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      1 /*
      2  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
      3  * Copyright (C) 2007 Justin Haygood (jhaygood (at) 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 #include <wtf/StdLibExtras.h>
     40 
     41 #include <glib.h>
     42 #include <limits.h>
     43 
     44 namespace WTF {
     45 
     46 typedef HashMap<ThreadIdentifier, GThread*> ThreadMap;
     47 
     48 static Mutex* atomicallyInitializedStaticMutex;
     49 
     50 static Mutex& threadMapMutex()
     51 {
     52     DEFINE_STATIC_LOCAL(Mutex, mutex, ());
     53     return mutex;
     54 }
     55 
     56 void initializeThreading()
     57 {
     58     if (!g_thread_supported())
     59         g_thread_init(NULL);
     60     ASSERT(g_thread_supported());
     61 
     62     if (!atomicallyInitializedStaticMutex) {
     63         atomicallyInitializedStaticMutex = new Mutex;
     64         threadMapMutex();
     65         initializeRandomNumberGenerator();
     66     }
     67 }
     68 
     69 void lockAtomicallyInitializedStaticMutex()
     70 {
     71     ASSERT(atomicallyInitializedStaticMutex);
     72     atomicallyInitializedStaticMutex->lock();
     73 }
     74 
     75 void unlockAtomicallyInitializedStaticMutex()
     76 {
     77     atomicallyInitializedStaticMutex->unlock();
     78 }
     79 
     80 static ThreadMap& threadMap()
     81 {
     82     DEFINE_STATIC_LOCAL(ThreadMap, map, ());
     83     return map;
     84 }
     85 
     86 static ThreadIdentifier identifierByGthreadHandle(GThread*& thread)
     87 {
     88     MutexLocker locker(threadMapMutex());
     89 
     90     ThreadMap::iterator i = threadMap().begin();
     91     for (; i != threadMap().end(); ++i) {
     92         if (i->second == thread)
     93             return i->first;
     94     }
     95 
     96     return 0;
     97 }
     98 
     99 static ThreadIdentifier establishIdentifierForThread(GThread*& thread)
    100 {
    101     ASSERT(!identifierByGthreadHandle(thread));
    102 
    103     MutexLocker locker(threadMapMutex());
    104 
    105     static ThreadIdentifier identifierCount = 1;
    106 
    107     threadMap().add(identifierCount, thread);
    108 
    109     return identifierCount++;
    110 }
    111 
    112 static GThread* threadForIdentifier(ThreadIdentifier id)
    113 {
    114     MutexLocker locker(threadMapMutex());
    115 
    116     return threadMap().get(id);
    117 }
    118 
    119 static void clearThreadForIdentifier(ThreadIdentifier id)
    120 {
    121     MutexLocker locker(threadMapMutex());
    122 
    123     ASSERT(threadMap().contains(id));
    124 
    125     threadMap().remove(id);
    126 }
    127 
    128 ThreadIdentifier createThreadInternal(ThreadFunction entryPoint, void* data, const char*)
    129 {
    130     GThread* thread;
    131     if (!(thread = g_thread_create(entryPoint, data, TRUE, 0))) {
    132         LOG_ERROR("Failed to create thread at entry point %p with data %p", entryPoint, data);
    133         return 0;
    134     }
    135 
    136     ThreadIdentifier threadID = establishIdentifierForThread(thread);
    137     return threadID;
    138 }
    139 
    140 void initializeCurrentThreadInternal(const char*)
    141 {
    142 }
    143 
    144 int waitForThreadCompletion(ThreadIdentifier threadID, void** result)
    145 {
    146     ASSERT(threadID);
    147 
    148     GThread* thread = threadForIdentifier(threadID);
    149 
    150     void* joinResult = g_thread_join(thread);
    151     if (result)
    152         *result = joinResult;
    153 
    154     clearThreadForIdentifier(threadID);
    155     return 0;
    156 }
    157 
    158 void detachThread(ThreadIdentifier)
    159 {
    160 }
    161 
    162 ThreadIdentifier currentThread()
    163 {
    164     GThread* currentThread = g_thread_self();
    165     if (ThreadIdentifier id = identifierByGthreadHandle(currentThread))
    166         return id;
    167     return establishIdentifierForThread(currentThread);
    168 }
    169 
    170 void yield()
    171 {
    172     g_thread_yield();
    173 }
    174 
    175 Mutex::Mutex()
    176     : m_mutex(g_mutex_new())
    177 {
    178 }
    179 
    180 Mutex::~Mutex()
    181 {
    182 }
    183 
    184 void Mutex::lock()
    185 {
    186     g_mutex_lock(m_mutex.get());
    187 }
    188 
    189 bool Mutex::tryLock()
    190 {
    191     return g_mutex_trylock(m_mutex.get());
    192 }
    193 
    194 void Mutex::unlock()
    195 {
    196     g_mutex_unlock(m_mutex.get());
    197 }
    198 
    199 ThreadCondition::ThreadCondition()
    200     : m_condition(g_cond_new())
    201 {
    202 }
    203 
    204 ThreadCondition::~ThreadCondition()
    205 {
    206 }
    207 
    208 void ThreadCondition::wait(Mutex& mutex)
    209 {
    210     g_cond_wait(m_condition.get(), mutex.impl().get());
    211 }
    212 
    213 bool ThreadCondition::timedWait(Mutex& mutex, double absoluteTime)
    214 {
    215     // Time is in the past - return right away.
    216     if (absoluteTime < currentTime())
    217         return false;
    218 
    219     // Time is too far in the future for g_cond_timed_wait - wait forever.
    220     if (absoluteTime > INT_MAX) {
    221         wait(mutex);
    222         return true;
    223     }
    224 
    225     int timeSeconds = static_cast<int>(absoluteTime);
    226     int timeMicroseconds = static_cast<int>((absoluteTime - timeSeconds) * 1000000.0);
    227 
    228     GTimeVal targetTime;
    229     targetTime.tv_sec = timeSeconds;
    230     targetTime.tv_usec = timeMicroseconds;
    231 
    232     return g_cond_timed_wait(m_condition.get(), mutex.impl().get(), &targetTime);
    233 }
    234 
    235 void ThreadCondition::signal()
    236 {
    237     g_cond_signal(m_condition.get());
    238 }
    239 
    240 void ThreadCondition::broadcast()
    241 {
    242     g_cond_broadcast(m_condition.get());
    243 }
    244 
    245 
    246 }
    247 
    248 #endif // !USE(PTHREADS)
    249