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 #include "utilities/globalDefinitions.hpp" 30 31 #define IMPLEMENTS_SEMAPHORE_CLASS 1 32 33 #if defined(TARGET_OS_FAMILY_bsd) 34 # include "semaphore_bsd.hpp" 35 #elif defined(TARGET_OS_FAMILY_linux) 36 # include "semaphore_linux.hpp" 37 #elif defined(TARGET_OS_FAMILY_solaris) 38 # include "semaphore_solaris.hpp" 39 #elif defined(TARGET_OS_FAMILY_windows) 40 # include "semaphore_windows.hpp" 41 #else 42 // Redefine for platforms that don't implement the Semaphore class. 43 # undef IMPLEMENTS_SEMAPHORE_CLASS 44 # define IMPLEMENTS_SEMAPHORE_CLASS 0 45 #endif 46 47 #if IMPLEMENTS_SEMAPHORE_CLASS 48 49 class Semaphore : public CHeapObj<mtInternal> { 50 public: 51 static const uint NoMaxCount = (uint)-1; 52 53 Semaphore(uint value = 0, uint max = NoMaxCount); 54 ~Semaphore(); 55 void signal(); 56 void signal(uint count); 57 void wait(); 58 bool trywait(); 59 bool timedwait(unsigned int sec, int nsec); 60 private: 61 os_semaphore_t _semaphore; 62 }; 63 64 #endif 65 66 #endif // SHARE_VM_UTILITIES_SEMAPHORE_HPP