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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 #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 void callOnMainThread(MainThreadFunction* function, void* context)
     58 {
     59     (*callOnMainThreadFunction)(function, context);
     60 }
     61 
     62 static void callFunctionObject(void* context)
     63 {
     64     Function<void()>* function = static_cast<Function<void()>*>(context);
     65     (*function)();
     66     delete function;
     67 }
     68 
     69 void callOnMainThread(const Function<void()>& function)
     70 {
     71     callOnMainThread(callFunctionObject, new Function<void()>(function));
     72 }
     73 
     74 bool isMainThread()
     75 {
     76     return currentThread() == mainThreadIdentifier;
     77 }
     78 
     79 } // namespace WTF
     80 
     81