLocking) { |
| 148 | CHECK(self->GetHeldMutex(level_) == this) << "Unlocking on unacquired mutex: " << name_; |
| 149 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 150 | self->SetHeldMutex(level_, NULL); |
| 151 | } |
| 152 | } |
| 153 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 154 | void BaseMutex::CheckSafeToWait(Thread* self) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 155 | if (self == NULL) { |
| 156 | CheckUnattachedThread(level_); |
| 157 | return; |
| 158 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 159 | if (kDebugLocking) { |
| 160 | CHECK(self->GetHeldMutex(level_) == this) << "Waiting on unacquired mutex: " << name_; |
| 161 | bool bad_mutexes_held = false; |
| 162 | for (int i = kMaxMutexLevel; i >= 0; --i) { |
| 163 | if (i != level_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 164 | BaseMutex* held_mutex = self->GetHeldMutex(static_cast<LockLevel>(i)); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 165 | if (held_mutex != NULL) { |
| 166 | LOG(ERROR) << "Holding " << held_mutex->name_ << " (level " << i |
| 167 | << ") while performing wait on: " |
| 168 | << name_ << " (level " << static_cast<int>(level_) << ")"; |
| 169 | bad_mutexes_held = true; |
| 170 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 171 | } |
| 172 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 173 | CHECK(!bad_mutexes_held); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 174 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 175 | } |
| 176 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 177 | Mutex::Mutex(const char* name, LockLevel level, bool recursive) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 178 | : BaseMutex(name, level), recursive_(recursive), recursion_count_(0) { |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 179 | #if defined(__BIONIC__) || defined(__APPLE__) |
| 180 | // Use recursive mutexes for bionic and Apple otherwise the |
| 181 | // non-recursive mutexes don't have TIDs to check lock ownership of. |
Elliott Hughes | bbd9d83 | 2011-11-07 14:40:00 -0800 | [diff] [blame] | 182 | pthread_mutexattr_t attributes; |
| 183 | CHECK_MUTEX_CALL(pthread_mutexattr_init, (&attributes)); |
| 184 | CHECK_MUTEX_CALL(pthread_mutexattr_settype, (&attributes, PTHREAD_MUTEX_RECURSIVE)); |
| 185 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, &attributes)); |
| 186 | CHECK_MUTEX_CALL(pthread_mutexattr_destroy, (&attributes)); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 187 | #else |
| 188 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, NULL)); |
| 189 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | Mutex::~Mutex() { |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 193 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 194 | // may still be using locks. |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 195 | int rc = pthread_mutex_destroy(&mutex_); |
| 196 | if (rc != 0) { |
| 197 | errno = rc; |
Elliott Hughes | b3bd5f0 | 2012-03-08 21:05:27 -0800 | [diff] [blame] | 198 | // 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^] | 199 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 200 | Runtime* runtime = Runtime::Current(); |
| 201 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDown(); |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 202 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_mutex_destroy failed for " << name_; |
| 203 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 204 | } |
| 205 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 206 | void Mutex::ExclusiveLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 207 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 208 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 209 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 210 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 211 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 212 | CHECK_MUTEX_CALL(pthread_mutex_lock, (&mutex_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 213 | RegisterAsLocked(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 214 | } |
| 215 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 216 | if (kDebugLocking) { |
| 217 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 218 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 219 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 220 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 223 | bool Mutex::ExclusiveTryLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 224 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 225 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 226 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 227 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 228 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 229 | int result = pthread_mutex_trylock(&mutex_); |
| 230 | if (result == EBUSY) { |
| 231 | return false; |
| 232 | } |
| 233 | if (result != 0) { |
| 234 | errno = result; |
| 235 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 236 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 237 | RegisterAsLocked(self); |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 238 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 239 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 240 | if (kDebugLocking) { |
| 241 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 242 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 243 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 244 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 245 | return true; |
| 246 | } |
| 247 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 248 | void Mutex::ExclusiveUnlock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 249 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 250 | AssertHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 251 | recursion_count_--; |
| 252 | if (!recursive_ || recursion_count_ == 0) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 253 | if (kDebugLocking) { |
| 254 | CHECK(recursion_count_ == 0 || recursive_) << "Unexpected recursion count on mutex: " |
| 255 | << name_ << " " << recursion_count_; |
| 256 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 257 | RegisterAsUnlocked(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 258 | CHECK_MUTEX_CALL(pthread_mutex_unlock, (&mutex_)); |
| 259 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 260 | } |
| 261 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 262 | bool Mutex::IsExclusiveHeld(const Thread* self) const { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 263 | DCHECK(self == NULL || self == Thread::Current()); |
| 264 | bool result = (GetExclusiveOwnerTid() == SafeGetTid(self)); |
| 265 | if (kDebugLocking) { |
| 266 | // Sanity debug check that if we think it is locked we have it in our held mutexes. |
| 267 | if (result && self != NULL && level_ != kMonitorLock) { |
| 268 | CHECK_EQ(self->GetHeldMutex(level_), this); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 269 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 270 | } |
| 271 | return result; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 272 | } |
| 273 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 274 | uint64_t Mutex::GetExclusiveOwnerTid() const { |
Elliott Hughes | 3147a23 | 2011-10-12 15:55:07 -0700 | [diff] [blame] | 275 | #if defined(__BIONIC__) |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 276 | return static_cast<uint64_t>((mutex_.value >> 16) & 0xffff); |
Elliott Hughes | 3147a23 | 2011-10-12 15:55:07 -0700 | [diff] [blame] | 277 | #elif defined(__GLIBC__) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 278 | return reinterpret_cast<const glibc_pthread_mutex_t*>(&mutex_)->owner; |
Elliott Hughes | cf04431 | 2012-01-23 18:48:51 -0800 | [diff] [blame] | 279 | #elif defined(__APPLE__) |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 280 | const darwin_pthread_mutex_t* dpmutex = reinterpret_cast<const darwin_pthread_mutex_t*>(&mutex_); |
| 281 | pthread_t owner = dpmutex->darwin_pthread_mutex_owner; |
Brian Carlstrom | bd93c30 | 2012-08-27 16:58:28 -0700 | [diff] [blame] | 282 | // 0 for unowned, -1 for PTHREAD_MTX_TID_SWITCHING |
| 283 | // 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] | 284 | if ((owner == (pthread_t)0) || (owner == (pthread_t)-1)) { |
| 285 | return 0; |
| 286 | } |
| 287 | uint64_t tid; |
| 288 | CHECK_PTHREAD_CALL(pthread_threadid_np, (owner, &tid), __FUNCTION__); // Requires Mac OS 10.6 |
| 289 | return tid; |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 290 | #else |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 291 | #error unsupported C library |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 292 | #endif |
| 293 | } |
| 294 | |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 295 | std::string Mutex::Dump() const { |
| 296 | return StringPrintf("%s %s level=%d count=%d owner=%llx", |
| 297 | recursive_ ? "recursive" : "non-recursive", |
| 298 | name_.c_str(), |
| 299 | static_cast<int>(level_), |
| 300 | recursion_count_, |
| 301 | GetExclusiveOwnerTid()); |
| 302 | } |
| 303 | |
| 304 | std::ostream& operator<<(std::ostream& os, const Mutex& mu) { |
| 305 | return os << mu.Dump(); |
| 306 | } |
| 307 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 308 | ReaderWriterMutex::ReaderWriterMutex(const char* name, LockLevel level) : |
| 309 | BaseMutex(name, level) |
| 310 | #if ART_USE_FUTEXES |
| 311 | , state_(0), exclusive_owner_(0), num_pending_readers_(0), num_pending_writers_(0) |
| 312 | #endif |
| 313 | { |
| 314 | #if !ART_USE_FUTEXES |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 315 | CHECK_MUTEX_CALL(pthread_rwlock_init, (&rwlock_, NULL)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 316 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | ReaderWriterMutex::~ReaderWriterMutex() { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 320 | #if ART_USE_FUTEXES |
| 321 | CHECK_EQ(state_, 0); |
| 322 | CHECK_EQ(exclusive_owner_, 0U); |
| 323 | CHECK_EQ(num_pending_readers_, 0); |
| 324 | CHECK_EQ(num_pending_writers_, 0); |
| 325 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 326 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 327 | // may still be using locks. |
| 328 | int rc = pthread_rwlock_destroy(&rwlock_); |
| 329 | if (rc != 0) { |
| 330 | errno = rc; |
| 331 | // 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^] | 332 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 333 | Runtime* runtime = Runtime::Current(); |
| 334 | bool shutting_down = runtime == NULL || runtime->IsShuttingDown(); |
| 335 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_rwlock_destroy failed for " << name_; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 336 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 337 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 338 | } |
| 339 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 340 | void ReaderWriterMutex::ExclusiveLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 341 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 342 | AssertNotExclusiveHeld(self); |
| 343 | #if ART_USE_FUTEXES |
| 344 | bool done = false; |
| 345 | do { |
| 346 | int32_t cur_state = state_; |
| 347 | if (cur_state == 0) { |
| 348 | // Change state from 0 to -1. |
| 349 | done = android_atomic_cmpxchg(0, -1, &state_) == 0; |
| 350 | } else { |
| 351 | // Failed to acquire, hang up. |
| 352 | android_atomic_inc(&num_pending_writers_); |
| 353 | if (futex(&state_, FUTEX_WAIT, cur_state, NULL, NULL, 0) != 0) { |
| 354 | if (errno != EAGAIN) { |
| 355 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 356 | } |
| 357 | } |
| 358 | android_atomic_dec(&num_pending_writers_); |
| 359 | } |
| 360 | } while(!done); |
Ian Rogers | ab47016 | 2012-09-29 23:06:53 -0700 | [diff] [blame] | 361 | DCHECK_EQ(state_, -1); |
| 362 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 363 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 364 | CHECK_MUTEX_CALL(pthread_rwlock_wrlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 365 | #endif |
| 366 | RegisterAsLocked(self); |
| 367 | AssertExclusiveHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 368 | } |
| 369 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 370 | void ReaderWriterMutex::ExclusiveUnlock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 371 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 372 | AssertExclusiveHeld(self); |
| 373 | RegisterAsUnlocked(self); |
| 374 | #if ART_USE_FUTEXES |
| 375 | bool done = false; |
| 376 | do { |
| 377 | int32_t cur_state = state_; |
| 378 | if (cur_state == -1) { |
| 379 | // We're no longer the owner. |
| 380 | exclusive_owner_ = 0; |
| 381 | // Change state from -1 to 0. |
| 382 | done = android_atomic_cmpxchg(-1, 0, &state_) == 0; |
| 383 | if (done) { // cmpxchg may fail due to noise? |
| 384 | // Wake any waiters. |
| 385 | if (num_pending_readers_ > 0 || num_pending_writers_ > 0) { |
| 386 | futex(&state_, FUTEX_WAKE, -1, NULL, NULL, 0); |
| 387 | } |
| 388 | } |
| 389 | } else { |
| 390 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 391 | } |
| 392 | } while(!done); |
| 393 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 394 | CHECK_MUTEX_CALL(pthread_rwlock_unlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 395 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 396 | } |
| 397 | |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 398 | #if HAVE_TIMED_RWLOCK |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 399 | bool ReaderWriterMutex::ExclusiveLockWithTimeout(Thread* self, const timespec& abs_timeout) { |
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 | #if ART_USE_FUTEXES |
| 402 | bool done = false; |
| 403 | do { |
| 404 | int32_t cur_state = state_; |
| 405 | if (cur_state == 0) { |
| 406 | // Change state from 0 to -1. |
| 407 | done = android_atomic_cmpxchg(0, -1, &state_) == 0; |
| 408 | } else { |
| 409 | // Failed to acquire, hang up. |
| 410 | android_atomic_inc(&num_pending_writers_); |
| 411 | if (futex(&state_, FUTEX_WAIT, cur_state, &abs_timeout, NULL, 0) != 0) { |
| 412 | if (errno == ETIMEDOUT) { |
| 413 | android_atomic_dec(&num_pending_writers_); |
| 414 | return false; |
| 415 | } else if (errno != EAGAIN) { |
| 416 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 417 | } |
| 418 | } |
| 419 | android_atomic_dec(&num_pending_writers_); |
| 420 | } |
| 421 | } while(!done); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 422 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 423 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 424 | int result = pthread_rwlock_timedwrlock(&rwlock_, &abs_timeout); |
| 425 | if (result == ETIMEDOUT) { |
| 426 | return false; |
| 427 | } |
| 428 | if (result != 0) { |
| 429 | errno = result; |
Ian Rogers | a5acfd3 | 2012-08-15 11:50:10 -0700 | [diff] [blame] | 430 | PLOG(FATAL) << "pthread_rwlock_timedwrlock failed for " << name_; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 431 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 432 | #endif |
| 433 | RegisterAsLocked(self); |
| 434 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 435 | return true; |
| 436 | } |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 437 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 438 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 439 | void ReaderWriterMutex::SharedLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 440 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 441 | #if ART_USE_FUTEXES |
| 442 | bool done = false; |
| 443 | do { |
| 444 | int32_t cur_state = state_; |
| 445 | if (cur_state >= 0) { |
| 446 | // Add as an extra reader. |
| 447 | done = android_atomic_cmpxchg(cur_state, cur_state + 1, &state_) == 0; |
| 448 | } else { |
| 449 | // Owner holds it exclusively, hang up. |
| 450 | android_atomic_inc(&num_pending_readers_); |
| 451 | if (futex(&state_, FUTEX_WAIT, cur_state, NULL, NULL, 0) != 0) { |
| 452 | if (errno != EAGAIN) { |
| 453 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 454 | } |
| 455 | } |
| 456 | android_atomic_dec(&num_pending_readers_); |
| 457 | } |
| 458 | } while(!done); |
| 459 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 460 | CHECK_MUTEX_CALL(pthread_rwlock_rdlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 461 | #endif |
| 462 | RegisterAsLocked(self); |
| 463 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 464 | } |
| 465 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 466 | bool ReaderWriterMutex::SharedTryLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 467 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 468 | #if ART_USE_FUTEXES |
| 469 | bool done = false; |
| 470 | do { |
| 471 | int32_t cur_state = state_; |
| 472 | if (cur_state >= 0) { |
| 473 | // Add as an extra reader. |
| 474 | done = android_atomic_cmpxchg(cur_state, cur_state + 1, &state_) == 0; |
| 475 | } else { |
| 476 | // Owner holds it exclusively. |
| 477 | return false; |
| 478 | } |
| 479 | } while(!done); |
| 480 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 481 | int result = pthread_rwlock_tryrdlock(&rwlock_); |
| 482 | if (result == EBUSY) { |
| 483 | return false; |
| 484 | } |
| 485 | if (result != 0) { |
| 486 | errno = result; |
| 487 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 488 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 489 | #endif |
| 490 | RegisterAsLocked(self); |
| 491 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 492 | return true; |
| 493 | } |
| 494 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 495 | void ReaderWriterMutex::SharedUnlock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 496 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 497 | AssertSharedHeld(self); |
| 498 | RegisterAsUnlocked(self); |
| 499 | #if ART_USE_FUTEXES |
| 500 | bool done = false; |
| 501 | do { |
| 502 | int32_t cur_state = state_; |
| 503 | if (LIKELY(cur_state > 0)) { |
| 504 | // Reduce state by 1. |
| 505 | done = android_atomic_cmpxchg(cur_state, cur_state - 1, &state_) == 0; |
| 506 | if (done && (cur_state - 1) == 0) { // cmpxchg may fail due to noise? |
| 507 | if (num_pending_writers_ > 0 || num_pending_readers_ > 0) { |
| 508 | // Wake any exclusive waiters as there are now no readers. |
| 509 | futex(&state_, FUTEX_WAKE, -1, NULL, NULL, 0); |
| 510 | } |
| 511 | } |
| 512 | } else { |
| 513 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 514 | } |
| 515 | } while(!done); |
| 516 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 517 | CHECK_MUTEX_CALL(pthread_rwlock_unlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 518 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 519 | } |
| 520 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 521 | bool ReaderWriterMutex::IsExclusiveHeld(const Thread* self) const { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 522 | DCHECK(self == NULL || self == Thread::Current()); |
| 523 | bool result = (GetExclusiveOwnerTid() == SafeGetTid(self)); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 524 | if (kDebugLocking) { |
| 525 | // 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] | 526 | if (self != NULL && result) { |
| 527 | CHECK_EQ(self->GetHeldMutex(level_), this); |
| 528 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 529 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 530 | return result; |
| 531 | } |
| 532 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 533 | bool ReaderWriterMutex::IsSharedHeld(const Thread* self) const { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 534 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 535 | bool result; |
| 536 | if (UNLIKELY(self == NULL)) { // Handle unattached threads. |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 537 | result = IsExclusiveHeld(self); // TODO: a better best effort here. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 538 | } else { |
| 539 | result = (self->GetHeldMutex(level_) == this); |
| 540 | } |
| 541 | return result; |
| 542 | } |
| 543 | |
| 544 | uint64_t ReaderWriterMutex::GetExclusiveOwnerTid() const { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 545 | #if ART_USE_FUTEXES |
| 546 | return exclusive_owner_; |
| 547 | #else |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 548 | #if defined(__BIONIC__) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 549 | return rwlock_.writerThreadId; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 550 | #elif defined(__GLIBC__) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 551 | return reinterpret_cast<const glibc_pthread_rwlock_t*>(&rwlock_)->writer; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 552 | #elif defined(__APPLE__) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 553 | const darwin_pthread_rwlock_t* |
| 554 | dprwlock = reinterpret_cast<const darwin_pthread_rwlock_t*>(&rwlock_); |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 555 | pthread_t owner = dprwlock->darwin_pthread_rwlock_owner; |
| 556 | if (owner == (pthread_t)0) { |
| 557 | return 0; |
| 558 | } |
| 559 | uint64_t tid; |
| 560 | CHECK_PTHREAD_CALL(pthread_threadid_np, (owner, &tid), __FUNCTION__); // Requires Mac OS 10.6 |
| 561 | return tid; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 562 | #else |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 563 | #error unsupported C library |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 564 | #endif |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 565 | #endif |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 566 | } |
| 567 | |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 568 | std::string ReaderWriterMutex::Dump() const { |
| 569 | return StringPrintf("%s level=%d owner=%llx", |
| 570 | name_.c_str(), |
| 571 | static_cast<int>(level_), |
| 572 | GetExclusiveOwnerTid()); |
| 573 | } |
| 574 | |
| 575 | std::ostream& operator<<(std::ostream& os, const ReaderWriterMutex& mu) { |
| 576 | return os << mu.Dump(); |
| 577 | } |
| 578 | |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 579 | ConditionVariable::ConditionVariable(const std::string& name) : name_(name) { |
| 580 | CHECK_MUTEX_CALL(pthread_cond_init, (&cond_, NULL)); |
| 581 | } |
| 582 | |
| 583 | ConditionVariable::~ConditionVariable() { |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 584 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 585 | // may still be using condition variables. |
| 586 | int rc = pthread_cond_destroy(&cond_); |
| 587 | if (rc != 0) { |
| 588 | errno = rc; |
Ian Rogers | 50b35e2 | 2012-10-04 10:09:15 -0700 | [diff] [blame^] | 589 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 590 | Runtime* runtime = Runtime::Current(); |
| 591 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDown(); |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 592 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_cond_destroy failed for " << name_; |
| 593 | } |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 594 | } |
| 595 | |
| 596 | void ConditionVariable::Broadcast() { |
| 597 | CHECK_MUTEX_CALL(pthread_cond_broadcast, (&cond_)); |
| 598 | } |
| 599 | |
| 600 | void ConditionVariable::Signal() { |
| 601 | CHECK_MUTEX_CALL(pthread_cond_signal, (&cond_)); |
| 602 | } |
| 603 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 604 | void ConditionVariable::Wait(Thread* self, Mutex& mutex) { |
| 605 | mutex.CheckSafeToWait(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 606 | unsigned int old_recursion_count = mutex.recursion_count_; |
| 607 | mutex.recursion_count_ = 0; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 608 | CHECK_MUTEX_CALL(pthread_cond_wait, (&cond_, &mutex.mutex_)); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 609 | mutex.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 610 | } |
| 611 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 612 | void ConditionVariable::TimedWait(Thread* self, Mutex& mutex, const timespec& ts) { |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 613 | #ifdef HAVE_TIMEDWAIT_MONOTONIC |
| 614 | #define TIMEDWAIT pthread_cond_timedwait_monotonic |
| 615 | #else |
| 616 | #define TIMEDWAIT pthread_cond_timedwait |
| 617 | #endif |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 618 | mutex.CheckSafeToWait(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 619 | unsigned int old_recursion_count = mutex.recursion_count_; |
| 620 | mutex.recursion_count_ = 0; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 621 | int rc = TIMEDWAIT(&cond_, &mutex.mutex_, &ts); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 622 | mutex.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 623 | if (rc != 0 && rc != ETIMEDOUT) { |
| 624 | errno = rc; |
| 625 | PLOG(FATAL) << "TimedWait failed for " << name_; |
| 626 | } |
| 627 | } |
| 628 | |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 629 | } // namespace art |