service_runtime/win/lock_impl_win.cc

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32
  33 #include "native_client/include/portability.h"
  34 #include "native_client/service_runtime/win/lock_impl.h"
  35
  36 LockImpl::LockImpl() {
  37   mutex_ = CreateMutex(NULL, FALSE, NULL);
  38 }
  39
  40 LockImpl::~LockImpl() {
  41   CloseHandle(mutex_);
  42 }
  43
  44 bool LockImpl::Try() {
  45   DWORD dwWaitResult;
  46   dwWaitResult = WaitForSingleObject(mutex_, 0);
  47   switch (dwWaitResult) {
  48     case WAIT_OBJECT_0:
  49       return true;
  50     case WAIT_TIMEOUT:
  51       return false;
  52   }
  53   return false;
  54 }
  55
  56 void LockImpl::Lock() {
  57   WaitForSingleObject(mutex_, INFINITE);
  58 }
  59
  60 void LockImpl::Unlock() {
  61   ReleaseMutex(mutex_);
  62 }