include/rw/_mutex-pthread.h

/***************************************************************************
 *
 * _mutex-pthread.h - definitions of classes for thread safety
 *                    using POSIX threads
 *
 * This is an internal header file used to implement the C++ Standard
 * Library. It should never be #included directly by a program.
 *
 * $Id$
 *
 ***************************************************************************
 *
 * Licensed to the Apache Software  Foundation (ASF) under one or more
 * contributor  license agreements.  See  the NOTICE  file distributed
 * with  this  work  for  additional information  regarding  copyright
 * ownership.   The ASF  licenses this  file to  you under  the Apache
 * License, Version  2.0 (the  "License"); you may  not use  this file
 * except in  compliance with the License.   You may obtain  a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the  License is distributed on an  "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
 * implied.   See  the License  for  the  specific language  governing
 * permissions and limitations under the License.
 *
 * Copyright 1994-2008 Rogue Wave Software, Inc.
 * 
 **************************************************************************/

#if    defined (_RWSTD_EDG_ECCP) && defined (_RWSTD_OS_LINUX) \
    && defined (_RWSTD_NO_LONG_LONG)
   // disable error #450-D: the type "long long" is nonstandard
   // when using the vanilla EDG eccp in strict mode (i.e., w/o
   // long long support)
#  pragma diag_suppress 450
#endif   // EDG eccp on Linux

// LinuxThreads man page:
//   "Variables of type pthread_mutex_t can also be initialized
//    statically, using the constants  PTHREAD_MUTEX_INITIALIZER
//    (for fast mutexes), PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
//    (for recursive mutexes), and PTHREAD_ERRORCHECK_MUTEX_INI-
//    TIALIZER_NP (for error checking mutexes)."
//    ...
//    "Attempting to initialize an already initialized mutex results
//    in undefined behavior."

#include <pthread.h>

#define _RWSTD_MUTEX_INIT(mutex)      pthread_mutex_init (&mutex, 0)
#define _RWSTD_MUTEX_DESTROY(mutex)   pthread_mutex_destroy (&mutex)
#define _RWSTD_MUTEX_LOCK(mutex)      pthread_mutex_lock (&mutex)
#define _RWSTD_MUTEX_UNLOCK(mutex)    pthread_mutex_unlock (&mutex)
#define _RWSTD_MUTEX_T                pthread_mutex_t

#if defined (__GNUG__) && defined (__osf__)
   // prevent g++ warnings about missing initializers
   // see <pthread.h> for explanation of _PTHREAD_NOMETER_STATIC
#  ifndef _PTHREAD_NOMETER_STATIC
#    define _RWSTD_MUTEX_INITIALIZER \
            { _PTHREAD_MSTATE_SLOW, _PTHREAD_MVALID | _PTHREAD_MVF_STA, \
              0, 0, 0, 0, 0, 0 }
#  else   // if defined (_PTHREAD_NOMETER_STATIC)
#    define _RWSTD_MUTEX_INITIALIZER
            { 0, _PTHREAD_MVALID | _PTHREAD_MVF_STA, 0, 0, 0, 0, 0, 0 }
#  endif   // _PTHREAD_NOMETER_STATIC
#elif defined (__GNUG__) && defined (__sgi__)
   // prevent g++ warnings about a partly bracketed initializer
#  define _RWSTD_MUTEX_INITIALIZER { PTHREAD_MUTEX_INITIALIZER }
#else
#  define _RWSTD_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
#endif