1 /* 2 * Copyright (c) 2015, 2019, 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_RUNTIME_SEMAPHORE_HPP 26 #define SHARE_VM_RUNTIME_SEMAPHORE_HPP 27 28 #include "memory/allocation.hpp" 29 30 #if defined(LINUX) || defined(SOLARIS) || defined(AIX) 31 # include "semaphore_posix.hpp" 32 #elif defined(BSD) 33 # include "semaphore_bsd.hpp" 34 #elif defined(_WINDOWS) 35 # include "semaphore_windows.hpp" 36 #else 37 # error "No semaphore implementation provided for this OS" 38 #endif 39 40 // Implements the limited, platform independent Semaphore API. 41 class Semaphore : public CHeapObj<mtInternal> { 42 SemaphoreImpl _impl; 43 44 // Prevent copying and assignment of Semaphore instances. 45 Semaphore(const Semaphore&); 46 Semaphore& operator=(const Semaphore&); 47 48 public: 49 Semaphore(uint value = 0) : _impl(value) {} 50 ~Semaphore() {} 51 52 void signal(uint count = 1) { _impl.signal(count); } 53 54 void wait() { _impl.wait(); } 55 56 bool trywait() { return _impl.trywait(); } 57 }; 58 59 60 #endif // SHARE_VM_RUNTIME_SEMAPHORE_HPP