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pthread_barrierattr_init(3)

pthread_barrierattr_destroy, pthread_barrierattr_getpshared, pthread_barrierattr_init, pthread_barrierattr_setpshared -- manipulate a barrier attribute object

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)
     1:1 Threading Library (libthr, -lthr)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_barrierattr_destroy(pthread_barrierattr_t *attr);

     int
     pthread_barrierattr_getpshared(const pthread_barrierattr_t *attr,
	 int *pshared);

     int
     pthread_barrierattr_init(pthread_barrierattr_t *attr);

     int
     pthread_barrierattr_setpshared(pthread_barrierattr_t *attr, int pshared);

DESCRIPTION

     The pthread_barrierattr_init() function will initialize attr with default
     attributes.  The pthread_barrierattr_destroy() function will destroy attr
     and release any resources that may have been allocated on its behalf.

     The pthread_barrierattr_getpshared() function will put the value of the
     process-shared attribute from attr into the memory area pointed to by
     pshared.  The pthread_barrierattr_setpshared() function will set the
     process-shared attribute of attr to the value specified in pshared.  The
     argument pshared may have one of the following values:

     PTHREAD_PROCESS_PRIVATE  The barrier object it is attached to may only be
			      accessed by threads in the same process as the
			      one that created the object.

     PTHREAD_PROCESS_SHARED   The barrier object it is attached to may be
			      accessed by threads in processes other than the
			      one that created the object.

RETURN VALUES

     If successful, all these functions will return zero.  Otherwise, an error
     number will be returned to indicate the error.

     None of these functions will return EINTR.

ERRORS

     The pthread_barrierattr_destroy(), pthread_barrierattr_getpshared() and
     pthread_barrierattr_setpshared() functions may fail if:

     [EINVAL]		The value specified by attr is invalid.

     The pthread_barrierattr_init() function will fail if:

SEE ALSO

     pthread_barrier_destroy(3), pthread_barrier_init(3),
     pthread_barrier_wait(3)

HISTORY

     The pthread_barrierattr_*() functions first appeared in POSIX Threads
     Library (libpthread, -lpthread) in FreeBSD 5.2, and in 1:1 Threading
     Library (libthr, -lthr) in FreeBSD 5.3.

BUGS

     The implementation of barriers does not fully conform to IEEE Std 1003.2
     (``POSIX.2'') because the process-shared attribute is ignored in 1:1
     Threading Library (libthr, -lthr), and in POSIX Threads Library
     (libpthread, -lpthread); if any value other than
     PTHREAD_PROCESSES_PRIVATE is specified in a call to
     pthread_barrierattr_setpshared(), it will return EINVAL.

FreeBSD 5.4		       February 19, 2004		   FreeBSD 5.4

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