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      1 /*
      2  * Copyright (C) 2008, 2009 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 "wtf/Threading.h"
     28 
     29 #include "wtf/OwnPtr.h"
     30 #include "wtf/PassOwnPtr.h"
     31 #include "wtf/ThreadingPrimitives.h"
     32 #include <string.h>
     33 
     34 namespace WTF {
     35 
     36 struct NewThreadContext {
     37 public:
     38     NewThreadContext(ThreadFunction entryPoint, void* data, const char* name)
     39         : entryPoint(entryPoint)
     40         , data(data)
     41         , name(name)
     42     {
     43     }
     44 
     45     ThreadFunction entryPoint;
     46     void* data;
     47     const char* name;
     48 
     49     Mutex creationMutex;
     50 };
     51 
     52 static void threadEntryPoint(void* contextData)
     53 {
     54     NewThreadContext* context = reinterpret_cast<NewThreadContext*>(contextData);
     55 
     56     // Block until our creating thread has completed any extra setup work, including
     57     // establishing ThreadIdentifier.
     58     {
     59         MutexLocker locker(context->creationMutex);
     60     }
     61 
     62     initializeCurrentThreadInternal(context->name);
     63 
     64     // Grab the info that we need out of the context, then deallocate it.
     65     ThreadFunction entryPoint = context->entryPoint;
     66     void* data = context->data;
     67     delete context;
     68 
     69     entryPoint(data);
     70 }
     71 
     72 ThreadIdentifier createThread(ThreadFunction entryPoint, void* data, const char* name)
     73 {
     74     // Visual Studio has a 31-character limit on thread names. Longer names will
     75     // be truncated silently, but we'd like callers to know about the limit.
     76 #if !LOG_DISABLED
     77     if (name && strlen(name) > 31)
     78         LOG_ERROR("Thread name \"%s\" is longer than 31 characters and will be truncated by Visual Studio", name);
     79 #endif
     80 
     81     NewThreadContext* context = new NewThreadContext(entryPoint, data, name);
     82 
     83     // Prevent the thread body from executing until we've established the thread identifier.
     84     MutexLocker locker(context->creationMutex);
     85 
     86     return createThreadInternal(threadEntryPoint, context, name);
     87 }
     88 
     89 } // namespace WTF
     90