mutex.cxx

Vovida 社区开源的 SIP 协议源码

/* ====================================================================
 * 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
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 * 
 * 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.
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 * 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 [e-mail].
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 * 4. Products derived from this software may not be called "VOCAL", nor
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 *    permission of Vovida Networks, Inc.
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 * ====================================================================
 * 
 * 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
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static const char* const Mutex_cxx_Version =
    "$Id: Mutex.cxx,v 1.3 2002/11/09 01:53:00 derekm Exp $";


#include "global.h"
#include "Mutex.hxx"
#include <cassert>
#include <cerrno>


using Vocal::Threads::Mutex;
using Vocal::ReturnCode;
using Vocal::SUCCESS;

static vmutex_t local;

static
void safe()
{
   vmutex_init(&local);
}

Mutex::Mutex()
{
   static pthread_once_t initialized = PTHREAD_ONCE_INIT;
   pthread_once(&initialized, safe);
   
   vmutex_lock(&local);   
   ReturnCode  rc = vmutex_init(&myId);
   assert( rc != EINVAL);
   assert( rc != EBUSY);
   assert( rc != ENOMEM);
   assert( rc != EAGAIN);
   
   assert( rc == SUCCESS );
   vmutex_unlock(&local);   
}

Mutex::~Mutex ()
{
    ReturnCode  rc = vmutex_destroy(&myId);
    assert( rc != EBUSY );  // currently locked 
    assert( rc == SUCCESS );
}


void
Mutex::lock()
{
    ReturnCode  rc = vmutex_lock(&myId);
    assert( rc != EINVAL );
    assert( rc != EDEADLK );
    assert( rc == SUCCESS );
}


void
Mutex::unlock()
{
    ReturnCode  rc = vmutex_unlock(&myId);
    assert( rc != EINVAL );
    assert( rc != EPERM );
    assert( rc == SUCCESS );
}


vmutex_t *
Mutex::getId() const
{
    return ( &myId );
}