1 /*

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

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  *

    23  */

    24 

    25 #include "precompiled.hpp"

    26 #include "semaphore_windows.hpp"

    27 #include "utilities/debug.hpp"

    28 

    29 #include <windows.h>

    30 #include <errno.h>

    31 

    32 WindowsSemaphore::WindowsSemaphore(uint value) {

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

    34 

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

    36 }

    37 

    38 WindowsSemaphore::~WindowsSemaphore() {

    39   ::CloseHandle(_semaphore);

    40 }

    41 

    42 void WindowsSemaphore::signal(uint count) {

    43   if (count > 0) {

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

    45 

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

    47   }

    48 }

    49 

    50 void WindowsSemaphore::wait() {

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

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

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

    54 }

    55 

    56 bool WindowsSemaphore::trywait() {

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

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

    59   return ret == WAIT_OBJECT_0;

    60 }