third_party/WebKit/Source/wtf/MainThread.cpp

   1 /*
   2 * Copyright (C) 2009 Google 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 are
   6 * met:
   7 *
   8 *     * Redistributions of source code must retain the above copyright
   9 * notice, this list of conditions and the following disclaimer.
  10 *     * Redistributions in binary form must reproduce the above
  11 * copyright notice, this list of conditions and the following disclaimer
  12 * in the documentation and/or other materials provided with the
  13 * distribution.
  14 *     * Neither the name of Google Inc. nor the names of its
  15 * contributors may be used to endorse or promote products derived from
  16 * this software without specific prior written permission.
  17 *
  18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29 */
  30
  31 #include "config.h"
  32 #include "wtf/MainThread.h"
  33
  34 #include "wtf/Assertions.h"
  35 #include "wtf/Functional.h"
  36 #include "wtf/Threading.h"
  37 #include "wtf/text/AtomicString.h"
  38
  39 namespace WTF {
  40
  41 static ThreadIdentifier mainThreadIdentifier;
  42 static void (*callOnMainThreadFunction)(MainThreadFunction, void*);
  43
  44 void initializeMainThread(void (*function)(MainThreadFunction, void*))
  45 {
  46     static bool initializedMainThread;
  47     if (initializedMainThread)
  48         return;
  49     initializedMainThread = true;
  50     callOnMainThreadFunction = function;
  51
  52     mainThreadIdentifier = currentThread();
  53
  54     AtomicString::init();
  55 }
  56
  57 namespace internal {
  58
  59 void callOnMainThread(MainThreadFunction* function, void* context)
  60 {
  61     (*callOnMainThreadFunction)(function, context);
  62 }
  63
  64 } // namespace internal
  65
  66 bool isMainThread()
  67 {
  68     return currentThread() == mainThreadIdentifier;
  69 }
  70
  71 } // namespace WTF