Fifo.cc
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上传日期:2013-07-25
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- /* ====================================================================
- * 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 $1,000, NOR FOR ANY INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
- * DAMAGE.
- *
- * ====================================================================
- *
- * This software consists of voluntary contributions made by Vovida
- * Networks, Inc. and many individuals on behalf of Vovida Networks,
- * Inc. For more information on Vovida Networks, Inc., please see
- * <http://www.vovida.org/>.
- *
- */
- static const char* const Fifo_cc_Version =
- "$Id: Fifo.cc,v 1.10 2001/04/03 07:51:08 icahoon Exp $";
- #include <cerrno>
- #include "VLog.hxx"
- using Vocal::Fifo;
- using Vocal::Logging::VLog;
- template <class Msg>
- Fifo<Msg>::Fifo()
- {
- }
- template <class Msg>
- Fifo<Msg>::~Fifo()
- {
- }
- template <class Msg>
- void
- Fifo<Msg>::wakeup()
- throw ( VException )
- {
- // Tell any waiting threads the FIFO is no longer empty
- //
- int error = myCondition.signal();
- assert( !error );
- }
- template <class Msg>
- int
- Fifo<Msg>::wait(milliseconds_t relativeTimeout)
- throw ( VException )
- {
- const string fn("Fifo::wait");
- VLog log(fn);
- // This will unlock the object's mutex, wait for a condition's signal,
- // and relock.
- //
- int error = myCondition.wait(&myMutex, relativeTimeout);
- if ( error != 0 )
- {
- // If we have been awaken due to a unix signal, i.e. SIGTERM,
- // or a timeout return 0 to indicate no activity.
- //
- if ( error == EINTR || error == ETIMEDOUT )
- {
- return ( 0 );
- }
- // Defensive, shouldn't ever get here.
- //
- else
- {
- VERR(log) << fn << ": error = " << strerror(error)
- << " (" << error << ")" << VERR_END(log);
- assert( 0 );
- }
- }
- return ( myFifo.size() );
- }