/sys$common/syshlp/helplib.hlb DCE_THREADS, Application Routines, pthread_mutex_init  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  NAME

      pthread_mutex_init - Creates a mutex

  SYNOPSIS

      #include <pthread.h>

      int pthread_mutex_init( pthread_mutex_t     *mutex,
                              pthread_mutexattr_t attr );

  PARAMETERS

      mutex                Mutex that is created.

      attr                 Attributes object that defines the
                           characteristics of the created mutex.
                           If you specify pthread_mutexattr_default,
                           default attributes are used.

  DESCRIPTION

  The pthread_mutex_init() routine creates a mutex and initializes it to
  the unlocked state.  If the thread that called this routine terminates,
  the created mutex is not automatically deallocated, because it is con-
  sidered shared among multiple threads.

  RETURN VALUES

  If an error condition occurs, this routine returns -1, the mutex is not
  initialized, the contents of mutex are undefined, and errno may be set
  to one of the following values:

    Return   Error      Description
    __________________________________________________________
     0                  Successful completion.

    -1      [EAGAIN]    The system lacks the necessary resources to
                        initialize another mutex.

    -1      [ENOMEM]    Insufficient memory exists to initialize the
                        mutex.

  RELATED INFORMATION

      FUNCTIONS:  pthread_mutexattr_create
                  pthread_mutexattr_getkind_np
                  pthread_mutexattr_setkind_np
                  pthread_mutex_lock
                  pthread_mutex_trylock
                  pthread_mutex_unlock