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, err_msg("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, err_msg("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, err_msg("WaitForSingleObject failed with error code: %lu", GetLastError())); 53 assert(ret == WAIT_OBJECT_0, err_msg("WaitForSingleObject failed with return value: %lu", ret)); 54 } 55 56 bool WindowsSemaphore::trywait() { 57 DWORD ret = ::WaitForSingleObject(_semaphore, 0); 58 assert(ret != WAIT_FAILED, err_msg("WaitForSingleObject failed with error code: %lu", GetLastError())); 59 return ret == WAIT_OBJECT_0; 60 }