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1 /*
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2 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #ifndef _MONITOR_
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26 #define _MONITOR_
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27
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28 #include <windows.h>
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29
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30 class Monitor {
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31 public:
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32 Monitor();
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33 ~Monitor();
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34
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35 void lock();
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36 void unlock();
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37 // Default time is forever (i.e, zero). Returns true if it times-out, otherwise
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38 // false.
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39 bool wait(long timeout = 0);
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40 bool notify();
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41 bool notifyAll();
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42
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43 private:
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44 HANDLE owner();
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45 void setOwner(HANDLE owner);
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46 bool ownedBySelf();
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47
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48 HANDLE _owner;
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49 long _lock_count;
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50 HANDLE _lock_event; // Auto-reset event for blocking in lock()
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51 HANDLE _wait_event; // Manual-reset event for notifications
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52 long _counter; // Current number of notifications
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53 long _waiters; // Number of threads waiting for notification
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54 long _tickets; // Number of waiters to be notified
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55 };
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56
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57
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58 #endif // #defined _MONITOR_
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