1.\" Copyright (c) 2002,2003 Alexey Zelkin <phantom@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd January 31, 2003 28.Dt PTHREAD_ATTR_GET_NP 3 29.Os 30.Sh NAME 31.Nm pthread_attr_get_np 32.Nd get attributes of existent thread 33.Sh LIBRARY 34.Lb libc_r 35.Lb libpthread 36.Lb libthr 37.Sh SYNOPSIS 38.In pthread_np.h 39.Ft int 40.Fn pthread_attr_get_np "pthread_t pid" "pthread_attr_t *dst" 41.Sh DESCRIPTION 42The 43.Fn pthread_attr_get_np 44function is used to get existent thread's attributes. 45Most fields of 46.Vt pthread_attr_t 47structure are exact values of attributes provided at thread creation 48time (as parameter to 49.Xr pthread_create 3 50function), except for the stack address. 51.Pp 52Value returned as 53.Fa dst 54is supposed to be used in conjunction with 55.Fn pthread_attr_get* 56functions to retrieve individual values from 57.Vt pthread_attr_t 58structure. 59Parameter 60.Fa dst 61should point to allocated memory area big enough to fit this structure. 62.Pp 63It is HIGHLY RECOMMENDED to use 64.Xr pthread_attr_init 3 65function to allocate attribute storage. 66.Sh IMPLEMENTATION NOTES 67The 68.Fn pthread_attr_get_np 69function will always return a pointer to the thread's real stack address, 70regardless of its value in the original attributes structure. 71.Sh EXAMPLES 72.Bd -literal 73size_t 74my_thread_stack_size(pthread_t pid) 75{ 76 pthread_attr_t attr; 77 size_t size; 78 79 pthread_attr_init(&attr); 80 pthread_attr_get_np(pid, &attr); 81 pthread_attr_getstacksize(&attr, &size); 82 pthread_attr_destroy(&attr); 83 return(size); 84} 85.Ed 86.Sh RETURN VALUES 87If successful, 88.Fn pthread_attr_get_np 89function returns 0. 90Otherwise, an error number is returned to indicate the error. 91.Sh ERRORS 92The 93.Fn pthread_attr_get_np 94function will fail if: 95.Bl -tag -width Er 96.It Bq Er EINVAL 97Invalid value for one of given parameters. 98.It Bq Er ESRC 99No thread could be found corresponding to that specified by the given 100thread ID. 101.El 102.Sh SEE ALSO 103.Xr pthread_attr_destroy 3 , 104.Xr pthread_attr_getdetachstate 3 , 105.Xr pthread_attr_getinheritsched 3 , 106.Xr pthread_attr_getschedparam 3 , 107.Xr pthread_attr_getschedpolicy 3 , 108.Xr pthread_attr_getscope 3 , 109.Xr pthread_attr_getstack 3 , 110.Xr pthread_attr_getstackaddr 3 , 111.Xr pthread_attr_getstacksize 3 , 112.Xr pthread_attr_init 3 113.Sh AUTHORS 114The 115.Fn pthread_attr_get_np 116function and this manual page were written by 117.An Alexey Zelkin 118.Aq phantom@FreeBSD.org . 119