wtf/ThreadingGtk.cpp

   1 /*
   2  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
   3  * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1.  Redistributions of source code must retain the above copyright
  10  *     notice, this list of conditions and the following disclaimer.
  11  * 2.  Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
  15  *     its contributors may be used to endorse or promote products derived
  16  *     from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "config.h"
  31 #include "Threading.h"
  32
  33 #if !USE(PTHREADS)
  34
  35 #include "CurrentTime.h"
  36 #include "HashMap.h"
  37 #include "MainThread.h"
  38 #include "RandomNumberSeed.h"
  39
  40 #include <glib.h>
  41 #include <limits.h>
  42
  43 namespace WTF {
  44
  45 static Mutex* atomicallyInitializedStaticMutex;
  46
  47 static ThreadIdentifier mainThreadIdentifier;
  48
  49 static Mutex& threadMapMutex()
  50 {
  51     static Mutex mutex;
  52     return mutex;
  53 }
  54
  55 void initializeThreading()
  56 {
  57     if (!g_thread_supported())
  58         g_thread_init(NULL);
  59     ASSERT(g_thread_supported());
  60
  61     if (!atomicallyInitializedStaticMutex) {
  62         atomicallyInitializedStaticMutex = new Mutex;
  63         threadMapMutex();
  64         initializeRandomNumberGenerator();
  65         mainThreadIdentifier = currentThread();
  66         initializeMainThread();
  67     }
  68 }
  69
  70 void lockAtomicallyInitializedStaticMutex()
  71 {
  72     ASSERT(atomicallyInitializedStaticMutex);
  73     atomicallyInitializedStaticMutex->lock();
  74 }
  75
  76 void unlockAtomicallyInitializedStaticMutex()
  77 {
  78     atomicallyInitializedStaticMutex->unlock();
  79 }
  80
  81 static HashMap<ThreadIdentifier, GThread*>& threadMap()
  82 {
  83     static HashMap<ThreadIdentifier, GThread*> map;
  84     return map;
  85 }
  86
  87 static ThreadIdentifier identifierByGthreadHandle(GThread*& thread)
  88 {
  89     MutexLocker locker(threadMapMutex());
  90
  91     HashMap<ThreadIdentifier, GThread*>::iterator i = threadMap().begin();
  92     for (; i != threadMap().end(); ++i) {
  93         if (i->second == thread)
  94             return i->first;
  95     }
  96
  97     return 0;
  98 }
  99
 100 static ThreadIdentifier establishIdentifierForThread(GThread*& thread)
 101 {
 102     ASSERT(!identifierByGthreadHandle(thread));
 103
 104     MutexLocker locker(threadMapMutex());
 105
 106     static ThreadIdentifier identifierCount = 1;
 107
 108     threadMap().add(identifierCount, thread);
 109
 110     return identifierCount++;
 111 }
 112
 113 static GThread* threadForIdentifier(ThreadIdentifier id)
 114 {
 115     MutexLocker locker(threadMapMutex());
 116
 117     return threadMap().get(id);
 118 }
 119
 120 static void clearThreadForIdentifier(ThreadIdentifier id)
 121 {
 122     MutexLocker locker(threadMapMutex());
 123
 124     ASSERT(threadMap().contains(id));
 125
 126     threadMap().remove(id);
 127 }
 128
 129 ThreadIdentifier createThreadInternal(ThreadFunction entryPoint, void* data, const char*)
 130 {
 131     GThread* thread;
 132     if (!(thread = g_thread_create(entryPoint, data, TRUE, 0))) {
 133         LOG_ERROR("Failed to create thread at entry point %p with data %p", entryPoint, data);
 134         return 0;
 135     }
 136
 137     ThreadIdentifier threadID = establishIdentifierForThread(thread);
 138     return threadID;
 139 }
 140
 141 int waitForThreadCompletion(ThreadIdentifier threadID, void** result)
 142 {
 143     ASSERT(threadID);
 144
 145     GThread* thread = threadForIdentifier(threadID);
 146
 147     void* joinResult = g_thread_join(thread);
 148     if (result)
 149         *result = joinResult;
 150
 151     clearThreadForIdentifier(threadID);
 152     return 0;
 153 }
 154
 155 void detachThread(ThreadIdentifier)
 156 {
 157 }
 158
 159 ThreadIdentifier currentThread()
 160 {
 161     GThread* currentThread = g_thread_self();
 162     if (ThreadIdentifier id = identifierByGthreadHandle(currentThread))
 163         return id;
 164     return establishIdentifierForThread(currentThread);
 165 }
 166
 167 bool isMainThread()
 168 {
 169     return currentThread() == mainThreadIdentifier;
 170 }
 171
 172 Mutex::Mutex()
 173     : m_mutex(g_mutex_new())
 174 {
 175 }
 176
 177 Mutex::~Mutex()
 178 {
 179 }
 180
 181 void Mutex::lock()
 182 {
 183     g_mutex_lock(m_mutex.get());
 184 }
 185
 186 bool Mutex::tryLock()
 187 {
 188     return g_mutex_trylock(m_mutex.get());
 189 }
 190
 191 void Mutex::unlock()
 192 {
 193     g_mutex_unlock(m_mutex.get());
 194 }
 195
 196 ThreadCondition::ThreadCondition()
 197     : m_condition(g_cond_new())
 198 {
 199 }
 200
 201 ThreadCondition::~ThreadCondition()
 202 {
 203 }
 204
 205 void ThreadCondition::wait(Mutex& mutex)
 206 {
 207     g_cond_wait(m_condition.get(), mutex.impl().get());
 208 }
 209
 210 bool ThreadCondition::timedWait(Mutex& mutex, double absoluteTime)
 211 {
 212     // Time is in the past - return right away.
 213     if (absoluteTime < currentTime())
 214         return false;
 215
 216     // Time is too far in the future for g_cond_timed_wait - wait forever.
 217     if (absoluteTime > INT_MAX) {
 218         wait(mutex);
 219         return true;
 220     }
 221
 222     int timeSeconds = static_cast<int>(absoluteTime);
 223     int timeMicroseconds = static_cast<int>((absoluteTime - timeSeconds) * 1000000.0);
 224
 225     GTimeVal targetTime;
 226     targetTime.tv_sec = timeSeconds;
 227     targetTime.tv_usec = timeMicroseconds;
 228
 229     return g_cond_timed_wait(m_condition.get(), mutex.impl().get(), &targetTime);
 230 }
 231
 232 void ThreadCondition::signal()
 233 {
 234     g_cond_signal(m_condition.get());
 235 }
 236
 237 void ThreadCondition::broadcast()
 238 {
 239     g_cond_broadcast(m_condition.get());
 240 }
 241
 242
 243 }
 244
 245 #endif // !USE(PTHREADS)