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authorNeo2003 <none@none>2008-10-02 16:23:55 -0500
committerNeo2003 <none@none>2008-10-02 16:23:55 -0500
commit9b1c0e006f20091f28f3f468cfcab1feb51286bd (patch)
treeb5d1ba94a656e6679f8737f9ea6bed1239b73b14 /dep/include/zthread/Waitable.h
[svn] * Proper SVN structureinit
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+/*
+ * Copyright (c) 2005, Eric Crahen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __ZTWAITABLE_H__
+#define __ZTWAITABLE_H__
+
+#include "zthread/Exceptions.h"
+
+namespace ZThread {
+
+ /**
+ * @class Waitable
+ *
+ * @author Eric Crahen <http://www.code-foo.com>
+ * @date <2003-07-16T22:16:41-0400>
+ * @version 2.3.0
+ *
+ * The Waitable interface defines a common method of adding generic <i>wait</i> semantics
+ * to a class.
+ *
+ * <b>Waiting</b>
+ *
+ * An object implementing the Waitable interface externalizes a mechanism for testing
+ * some internal condition. Another object may <i>wait()</i>s for a Waitable object;
+ * in doing so, it wait()s for that condition to become true by blocking the caller
+ * while the condition is false.
+ *
+ * For example, a Condition is Waitable object that extends <i>wait</i> semantics
+ * so that wait()ing means a thread is blocked until some external stimulus
+ * specifically performs an operation on the Condition to make its internal condition true.
+ * (serialization aside)
+ *
+ * A Barrier extends <i>wait</i> semantics so that wait()ing mean waiting for other
+ * waiters, and may include automatically resetting the condition once a wait is complete.
+ *
+ * @see Condition
+ * @see Barrier
+ * @see Executor
+ */
+ class Waitable {
+ public:
+
+ //! Destroy a Waitable object.
+ virtual ~Waitable() {}
+
+ /**
+ * Waiting on an object will generally cause the calling thread to be blocked
+ * for some indefinite period of time. The thread executing will not proceed
+ * any further until the Waitable object releases it unless or an exception
+ * is thrown.
+ */
+ virtual void wait() = 0;
+
+ /**
+ * Waiting on an object will generally cause the calling thread to be blocked
+ * for some indefinite period of time. The thread executing will not proceed
+ * any further until the Waitable object releases it unless or an exception
+ * is thrown.
+ *
+ * @param timeout maximum amount of time, in milliseconds, to spend waiting.
+ *
+ * @return
+ * - <em>true</em> if the set of tasks being wait for complete before
+ * <i>timeout</i> milliseconds elapse.
+ * - <em>false</em> othewise.
+ */
+ virtual bool wait(unsigned long timeout) = 0;
+
+
+ }; /* Waitable */
+
+
+} // namespace ZThread
+
+#endif // __ZTWAITABLE_H__