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.Dd June 12, 2016
.Dt PTHREAD_BARRIERATTR 3
.Os
.Sh NAME
.Nm pthread_barrierattr_init ,
.Nm pthread_barrierattr_destroy ,
.Nm pthread_barrierattr_getpshared ,
.Nm pthread_barrierattr_setpshared
.Nd barrier attribute operations
.Sh LIBRARY
.Lb libpthread
.Sh SYNOPSIS
.In pthread.h
.Ft int
.Fn pthread_barrierattr_init "pthread_barrierattr_t *attr"
.Ft int
.Fn pthread_barrierattr_destroy "pthread_barrierattr_t *attr"
.Ft int
.Fn pthread_barrierattr_getpshared "const pthread_barrierattr_t * __restrict attr" "int * __restrict pshared"
.Ft int
.Fn pthread_barrierattr_setpshared "pthread_barrierattr_t * attr" "int pshared"
.Sh DESCRIPTION
Barrier attributes are used to specify parameters to be used with
.Xr pthread_barrier_init 3 .
One attribute object can be used in multiple calls to
.Fn pthread_barrier_init ,
with or without modifications between calls.
.Pp
The
.Fn pthread_barrierattr_init
function initializes
.Fa attr
with the default barrier attributes.
.Pp
The
.Fn pthread_barrierattr_destroy
function destroys
.Fa attr .
.Pp
The
.Fn pthread_barrierattr_getpshared
function shall obtain the value of the process-shared attribute
from the attributes object referenced by
.Fa attr .
.Pp
The
.Fn pthread_barrierattr_setpshared
function shall set the process-shared attribute in an initialized
attributes object referenced by
.Fa attr .
.Sh RETURN VALUES
If successful, these functions return 0.
Otherwise, an error number is returned to indicate the error.
.Sh ERRORS
No error codes are defined for
.Fn pthread_barrierattr_init .
.Pp
The
.Fn pthread_barrierattr_destroy
function may fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa attr
is invalid.
.El
.Pp
The
.Fn pthread_barrierattr_getpshared
and
.Fn pthread_barrierattr_setpshared
functions may fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa attr
is invalid.
.El
.Sh SEE ALSO
.Xr pthread_barrier_init 3
.Sh STANDARDS
These functions conform to
.St -p1003.1-2001 .
.Sh BUGS
The
.Fn pthread_barrierattr_getpshared
and
.Fn pthread_barrierattr_setpshared
functions are hidden by default since only thread shared attributes
are supported.