_mutex-pthread.h

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#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