1/*
2 * Copyright (C) 2013, 2016 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 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include <wtf/CompilationThread.h>
28
29#include <mutex>
30#include <wtf/StdLibExtras.h>
31#include <wtf/ThreadSpecific.h>
32#include <wtf/Threading.h>
33
34namespace WTF {
35
36static ThreadSpecific<bool, CanBeGCThread::True>* s_isCompilationThread;
37
38static void initializeCompilationThreads()
39{
40 static std::once_flag initializeCompilationThreadsOnceFlag;
41 std::call_once(initializeCompilationThreadsOnceFlag, []{
42 s_isCompilationThread = new ThreadSpecific<bool, CanBeGCThread::True>();
43 });
44}
45
46bool isCompilationThread()
47{
48 if (!s_isCompilationThread)
49 return false;
50 if (!s_isCompilationThread->isSet())
51 return false;
52 return **s_isCompilationThread;
53}
54
55bool exchangeIsCompilationThread(bool newValue)
56{
57 initializeCompilationThreads();
58 bool oldValue = isCompilationThread();
59 **s_isCompilationThread = newValue;
60 return oldValue;
61}
62
63} // namespace WTF
64
65