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
34namespace WTF {
35
36struct NewThreadContext {
37public:
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
52static 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
72ThreadIdentifier 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        WTF_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