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 {
34 WTF_MAKE_FAST_ALLOCATED;
35 public:
NewThreadContextWTF::NewThreadContext36 NewThreadContext(ThreadFunction entryPoint, void* data, const char* name)
37 : entryPoint(entryPoint)
38 , data(data)
39 , name(name)
40 {
41 }
42
43 ThreadFunction entryPoint;
44 void* data;
45 const char* name;
46
47 Mutex creationMutex;
48 };
49
threadEntryPoint(void * contextData)50 static void* threadEntryPoint(void* contextData)
51 {
52 NewThreadContext* context = reinterpret_cast<NewThreadContext*>(contextData);
53
54 // Block until our creating thread has completed any extra setup work, including
55 // establishing ThreadIdentifier.
56 {
57 MutexLocker locker(context->creationMutex);
58 }
59
60 initializeCurrentThreadInternal(context->name);
61
62 // Grab the info that we need out of the context, then deallocate it.
63 ThreadFunction entryPoint = context->entryPoint;
64 void* data = context->data;
65 delete context;
66
67 return entryPoint(data);
68 }
69
createThread(ThreadFunction entryPoint,void * data,const char * name)70 ThreadIdentifier createThread(ThreadFunction entryPoint, void* data, const char* name)
71 {
72 // Visual Studio has a 31-character limit on thread names. Longer names will
73 // be truncated silently, but we'd like callers to know about the limit.
74 #if !LOG_DISABLED
75 if (strlen(name) > 31)
76 LOG_ERROR("Thread name \"%s\" is longer than 31 characters and will be truncated by Visual Studio", name);
77 #endif
78
79 NewThreadContext* context = new NewThreadContext(entryPoint, data, name);
80
81 // Prevent the thread body from executing until we've established the thread identifier.
82 MutexLocker locker(context->creationMutex);
83
84 return createThreadInternal(threadEntryPoint, context, name);
85 }
86
87 #if PLATFORM(MAC) || PLATFORM(WIN)
88
89 // This function is deprecated but needs to be kept around for backward
90 // compatibility. Use the 3-argument version of createThread above.
91
92 ThreadIdentifier createThread(ThreadFunction entryPoint, void* data);
93
createThread(ThreadFunction entryPoint,void * data)94 ThreadIdentifier createThread(ThreadFunction entryPoint, void* data)
95 {
96 return createThread(entryPoint, data, 0);
97 }
98 #endif
99
100 } // namespace WTF
101