Move files in wtf/ to platform/wtf/ (Part 12).

third_party/WebKit/Source/wtf/ThreadingPthreads.cpp

-/*
- * Copyright (C) 2007, 2009 Apple Inc. All rights reserved.
- * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
- * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
- *     its contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "wtf/Threading.h"
-
-#if OS(POSIX)
-
-#include "wtf/CurrentTime.h"
-#include "wtf/DateMath.h"
-#include "wtf/HashMap.h"
-#include "wtf/StdLibExtras.h"
-#include "wtf/ThreadSpecific.h"
-#include "wtf/ThreadingPrimitives.h"
-#include "wtf/WTFThreadData.h"
-#include "wtf/dtoa/double-conversion.h"
-#include <errno.h>
-#include <limits.h>
-#include <sched.h>
-#include <sys/time.h>
-
-#if OS(MACOSX)
-#include <objc/objc-auto.h>
-#endif
-
-#if OS(LINUX)
-#include <sys/syscall.h>
-#endif
-
-#if OS(LINUX) || OS(ANDROID)
-#include <unistd.h>
-#endif
-
-namespace WTF {
-
-namespace internal {
-
-ThreadIdentifier currentThreadSyscall() {
-#if OS(MACOSX)
-  return pthread_mach_thread_np(pthread_self());
-#elif OS(LINUX)
-  return syscall(__NR_gettid);
-#elif OS(ANDROID)
-  return gettid();
-#else
-  return reinterpret_cast<uintptr_t>(pthread_self());
-#endif
-}
-
-}  // namespace internal
-
-void initializeThreading() {
-  // This should only be called once.
-  WTFThreadData::initialize();
-
-  initializeDates();
-  // Force initialization of static DoubleToStringConverter converter variable
-  // inside EcmaScriptConverter function while we are in single thread mode.
-  double_conversion::DoubleToStringConverter::EcmaScriptConverter();
-}
-
-namespace {
-ThreadSpecificKey s_currentThreadKey;
-bool s_currentThreadKeyInitialized = false;
-}  // namespace
-
-void initializeCurrentThread() {
-  DCHECK(!s_currentThreadKeyInitialized);
-  threadSpecificKeyCreate(&s_currentThreadKey, [](void*) {});
-  s_currentThreadKeyInitialized = true;
-}
-
-ThreadIdentifier currentThread() {
-  // This doesn't use WTF::ThreadSpecific (e.g. WTFThreadData) because
-  // ThreadSpecific now depends on currentThread. It is necessary to avoid this
-  // or a similar loop:
-  //
-  // currentThread
-  // -> wtfThreadData
-  // -> ThreadSpecific::operator*
-  // -> isMainThread
-  // -> currentThread
-  static_assert(sizeof(ThreadIdentifier) <= sizeof(void*),
-                "ThreadIdentifier must fit in a void*.");
-  DCHECK(s_currentThreadKeyInitialized);
-  void* value = threadSpecificGet(s_currentThreadKey);
-  if (UNLIKELY(!value)) {
-    value = reinterpret_cast<void*>(
-        static_cast<intptr_t>(internal::currentThreadSyscall()));
-    DCHECK(value);
-    threadSpecificSet(s_currentThreadKey, value);
-  }
-  return reinterpret_cast<intptr_t>(threadSpecificGet(s_currentThreadKey));
-}
-
-MutexBase::MutexBase(bool recursive) {
-  pthread_mutexattr_t attr;
-  pthread_mutexattr_init(&attr);
-  pthread_mutexattr_settype(
-      &attr, recursive ? PTHREAD_MUTEX_RECURSIVE : PTHREAD_MUTEX_NORMAL);
-
-  int result = pthread_mutex_init(&m_mutex.m_internalMutex, &attr);
-  DCHECK_EQ(result, 0);
-#if DCHECK_IS_ON()
-  m_mutex.m_recursionCount = 0;
-#endif
-
-  pthread_mutexattr_destroy(&attr);
-}
-
-MutexBase::~MutexBase() {
-  int result = pthread_mutex_destroy(&m_mutex.m_internalMutex);
-  DCHECK_EQ(result, 0);
-}
-
-void MutexBase::lock() {
-  int result = pthread_mutex_lock(&m_mutex.m_internalMutex);
-  DCHECK_EQ(result, 0);
-#if DCHECK_IS_ON()
-  ++m_mutex.m_recursionCount;
-#endif
-}
-
-void MutexBase::unlock() {
-#if DCHECK_IS_ON()
-  DCHECK(m_mutex.m_recursionCount);
-  --m_mutex.m_recursionCount;
-#endif
-  int result = pthread_mutex_unlock(&m_mutex.m_internalMutex);
-  DCHECK_EQ(result, 0);
-}
-
-// There is a separate tryLock implementation for the Mutex and the
-// RecursiveMutex since on Windows we need to manually check if tryLock should
-// succeed or not for the non-recursive mutex. On Linux the two implementations
-// are equal except we can assert the recursion count is always zero for the
-// non-recursive mutex.
-bool Mutex::tryLock() {
-  int result = pthread_mutex_trylock(&m_mutex.m_internalMutex);
-  if (result == 0) {
-#if DCHECK_IS_ON()
-    // The Mutex class is not recursive, so the recursionCount should be
-    // zero after getting the lock.
-    DCHECK(!m_mutex.m_recursionCount);
-    ++m_mutex.m_recursionCount;
-#endif
-    return true;
-  }
-  if (result == EBUSY)
-    return false;
-
-  NOTREACHED();
-  return false;
-}
-
-bool RecursiveMutex::tryLock() {
-  int result = pthread_mutex_trylock(&m_mutex.m_internalMutex);
-  if (result == 0) {
-#if DCHECK_IS_ON()
-    ++m_mutex.m_recursionCount;
-#endif
-    return true;
-  }
-  if (result == EBUSY)
-    return false;
-
-  NOTREACHED();
-  return false;
-}
-
-ThreadCondition::ThreadCondition() {
-  pthread_cond_init(&m_condition, nullptr);
-}
-
-ThreadCondition::~ThreadCondition() {
-  pthread_cond_destroy(&m_condition);
-}
-
-void ThreadCondition::wait(MutexBase& mutex) {
-  PlatformMutex& platformMutex = mutex.impl();
-  int result = pthread_cond_wait(&m_condition, &platformMutex.m_internalMutex);
-  DCHECK_EQ(result, 0);
-#if DCHECK_IS_ON()
-  ++platformMutex.m_recursionCount;
-#endif
-}
-
-bool ThreadCondition::timedWait(MutexBase& mutex, double absoluteTime) {
-  if (absoluteTime < currentTime())
-    return false;
-
-  if (absoluteTime > INT_MAX) {
-    wait(mutex);
-    return true;
-  }
-
-  int timeSeconds = static_cast<int>(absoluteTime);
-  int timeNanoseconds = static_cast<int>((absoluteTime - timeSeconds) * 1E9);
-
-  timespec targetTime;
-  targetTime.tv_sec = timeSeconds;
-  targetTime.tv_nsec = timeNanoseconds;
-
-  PlatformMutex& platformMutex = mutex.impl();
-  int result = pthread_cond_timedwait(
-      &m_condition, &platformMutex.m_internalMutex, &targetTime);
-#if DCHECK_IS_ON()
-  ++platformMutex.m_recursionCount;
-#endif
-  return result == 0;
-}
-
-void ThreadCondition::signal() {
-  int result = pthread_cond_signal(&m_condition);
-  DCHECK_EQ(result, 0);
-}
-
-void ThreadCondition::broadcast() {
-  int result = pthread_cond_broadcast(&m_condition);
-  DCHECK_EQ(result, 0);
-}
-
-#if DCHECK_IS_ON()
-static bool s_threadCreated = false;
-
-bool isBeforeThreadCreated() {
-  return !s_threadCreated;
-}
-
-void willCreateThread() {
-  s_threadCreated = true;
-}
-#endif
-
-}  // namespace WTF
-
-#endif  // OS(POSIX)