X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/b5422865f473faf3977f31b96a635c4c8c4ede09..9dae56ea45a0f5f8136a5c93d6f3a7f99399ca73:/wtf/ThreadingPthreads.cpp?ds=sidebyside

diff --git a/wtf/ThreadingPthreads.cpp b/wtf/ThreadingPthreads.cpp
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+++ b/wtf/ThreadingPthreads.cpp
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+/*
+ * Copyright (C) 2007 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
+ *
+ * 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 "config.h"
+#include "Threading.h"
+
+#include "StdLibExtras.h"
+
+#if USE(PTHREADS)
+
+#include "CurrentTime.h"
+#include "HashMap.h"
+#include "MainThread.h"
+#include "RandomNumberSeed.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <sys/time.h>
+
+namespace WTF {
+
+typedef HashMap<ThreadIdentifier, pthread_t> ThreadMap;
+
+static Mutex* atomicallyInitializedStaticMutex;
+
+static ThreadIdentifier mainThreadIdentifier; // The thread that was the first to call initializeThreading(), which must be the main thread.
+
+static Mutex& threadMapMutex()
+{
+    DEFINE_STATIC_LOCAL(Mutex, mutex, ());
+    return mutex;
+}
+
+void initializeThreading()
+{
+    if (!atomicallyInitializedStaticMutex) {
+        atomicallyInitializedStaticMutex = new Mutex;
+        threadMapMutex();
+        initializeRandomNumberGenerator();
+        mainThreadIdentifier = currentThread();
+        initializeMainNSThread();
+        initializeMainThread();
+    }
+}
+
+void lockAtomicallyInitializedStaticMutex()
+{
+    ASSERT(atomicallyInitializedStaticMutex);
+    atomicallyInitializedStaticMutex->lock();
+}
+
+void unlockAtomicallyInitializedStaticMutex()
+{
+    atomicallyInitializedStaticMutex->unlock();
+}
+
+static ThreadMap& threadMap()
+{
+    DEFINE_STATIC_LOCAL(ThreadMap, map, ());
+    return map;
+}
+
+static ThreadIdentifier identifierByPthreadHandle(const pthread_t& pthreadHandle)
+{
+    MutexLocker locker(threadMapMutex());
+
+    ThreadMap::iterator i = threadMap().begin();
+    for (; i != threadMap().end(); ++i) {
+        if (pthread_equal(i->second, pthreadHandle))
+            return i->first;
+    }
+
+    return 0;
+}
+
+static ThreadIdentifier establishIdentifierForPthreadHandle(pthread_t& pthreadHandle)
+{
+    ASSERT(!identifierByPthreadHandle(pthreadHandle));
+
+    MutexLocker locker(threadMapMutex());
+
+    static ThreadIdentifier identifierCount = 1;
+
+    threadMap().add(identifierCount, pthreadHandle);
+    
+    return identifierCount++;
+}
+
+static pthread_t pthreadHandleForIdentifier(ThreadIdentifier id)
+{
+    MutexLocker locker(threadMapMutex());
+    
+    return threadMap().get(id);
+}
+
+static void clearPthreadHandleForIdentifier(ThreadIdentifier id)
+{
+    MutexLocker locker(threadMapMutex());
+
+    ASSERT(threadMap().contains(id));
+    
+    threadMap().remove(id);
+}
+
+ThreadIdentifier createThreadInternal(ThreadFunction entryPoint, void* data, const char*)
+{
+    pthread_t threadHandle;
+    if (pthread_create(&threadHandle, NULL, entryPoint, data)) {
+        LOG_ERROR("Failed to create pthread at entry point %p with data %p", entryPoint, data);
+        return 0;
+    }
+
+    return establishIdentifierForPthreadHandle(threadHandle);
+}
+
+int waitForThreadCompletion(ThreadIdentifier threadID, void** result)
+{
+    ASSERT(threadID);
+    
+    pthread_t pthreadHandle = pthreadHandleForIdentifier(threadID);
+ 
+    int joinResult = pthread_join(pthreadHandle, result);
+    if (joinResult == EDEADLK)
+        LOG_ERROR("ThreadIdentifier %u was found to be deadlocked trying to quit", threadID);
+        
+    clearPthreadHandleForIdentifier(threadID);
+    return joinResult;
+}
+
+void detachThread(ThreadIdentifier threadID)
+{
+    ASSERT(threadID);
+    
+    pthread_t pthreadHandle = pthreadHandleForIdentifier(threadID);
+    
+    pthread_detach(pthreadHandle);
+    
+    clearPthreadHandleForIdentifier(threadID);
+}
+
+ThreadIdentifier currentThread()
+{
+    pthread_t currentThread = pthread_self();
+    if (ThreadIdentifier id = identifierByPthreadHandle(currentThread))
+        return id;
+    return establishIdentifierForPthreadHandle(currentThread);
+}
+
+bool isMainThread()
+{
+    return currentThread() == mainThreadIdentifier;
+}
+
+Mutex::Mutex()
+{
+    pthread_mutex_init(&m_mutex, NULL);
+}
+
+Mutex::~Mutex()
+{
+    pthread_mutex_destroy(&m_mutex);
+}
+
+void Mutex::lock()
+{
+    if (pthread_mutex_lock(&m_mutex) != 0)
+        ASSERT(false);
+}
+    
+bool Mutex::tryLock()
+{
+    int result = pthread_mutex_trylock(&m_mutex);
+    
+    if (result == 0)
+        return true;
+    else if (result == EBUSY)
+        return false;
+
+    ASSERT(false);
+    return false;
+}
+
+void Mutex::unlock()
+{
+    if (pthread_mutex_unlock(&m_mutex) != 0)
+        ASSERT(false);
+}
+
+ThreadCondition::ThreadCondition()
+{ 
+    pthread_cond_init(&m_condition, NULL);
+}
+
+ThreadCondition::~ThreadCondition()
+{
+    pthread_cond_destroy(&m_condition);
+}
+    
+void ThreadCondition::wait(Mutex& mutex)
+{
+    if (pthread_cond_wait(&m_condition, &mutex.impl()) != 0)
+        ASSERT(false);
+}
+
+bool ThreadCondition::timedWait(Mutex& 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;
+
+    return pthread_cond_timedwait(&m_condition, &mutex.impl(), &targetTime) == 0;
+}
+
+void ThreadCondition::signal()
+{
+    if (pthread_cond_signal(&m_condition) != 0)
+        ASSERT(false);
+}
+
+void ThreadCondition::broadcast()
+{
+    if (pthread_cond_broadcast(&m_condition) != 0)
+        ASSERT(false);
+}
+    
+} // namespace WTF
+
+#endif // USE(PTHREADS)