1 /* 2 * Copyright (c) 2001, 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 _MONITOR_ 26 #define _MONITOR_ 27 28 #include <windows.h> 29 30 class Monitor { 31 public: 32 Monitor(); 33 ~Monitor(); 34 35 void lock(); 36 void unlock(); 37 // Default time is forever (i.e, zero). Returns true if it times-out, otherwise 38 // false. 39 bool wait(long timeout = 0); 40 bool notify(); 41 bool notifyAll(); 42 43 private: 44 HANDLE owner(); 45 void setOwner(HANDLE owner); 46 bool ownedBySelf(); 47 48 HANDLE _owner; 49 long _lock_count; 50 HANDLE _lock_event; // Auto-reset event for blocking in lock() 51 HANDLE _wait_event; // Manual-reset event for notifications 52 long _counter; // Current number of notifications 53 long _waiters; // Number of threads waiting for notification 54 long _tickets; // Number of waiters to be notified 55 }; 56 57 58 #endif // #defined _MONITOR_