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 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 22 | #include "cutils/atomic.h" |
| 23 | #include "cutils/atomic-inline.h" |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 24 | #include "logging.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" |
Elliott Hughes | ffb465f | 2012-03-01 18:46:05 -0800 | [diff] [blame] | 27 | #include "thread.h" |
| 28 | #include "utils.h" |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 29 | |
Elliott Hughes | b08e8a3 | 2012-04-02 10:51:41 -0700 | [diff] [blame] | 30 | #if defined(__APPLE__) |
| 31 | #include "AvailabilityMacros.h" // For MAC_OS_X_VERSION_MAX_ALLOWED |
Ian Rogers | 27913a2 | 2012-10-19 17:33:10 -0700 | [diff] [blame] | 32 | // No clocks to specify on OS/X, fake value to pass to routines that require a clock. |
Elliott Hughes | 63af636 | 2012-10-19 18:16:36 -0700 | [diff] [blame] | 33 | #define CLOCK_REALTIME 0xebadf00d |
Elliott Hughes | b08e8a3 | 2012-04-02 10:51:41 -0700 | [diff] [blame] | 34 | #endif |
| 35 | |
Elliott Hughes | 8d768a9 | 2011-09-14 16:35:25 -0700 | [diff] [blame] | 36 | #define CHECK_MUTEX_CALL(call, args) CHECK_PTHREAD_CALL(call, args, name_) |
| 37 | |
Elliott Hughes | f834936 | 2012-06-18 15:00:06 -0700 | [diff] [blame] | 38 | extern int pthread_mutex_lock(pthread_mutex_t* mutex) EXCLUSIVE_LOCK_FUNCTION(mutex); |
| 39 | extern int pthread_mutex_unlock(pthread_mutex_t* mutex) UNLOCK_FUNCTION(1); |
| 40 | extern int pthread_mutex_trylock(pthread_mutex_t* mutex) EXCLUSIVE_TRYLOCK_FUNCTION(0, mutex); |
| 41 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 42 | #if ART_USE_FUTEXES |
Ian Rogers | acc46d6 | 2012-09-27 21:39:40 -0700 | [diff] [blame] | 43 | #include "linux/futex.h" |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 44 | #include "sys/syscall.h" |
| 45 | #ifndef SYS_futex |
| 46 | #define SYS_futex __NR_futex |
| 47 | #endif |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 48 | int futex(volatile int *uaddr, int op, int val, const struct timespec *timeout, volatile int *uaddr2, int val3) { |
| 49 | return syscall(SYS_futex, uaddr, op, val, timeout, uaddr2, val3); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 50 | } |
| 51 | #endif // ART_USE_FUTEXES |
| 52 | |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 53 | namespace art { |
| 54 | |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 55 | // 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] | 56 | struct __attribute__((__may_alias__)) darwin_pthread_mutex_t { |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 57 | long padding0; |
| 58 | int padding1; |
| 59 | uint32_t padding2; |
| 60 | int16_t padding3; |
| 61 | int16_t padding4; |
| 62 | uint32_t padding5; |
| 63 | pthread_t darwin_pthread_mutex_owner; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 64 | // ...other stuff we don't care about. |
| 65 | }; |
| 66 | |
| 67 | struct __attribute__((__may_alias__)) darwin_pthread_rwlock_t { |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 68 | long padding0; |
| 69 | pthread_mutex_t padding1; |
| 70 | int padding2; |
| 71 | pthread_cond_t padding3; |
| 72 | pthread_cond_t padding4; |
| 73 | int padding5; |
| 74 | int padding6; |
| 75 | pthread_t darwin_pthread_rwlock_owner; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 76 | // ...other stuff we don't care about. |
| 77 | }; |
| 78 | |
| 79 | struct __attribute__((__may_alias__)) glibc_pthread_mutex_t { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 80 | int32_t padding0[2]; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 81 | int owner; |
| 82 | // ...other stuff we don't care about. |
| 83 | }; |
| 84 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 85 | struct __attribute__((__may_alias__)) glibc_pthread_rwlock_t { |
| 86 | #ifdef __LP64__ |
| 87 | int32_t padding0[6]; |
| 88 | #else |
| 89 | int32_t padding0[7]; |
| 90 | #endif |
| 91 | int writer; |
| 92 | // ...other stuff we don't care about. |
| 93 | }; |
| 94 | |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 95 | static uint64_t SafeGetTid(const Thread* self) { |
| 96 | if (self != NULL) { |
| 97 | return static_cast<uint64_t>(self->GetTid()); |
| 98 | } else { |
| 99 | return static_cast<uint64_t>(GetTid()); |
| 100 | } |
| 101 | } |
| 102 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 103 | // Initialize a timespec to either an absolute or relative time. |
| 104 | static void InitTimeSpec(Thread* self, bool absolute, int clock, int64_t ms, int32_t ns, |
| 105 | timespec* ts) { |
| 106 | int64_t endSec; |
| 107 | |
| 108 | if (absolute) { |
Ian Rogers | 4c54e72 | 2012-10-15 16:12:54 -0700 | [diff] [blame] | 109 | #if !defined(__APPLE__) |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 110 | clock_gettime(clock, ts); |
Ian Rogers | 4c54e72 | 2012-10-15 16:12:54 -0700 | [diff] [blame] | 111 | #else |
| 112 | UNUSED(clock); |
| 113 | timeval tv; |
| 114 | gettimeofday(&tv, NULL); |
| 115 | ts->tv_sec = tv.tv_sec; |
| 116 | ts->tv_nsec = tv.tv_usec * 1000; |
| 117 | #endif |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 118 | } else { |
| 119 | ts->tv_sec = 0; |
| 120 | ts->tv_nsec = 0; |
| 121 | } |
| 122 | endSec = ts->tv_sec + ms / 1000; |
| 123 | if (UNLIKELY(endSec >= 0x7fffffff)) { |
| 124 | std::ostringstream ss; |
| 125 | ScopedObjectAccess soa(self); |
| 126 | self->Dump(ss); |
| 127 | LOG(INFO) << "Note: end time exceeds epoch: " << ss.str(); |
| 128 | endSec = 0x7ffffffe; |
| 129 | } |
| 130 | ts->tv_sec = endSec; |
| 131 | ts->tv_nsec = (ts->tv_nsec + (ms % 1000) * 1000000) + ns; |
| 132 | |
| 133 | // Catch rollover. |
| 134 | if (ts->tv_nsec >= 1000000000L) { |
| 135 | ts->tv_sec++; |
| 136 | ts->tv_nsec -= 1000000000L; |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | #if ART_USE_FUTEXES |
| 141 | static bool ComputeRelativeTimeSpec(timespec* result_ts, const timespec& lhs, const timespec& rhs) { |
| 142 | const long int one_sec = 1000 * 1000 * 1000; // one second in nanoseconds. |
| 143 | result_ts->tv_sec = lhs.tv_sec - rhs.tv_sec; |
| 144 | result_ts->tv_nsec = lhs.tv_nsec - rhs.tv_nsec; |
| 145 | if (result_ts->tv_nsec < 0) { |
| 146 | result_ts->tv_sec--; |
| 147 | result_ts->tv_nsec += one_sec; |
| 148 | } else if (result_ts->tv_nsec > one_sec) { |
| 149 | result_ts->tv_sec++; |
| 150 | result_ts->tv_nsec -= one_sec; |
| 151 | } |
| 152 | return result_ts->tv_sec < 0; |
| 153 | } |
| 154 | #endif |
| 155 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 156 | BaseMutex::BaseMutex(const char* name, LockLevel level) : level_(level), name_(name) {} |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 157 | |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 158 | static void CheckUnattachedThread(LockLevel level) NO_THREAD_SAFETY_ANALYSIS { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 159 | // 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] | 160 | // on a thread. Lock checking is disabled to avoid deadlock when checking shutdown lock. |
| 161 | // TODO: tighten this check. |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 162 | if (kDebugLocking) { |
| 163 | Runtime* runtime = Runtime::Current(); |
| 164 | CHECK(runtime == NULL || !runtime->IsStarted() || runtime->IsShuttingDown() || |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 165 | level == kDefaultMutexLevel || level == kRuntimeShutdownLock || |
| 166 | level == kThreadListLock || level == kLoggingLock || level == kAbortLock); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 167 | } |
Elliott Hughes | ffb465f | 2012-03-01 18:46:05 -0800 | [diff] [blame] | 168 | } |
| 169 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 170 | void BaseMutex::RegisterAsLocked(Thread* self) { |
| 171 | if (UNLIKELY(self == NULL)) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 172 | CheckUnattachedThread(level_); |
| 173 | return; |
| 174 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 175 | if (kDebugLocking) { |
| 176 | // Check if a bad Mutex of this level or lower is held. |
| 177 | bool bad_mutexes_held = false; |
| 178 | for (int i = level_; i >= 0; --i) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 179 | BaseMutex* held_mutex = self->GetHeldMutex(static_cast<LockLevel>(i)); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 180 | if (UNLIKELY(held_mutex != NULL)) { |
| 181 | LOG(ERROR) << "Lock level violation: holding \"" << held_mutex->name_ << "\" (level " << i |
| 182 | << ") while locking \"" << name_ << "\" (level " << static_cast<int>(level_) << ")"; |
| 183 | if (i > kAbortLock) { |
| 184 | // Only abort in the check below if this is more than abort level lock. |
| 185 | bad_mutexes_held = true; |
| 186 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 187 | } |
| 188 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 189 | CHECK(!bad_mutexes_held); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 190 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 191 | // Don't record monitors as they are outside the scope of analysis. They may be inspected off of |
| 192 | // the monitor list. |
| 193 | if (level_ != kMonitorLock) { |
| 194 | self->SetHeldMutex(level_, this); |
| 195 | } |
| 196 | } |
| 197 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 198 | void BaseMutex::RegisterAsUnlocked(Thread* self) { |
| 199 | if (UNLIKELY(self == NULL)) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 200 | CheckUnattachedThread(level_); |
| 201 | return; |
| 202 | } |
| 203 | if (level_ != kMonitorLock) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 204 | if (kDebugLocking) { |
| 205 | CHECK(self->GetHeldMutex(level_) == this) << "Unlocking on unacquired mutex: " << name_; |
| 206 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 207 | self->SetHeldMutex(level_, NULL); |
| 208 | } |
| 209 | } |
| 210 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 211 | void BaseMutex::CheckSafeToWait(Thread* self) { |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 212 | if (self == NULL) { |
| 213 | CheckUnattachedThread(level_); |
| 214 | return; |
| 215 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 216 | if (kDebugLocking) { |
| 217 | CHECK(self->GetHeldMutex(level_) == this) << "Waiting on unacquired mutex: " << name_; |
| 218 | bool bad_mutexes_held = false; |
| 219 | for (int i = kMaxMutexLevel; i >= 0; --i) { |
| 220 | if (i != level_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 221 | BaseMutex* held_mutex = self->GetHeldMutex(static_cast<LockLevel>(i)); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 222 | if (held_mutex != NULL) { |
| 223 | LOG(ERROR) << "Holding " << held_mutex->name_ << " (level " << i |
| 224 | << ") while performing wait on: " |
| 225 | << name_ << " (level " << static_cast<int>(level_) << ")"; |
| 226 | bad_mutexes_held = true; |
| 227 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 228 | } |
| 229 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 230 | CHECK(!bad_mutexes_held); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 231 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 232 | } |
| 233 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 234 | Mutex::Mutex(const char* name, LockLevel level, bool recursive) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 235 | : BaseMutex(name, level), recursive_(recursive), recursion_count_(0) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 236 | #if ART_USE_FUTEXES |
| 237 | state_ = 0; |
| 238 | exclusive_owner_ = 0; |
| 239 | num_contenders_ = 0; |
| 240 | #elif defined(__BIONIC__) || defined(__APPLE__) |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 241 | // Use recursive mutexes for bionic and Apple otherwise the |
| 242 | // non-recursive mutexes don't have TIDs to check lock ownership of. |
Elliott Hughes | bbd9d83 | 2011-11-07 14:40:00 -0800 | [diff] [blame] | 243 | pthread_mutexattr_t attributes; |
| 244 | CHECK_MUTEX_CALL(pthread_mutexattr_init, (&attributes)); |
| 245 | CHECK_MUTEX_CALL(pthread_mutexattr_settype, (&attributes, PTHREAD_MUTEX_RECURSIVE)); |
| 246 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, &attributes)); |
| 247 | CHECK_MUTEX_CALL(pthread_mutexattr_destroy, (&attributes)); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 248 | #else |
| 249 | CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, NULL)); |
| 250 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | Mutex::~Mutex() { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 254 | #if ART_USE_FUTEXES |
| 255 | if (state_ != 0) { |
| 256 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
| 257 | Runtime* runtime = Runtime::Current(); |
| 258 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDown(); |
| 259 | LOG(shutting_down ? WARNING : FATAL) << "destroying mutex with owner: " << exclusive_owner_; |
| 260 | } else { |
| 261 | CHECK_EQ(exclusive_owner_, 0U) << "unexpectedly found an owner on unlocked mutex " << name_; |
| 262 | CHECK_EQ(num_contenders_, 0) << "unexpectedly found a contender on mutex " << name_; |
| 263 | } |
| 264 | #else |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 265 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 266 | // may still be using locks. |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 267 | int rc = pthread_mutex_destroy(&mutex_); |
| 268 | if (rc != 0) { |
| 269 | errno = rc; |
Elliott Hughes | b3bd5f0 | 2012-03-08 21:05:27 -0800 | [diff] [blame] | 270 | // 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] | 271 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 272 | Runtime* runtime = Runtime::Current(); |
| 273 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDown(); |
Elliott Hughes | 6b35575 | 2012-01-13 16:49:08 -0800 | [diff] [blame] | 274 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_mutex_destroy failed for " << name_; |
| 275 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 276 | #endif |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 277 | } |
| 278 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 279 | void Mutex::ExclusiveLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 280 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 281 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 282 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 283 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 284 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 285 | #if ART_USE_FUTEXES |
| 286 | bool done = false; |
| 287 | do { |
| 288 | int32_t cur_state = state_; |
| 289 | if (cur_state == 0) { |
| 290 | // Change state from 0 to 1. |
| 291 | done = android_atomic_cmpxchg(0, 1, &state_) == 0; |
| 292 | } else { |
| 293 | // Failed to acquire, hang up. |
| 294 | android_atomic_inc(&num_contenders_); |
| 295 | if (futex(&state_, FUTEX_WAIT, 1, NULL, NULL, 0) != 0) { |
| 296 | if (errno != EAGAIN) { |
| 297 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 298 | } |
| 299 | } |
| 300 | android_atomic_dec(&num_contenders_); |
| 301 | } |
| 302 | } while(!done); |
| 303 | DCHECK_EQ(state_, 1); |
| 304 | exclusive_owner_ = SafeGetTid(self); |
| 305 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 306 | CHECK_MUTEX_CALL(pthread_mutex_lock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 307 | #endif |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 308 | RegisterAsLocked(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 309 | } |
| 310 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 311 | if (kDebugLocking) { |
| 312 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 313 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 314 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 315 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 316 | } |
| 317 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 318 | bool Mutex::ExclusiveTryLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 319 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 320 | if (kDebugLocking && !recursive_) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 321 | AssertNotHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 322 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 323 | if (!recursive_ || !IsExclusiveHeld(self)) { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 324 | #if ART_USE_FUTEXES |
| 325 | bool done = false; |
| 326 | do { |
| 327 | int32_t cur_state = state_; |
| 328 | if (cur_state == 0) { |
| 329 | // Change state from 0 to 1. |
| 330 | done = android_atomic_cmpxchg(0, 1, &state_) == 0; |
| 331 | } else { |
| 332 | return false; |
| 333 | } |
| 334 | } while(!done); |
| 335 | DCHECK_EQ(state_, 1); |
| 336 | exclusive_owner_ = SafeGetTid(self); |
| 337 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 338 | int result = pthread_mutex_trylock(&mutex_); |
| 339 | if (result == EBUSY) { |
| 340 | return false; |
| 341 | } |
| 342 | if (result != 0) { |
| 343 | errno = result; |
| 344 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 345 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 346 | #endif |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 347 | RegisterAsLocked(self); |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 348 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 349 | recursion_count_++; |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 350 | if (kDebugLocking) { |
| 351 | CHECK(recursion_count_ == 1 || recursive_) << "Unexpected recursion count on mutex: " |
| 352 | << name_ << " " << recursion_count_; |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 353 | AssertHeld(self); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 354 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 355 | return true; |
| 356 | } |
| 357 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 358 | void Mutex::ExclusiveUnlock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 359 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 360 | AssertHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 361 | recursion_count_--; |
| 362 | if (!recursive_ || recursion_count_ == 0) { |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 363 | if (kDebugLocking) { |
| 364 | CHECK(recursion_count_ == 0 || recursive_) << "Unexpected recursion count on mutex: " |
| 365 | << name_ << " " << recursion_count_; |
| 366 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 367 | RegisterAsUnlocked(self); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 368 | #if ART_USE_FUTEXES |
| 369 | bool done = false; |
| 370 | do { |
| 371 | int32_t cur_state = state_; |
| 372 | if (cur_state == 1) { |
| 373 | // We're no longer the owner. |
| 374 | exclusive_owner_ = 0; |
| 375 | // Change state to 0. |
| 376 | done = android_atomic_cmpxchg(cur_state, 0, &state_) == 0; |
| 377 | if (done) { // Spurious fail? |
| 378 | // Wake a contender |
| 379 | if (num_contenders_ > 0) { |
| 380 | futex(&state_, FUTEX_WAKE, 1, NULL, NULL, 0); |
| 381 | } |
| 382 | } |
| 383 | } else { |
| 384 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 385 | } |
| 386 | } while(!done); |
| 387 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 388 | CHECK_MUTEX_CALL(pthread_mutex_unlock, (&mutex_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 389 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 390 | } |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 391 | } |
| 392 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 393 | bool Mutex::IsExclusiveHeld(const Thread* self) const { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 394 | DCHECK(self == NULL || self == Thread::Current()); |
| 395 | bool result = (GetExclusiveOwnerTid() == SafeGetTid(self)); |
| 396 | if (kDebugLocking) { |
| 397 | // Sanity debug check that if we think it is locked we have it in our held mutexes. |
| 398 | if (result && self != NULL && level_ != kMonitorLock) { |
| 399 | CHECK_EQ(self->GetHeldMutex(level_), this); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 400 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 401 | } |
| 402 | return result; |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 403 | } |
| 404 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 405 | uint64_t Mutex::GetExclusiveOwnerTid() const { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 406 | #if ART_USE_FUTEXES |
| 407 | return exclusive_owner_; |
| 408 | #elif defined(__BIONIC__) |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 409 | return static_cast<uint64_t>((mutex_.value >> 16) & 0xffff); |
Elliott Hughes | 3147a23 | 2011-10-12 15:55:07 -0700 | [diff] [blame] | 410 | #elif defined(__GLIBC__) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 411 | return reinterpret_cast<const glibc_pthread_mutex_t*>(&mutex_)->owner; |
Elliott Hughes | cf04431 | 2012-01-23 18:48:51 -0800 | [diff] [blame] | 412 | #elif defined(__APPLE__) |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 413 | const darwin_pthread_mutex_t* dpmutex = reinterpret_cast<const darwin_pthread_mutex_t*>(&mutex_); |
| 414 | pthread_t owner = dpmutex->darwin_pthread_mutex_owner; |
Brian Carlstrom | bd93c30 | 2012-08-27 16:58:28 -0700 | [diff] [blame] | 415 | // 0 for unowned, -1 for PTHREAD_MTX_TID_SWITCHING |
| 416 | // 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] | 417 | if ((owner == (pthread_t)0) || (owner == (pthread_t)-1)) { |
| 418 | return 0; |
| 419 | } |
| 420 | uint64_t tid; |
| 421 | CHECK_PTHREAD_CALL(pthread_threadid_np, (owner, &tid), __FUNCTION__); // Requires Mac OS 10.6 |
| 422 | return tid; |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 423 | #else |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 424 | #error unsupported C library |
Elliott Hughes | 8daa092 | 2011-09-11 13:46:25 -0700 | [diff] [blame] | 425 | #endif |
| 426 | } |
| 427 | |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 428 | std::string Mutex::Dump() const { |
| 429 | return StringPrintf("%s %s level=%d count=%d owner=%llx", |
| 430 | recursive_ ? "recursive" : "non-recursive", |
| 431 | name_.c_str(), |
| 432 | static_cast<int>(level_), |
| 433 | recursion_count_, |
| 434 | GetExclusiveOwnerTid()); |
| 435 | } |
| 436 | |
| 437 | std::ostream& operator<<(std::ostream& os, const Mutex& mu) { |
| 438 | return os << mu.Dump(); |
| 439 | } |
| 440 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 441 | ReaderWriterMutex::ReaderWriterMutex(const char* name, LockLevel level) : |
| 442 | BaseMutex(name, level) |
| 443 | #if ART_USE_FUTEXES |
| 444 | , state_(0), exclusive_owner_(0), num_pending_readers_(0), num_pending_writers_(0) |
| 445 | #endif |
| 446 | { |
| 447 | #if !ART_USE_FUTEXES |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 448 | CHECK_MUTEX_CALL(pthread_rwlock_init, (&rwlock_, NULL)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 449 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | ReaderWriterMutex::~ReaderWriterMutex() { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 453 | #if ART_USE_FUTEXES |
| 454 | CHECK_EQ(state_, 0); |
| 455 | CHECK_EQ(exclusive_owner_, 0U); |
| 456 | CHECK_EQ(num_pending_readers_, 0); |
| 457 | CHECK_EQ(num_pending_writers_, 0); |
| 458 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 459 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 460 | // may still be using locks. |
| 461 | int rc = pthread_rwlock_destroy(&rwlock_); |
| 462 | if (rc != 0) { |
| 463 | errno = rc; |
| 464 | // 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] | 465 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 466 | Runtime* runtime = Runtime::Current(); |
| 467 | bool shutting_down = runtime == NULL || runtime->IsShuttingDown(); |
| 468 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_rwlock_destroy failed for " << name_; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 469 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 470 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 471 | } |
| 472 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 473 | void ReaderWriterMutex::ExclusiveLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 474 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 475 | AssertNotExclusiveHeld(self); |
| 476 | #if ART_USE_FUTEXES |
| 477 | bool done = false; |
| 478 | do { |
| 479 | int32_t cur_state = state_; |
| 480 | if (cur_state == 0) { |
| 481 | // Change state from 0 to -1. |
| 482 | done = android_atomic_cmpxchg(0, -1, &state_) == 0; |
| 483 | } else { |
| 484 | // Failed to acquire, hang up. |
| 485 | android_atomic_inc(&num_pending_writers_); |
| 486 | if (futex(&state_, FUTEX_WAIT, cur_state, NULL, NULL, 0) != 0) { |
| 487 | if (errno != EAGAIN) { |
| 488 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 489 | } |
| 490 | } |
| 491 | android_atomic_dec(&num_pending_writers_); |
| 492 | } |
| 493 | } while(!done); |
Ian Rogers | ab47016 | 2012-09-29 23:06:53 -0700 | [diff] [blame] | 494 | DCHECK_EQ(state_, -1); |
| 495 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 496 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 497 | CHECK_MUTEX_CALL(pthread_rwlock_wrlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 498 | #endif |
| 499 | RegisterAsLocked(self); |
| 500 | AssertExclusiveHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 501 | } |
| 502 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 503 | void ReaderWriterMutex::ExclusiveUnlock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 504 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 505 | AssertExclusiveHeld(self); |
| 506 | RegisterAsUnlocked(self); |
| 507 | #if ART_USE_FUTEXES |
| 508 | bool done = false; |
| 509 | do { |
| 510 | int32_t cur_state = state_; |
| 511 | if (cur_state == -1) { |
| 512 | // We're no longer the owner. |
| 513 | exclusive_owner_ = 0; |
| 514 | // Change state from -1 to 0. |
| 515 | done = android_atomic_cmpxchg(-1, 0, &state_) == 0; |
| 516 | if (done) { // cmpxchg may fail due to noise? |
| 517 | // Wake any waiters. |
| 518 | if (num_pending_readers_ > 0 || num_pending_writers_ > 0) { |
| 519 | futex(&state_, FUTEX_WAKE, -1, NULL, NULL, 0); |
| 520 | } |
| 521 | } |
| 522 | } else { |
| 523 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 524 | } |
| 525 | } while(!done); |
| 526 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 527 | CHECK_MUTEX_CALL(pthread_rwlock_unlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 528 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 529 | } |
| 530 | |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 531 | #if HAVE_TIMED_RWLOCK |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 532 | bool ReaderWriterMutex::ExclusiveLockWithTimeout(Thread* self, int64_t ms, int32_t ns) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 533 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 534 | #if ART_USE_FUTEXES |
| 535 | bool done = false; |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 536 | timespec end_abs_ts; |
| 537 | InitTimeSpec(self, true, CLOCK_REALTIME, ms, ns, &end_abs_ts); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 538 | do { |
| 539 | int32_t cur_state = state_; |
| 540 | if (cur_state == 0) { |
| 541 | // Change state from 0 to -1. |
| 542 | done = android_atomic_cmpxchg(0, -1, &state_) == 0; |
| 543 | } else { |
| 544 | // Failed to acquire, hang up. |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 545 | timespec now_abs_ts; |
| 546 | InitTimeSpec(self, true, CLOCK_REALTIME, 0, 0, &now_abs_ts); |
| 547 | timespec rel_ts; |
| 548 | if (ComputeRelativeTimeSpec(&rel_ts, end_abs_ts, now_abs_ts)) { |
| 549 | return false; // Timed out. |
| 550 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 551 | android_atomic_inc(&num_pending_writers_); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 552 | if (futex(&state_, FUTEX_WAIT, cur_state, &rel_ts, NULL, 0) != 0) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 553 | if (errno == ETIMEDOUT) { |
| 554 | android_atomic_dec(&num_pending_writers_); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 555 | return false; // Timed out. |
| 556 | } else if (errno != EAGAIN && errno != EINTR) { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 557 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 558 | } |
| 559 | } |
| 560 | android_atomic_dec(&num_pending_writers_); |
| 561 | } |
| 562 | } while(!done); |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 563 | exclusive_owner_ = SafeGetTid(self); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 564 | #else |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 565 | timespec ts; |
| 566 | InitTimeSpec(self, true, CLOCK_REALTIME, ms, ns, &ts); |
| 567 | int result = pthread_rwlock_timedwrlock(&rwlock_, &ts); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 568 | if (result == ETIMEDOUT) { |
| 569 | return false; |
| 570 | } |
| 571 | if (result != 0) { |
| 572 | errno = result; |
Ian Rogers | a5acfd3 | 2012-08-15 11:50:10 -0700 | [diff] [blame] | 573 | PLOG(FATAL) << "pthread_rwlock_timedwrlock failed for " << name_; |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 574 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 575 | #endif |
| 576 | RegisterAsLocked(self); |
| 577 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 578 | return true; |
| 579 | } |
Ian Rogers | 66aee5c | 2012-08-15 17:17:47 -0700 | [diff] [blame] | 580 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 581 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 582 | void ReaderWriterMutex::SharedLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 583 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 584 | #if ART_USE_FUTEXES |
| 585 | bool done = false; |
| 586 | do { |
| 587 | int32_t cur_state = state_; |
| 588 | if (cur_state >= 0) { |
| 589 | // Add as an extra reader. |
| 590 | done = android_atomic_cmpxchg(cur_state, cur_state + 1, &state_) == 0; |
| 591 | } else { |
| 592 | // Owner holds it exclusively, hang up. |
| 593 | android_atomic_inc(&num_pending_readers_); |
| 594 | if (futex(&state_, FUTEX_WAIT, cur_state, NULL, NULL, 0) != 0) { |
| 595 | if (errno != EAGAIN) { |
| 596 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 597 | } |
| 598 | } |
| 599 | android_atomic_dec(&num_pending_readers_); |
| 600 | } |
| 601 | } while(!done); |
| 602 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 603 | CHECK_MUTEX_CALL(pthread_rwlock_rdlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 604 | #endif |
| 605 | RegisterAsLocked(self); |
| 606 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 607 | } |
| 608 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 609 | bool ReaderWriterMutex::SharedTryLock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 610 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 611 | #if ART_USE_FUTEXES |
| 612 | bool done = false; |
| 613 | do { |
| 614 | int32_t cur_state = state_; |
| 615 | if (cur_state >= 0) { |
| 616 | // Add as an extra reader. |
| 617 | done = android_atomic_cmpxchg(cur_state, cur_state + 1, &state_) == 0; |
| 618 | } else { |
| 619 | // Owner holds it exclusively. |
| 620 | return false; |
| 621 | } |
| 622 | } while(!done); |
| 623 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 624 | int result = pthread_rwlock_tryrdlock(&rwlock_); |
| 625 | if (result == EBUSY) { |
| 626 | return false; |
| 627 | } |
| 628 | if (result != 0) { |
| 629 | errno = result; |
| 630 | PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_; |
| 631 | } |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 632 | #endif |
| 633 | RegisterAsLocked(self); |
| 634 | AssertSharedHeld(self); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 635 | return true; |
| 636 | } |
| 637 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 638 | void ReaderWriterMutex::SharedUnlock(Thread* self) { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 639 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 640 | AssertSharedHeld(self); |
| 641 | RegisterAsUnlocked(self); |
| 642 | #if ART_USE_FUTEXES |
| 643 | bool done = false; |
| 644 | do { |
| 645 | int32_t cur_state = state_; |
| 646 | if (LIKELY(cur_state > 0)) { |
| 647 | // Reduce state by 1. |
| 648 | done = android_atomic_cmpxchg(cur_state, cur_state - 1, &state_) == 0; |
| 649 | if (done && (cur_state - 1) == 0) { // cmpxchg may fail due to noise? |
| 650 | if (num_pending_writers_ > 0 || num_pending_readers_ > 0) { |
| 651 | // Wake any exclusive waiters as there are now no readers. |
| 652 | futex(&state_, FUTEX_WAKE, -1, NULL, NULL, 0); |
| 653 | } |
| 654 | } |
| 655 | } else { |
| 656 | LOG(FATAL) << "Unexpected state_:" << cur_state << " for " << name_; |
| 657 | } |
| 658 | } while(!done); |
| 659 | #else |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 660 | CHECK_MUTEX_CALL(pthread_rwlock_unlock, (&rwlock_)); |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 661 | #endif |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 662 | } |
| 663 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 664 | bool ReaderWriterMutex::IsExclusiveHeld(const Thread* self) const { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 665 | DCHECK(self == NULL || self == Thread::Current()); |
| 666 | bool result = (GetExclusiveOwnerTid() == SafeGetTid(self)); |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 667 | if (kDebugLocking) { |
| 668 | // 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] | 669 | if (self != NULL && result) { |
| 670 | CHECK_EQ(self->GetHeldMutex(level_), this); |
| 671 | } |
Ian Rogers | 25fd14b | 2012-09-05 10:56:38 -0700 | [diff] [blame] | 672 | } |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 673 | return result; |
| 674 | } |
| 675 | |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 676 | bool ReaderWriterMutex::IsSharedHeld(const Thread* self) const { |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 677 | DCHECK(self == NULL || self == Thread::Current()); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 678 | bool result; |
| 679 | if (UNLIKELY(self == NULL)) { // Handle unattached threads. |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 680 | result = IsExclusiveHeld(self); // TODO: a better best effort here. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 681 | } else { |
| 682 | result = (self->GetHeldMutex(level_) == this); |
| 683 | } |
| 684 | return result; |
| 685 | } |
| 686 | |
| 687 | uint64_t ReaderWriterMutex::GetExclusiveOwnerTid() const { |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 688 | #if ART_USE_FUTEXES |
| 689 | return exclusive_owner_; |
| 690 | #else |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 691 | #if defined(__BIONIC__) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 692 | return rwlock_.writerThreadId; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 693 | #elif defined(__GLIBC__) |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 694 | return reinterpret_cast<const glibc_pthread_rwlock_t*>(&rwlock_)->writer; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 695 | #elif defined(__APPLE__) |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 696 | const darwin_pthread_rwlock_t* |
| 697 | dprwlock = reinterpret_cast<const darwin_pthread_rwlock_t*>(&rwlock_); |
Brian Carlstrom | f3a2641 | 2012-08-24 11:06:02 -0700 | [diff] [blame] | 698 | pthread_t owner = dprwlock->darwin_pthread_rwlock_owner; |
| 699 | if (owner == (pthread_t)0) { |
| 700 | return 0; |
| 701 | } |
| 702 | uint64_t tid; |
| 703 | CHECK_PTHREAD_CALL(pthread_threadid_np, (owner, &tid), __FUNCTION__); // Requires Mac OS 10.6 |
| 704 | return tid; |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 705 | #else |
Elliott Hughes | f149843 | 2012-03-28 19:34:27 -0700 | [diff] [blame] | 706 | #error unsupported C library |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 707 | #endif |
Ian Rogers | 81d425b | 2012-09-27 16:03:43 -0700 | [diff] [blame] | 708 | #endif |
Brian Carlstrom | cd74c4b | 2012-01-23 13:21:00 -0800 | [diff] [blame] | 709 | } |
| 710 | |
Ian Rogers | 01ae580 | 2012-09-28 16:14:01 -0700 | [diff] [blame] | 711 | std::string ReaderWriterMutex::Dump() const { |
| 712 | return StringPrintf("%s level=%d owner=%llx", |
| 713 | name_.c_str(), |
| 714 | static_cast<int>(level_), |
| 715 | GetExclusiveOwnerTid()); |
| 716 | } |
| 717 | |
| 718 | std::ostream& operator<<(std::ostream& os, const ReaderWriterMutex& mu) { |
| 719 | return os << mu.Dump(); |
| 720 | } |
| 721 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 722 | ConditionVariable::ConditionVariable(const std::string& name, Mutex& guard) |
| 723 | : name_(name), guard_(guard) { |
| 724 | #if ART_USE_FUTEXES |
| 725 | state_ = 0; |
| 726 | num_waiters_ = 0; |
| 727 | num_awoken_ = 0; |
| 728 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 729 | CHECK_MUTEX_CALL(pthread_cond_init, (&cond_, NULL)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 730 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 731 | } |
| 732 | |
| 733 | ConditionVariable::~ConditionVariable() { |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 734 | #if !ART_USE_FUTEXES |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 735 | // We can't use CHECK_MUTEX_CALL here because on shutdown a suspended daemon thread |
| 736 | // may still be using condition variables. |
| 737 | int rc = pthread_cond_destroy(&cond_); |
| 738 | if (rc != 0) { |
| 739 | errno = rc; |
Ian Rogers | 50b35e2 | 2012-10-04 10:09:15 -0700 | [diff] [blame] | 740 | MutexLock mu(Thread::Current(), *Locks::runtime_shutdown_lock_); |
Ian Rogers | 120f1c7 | 2012-09-28 17:17:10 -0700 | [diff] [blame] | 741 | Runtime* runtime = Runtime::Current(); |
| 742 | bool shutting_down = (runtime == NULL) || runtime->IsShuttingDown(); |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 743 | PLOG(shutting_down ? WARNING : FATAL) << "pthread_cond_destroy failed for " << name_; |
| 744 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 745 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 746 | } |
| 747 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 748 | void ConditionVariable::Broadcast(Thread* self) { |
| 749 | DCHECK(self == NULL || self == Thread::Current()); |
| 750 | // TODO: enable below, there's a race in thread creation that causes false failures currently. |
| 751 | // guard_.AssertExclusiveHeld(self); |
Mathieu Chartier | e46cd75 | 2012-10-31 16:56:18 -0700 | [diff] [blame^] | 752 | DCHECK_EQ(guard_.GetExclusiveOwnerTid(), SafeGetTid(self)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 753 | #if ART_USE_FUTEXES |
| 754 | if (num_waiters_ > 0) { |
| 755 | android_atomic_inc(&state_); // Indicate a wake has occurred to waiters coming in. |
| 756 | bool done = false; |
| 757 | do { |
| 758 | int32_t cur_state = state_; |
| 759 | // Compute number of waiters requeued and add to mutex contenders. |
| 760 | int32_t num_requeued = num_waiters_ - num_awoken_; |
| 761 | android_atomic_add(num_requeued, &guard_.num_contenders_); |
| 762 | // Requeue waiters onto contenders. |
| 763 | done = futex(&state_, FUTEX_CMP_REQUEUE, 0, |
| 764 | reinterpret_cast<const timespec*>(std::numeric_limits<int32_t>::max()), |
| 765 | &guard_.state_, cur_state) != -1; |
| 766 | if (!done) { |
| 767 | if (errno != EAGAIN) { |
| 768 | PLOG(FATAL) << "futex cmp requeue failed for " << name_; |
| 769 | } |
| 770 | } else { |
| 771 | num_awoken_ = num_waiters_; |
| 772 | } |
| 773 | } while (!done); |
| 774 | } |
| 775 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 776 | CHECK_MUTEX_CALL(pthread_cond_broadcast, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 777 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 778 | } |
| 779 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 780 | void ConditionVariable::Signal(Thread* self) { |
| 781 | DCHECK(self == NULL || self == Thread::Current()); |
| 782 | guard_.AssertExclusiveHeld(self); |
| 783 | #if ART_USE_FUTEXES |
| 784 | if (num_waiters_ > 0) { |
| 785 | android_atomic_inc(&state_); // Indicate a wake has occurred to waiters coming in. |
| 786 | // Futex wake 1 waiter who will then come and in contend on mutex. It'd be nice to requeue them |
| 787 | // to avoid this, however, requeueing can only move all waiters. |
| 788 | if (futex(&state_, FUTEX_WAKE, 1, NULL, NULL, 0) == 1) { |
| 789 | // Wake success. |
| 790 | // We weren't requeued, however, to make accounting simpler in the Wait code, increment the |
| 791 | // number of contenders on the mutex. |
| 792 | num_awoken_++; |
| 793 | android_atomic_inc(&guard_.num_contenders_); |
| 794 | } |
| 795 | } |
| 796 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 797 | CHECK_MUTEX_CALL(pthread_cond_signal, (&cond_)); |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 798 | #endif |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 799 | } |
| 800 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 801 | void ConditionVariable::Wait(Thread* self) { |
| 802 | DCHECK(self == NULL || self == Thread::Current()); |
| 803 | guard_.AssertExclusiveHeld(self); |
| 804 | guard_.CheckSafeToWait(self); |
| 805 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 806 | #if ART_USE_FUTEXES |
| 807 | int32_t cur_state = state_; |
| 808 | num_waiters_++; |
| 809 | guard_.recursion_count_ = 1; |
| 810 | guard_.ExclusiveUnlock(self); |
| 811 | bool woken = true; |
| 812 | while (futex(&state_, FUTEX_WAIT, cur_state, NULL, NULL, 0) != 0) { |
| 813 | if (errno == EINTR || errno == EAGAIN) { |
| 814 | if (state_ != cur_state) { |
| 815 | // We failed and a signal has come in. |
| 816 | woken = false; |
| 817 | break; |
| 818 | } |
| 819 | } else { |
| 820 | PLOG(FATAL) << "futex wait failed for " << name_; |
| 821 | } |
| 822 | } |
| 823 | guard_.ExclusiveLock(self); |
| 824 | num_waiters_--; |
| 825 | if (woken) { |
| 826 | // If we were woken we were requeued on the mutex, decrement the mutex's contender count. |
| 827 | android_atomic_dec(&guard_.num_contenders_); |
| 828 | num_awoken_--; |
| 829 | } |
| 830 | #else |
| 831 | guard_.recursion_count_ = 0; |
| 832 | CHECK_MUTEX_CALL(pthread_cond_wait, (&cond_, &guard_.mutex_)); |
| 833 | #endif |
| 834 | guard_.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 835 | } |
| 836 | |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 837 | void ConditionVariable::TimedWait(Thread* self, int64_t ms, int32_t ns) { |
| 838 | DCHECK(self == NULL || self == Thread::Current()); |
| 839 | guard_.AssertExclusiveHeld(self); |
| 840 | guard_.CheckSafeToWait(self); |
| 841 | unsigned int old_recursion_count = guard_.recursion_count_; |
| 842 | #if ART_USE_FUTEXES |
| 843 | // Record the original end time so that if the futex call fails we can recompute the appropriate |
| 844 | // relative time. |
| 845 | timespec end_abs_ts; |
| 846 | InitTimeSpec(self, true, CLOCK_REALTIME, ms, ns, &end_abs_ts); |
| 847 | timespec rel_ts; |
| 848 | InitTimeSpec(self, false, CLOCK_REALTIME, ms, ns, &rel_ts); |
| 849 | // Read state so that we can know if a signal comes in during before we sleep. |
| 850 | int32_t cur_state = state_; |
| 851 | num_waiters_++; |
| 852 | guard_.recursion_count_ = 1; |
| 853 | guard_.ExclusiveUnlock(self); |
| 854 | bool woken = true; // Did the futex wait end because we were awoken? |
| 855 | while (futex(&state_, FUTEX_WAIT, cur_state, &rel_ts, NULL, 0) != 0) { |
| 856 | if (errno == ETIMEDOUT) { |
| 857 | woken = false; |
| 858 | break; |
| 859 | } |
| 860 | if ((errno == EINTR) || (errno == EAGAIN)) { |
| 861 | if (state_ != cur_state) { |
| 862 | // We failed and a signal has come in. |
| 863 | woken = false; |
| 864 | break; |
| 865 | } |
| 866 | timespec now_abs_ts; |
| 867 | InitTimeSpec(self, true, CLOCK_REALTIME, 0, 0, &now_abs_ts); |
| 868 | if (ComputeRelativeTimeSpec(&rel_ts, end_abs_ts, now_abs_ts)) { |
| 869 | // futex failed and we timed out in the meantime. |
| 870 | woken = false; |
| 871 | break; |
| 872 | } |
| 873 | } else { |
| 874 | PLOG(FATAL) << "timed futex wait failed for " << name_; |
| 875 | } |
| 876 | } |
| 877 | guard_.ExclusiveLock(self); |
| 878 | num_waiters_--; |
| 879 | if (woken) { |
| 880 | // If we were woken we were requeued on the mutex, decrement the mutex's contender count. |
| 881 | android_atomic_dec(&guard_.num_contenders_); |
| 882 | num_awoken_--; |
| 883 | } |
| 884 | #else |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 885 | #ifdef HAVE_TIMEDWAIT_MONOTONIC |
| 886 | #define TIMEDWAIT pthread_cond_timedwait_monotonic |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 887 | int clock = CLOCK_MONOTONIC; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 888 | #else |
| 889 | #define TIMEDWAIT pthread_cond_timedwait |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 890 | int clock = CLOCK_REALTIME; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 891 | #endif |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 892 | guard_.recursion_count_ = 0; |
| 893 | timespec ts; |
| 894 | InitTimeSpec(self, true, clock, ms, ns, &ts); |
| 895 | int rc = TIMEDWAIT(&cond_, &guard_.mutex_, &ts); |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 896 | if (rc != 0 && rc != ETIMEDOUT) { |
| 897 | errno = rc; |
| 898 | PLOG(FATAL) << "TimedWait failed for " << name_; |
| 899 | } |
Ian Rogers | c604d73 | 2012-10-14 16:09:54 -0700 | [diff] [blame] | 900 | #endif |
| 901 | guard_.recursion_count_ = old_recursion_count; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 902 | } |
| 903 | |
Elliott Hughes | e62934d | 2012-04-09 11:24:29 -0700 | [diff] [blame] | 904 | } // namespace art |