+++ /dev/null
-/*
- * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
- * Copyright (C) 2009 Google Inc. All rights reserved.
- * Copyright (C) 2009 Torch Mobile, Inc. 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.
- */
-
-/*
- * There are numerous academic and practical works on how to implement pthread_cond_wait/pthread_cond_signal/pthread_cond_broadcast
- * functions on Win32. Here is one example: http://www.cs.wustl.edu/~schmidt/win32-cv-1.html which is widely credited as a 'starting point'
- * of modern attempts. There are several more or less proven implementations, one in Boost C++ library (http://www.boost.org) and another
- * in pthreads-win32 (http://sourceware.org/pthreads-win32/).
- *
- * The number of articles and discussions is the evidence of significant difficulties in implementing these primitives correctly.
- * The brief search of revisions, ChangeLog entries, discussions in comp.programming.threads and other places clearly documents
- * numerous pitfalls and performance problems the authors had to overcome to arrive to the suitable implementations.
- * Optimally, WebKit would use one of those supported/tested libraries directly. To roll out our own implementation is impractical,
- * if even for the lack of sufficient testing. However, a faithful reproduction of the code from one of the popular supported
- * libraries seems to be a good compromise.
- *
- * The early Boost implementation (http://www.boxbackup.org/trac/browser/box/nick/win/lib/win32/boost_1_32_0/libs/thread/src/condition.cpp?rev=30)
- * is identical to pthreads-win32 (http://sourceware.org/cgi-bin/cvsweb.cgi/pthreads/pthread_cond_wait.c?rev=1.10&content-type=text/x-cvsweb-markup&cvsroot=pthreads-win32).
- * Current Boost uses yet another (although seemingly equivalent) algorithm which came from their 'thread rewrite' effort.
- *
- * This file includes timedWait/signal/broadcast implementations translated to WebKit coding style from the latest algorithm by
- * Alexander Terekhov and Louis Thomas, as captured here: http://sourceware.org/cgi-bin/cvsweb.cgi/pthreads/pthread_cond_wait.c?rev=1.10&content-type=text/x-cvsweb-markup&cvsroot=pthreads-win32
- * It replaces the implementation of their previous algorithm, also documented in the same source above.
- * The naming and comments are left very close to original to enable easy cross-check.
- *
- * The corresponding Pthreads-win32 License is included below, and CONTRIBUTORS file which it refers to is added to
- * source directory (as CONTRIBUTORS.pthreads-win32).
- */
-
-/*
- * Pthreads-win32 - POSIX Threads Library for Win32
- * Copyright(C) 1998 John E. Bossom
- * Copyright(C) 1999,2005 Pthreads-win32 contributors
- *
- * Contact Email: rpj@callisto.canberra.edu.au
- *
- * The current list of contributors is contained
- * in the file CONTRIBUTORS included with the source
- * code distribution. The list can also be seen at the
- * following World Wide Web location:
- * http://sources.redhat.com/pthreads-win32/contributors.html
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library in the file COPYING.LIB;
- * if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
- */
-
-#include "config.h"
-#include "Threading.h"
-
-#include "MainThread.h"
-#include "ThreadFunctionInvocation.h"
-#include <windows.h>
-#include <wtf/CurrentTime.h>
-#include <wtf/HashMap.h>
-#include <wtf/MathExtras.h>
-#include <wtf/OwnPtr.h>
-#include <wtf/PassOwnPtr.h>
-#include <wtf/RandomNumberSeed.h>
-
-#if !USE(PTHREADS) && OS(WINDOWS)
-#include "ThreadSpecific.h"
-#endif
-
-#if !OS(WINCE)
-#include <process.h>
-#endif
-
-#if HAVE(ERRNO_H)
-#include <errno.h>
-#endif
-
-namespace WTF {
-
-// MS_VC_EXCEPTION, THREADNAME_INFO, and setThreadNameInternal all come from <http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx>.
-static const DWORD MS_VC_EXCEPTION = 0x406D1388;
-
-#pragma pack(push, 8)
-typedef struct tagTHREADNAME_INFO {
- DWORD dwType; // must be 0x1000
- LPCSTR szName; // pointer to name (in user addr space)
- DWORD dwThreadID; // thread ID (-1=caller thread)
- DWORD dwFlags; // reserved for future use, must be zero
-} THREADNAME_INFO;
-#pragma pack(pop)
-
-void initializeCurrentThreadInternal(const char* szThreadName)
-{
- THREADNAME_INFO info;
- info.dwType = 0x1000;
- info.szName = szThreadName;
- info.dwThreadID = GetCurrentThreadId();
- info.dwFlags = 0;
-
- __try {
- RaiseException(MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(ULONG_PTR), reinterpret_cast<ULONG_PTR*>(&info));
- } __except (EXCEPTION_CONTINUE_EXECUTION) {
- }
-}
-
-static Mutex* atomicallyInitializedStaticMutex;
-
-void lockAtomicallyInitializedStaticMutex()
-{
- ASSERT(atomicallyInitializedStaticMutex);
- atomicallyInitializedStaticMutex->lock();
-}
-
-void unlockAtomicallyInitializedStaticMutex()
-{
- atomicallyInitializedStaticMutex->unlock();
-}
-
-static Mutex& threadMapMutex()
-{
- static Mutex mutex;
- return mutex;
-}
-
-void initializeThreading()
-{
- if (atomicallyInitializedStaticMutex)
- return;
-
- atomicallyInitializedStaticMutex = new Mutex;
- threadMapMutex();
- initializeRandomNumberGenerator();
-}
-
-static HashMap<DWORD, HANDLE>& threadMap()
-{
- static HashMap<DWORD, HANDLE> map;
- return map;
-}
-
-static void storeThreadHandleByIdentifier(DWORD threadID, HANDLE threadHandle)
-{
- MutexLocker locker(threadMapMutex());
- ASSERT(!threadMap().contains(threadID));
- threadMap().add(threadID, threadHandle);
-}
-
-static HANDLE threadHandleForIdentifier(ThreadIdentifier id)
-{
- MutexLocker locker(threadMapMutex());
- return threadMap().get(id);
-}
-
-static void clearThreadHandleForIdentifier(ThreadIdentifier id)
-{
- MutexLocker locker(threadMapMutex());
- ASSERT(threadMap().contains(id));
- threadMap().remove(id);
-}
-
-static unsigned __stdcall wtfThreadEntryPoint(void* param)
-{
- OwnPtr<ThreadFunctionInvocation> invocation = adoptPtr(static_cast<ThreadFunctionInvocation*>(param));
- void* result = invocation->function(invocation->data);
-
-#if !USE(PTHREADS) && OS(WINDOWS)
- // Do the TLS cleanup.
- ThreadSpecificThreadExit();
-#endif
-
- return reinterpret_cast<unsigned>(result);
-}
-
-ThreadIdentifier createThreadInternal(ThreadFunction entryPoint, void* data, const char* threadName)
-{
- unsigned threadIdentifier = 0;
- ThreadIdentifier threadID = 0;
- OwnPtr<ThreadFunctionInvocation> invocation = adoptPtr(new ThreadFunctionInvocation(entryPoint, data));
-#if OS(WINCE)
- // This is safe on WINCE, since CRT is in the core and innately multithreaded.
- // On desktop Windows, need to use _beginthreadex (not available on WinCE) if using any CRT functions
- HANDLE threadHandle = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)wtfThreadEntryPoint, invocation.get(), 0, (LPDWORD)&threadIdentifier);
-#else
- HANDLE threadHandle = reinterpret_cast<HANDLE>(_beginthreadex(0, 0, wtfThreadEntryPoint, invocation.get(), 0, &threadIdentifier));
-#endif
- if (!threadHandle) {
-#if OS(WINCE)
- LOG_ERROR("Failed to create thread at entry point %p with data %p: %ld", entryPoint, data, ::GetLastError());
-#elif !HAVE(ERRNO_H)
- LOG_ERROR("Failed to create thread at entry point %p with data %p.", entryPoint, data);
-#else
- LOG_ERROR("Failed to create thread at entry point %p with data %p: %ld", entryPoint, data, errno);
-#endif
- return 0;
- }
-
- // The thread will take ownership of invocation.
- invocation.leakPtr();
-
- threadID = static_cast<ThreadIdentifier>(threadIdentifier);
- storeThreadHandleByIdentifier(threadIdentifier, threadHandle);
-
- return threadID;
-}
-
-int waitForThreadCompletion(ThreadIdentifier threadID, void** result)
-{
- ASSERT(threadID);
-
- HANDLE threadHandle = threadHandleForIdentifier(threadID);
- if (!threadHandle)
- LOG_ERROR("ThreadIdentifier %u did not correspond to an active thread when trying to quit", threadID);
-
- DWORD joinResult = WaitForSingleObject(threadHandle, INFINITE);
- if (joinResult == WAIT_FAILED)
- LOG_ERROR("ThreadIdentifier %u was found to be deadlocked trying to quit", threadID);
-
- CloseHandle(threadHandle);
- clearThreadHandleForIdentifier(threadID);
-
- return joinResult;
-}
-
-void detachThread(ThreadIdentifier threadID)
-{
- ASSERT(threadID);
-
- HANDLE threadHandle = threadHandleForIdentifier(threadID);
- if (threadHandle)
- CloseHandle(threadHandle);
- clearThreadHandleForIdentifier(threadID);
-}
-
-void yield()
-{
- ::Sleep(1);
-}
-
-ThreadIdentifier currentThread()
-{
- return static_cast<ThreadIdentifier>(GetCurrentThreadId());
-}
-
-Mutex::Mutex()
-{
- m_mutex.m_recursionCount = 0;
- InitializeCriticalSection(&m_mutex.m_internalMutex);
-}
-
-Mutex::~Mutex()
-{
- DeleteCriticalSection(&m_mutex.m_internalMutex);
-}
-
-void Mutex::lock()
-{
- EnterCriticalSection(&m_mutex.m_internalMutex);
- ++m_mutex.m_recursionCount;
-}
-
-bool Mutex::tryLock()
-{
- // This method is modeled after the behavior of pthread_mutex_trylock,
- // which will return an error if the lock is already owned by the
- // current thread. Since the primitive Win32 'TryEnterCriticalSection'
- // treats this as a successful case, it changes the behavior of several
- // tests in WebKit that check to see if the current thread already
- // owned this mutex (see e.g., IconDatabase::getOrCreateIconRecord)
- DWORD result = TryEnterCriticalSection(&m_mutex.m_internalMutex);
-
- if (result != 0) { // We got the lock
- // If this thread already had the lock, we must unlock and
- // return false so that we mimic the behavior of POSIX's
- // pthread_mutex_trylock:
- if (m_mutex.m_recursionCount > 0) {
- LeaveCriticalSection(&m_mutex.m_internalMutex);
- return false;
- }
-
- ++m_mutex.m_recursionCount;
- return true;
- }
-
- return false;
-}
-
-void Mutex::unlock()
-{
- --m_mutex.m_recursionCount;
- LeaveCriticalSection(&m_mutex.m_internalMutex);
-}
-
-bool PlatformCondition::timedWait(PlatformMutex& mutex, DWORD durationMilliseconds)
-{
- // Enter the wait state.
- DWORD res = WaitForSingleObject(m_blockLock, INFINITE);
- ASSERT(res == WAIT_OBJECT_0);
- ++m_waitersBlocked;
- res = ReleaseSemaphore(m_blockLock, 1, 0);
- ASSERT(res);
-
- --mutex.m_recursionCount;
- LeaveCriticalSection(&mutex.m_internalMutex);
-
- // Main wait - use timeout.
- bool timedOut = (WaitForSingleObject(m_blockQueue, durationMilliseconds) == WAIT_TIMEOUT);
-
- res = WaitForSingleObject(m_unblockLock, INFINITE);
- ASSERT(res == WAIT_OBJECT_0);
-
- int signalsLeft = m_waitersToUnblock;
-
- if (m_waitersToUnblock)
- --m_waitersToUnblock;
- else if (++m_waitersGone == (INT_MAX / 2)) { // timeout/canceled or spurious semaphore
- // timeout or spurious wakeup occured, normalize the m_waitersGone count
- // this may occur if many calls to wait with a timeout are made and
- // no call to notify_* is made
- res = WaitForSingleObject(m_blockLock, INFINITE);
- ASSERT(res == WAIT_OBJECT_0);
- m_waitersBlocked -= m_waitersGone;
- res = ReleaseSemaphore(m_blockLock, 1, 0);
- ASSERT(res);
- m_waitersGone = 0;
- }
-
- res = ReleaseMutex(m_unblockLock);
- ASSERT(res);
-
- if (signalsLeft == 1) {
- res = ReleaseSemaphore(m_blockLock, 1, 0); // Open the gate.
- ASSERT(res);
- }
-
- EnterCriticalSection (&mutex.m_internalMutex);
- ++mutex.m_recursionCount;
-
- return !timedOut;
-}
-
-void PlatformCondition::signal(bool unblockAll)
-{
- unsigned signalsToIssue = 0;
-
- DWORD res = WaitForSingleObject(m_unblockLock, INFINITE);
- ASSERT(res == WAIT_OBJECT_0);
-
- if (m_waitersToUnblock) { // the gate is already closed
- if (!m_waitersBlocked) { // no-op
- res = ReleaseMutex(m_unblockLock);
- ASSERT(res);
- return;
- }
-
- if (unblockAll) {
- signalsToIssue = m_waitersBlocked;
- m_waitersToUnblock += m_waitersBlocked;
- m_waitersBlocked = 0;
- } else {
- signalsToIssue = 1;
- ++m_waitersToUnblock;
- --m_waitersBlocked;
- }
- } else if (m_waitersBlocked > m_waitersGone) {
- res = WaitForSingleObject(m_blockLock, INFINITE); // Close the gate.
- ASSERT(res == WAIT_OBJECT_0);
- if (m_waitersGone != 0) {
- m_waitersBlocked -= m_waitersGone;
- m_waitersGone = 0;
- }
- if (unblockAll) {
- signalsToIssue = m_waitersBlocked;
- m_waitersToUnblock = m_waitersBlocked;
- m_waitersBlocked = 0;
- } else {
- signalsToIssue = 1;
- m_waitersToUnblock = 1;
- --m_waitersBlocked;
- }
- } else { // No-op.
- res = ReleaseMutex(m_unblockLock);
- ASSERT(res);
- return;
- }
-
- res = ReleaseMutex(m_unblockLock);
- ASSERT(res);
-
- if (signalsToIssue) {
- res = ReleaseSemaphore(m_blockQueue, signalsToIssue, 0);
- ASSERT(res);
- }
-}
-
-static const long MaxSemaphoreCount = static_cast<long>(~0UL >> 1);
-
-ThreadCondition::ThreadCondition()
-{
- m_condition.m_waitersGone = 0;
- m_condition.m_waitersBlocked = 0;
- m_condition.m_waitersToUnblock = 0;
- m_condition.m_blockLock = CreateSemaphore(0, 1, 1, 0);
- m_condition.m_blockQueue = CreateSemaphore(0, 0, MaxSemaphoreCount, 0);
- m_condition.m_unblockLock = CreateMutex(0, 0, 0);
-
- if (!m_condition.m_blockLock || !m_condition.m_blockQueue || !m_condition.m_unblockLock) {
- if (m_condition.m_blockLock)
- CloseHandle(m_condition.m_blockLock);
- if (m_condition.m_blockQueue)
- CloseHandle(m_condition.m_blockQueue);
- if (m_condition.m_unblockLock)
- CloseHandle(m_condition.m_unblockLock);
- }
-}
-
-ThreadCondition::~ThreadCondition()
-{
- CloseHandle(m_condition.m_blockLock);
- CloseHandle(m_condition.m_blockQueue);
- CloseHandle(m_condition.m_unblockLock);
-}
-
-void ThreadCondition::wait(Mutex& mutex)
-{
- m_condition.timedWait(mutex.impl(), INFINITE);
-}
-
-bool ThreadCondition::timedWait(Mutex& mutex, double absoluteTime)
-{
- DWORD interval = absoluteTimeToWaitTimeoutInterval(absoluteTime);
-
- if (!interval) {
- // Consider the wait to have timed out, even if our condition has already been signaled, to
- // match the pthreads implementation.
- return false;
- }
-
- return m_condition.timedWait(mutex.impl(), interval);
-}
-
-void ThreadCondition::signal()
-{
- m_condition.signal(false); // Unblock only 1 thread.
-}
-
-void ThreadCondition::broadcast()
-{
- m_condition.signal(true); // Unblock all threads.
-}
-
-DWORD absoluteTimeToWaitTimeoutInterval(double absoluteTime)
-{
- double currentTime = WTF::currentTime();
-
- // Time is in the past - return immediately.
- if (absoluteTime < currentTime)
- return 0;
-
- // Time is too far in the future (and would overflow unsigned long) - wait forever.
- if (absoluteTime - currentTime > static_cast<double>(INT_MAX) / 1000.0)
- return INFINITE;
-
- return static_cast<DWORD>((absoluteTime - currentTime) * 1000.0);
-}
-
-} // namespace WTF
projects / apple / javascriptcore.git / blobdiff