third_party/WebKit/Source/wtf/WTF.cpp

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "wtf/WTF.h"

#include "wtf/Assertions.h"
#include "wtf/Functional.h"
#include "wtf/Threading.h"
#include "wtf/allocator/Partitions.h"
#include "wtf/text/AtomicString.h"
#include "wtf/text/StringStatics.h"
#include "wtf/typed_arrays/ArrayBufferContents.h"

namespace WTF {

extern void initializeThreading();

bool s_initialized;
bool s_shutdown;
void (*s_callOnMainThreadFunction)(MainThreadFunction, void*);
ThreadIdentifier s_mainThreadIdentifier;

namespace internal {

void callOnMainThread(MainThreadFunction* function, void* context)
{
    (*s_callOnMainThreadFunction)(function, context);
}

} // namespace internal

bool isMainThread()
{
    return currentThread() == s_mainThreadIdentifier;
}

void initialize(void (*callOnMainThreadFunction)(MainThreadFunction, void*))
{
    // WTF, and Blink in general, cannot handle being re-initialized, even if shutdown first.
    // Make that explicit here.
    RELEASE_ASSERT(!s_initialized);
    RELEASE_ASSERT(!s_shutdown);
    s_initialized = true;
    initializeThreading();

    s_callOnMainThreadFunction = callOnMainThreadFunction;
    s_mainThreadIdentifier = currentThread();
    AtomicString::init();
    StringStatics::init();
}

void shutdown()
{
    RELEASE_ASSERT(s_initialized);
    RELEASE_ASSERT(!s_shutdown);
    s_shutdown = true;
}

bool isShutdown()
{
    return s_shutdown;
}

} // namespace WTF