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| 1 /* | |
| 2 * Copyright (C) 2007, 2009 Apple Inc. All rights reserved. | |
| 3 * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com) | |
| 4 * Copyright (C) 2011 Research In Motion Limited. All rights reserved. | |
| 5 * | |
| 6 * Redistribution and use in source and binary forms, with or without | |
| 7 * modification, are permitted provided that the following conditions | |
| 8 * are met: | |
| 9 * | |
| 10 * 1. Redistributions of source code must retain the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer. | |
| 12 * 2. Redistributions in binary form must reproduce the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer in the | |
| 14 * documentation and/or other materials provided with the distribution. | |
| 15 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
| 16 * its contributors may be used to endorse or promote products derived | |
| 17 * from this software without specific prior written permission. | |
| 18 * | |
| 19 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
| 20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 22 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
| 23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
| 26 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #include "config.h" | |
| 32 #include "Threading.h" | |
| 33 | |
| 34 #if USE(PTHREADS) | |
| 35 | |
| 36 #include "DateMath.h" | |
| 37 #include "dtoa.h" | |
| 38 #include "dtoa/cached-powers.h" | |
| 39 #include "HashMap.h" | |
| 40 #include "RandomNumberSeed.h" | |
| 41 #include "StackStats.h" | |
| 42 #include "StdLibExtras.h" | |
| 43 #include "ThreadFunctionInvocation.h" | |
| 44 #include "ThreadIdentifierDataPthreads.h" | |
| 45 #include "ThreadSpecific.h" | |
| 46 #include "UnusedParam.h" | |
| 47 #include <wtf/OwnPtr.h> | |
| 48 #include <wtf/PassOwnPtr.h> | |
| 49 #include <wtf/WTFThreadData.h> | |
| 50 #include <errno.h> | |
| 51 | |
| 52 #if !COMPILER(MSVC) | |
| 53 #include <limits.h> | |
| 54 #include <sched.h> | |
| 55 #include <sys/time.h> | |
| 56 #endif | |
| 57 | |
| 58 #if OS(MAC_OS_X) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1060 | |
| 59 #include <objc/objc-auto.h> | |
| 60 #endif | |
| 61 | |
| 62 namespace WTF { | |
| 63 | |
| 64 class PthreadState { | |
| 65 WTF_MAKE_FAST_ALLOCATED; | |
| 66 public: | |
| 67 enum JoinableState { | |
| 68 Joinable, // The default thread state. The thread can be joined on. | |
| 69 | |
| 70 Joined, // Somebody waited on this thread to exit and this thread finall
y exited. This state is here because there can be a | |
| 71 // period of time between when the thread exits (which causes pt
hread_join to return and the remainder of waitOnThreadCompletion to run) | |
| 72 // and when threadDidExit is called. We need threadDidExit to ta
ke charge and delete the thread data since there's | |
| 73 // nobody else to pick up the slack in this case (since waitOnTh
readCompletion has already returned). | |
| 74 | |
| 75 Detached // The thread has been detached and can no longer be joined on.
At this point, the thread must take care of cleaning up after itself. | |
| 76 }; | |
| 77 | |
| 78 // Currently all threads created by WTF start out as joinable. | |
| 79 PthreadState(pthread_t handle) | |
| 80 : m_joinableState(Joinable) | |
| 81 , m_didExit(false) | |
| 82 , m_pthreadHandle(handle) | |
| 83 { | |
| 84 } | |
| 85 | |
| 86 JoinableState joinableState() { return m_joinableState; } | |
| 87 pthread_t pthreadHandle() { return m_pthreadHandle; } | |
| 88 void didBecomeDetached() { m_joinableState = Detached; } | |
| 89 void didExit() { m_didExit = true; } | |
| 90 void didJoin() { m_joinableState = Joined; } | |
| 91 bool hasExited() { return m_didExit; } | |
| 92 | |
| 93 private: | |
| 94 JoinableState m_joinableState; | |
| 95 bool m_didExit; | |
| 96 pthread_t m_pthreadHandle; | |
| 97 }; | |
| 98 | |
| 99 typedef HashMap<ThreadIdentifier, OwnPtr<PthreadState> > ThreadMap; | |
| 100 | |
| 101 static Mutex* atomicallyInitializedStaticMutex; | |
| 102 | |
| 103 void unsafeThreadWasDetached(ThreadIdentifier); | |
| 104 void threadDidExit(ThreadIdentifier); | |
| 105 void threadWasJoined(ThreadIdentifier); | |
| 106 | |
| 107 static Mutex& threadMapMutex() | |
| 108 { | |
| 109 DEFINE_STATIC_LOCAL(Mutex, mutex, ()); | |
| 110 return mutex; | |
| 111 } | |
| 112 | |
| 113 #if OS(QNX) && CPU(ARM_THUMB2) | |
| 114 static void enableIEEE754Denormal() | |
| 115 { | |
| 116 // Clear the ARM_VFP_FPSCR_FZ flag in FPSCR. | |
| 117 unsigned fpscr; | |
| 118 asm volatile("vmrs %0, fpscr" : "=r"(fpscr)); | |
| 119 fpscr &= ~0x01000000u; | |
| 120 asm volatile("vmsr fpscr, %0" : : "r"(fpscr)); | |
| 121 } | |
| 122 #endif | |
| 123 | |
| 124 void initializeThreading() | |
| 125 { | |
| 126 if (atomicallyInitializedStaticMutex) | |
| 127 return; | |
| 128 | |
| 129 #if OS(QNX) && CPU(ARM_THUMB2) | |
| 130 enableIEEE754Denormal(); | |
| 131 #endif | |
| 132 | |
| 133 WTF::double_conversion::initialize(); | |
| 134 // StringImpl::empty() does not construct its static string in a threadsafe
fashion, | |
| 135 // so ensure it has been initialized from here. | |
| 136 StringImpl::empty(); | |
| 137 atomicallyInitializedStaticMutex = new Mutex; | |
| 138 threadMapMutex(); | |
| 139 initializeRandomNumberGenerator(); | |
| 140 ThreadIdentifierData::initializeOnce(); | |
| 141 StackStats::initialize(); | |
| 142 wtfThreadData(); | |
| 143 s_dtoaP5Mutex = new Mutex; | |
| 144 initializeDates(); | |
| 145 } | |
| 146 | |
| 147 void lockAtomicallyInitializedStaticMutex() | |
| 148 { | |
| 149 ASSERT(atomicallyInitializedStaticMutex); | |
| 150 atomicallyInitializedStaticMutex->lock(); | |
| 151 } | |
| 152 | |
| 153 void unlockAtomicallyInitializedStaticMutex() | |
| 154 { | |
| 155 atomicallyInitializedStaticMutex->unlock(); | |
| 156 } | |
| 157 | |
| 158 static ThreadMap& threadMap() | |
| 159 { | |
| 160 DEFINE_STATIC_LOCAL(ThreadMap, map, ()); | |
| 161 return map; | |
| 162 } | |
| 163 | |
| 164 static ThreadIdentifier identifierByPthreadHandle(const pthread_t& pthreadHandle
) | |
| 165 { | |
| 166 MutexLocker locker(threadMapMutex()); | |
| 167 | |
| 168 ThreadMap::iterator i = threadMap().begin(); | |
| 169 for (; i != threadMap().end(); ++i) { | |
| 170 if (pthread_equal(i->value->pthreadHandle(), pthreadHandle) && !i->value
->hasExited()) | |
| 171 return i->key; | |
| 172 } | |
| 173 | |
| 174 return 0; | |
| 175 } | |
| 176 | |
| 177 static ThreadIdentifier establishIdentifierForPthreadHandle(const pthread_t& pth
readHandle) | |
| 178 { | |
| 179 ASSERT(!identifierByPthreadHandle(pthreadHandle)); | |
| 180 MutexLocker locker(threadMapMutex()); | |
| 181 static ThreadIdentifier identifierCount = 1; | |
| 182 threadMap().add(identifierCount, adoptPtr(new PthreadState(pthreadHandle))); | |
| 183 return identifierCount++; | |
| 184 } | |
| 185 | |
| 186 static pthread_t pthreadHandleForIdentifierWithLockAlreadyHeld(ThreadIdentifier
id) | |
| 187 { | |
| 188 return threadMap().get(id)->pthreadHandle(); | |
| 189 } | |
| 190 | |
| 191 static void* wtfThreadEntryPoint(void* param) | |
| 192 { | |
| 193 // Balanced by .leakPtr() in createThreadInternal. | |
| 194 OwnPtr<ThreadFunctionInvocation> invocation = adoptPtr(static_cast<ThreadFun
ctionInvocation*>(param)); | |
| 195 invocation->function(invocation->data); | |
| 196 return 0; | |
| 197 } | |
| 198 | |
| 199 ThreadIdentifier createThreadInternal(ThreadFunction entryPoint, void* data, con
st char*) | |
| 200 { | |
| 201 OwnPtr<ThreadFunctionInvocation> invocation = adoptPtr(new ThreadFunctionInv
ocation(entryPoint, data)); | |
| 202 pthread_t threadHandle; | |
| 203 if (pthread_create(&threadHandle, 0, wtfThreadEntryPoint, invocation.get()))
{ | |
| 204 LOG_ERROR("Failed to create pthread at entry point %p with data %p", wtf
ThreadEntryPoint, invocation.get()); | |
| 205 return 0; | |
| 206 } | |
| 207 | |
| 208 // Balanced by adoptPtr() in wtfThreadEntryPoint. | |
| 209 ThreadFunctionInvocation* leakedInvocation = invocation.leakPtr(); | |
| 210 UNUSED_PARAM(leakedInvocation); | |
| 211 | |
| 212 return establishIdentifierForPthreadHandle(threadHandle); | |
| 213 } | |
| 214 | |
| 215 void initializeCurrentThreadInternal(const char* threadName) | |
| 216 { | |
| 217 #if HAVE(PTHREAD_SETNAME_NP) | |
| 218 pthread_setname_np(threadName); | |
| 219 #elif OS(QNX) | |
| 220 pthread_setname_np(pthread_self(), threadName); | |
| 221 #else | |
| 222 UNUSED_PARAM(threadName); | |
| 223 #endif | |
| 224 | |
| 225 #if OS(MAC_OS_X) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1060 | |
| 226 // All threads that potentially use APIs above the BSD layer must be registe
red with the Objective-C | |
| 227 // garbage collector in case API implementations use garbage-collected memor
y. | |
| 228 objc_registerThreadWithCollector(); | |
| 229 #endif | |
| 230 | |
| 231 #if OS(QNX) && CPU(ARM_THUMB2) | |
| 232 enableIEEE754Denormal(); | |
| 233 #endif | |
| 234 | |
| 235 ThreadIdentifier id = identifierByPthreadHandle(pthread_self()); | |
| 236 ASSERT(id); | |
| 237 ThreadIdentifierData::initialize(id); | |
| 238 } | |
| 239 | |
| 240 int waitForThreadCompletion(ThreadIdentifier threadID) | |
| 241 { | |
| 242 pthread_t pthreadHandle; | |
| 243 ASSERT(threadID); | |
| 244 | |
| 245 { | |
| 246 // We don't want to lock across the call to join, since that can block o
ur thread and cause deadlock. | |
| 247 MutexLocker locker(threadMapMutex()); | |
| 248 pthreadHandle = pthreadHandleForIdentifierWithLockAlreadyHeld(threadID); | |
| 249 ASSERT(pthreadHandle); | |
| 250 } | |
| 251 | |
| 252 int joinResult = pthread_join(pthreadHandle, 0); | |
| 253 | |
| 254 if (joinResult == EDEADLK) | |
| 255 LOG_ERROR("ThreadIdentifier %u was found to be deadlocked trying to quit
", threadID); | |
| 256 else if (joinResult) | |
| 257 LOG_ERROR("ThreadIdentifier %u was unable to be joined.\n", threadID); | |
| 258 | |
| 259 MutexLocker locker(threadMapMutex()); | |
| 260 PthreadState* state = threadMap().get(threadID); | |
| 261 ASSERT(state); | |
| 262 ASSERT(state->joinableState() == PthreadState::Joinable); | |
| 263 | |
| 264 // The thread has already exited, so clean up after it. | |
| 265 if (state->hasExited()) | |
| 266 threadMap().remove(threadID); | |
| 267 // The thread hasn't exited yet, so don't clean anything up. Just signal tha
t we've already joined on it so that it will clean up after itself. | |
| 268 else | |
| 269 state->didJoin(); | |
| 270 | |
| 271 return joinResult; | |
| 272 } | |
| 273 | |
| 274 void detachThread(ThreadIdentifier threadID) | |
| 275 { | |
| 276 ASSERT(threadID); | |
| 277 | |
| 278 MutexLocker locker(threadMapMutex()); | |
| 279 pthread_t pthreadHandle = pthreadHandleForIdentifierWithLockAlreadyHeld(thre
adID); | |
| 280 ASSERT(pthreadHandle); | |
| 281 | |
| 282 int detachResult = pthread_detach(pthreadHandle); | |
| 283 if (detachResult) | |
| 284 LOG_ERROR("ThreadIdentifier %u was unable to be detached\n", threadID); | |
| 285 | |
| 286 PthreadState* state = threadMap().get(threadID); | |
| 287 ASSERT(state); | |
| 288 if (state->hasExited()) | |
| 289 threadMap().remove(threadID); | |
| 290 else | |
| 291 threadMap().get(threadID)->didBecomeDetached(); | |
| 292 } | |
| 293 | |
| 294 void threadDidExit(ThreadIdentifier threadID) | |
| 295 { | |
| 296 MutexLocker locker(threadMapMutex()); | |
| 297 PthreadState* state = threadMap().get(threadID); | |
| 298 ASSERT(state); | |
| 299 | |
| 300 state->didExit(); | |
| 301 | |
| 302 if (state->joinableState() != PthreadState::Joinable) | |
| 303 threadMap().remove(threadID); | |
| 304 } | |
| 305 | |
| 306 void yield() | |
| 307 { | |
| 308 sched_yield(); | |
| 309 } | |
| 310 | |
| 311 ThreadIdentifier currentThread() | |
| 312 { | |
| 313 ThreadIdentifier id = ThreadIdentifierData::identifier(); | |
| 314 if (id) | |
| 315 return id; | |
| 316 | |
| 317 // Not a WTF-created thread, ThreadIdentifier is not established yet. | |
| 318 id = establishIdentifierForPthreadHandle(pthread_self()); | |
| 319 ThreadIdentifierData::initialize(id); | |
| 320 return id; | |
| 321 } | |
| 322 | |
| 323 Mutex::Mutex() | |
| 324 { | |
| 325 pthread_mutexattr_t attr; | |
| 326 pthread_mutexattr_init(&attr); | |
| 327 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL); | |
| 328 | |
| 329 int result = pthread_mutex_init(&m_mutex, &attr); | |
| 330 ASSERT_UNUSED(result, !result); | |
| 331 | |
| 332 pthread_mutexattr_destroy(&attr); | |
| 333 } | |
| 334 | |
| 335 Mutex::~Mutex() | |
| 336 { | |
| 337 int result = pthread_mutex_destroy(&m_mutex); | |
| 338 ASSERT_UNUSED(result, !result); | |
| 339 } | |
| 340 | |
| 341 void Mutex::lock() | |
| 342 { | |
| 343 int result = pthread_mutex_lock(&m_mutex); | |
| 344 ASSERT_UNUSED(result, !result); | |
| 345 } | |
| 346 | |
| 347 bool Mutex::tryLock() | |
| 348 { | |
| 349 int result = pthread_mutex_trylock(&m_mutex); | |
| 350 | |
| 351 if (result == 0) | |
| 352 return true; | |
| 353 if (result == EBUSY) | |
| 354 return false; | |
| 355 | |
| 356 ASSERT_NOT_REACHED(); | |
| 357 return false; | |
| 358 } | |
| 359 | |
| 360 void Mutex::unlock() | |
| 361 { | |
| 362 int result = pthread_mutex_unlock(&m_mutex); | |
| 363 ASSERT_UNUSED(result, !result); | |
| 364 } | |
| 365 | |
| 366 ThreadCondition::ThreadCondition() | |
| 367 { | |
| 368 pthread_cond_init(&m_condition, NULL); | |
| 369 } | |
| 370 | |
| 371 ThreadCondition::~ThreadCondition() | |
| 372 { | |
| 373 pthread_cond_destroy(&m_condition); | |
| 374 } | |
| 375 | |
| 376 void ThreadCondition::wait(Mutex& mutex) | |
| 377 { | |
| 378 int result = pthread_cond_wait(&m_condition, &mutex.impl()); | |
| 379 ASSERT_UNUSED(result, !result); | |
| 380 } | |
| 381 | |
| 382 bool ThreadCondition::timedWait(Mutex& mutex, double absoluteTime) | |
| 383 { | |
| 384 if (absoluteTime < currentTime()) | |
| 385 return false; | |
| 386 | |
| 387 if (absoluteTime > INT_MAX) { | |
| 388 wait(mutex); | |
| 389 return true; | |
| 390 } | |
| 391 | |
| 392 int timeSeconds = static_cast<int>(absoluteTime); | |
| 393 int timeNanoseconds = static_cast<int>((absoluteTime - timeSeconds) * 1E9); | |
| 394 | |
| 395 timespec targetTime; | |
| 396 targetTime.tv_sec = timeSeconds; | |
| 397 targetTime.tv_nsec = timeNanoseconds; | |
| 398 | |
| 399 return pthread_cond_timedwait(&m_condition, &mutex.impl(), &targetTime) == 0
; | |
| 400 } | |
| 401 | |
| 402 void ThreadCondition::signal() | |
| 403 { | |
| 404 int result = pthread_cond_signal(&m_condition); | |
| 405 ASSERT_UNUSED(result, !result); | |
| 406 } | |
| 407 | |
| 408 void ThreadCondition::broadcast() | |
| 409 { | |
| 410 int result = pthread_cond_broadcast(&m_condition); | |
| 411 ASSERT_UNUSED(result, !result); | |
| 412 } | |
| 413 | |
| 414 } // namespace WTF | |
| 415 | |
| 416 #endif // USE(PTHREADS) | |
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Chromium Code Reviews
Issue 14238015:
Move Source/WTF/wtf to Source/wtf (Closed)
Base URL: svn://svn.chromium.org/blink/trunk