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 "Threading.h"
28
29 #include <string.h>
30
31 namespace WTF {
32
33 struct NewThreadContext : FastAllocBase {
NewThreadContextWTF::NewThreadContext34 NewThreadContext(ThreadFunction entryPoint, void* data, const char* name)
35 : entryPoint(entryPoint)
36 , data(data)
37 , name(name)
38 {
39 }
40
41 ThreadFunction entryPoint;
42 void* data;
43 const char* name;
44
45 Mutex creationMutex;
46 };
47
threadEntryPoint(void * contextData)48 static void* threadEntryPoint(void* contextData)
49 {
50 NewThreadContext* context = reinterpret_cast<NewThreadContext*>(contextData);
51
52 // Block until our creating thread has completed any extra setup work, including
53 // establishing ThreadIdentifier.
54 {
55 MutexLocker locker(context->creationMutex);
56 }
57
58 initializeCurrentThreadInternal(context->name);
59
60 // Grab the info that we need out of the context, then deallocate it.
61 ThreadFunction entryPoint = context->entryPoint;
62 void* data = context->data;
63 delete context;
64
65 return entryPoint(data);
66 }
67
createThread(ThreadFunction entryPoint,void * data,const char * name)68 ThreadIdentifier createThread(ThreadFunction entryPoint, void* data, const char* name)
69 {
70 // Visual Studio has a 31-character limit on thread names. Longer names will
71 // be truncated silently, but we'd like callers to know about the limit.
72 #if !LOG_DISABLED
73 if (strlen(name) > 31)
74 LOG_ERROR("Thread name \"%s\" is longer than 31 characters and will be truncated by Visual Studio", name);
75 #endif
76
77 NewThreadContext* context = new NewThreadContext(entryPoint, data, name);
78
79 // Prevent the thread body from executing until we've established the thread identifier.
80 MutexLocker locker(context->creationMutex);
81
82 return createThreadInternal(threadEntryPoint, context, name);
83 }
84
85 #if PLATFORM(MAC) || PLATFORM(WIN)
86
87 // This function is deprecated but needs to be kept around for backward
88 // compatibility. Use the 3-argument version of createThread above.
89
90 ThreadIdentifier createThread(ThreadFunction entryPoint, void* data);
91
createThread(ThreadFunction entryPoint,void * data)92 ThreadIdentifier createThread(ThreadFunction entryPoint, void* data)
93 {
94 return createThread(entryPoint, data, 0);
95 }
96 #endif
97
98 } // namespace WTF
99