.\" $OpenBSD: pthread_barrier_init.3,v 1.4 2020/04/06 00:01:08 pirofti Exp $ .\" .\" Copyright (c) 2012 Paul Irofti .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" .\" .Dd $Mdocdate: April 6 2020 $ .Dt PTHREAD_BARRIER_INIT 3 .Os .Sh NAME .Nm pthread_barrier_init , .Nm pthread_barrier_destroy .Nd initialize and destroy a barrier object .Sh SYNOPSIS .In pthread.h .Ft int .Fn pthread_barrier_init "pthread_barrier_t *barrier" "pthread_barrierattr_t *attr" "unsigned int count" .Ft int .Fn pthread_barrier_destroy "pthread_barrier_t *barrier" .Sh DESCRIPTION The .Fn pthread_barrier_init function creates a new barrier object, with attributes specified with .Fa attr and with a threshold specified with .Fa count . If .Fa attr is .Dv NULL the default attributes are used. The .Fa count argument is later used by the .Fn pthread_barrier_wait function to check if the required number of threads reached the barrier. .Pp The .Fn pthread_barrier_destroy function frees the resources allocated for .Fa barrier . .Sh RETURN VALUES If successful, .Fn pthread_barrier_init and .Fn pthread_barrier_destroy return zero; otherwise an error number is returned to indicate the error. .Sh ERRORS .Fn pthread_barrier_init will fail if: .Bl -tag -width Er .It Bq Er EINVAL The value specified by .Fa barrier or .Fa attr is invalid. .It Bq Er ENOMEM The process cannot allocate enough memory to create another barrier object. .It Bq Er ENOTSUP The attributes specified by .Fa attr are not supported by the current implementation. .El .Pp .Fn pthread_barrier_destroy will fail if: .Bl -tag -width Er .It Bq Er EINVAL The value specified by .Fa barrier is invalid. .It Bq Er EBUSY There are still threads waiting on the barrier. .El .Sh SEE ALSO .Xr pthread_barrier_wait 3 , .Xr pthread_barrierattr_getpshared 3 , .Xr pthread_barrierattr_init 3 .Sh STANDARDS .Fn pthread_barrier_init and .Fn pthread_barrier_destroy conform to .St -p1003.1-2008 . .Sh BUGS Currently only private barriers are supported and the pshared attribute is always set that way. Any attempts to change that value will trigger .Er ENOTSUP .