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      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 
     38 namespace WTF {
     39 
     40 static ThreadIdentifier mainThreadIdentifier;
     41 static void (*callOnMainThreadFunction)(MainThreadFunction, void*);
     42 
     43 void initializeMainThread(void (*function)(MainThreadFunction, void*))
     44 {
     45     static bool initializedMainThread;
     46     if (initializedMainThread)
     47         return;
     48     initializedMainThread = true;
     49     callOnMainThreadFunction = function;
     50 
     51     mainThreadIdentifier = currentThread();
     52 }
     53 
     54 void callOnMainThread(MainThreadFunction* function, void* context)
     55 {
     56     (*callOnMainThreadFunction)(function, context);
     57 }
     58 
     59 static void callFunctionObject(void* context)
     60 {
     61     Function<void()>* function = static_cast<Function<void()>*>(context);
     62     (*function)();
     63     delete function;
     64 }
     65 
     66 void callOnMainThread(const Function<void()>& function)
     67 {
     68     callOnMainThread(callFunctionObject, new Function<void()>(function));
     69 }
     70 
     71 bool isMainThread()
     72 {
     73     return currentThread() == mainThreadIdentifier;
     74 }
     75 
     76 } // namespace WTF
     77 
     78