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
WindowsSemaphore(uint value)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
~WindowsSemaphore()38 WindowsSemaphore::~WindowsSemaphore() {
39 ::CloseHandle(_semaphore);
40 }
41
signal(uint count)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
wait()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
trywait()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 }
61