Condition.hxx
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- #if !defined(VOCAL_CONDITION_HXX)
- #define VOCAL_CONDITION_HXX
- /* ====================================================================
- * The Vovida Software License, Version 1.0
- *
- * Copyright (c) 2000 Vovida Networks, Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The names "VOCAL", "Vovida Open Communication Application Library",
- * and "Vovida Open Communication Application Library (VOCAL)" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact vocal@vovida.org.
- *
- * 4. Products derived from this software may not be called "VOCAL", nor
- * may "VOCAL" appear in their name, without prior written
- * permission of Vovida Networks, Inc.
- *
- * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
- * NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL VOVIDA
- * NETWORKS, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT DAMAGES
- * IN EXCESS OF $1,000, NOR FOR ANY INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
- * DAMAGE.
- *
- * ====================================================================
- *
- * This software consists of voluntary contributions made by Vovida
- * Networks, Inc. and many individuals on behalf of Vovida Networks,
- * Inc. For more information on Vovida Networks, Inc., please see
- * <http://www.vovida.org/>.
- *
- */
- static const char* const Condition_hxx_version =
- "$Id: Condition.hxx,v 1.1 2001/03/23 13:43:10 icahoon Exp $";
- #include "NonCopyable.hxx"
- #include "Mutex.hxx"
- /** Infrastructure common to VOCAL.
- */
- namespace Vocal
- {
- /** Infrastructure common to VOCAL to create and manage threads.
- */
- namespace Threads
- {
- /** Defines a simple conditional variable class which
- * allows threads to block until shared data changes state.
- * A VCondition must always be associated with a
- * VMutex to avoid the race condition where a thread prepares to
- * wait on a condition variable and another thread signals the
- * condition just before the first thread actually waits on it.
- */
- class Condition : public NonCopyable
- {
- public:
- /** Create an Condition object initialized with operating system
- * dependant defaults (if any).
- */
- Condition();
- /** Delete a Condition object
- */
- virtual ~Condition();
- /** Block on the condition. Will return after the relativeTime,
- * specified in millseconds, has passed. If set to -1, the default,
- * it will wait indefinately. Uses the specified mutex to synchronize
- * access to the condition. Returns 0, if successful, or an errorcode.
- */
- int wait (Mutex* mutex, int relativeTimeInMillis = -1);
- /** Block on the condition. Will return after the relativeTime,
- * specified in microseconds, has passed. If set to -1, the default,
- * it will wait indefinately. Uses the specified mutex to synchronize
- * access to the condition. Returns 0, if successful, or an errorcode.
- */
- int uwait(Mutex* mutex, int relativeTimeInMicros = -1);
- /** Signal one waiting thread.
- * Returns 0, if successful, or an errorcode.
- */
- int signal();
- /** Signal all waiting threads.
- * Returns 0, if successful, or an errorcode.
- */
- int broadcast();
-
- /** Returns the operating system dependent unique id of the condition.
- */
- const vcondition_t*
- getId() const;
- private:
- mutable vcondition_t myId;
- };
- } // namespace Threads
- } // namespace Vocal
- /** usleep() replacement.<br><br>
- *
- * This will not throw a SIGALRM.
- */
- void vusleep(unsigned long usec);
- #endif // !defined(VOCAL_CONDITION_HXX)