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_BSD_VM_SEMAPHORE_BSD_HPP 26 #define OS_BSD_VM_SEMAPHORE_BSD_HPP 27 28 #ifndef __APPLE__ 29 // Use POSIX semaphores. 30 # include "semaphore_posix.hpp" 31 32 #else 33 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used. 34 # include "memory/allocation.hpp" 35 # include <mach/semaphore.h> 36 37 class OSXSemaphore : public CHeapObj<mtInternal>{ 38 semaphore_t _semaphore; 39 40 // Prevent copying and assignment. 41 OSXSemaphore(const OSXSemaphore&); 42 OSXSemaphore& operator=(const OSXSemaphore&); 43 44 public: 45 OSXSemaphore(uint value = 0); 46 ~OSXSemaphore(); 47 48 void signal(uint count = 1); 49 50 void wait(); 51 52 bool trywait(); 53 bool timedwait(unsigned int sec, int nsec); 54 55 private: 56 static jlong currenttime(); 57 }; 58 59 typedef OSXSemaphore SemaphoreImpl; 60 61 #endif // __APPLE__ 62 63 #endif // OS_BSD_VM_SEMAPHORE_BSD_HPP