wtf/Threading.cpp

   1 /*
   2  * Copyright (C) 2008 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "Threading.h"
  28
  29 namespace WTF {
  30
  31 struct NewThreadContext {
  32     NewThreadContext(ThreadFunction entryPoint, void* data)
  33         : entryPoint(entryPoint)
  34         , data(data)
  35     { }
  36
  37     ThreadFunction entryPoint;
  38     void* data;
  39
  40     Mutex creationMutex;
  41 };
  42
  43 static void* threadEntryPoint(void* contextData)
  44 {
  45     NewThreadContext* context = reinterpret_cast<NewThreadContext*>(contextData);
  46
  47     // Block until our creating thread has completed any extra setup work
  48     {
  49         MutexLocker locker(context->creationMutex);
  50     }
  51
  52     // Grab the info that we need out of the context, then deallocate it.
  53     ThreadFunction entryPoint = context->entryPoint;
  54     void* data = context->data;
  55     delete context;
  56
  57     return entryPoint(data);
  58 }
  59
  60 ThreadIdentifier createThread(ThreadFunction entryPoint, void* data, const char* name)
  61 {
  62     NewThreadContext* context = new NewThreadContext(entryPoint, data);
  63
  64     // Prevent the thread body from executing until we've established the thread identifier
  65     MutexLocker locker(context->creationMutex);
  66
  67     return createThreadInternal(threadEntryPoint, context, name);
  68 }
  69
  70 #if PLATFORM(MAC) || PLATFORM(WIN)
  71
  72 // This function is deprecated but needs to be kept around for backward
  73 // compatibility. Use the 3-argument version of createThread above.
  74
  75 ThreadIdentifier createThread(ThreadFunction entryPoint, void* data);
  76
  77 ThreadIdentifier createThread(ThreadFunction entryPoint, void* data)
  78 {
  79     return createThread(entryPoint, data, 0);
  80 }
  81 #endif
  82
  83 } // namespace WTF