.\" $NetBSD: pthread_attr.3,v 1.4 2005/03/21 17:55:07 kleink Exp $ .\" .\" Copyright (c) 2002 The NetBSD Foundation, Inc. .\" All rights reserved. .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of The NetBSD Foundation nor the names of its .\" contributors may be used to endorse or promote products derived .\" from this software without specific prior written permission. .\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS .\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED .\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR .\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS .\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS .\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN .\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE .\" POSSIBILITY OF SUCH DAMAGE. .\" .\" Copyright (C) 2000 Jason Evans . .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice(s), this list of conditions and the following disclaimer as .\" the first lines of this file unmodified other than the possible .\" addition of one or more copyright notices. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice(s), this list of conditions and the following disclaimer in .\" the documentation and/or other materials provided with the .\" distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY .\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR .\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE .\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR .\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, .\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE .\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, .\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .\" $FreeBSD: src/lib/libpthread/man/pthread_attr.3,v 1.11 2002/09/16 19:29:28 mini Exp $ .Dd January 30, 2003 .Dt PTHREAD_ATTR 3 .Os .Sh NAME .Nm pthread_attr_init , .Nm pthread_attr_destroy , ./" .Nm pthread_attr_setstacksize , ./" .Nm pthread_attr_getstacksize , ./" .Nm pthread_attr_setguardsize , ./" .Nm pthread_attr_getguardsize , ./" .Nm pthread_attr_setstackaddr , ./" .Nm pthread_attr_getstackaddr , .Nm pthread_attr_setdetachstate , .Nm pthread_attr_getdetachstate , ./" .Nm pthread_attr_setinheritsched , ./" .Nm pthread_attr_getinheritsched , .Nm pthread_attr_setschedparam , .Nm pthread_attr_getschedparam ./" .Nm pthread_attr_setschedpolicy , ./" .Nm pthread_attr_getschedpolicy , ./" .Nm pthread_attr_setscope , ./" .Nm pthread_attr_getscope .Nd thread attribute operations .Sh LIBRARY .Lb libpthread .Sh SYNOPSIS .In pthread.h .Ft int .Fn pthread_attr_init "pthread_attr_t *attr" .Ft int .Fn pthread_attr_destroy "pthread_attr_t *attr" ./" .Ft int ./" .Fn pthread_attr_setstacksize "pthread_attr_t *attr" "size_t stacksize" ./" .Ft int ./" .Fn pthread_attr_getstacksize "const pthread_attr_t * restrict attr" "size_t * restrict stacksize" ./" .Ft int ./" .Fn pthread_attr_setguardsize "pthread_attr_t *attr" "size_t guardsize" ./" .Ft int ./" .Fn pthread_attr_getguardsize "const pthread_attr_t * restrict attr" "size_t * restrict guardsize" ./" .Ft int ./" .Fn pthread_attr_setstackaddr "pthread_attr_t *attr" "void *stackaddr" ./" .Ft int ./" .Fn pthread_attr_getstackaddr "const pthread_attr_t * restrict attr" "void ** restrict stackaddr" .Ft int .Fn pthread_attr_setdetachstate "pthread_attr_t *attr" "int detachstate" .Ft int .Fn pthread_attr_getdetachstate "const pthread_attr_t *attr" "int *detachstate" ./" .Ft int ./" .Fn pthread_attr_setinheritsched "pthread_attr_t *attr" "int inheritsched" ./" .Ft int ./" .Fn pthread_attr_getinheritsched "const pthread_attr_t * restrict attr" "int * restrict inheritsched" .Ft int .Fn pthread_attr_setschedparam "pthread_attr_t * restrict attr" "const struct sched_param * restrict param" .Ft int .Fn pthread_attr_getschedparam "const pthread_attr_t * restrict attr" "struct sched_param * restrict param" ./" .Ft int ./" .Fn pthread_attr_setschedpolicy "pthread_attr_t *attr" "int policy" ./" .Ft int ./" .Fn pthread_attr_getschedpolicy "const pthread_attr_t * restrict attr" "int * restrict policy" ./" .Ft int ./" .Fn pthread_attr_setscope "pthread_attr_t *attr" "int contentionscope" ./" .Ft int ./" .Fn pthread_attr_getscope "const pthread_attr_t * restrict attr" "int * restrict contentionscope" .Sh DESCRIPTION Thread attributes are used to specify parameters to .Fn pthread_create . One attribute object can be used in multiple calls to .Fn pthread_create , with or without modifications between calls. .Pp The .Fn pthread_attr_init function initializes .Fa attr with all the default thread attributes. .Pp The .Fn pthread_attr_destroy function destroys .Fa attr . .Pp The .Fn pthread_attr_set* functions set the attribute that corresponds to each function name. .Pp The .Fn pthread_attr_get* functions copy the value of the attribute that corresponds to each function name to the location pointed to by the second function parameter. .Sh RETURN VALUES If successful, these functions return 0. Otherwise, an error number is returned to indicate the error. .Sh ERRORS .Fn pthread_attr_init shall fail if: .Bl -tag -width Er .It Bq Er ENOMEM Out of memory. .El .Pp .Fn pthread_attr_destroy may fail if: .Bl -tag -width Er .It Bq Er EINVAL The value specified by .Fa attr is invalid. .El .Pp .\" .Fn pthread_attr_setstacksize .\" may fail if: .\" .Bl -tag -width Er .\" .It Bq Er EINVAL .\" .Fa stacksize .\" is less than .\" .Dv PTHREAD_STACK_MIN . .\" .El .\" .Pp .Fn pthread_attr_setdetachstate shall fail if: .Bl -tag -width Er .It Bq Er EINVAL The value specified by .Fa detachstate is invalid. .El .Pp .\" Fn pthread_attr_setinheritsched .\" may fail if: .\" .Bl -tag -width Er .\" .It Bq Er EINVAL .\" Invalid value for .\" .Fa attr . .\" .El .\" .Pp .Fn pthread_attr_setschedparam may fail if: .Bl -tag -width Er .It Bq Er EINVAL The value specified by .Fa attr is invalid. .It Bq Er ENOTSUP The value specified by .Fa param is invalid. .El .Pp .\" .Fn pthread_attr_setschedpolicy .\" may fail if: .\" .Bl -tag -width Er .\" .It Bq Er EINVAL .\" Invalid value for .\" .Fa attr . .\" .It Bq Er ENOTSUP .\" Invalid or unsupported value for .\" .Fa policy . .\" .El .\" .Pp .\" .Fn pthread_attr_setscope .\" may fail if: .\" .Bl -tag -width Er .\" .It Bq Er EINVAL .\" Invalid value for .\" .Fa attr . .\" .It Bq Er ENOTSUP .\" Invalid or unsupported value for .\" .Fa contentionscope . .\" .El .Sh SEE ALSO .Xr pthread_create 3 .Sh STANDARDS .Fn pthread_attr_init , .Fn pthread_attr_destroy , .\" .Fn pthread_attr_setstacksize , .\" .Fn pthread_attr_getstacksize , .\" .Fn pthread_attr_setstackaddr , .\" .Fn pthread_attr_getstackaddr , .Fn pthread_attr_setdetachstate , .Fn pthread_attr_getdetachstate , .\" .Fn pthread_attr_setinheritsched , .\" .Fn pthread_attr_getinheritsched , .\" .Fn pthread_attr_setschedparam , .Fn pthread_attr_setschedparam , and .Fn pthread_attr_getschedparam .\" .Fn pthread_attr_setschedpolicy , .\" .Fn pthread_attr_getschedpolicy , .\" .Fn pthread_attr_setscope , .\" and .\" .Fn pthread_attr_getscope conform to .St -p1003.1-96 .