wtf/gtk/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 Mutex& threadMapMutex()
  48 {
  49     static Mutex mutex;
  50     return mutex;
  51 }
  52
  53 void initializeThreading()
  54 {
  55     if (!g_thread_supported())
  56         g_thread_init(NULL);
  57     ASSERT(g_thread_supported());
  58
  59     if (!atomicallyInitializedStaticMutex) {
  60         atomicallyInitializedStaticMutex = new Mutex;
  61         threadMapMutex();
  62         initializeRandomNumberGenerator();
  63     }
  64 }
  65
  66 void lockAtomicallyInitializedStaticMutex()
  67 {
  68     ASSERT(atomicallyInitializedStaticMutex);
  69     atomicallyInitializedStaticMutex->lock();
  70 }
  71
  72 void unlockAtomicallyInitializedStaticMutex()
  73 {
  74     atomicallyInitializedStaticMutex->unlock();
  75 }
  76
  77 static HashMap<ThreadIdentifier, GThread*>& threadMap()
  78 {
  79     static HashMap<ThreadIdentifier, GThread*> map;
  80     return map;
  81 }
  82
  83 static ThreadIdentifier identifierByGthreadHandle(GThread*& thread)
  84 {
  85     MutexLocker locker(threadMapMutex());
  86
  87     HashMap<ThreadIdentifier, GThread*>::iterator i = threadMap().begin();
  88     for (; i != threadMap().end(); ++i) {
  89         if (i->second == thread)
  90             return i->first;
  91     }
  92
  93     return 0;
  94 }
  95
  96 static ThreadIdentifier establishIdentifierForThread(GThread*& thread)
  97 {
  98     ASSERT(!identifierByGthreadHandle(thread));
  99
 100     MutexLocker locker(threadMapMutex());
 101
 102     static ThreadIdentifier identifierCount = 1;
 103
 104     threadMap().add(identifierCount, thread);
 105
 106     return identifierCount++;
 107 }
 108
 109 static GThread* threadForIdentifier(ThreadIdentifier id)
 110 {
 111     MutexLocker locker(threadMapMutex());
 112
 113     return threadMap().get(id);
 114 }
 115
 116 static void clearThreadForIdentifier(ThreadIdentifier id)
 117 {
 118     MutexLocker locker(threadMapMutex());
 119
 120     ASSERT(threadMap().contains(id));
 121
 122     threadMap().remove(id);
 123 }
 124
 125 ThreadIdentifier createThreadInternal(ThreadFunction entryPoint, void* data, const char*)
 126 {
 127     GThread* thread;
 128     if (!(thread = g_thread_create(entryPoint, data, TRUE, 0))) {
 129         LOG_ERROR("Failed to create thread at entry point %p with data %p", entryPoint, data);
 130         return 0;
 131     }
 132
 133     ThreadIdentifier threadID = establishIdentifierForThread(thread);
 134     return threadID;
 135 }
 136
 137 void initializeCurrentThreadInternal(const char*)
 138 {
 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 Mutex::Mutex()
 168     : m_mutex(g_mutex_new())
 169 {
 170 }
 171
 172 Mutex::~Mutex()
 173 {
 174 }
 175
 176 void Mutex::lock()
 177 {
 178     g_mutex_lock(m_mutex.get());
 179 }
 180
 181 bool Mutex::tryLock()
 182 {
 183     return g_mutex_trylock(m_mutex.get());
 184 }
 185
 186 void Mutex::unlock()
 187 {
 188     g_mutex_unlock(m_mutex.get());
 189 }
 190
 191 ThreadCondition::ThreadCondition()
 192     : m_condition(g_cond_new())
 193 {
 194 }
 195
 196 ThreadCondition::~ThreadCondition()
 197 {
 198 }
 199
 200 void ThreadCondition::wait(Mutex& mutex)
 201 {
 202     g_cond_wait(m_condition.get(), mutex.impl().get());
 203 }
 204
 205 bool ThreadCondition::timedWait(Mutex& mutex, double absoluteTime)
 206 {
 207     // Time is in the past - return right away.
 208     if (absoluteTime < currentTime())
 209         return false;
 210
 211     // Time is too far in the future for g_cond_timed_wait - wait forever.
 212     if (absoluteTime > INT_MAX) {
 213         wait(mutex);
 214         return true;
 215     }
 216
 217     int timeSeconds = static_cast<int>(absoluteTime);
 218     int timeMicroseconds = static_cast<int>((absoluteTime - timeSeconds) * 1000000.0);
 219
 220     GTimeVal targetTime;
 221     targetTime.tv_sec = timeSeconds;
 222     targetTime.tv_usec = timeMicroseconds;
 223
 224     return g_cond_timed_wait(m_condition.get(), mutex.impl().get(), &targetTime);
 225 }
 226
 227 void ThreadCondition::signal()
 228 {
 229     g_cond_signal(m_condition.get());
 230 }
 231
 232 void ThreadCondition::broadcast()
 233 {
 234     g_cond_broadcast(m_condition.get());
 235 }
 236
 237
 238 }
 239
 240 #endif // !USE(PTHREADS)