/*

 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "semaphore_windows.hpp"

#include "utilities/debug.hpp"

#include <windows.h>

#include <errno.h>

WindowsSemaphore::WindowsSemaphore(uint value) {

  _semaphore = ::CreateSemaphore(NULL, value, LONG_MAX, NULL);

  guarantee(_semaphore != NULL, "CreateSemaphore failed with error code: %lu", GetLastError());

}

WindowsSemaphore::~WindowsSemaphore() {

  ::CloseHandle(_semaphore);

}

void WindowsSemaphore::signal(uint count) {

  if (count > 0) {

    BOOL ret = ::ReleaseSemaphore(_semaphore, count, NULL);

    assert(ret != 0, "ReleaseSemaphore failed with error code: %lu", GetLastError());

  }

}

void WindowsSemaphore::wait() {

  DWORD ret = ::WaitForSingleObject(_semaphore, INFINITE);

  assert(ret != WAIT_FAILED,   "WaitForSingleObject failed with error code: %lu", GetLastError());

  assert(ret == WAIT_OBJECT_0, "WaitForSingleObject failed with return value: %lu", ret);

}

bool WindowsSemaphore::trywait() {

  DWORD ret = ::WaitForSingleObject(_semaphore, 0);

  assert(ret != WAIT_FAILED,   "WaitForSingleObject failed with error code: %lu", GetLastError());

  return ret == WAIT_OBJECT_0;

}