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 OS_POSIX_VM_SEMAPHORE_POSIX_HPP 26 #define OS_POSIX_VM_SEMAPHORE_POSIX_HPP 27 28 #include "memory/allocation.hpp" 29 30 #include <semaphore.h> 31 32 class PosixSemaphore : public CHeapObj<mtInternal> { 33 sem_t _semaphore; 34 35 // Prevent copying and assignment. 36 PosixSemaphore(const PosixSemaphore&); 37 PosixSemaphore& operator=(const PosixSemaphore&); 38 39 public: 40 PosixSemaphore(uint value = 0); 41 ~PosixSemaphore(); 42 43 void signal(uint count = 1); 44 45 void wait(); 46 47 bool trywait(); 48 bool timedwait(unsigned int sec, int nsec) { 49 return timedwait(create_timespec(sec, nsec)); 50 } 51 52 private: 53 bool timedwait(struct timespec ts); 54 55 // OS specific implementation to create a timespec suitable for semaphores. 56 struct timespec create_timespec(unsigned int set, int nsec); 57 }; 58 59 typedef PosixSemaphore SemaphoreImpl; 60 61 #endif // OS_POSIX_VM_SEMAPHORE_POSIX_HPP