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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/Condition.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 __ZTCONDITION_H__
+#define __ZTCONDITION_H__
+
+#include "zthread/Lockable.h"
+#include "zthread/NonCopyable.h"
+#include "zthread/Waitable.h"
+
+namespace ZThread {
+
+ class FifoConditionImpl;
+
+ /**
+ * @class Condition
+ * @author Eric Crahen <http://www.code-foo.com>
+ * @date <2003-07-16T14:38:59-0400>
+ * @version 2.2.1
+ *
+ * A Condition is a Waitable object used to block a thread until a particular
+ * condition is met. A Condition object is always used in conjunction with Lockable
+ * object. This object should be a FastMutex, Mutex, PriorityMutex or PriorityInheritanceMutex.
+ *
+ * Condition objects are reminiscent of POSIX condition variables in several ways but
+ * are slightly different.
+ *
+ * A Condition is <i>not</i> subject to spurious wakeup.
+ *
+ * Like all Waitable objects, Conditions are sensitive to Thread::interupt() which can
+ * be used to prematurely end a wait().
+ *
+ * @see Thread::interupt()
+ *
+ * Before a wait() is performed on a Condition, the associated Lockable object should
+ * have been acquire()ed. When the wait() begins, that Lockable object is release()d
+ * (wait() will atomically begin the wait and unlock the Lockable).
+ *
+ * A thread blocked by wait() will remain so until an exception occurs, or until
+ * the thread awakened by a signal() or broadcast(). When the thread resumes execution,
+ * the associated Lockable is acquire()d before wait() returns.
+ *
+ * <b>Scheduling</b>
+ *
+ * Threads blocked on a Condition are resumed in FIFO order.
+ */
+ class ZTHREAD_API Condition : public Waitable, private NonCopyable {
+
+ FifoConditionImpl* _impl;
+
+ public:
+
+ /**
+ * Create a Condition associated with the given Lockable object.
+ *
+ * @param l Lockable object to associate with this Condition object.
+ */
+ Condition(Lockable& l);
+
+ //! Destroy Condition object
+ virtual ~Condition();
+
+ /**
+ * Wake <em>one</em> thread waiting on this Condition.
+ *
+ * The associated Lockable need not have been acquire when this function is
+ * invoked.
+ *
+ * @post a waiting thread, if any exists, will be awakened.
+ */
+ void signal();
+
+ /**
+ * Wake <em>all</em> threads wait()ing on this Condition.
+ *
+ * The associated Lockable need not have been acquire when this function is
+ * invoked.
+ *
+ * @post all wait()ing threads, if any exist, will be awakened.
+ */
+ void broadcast();
+
+ /**
+ * Wait for this Condition, blocking the calling thread until a signal or broadcast
+ * is received.
+ *
+ * This operation atomically releases the associated Lockable and blocks the calling thread.
+ *
+ * @exception Interrupted_Exception thrown when the calling thread is interrupted.
+ * A thread may be interrupted at any time, prematurely ending any wait.
+ *
+ * @pre The thread calling this method must have first acquired the associated
+ * Lockable object.
+ *
+ * @post A thread that has resumed execution without exception (because of a signal(),
+ * broadcast() or exception) will have acquire()d the associated Lockable object
+ * before returning from a wait().
+ *
+ * @see Waitable::wait()
+ */
+ virtual void wait();
+
+ /**
+ * Wait for this Condition, blocking the calling thread until a signal or broadcast
+ * is received.
+ *
+ * This operation atomically releases the associated Lockable and blocks the calling thread.
+ *
+ * @param timeout maximum amount of time (milliseconds) this method could block
+ *
+ * @return
+ * - <em>true</em> if the Condition receives a signal or broadcast before
+ * <i>timeout</i> milliseconds elapse.
+ * - <em>false</em> otherwise.
+ *
+ * @exception Interrupted_Exception thrown when the calling thread is interrupted.
+ * A thread may be interrupted at any time, prematurely ending any wait.
+ *
+ * @pre The thread calling this method must have first acquired the associated
+ * Lockable object.
+ *
+ * @post A thread that has resumed execution without exception (because of a signal(),
+ * broadcast() or exception) will have acquire()d the associated Lockable object
+ * before returning from a wait().
+ *
+ * @see Waitable::wait(unsigned long timeout)
+ */
+ virtual bool wait(unsigned long timeout);
+
+
+ };
+
+} // namespace ZThread
+
+#endif // __ZTCONDITION_H__