1 /* 2 * Copyright (c) 2015, 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 #ifndef SHARE_VM_UTILITIES_SEMAPHORE_HPP 26 #define SHARE_VM_UTILITIES_SEMAPHORE_HPP 27 28 #include "memory/allocation.hpp" 29 30 #if defined(TARGET_OS_FAMILY_linux) || defined(TARGET_OS_FAMILY_solaris) || defined(TARGET_OS_FAMILY_aix) 31 # include "semaphore_posix.hpp" 32 #elif defined(TARGET_OS_FAMILY_bsd) 33 # include "semaphore_bsd.hpp" 34 #elif defined(TARGET_OS_FAMILY_windows) 35 # include "semaphore_windows.hpp" 36 #else 37 # error "No semaphore implementation provided for this OS" 38 #endif 39 40 class Semaphore : public CHeapObj<mtInternal> { 41 private: 42 // Prevent copying and assignment of Semaphore instances. 43 Semaphore(const Semaphore&); 44 Semaphore& operator=(const Semaphore&); 45 46 protected: 47 os_semaphore_t _semaphore; 48 49 public: 50 Semaphore(uint value = 0); 51 virtual ~Semaphore(); 52 53 void signal(uint count = 1); 54 55 void wait(); 56 }; 57 58 #endif // SHARE_VM_UTILITIES_SEMAPHORE_HPP