150 lines
4.2 KiB
Groff
150 lines
4.2 KiB
Groff
.\" Copyright (c) 2004 Michael Telahun Makonnen
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 19, 2004
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.Dt PTHREAD_BARRIERATTR 3
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.Os
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.Sh NAME
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.Nm pthread_barrierattr_destroy , pthread_barrierattr_getpshared ,
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.Nm pthread_barrierattr_init , pthread_barrierattr_setpshared
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.Nd "manipulate a barrier attribute object"
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.Sh LIBRARY
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.Lb libpthread
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.Lb libthr
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.Sh SYNOPSIS
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.In pthread.h
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.Ft int
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.Fn pthread_barrierattr_destroy "pthread_barrierattr_t *attr"
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.Ft int
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.Fn pthread_barrierattr_getpshared "const pthread_barrierattr_t *attr" "int *pshared"
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.Ft int
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.Fn pthread_barrierattr_init "pthread_barrierattr_t *attr"
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.Ft int
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.Fn pthread_barrierattr_setpshared "pthread_barrierattr_t *attr" "int pshared"
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.Sh DESCRIPTION
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The
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.Fn pthread_barrierattr_init
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function will initialize
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.Fa attr
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with default attributes.
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The
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.Fn pthread_barrierattr_destroy
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function will destroy
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.Fa attr
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and release any resources that may have been allocated on its behalf.
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.Pp
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The
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.Fn pthread_barrierattr_getpshared
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function will put the value of the process-shared attribute from
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.Fa attr
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into the memory area pointed to by
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.Fa pshared .
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The
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.Fn pthread_barrierattr_setpshared
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function will set the process-shared attribute of
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.Fa attr
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to the value specified in
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.Fa pshared .
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The argument
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.Fa pshared
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may have one of the following values:
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.Bl -tag -width ".Dv PTHREAD_PROCESS_PRIVATE"
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.It Dv PTHREAD_PROCESS_PRIVATE
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The barrier object it is attached to may only be accessed by
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threads in the same process as the one that created the object.
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.It Dv PTHREAD_PROCESS_SHARED
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The barrier object it is attached to may be accessed by
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threads in processes other than the one that created the object.
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.El
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.Sh RETURN VALUES
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If successful, all these functions will return zero.
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Otherwise, an error number will be returned to indicate the error.
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.Pp
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None of these functions will return
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.Er EINTR .
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.Sh ERRORS
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The
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.Fn pthread_barrierattr_destroy ,
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.Fn pthread_barrierattr_getpshared
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and
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.Fn pthread_barrierattr_setpshared
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functions may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The value specified by
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.Fa attr
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is invalid.
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.El
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.Pp
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The
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.Fn pthread_barrierattr_init
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er ENOMEM
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Insufficient memory to initialize the barrier attribute object
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.Fa attr .
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.El
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.Pp
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The
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.Fn pthread_barrierattr_setpshared
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The value specified in
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.Fa pshared
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is not one of the allowed values.
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.El
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.Sh SEE ALSO
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.Xr pthread_barrier_destroy 3 ,
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.Xr pthread_barrier_init 3 ,
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.Xr pthread_barrier_wait 3
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.Sh HISTORY
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The
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.Fn pthread_barrierattr_*
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functions first appeared in
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.Lb libpthread
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in
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.Fx 5.2 ,
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and in
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.Lb libthr
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in
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.Fx 5.3 .
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.Sh BUGS
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The implementation of
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barriers
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does not fully conform to
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.St -p1003.2
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because the process-shared attribute is ignored in
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.Lb libthr ,
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and in
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.Lb libpthread ;
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if any value other than
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.Dv PTHREAD_PROCESSES_PRIVATE
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is specified in a call to
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.Fn pthread_barrierattr_setpshared ,
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it will return
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.Er EINVAL .
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