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      1 /*
      2  * Copyright (C) 2011 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. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "BinarySemaphore.h"
     28 
     29 namespace CoreIPC {
     30 
     31 BinarySemaphore::BinarySemaphore()
     32     : m_event(::CreateEventW(0, FALSE, FALSE, 0))
     33 {
     34 }
     35 
     36 BinarySemaphore::~BinarySemaphore()
     37 {
     38     ::CloseHandle(m_event);
     39 }
     40 
     41 void BinarySemaphore::signal()
     42 {
     43     ::SetEvent(m_event);
     44 }
     45 
     46 bool BinarySemaphore::wait(double absoluteTime)
     47 {
     48     DWORD interval = absoluteTimeToWaitTimeoutInterval(absoluteTime);
     49     if (!interval) {
     50         // Consider the wait to have timed out, even if the event has already been signaled, to
     51         // match the WTF::ThreadCondition implementation.
     52         return false;
     53     }
     54 
     55     DWORD result = ::WaitForSingleObjectEx(m_event, interval, FALSE);
     56     switch (result) {
     57     case WAIT_OBJECT_0:
     58         // The event was signaled.
     59         return true;
     60 
     61     case WAIT_TIMEOUT:
     62         // The wait timed out.
     63         return false;
     64 
     65     case WAIT_FAILED:
     66         ASSERT_WITH_MESSAGE(false, "::WaitForSingleObjectEx failed with error %lu", ::GetLastError());
     67         return false;
     68     default:
     69         ASSERT_WITH_MESSAGE(false, "::WaitForSingleObjectEx returned unexpected result %lu", result);
     70         return false;
     71     }
     72 }
     73 
     74 } // namespace CoreIPC
     75