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119 lines
3.6 KiB
Groff
119 lines
3.6 KiB
Groff
.\" Copyright (c) 2002,2003 Alexey Zelkin <phantom@FreeBSD.org>
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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 January 31, 2003
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.Dt PTHREAD_ATTR_GET_NP 3
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.Os
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.Sh NAME
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.Nm pthread_attr_get_np
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.Nd get attributes of existent thread
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.Sh LIBRARY
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.Lb libc_r
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.Lb libpthread
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.Lb libthr
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.Sh SYNOPSIS
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.In pthread_np.h
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.Ft int
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.Fn pthread_attr_get_np "pthread_t pid" "pthread_attr_t *dst"
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.Sh DESCRIPTION
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The
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.Fn pthread_attr_get_np
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function is used to get existent thread's attributes.
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Most fields of
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.Vt pthread_attr_t
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structure are exact values of attributes provided at thread creation
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time (as parameter to
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.Xr pthread_create 3
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function), except for the stack address.
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.Pp
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Value returned as
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.Fa dst
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is supposed to be used in conjunction with
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.Fn pthread_attr_get*
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functions to retrieve individual values from
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.Vt pthread_attr_t
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structure.
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Parameter
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.Fa dst
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should point to allocated memory area big enough to fit this structure.
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.Pp
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It is HIGHLY RECOMMENDED to use
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.Xr pthread_attr_init 3
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function to allocate attribute storage.
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.Sh IMPLEMENTATION NOTES
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The
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.Fn pthread_attr_get_np
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function will always return a pointer to the thread's real stack address,
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regardless of its value in the original attributes structure.
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.Sh EXAMPLES
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.Bd -literal
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size_t
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my_thread_stack_size(pthread_t pid)
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{
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pthread_attr_t attr;
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size_t size;
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pthread_attr_init(&attr);
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pthread_attr_get_np(pid, &attr);
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pthread_attr_getstacksize(&attr, &size);
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pthread_attr_destroy(&attr);
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return(size);
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}
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.Ed
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.Sh RETURN VALUES
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If successful,
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.Fn pthread_attr_get_np
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function returns 0.
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Otherwise, an error number is returned to indicate the error.
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.Sh ERRORS
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The
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.Fn pthread_attr_get_np
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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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Invalid value for one of given parameters.
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.It Bq Er ESRC
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No thread could be found corresponding to that specified by the given
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thread ID.
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.El
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.Sh SEE ALSO
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.Xr pthread_attr_destroy 3 ,
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.Xr pthread_attr_getdetachstate 3 ,
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.Xr pthread_attr_getinheritsched 3 ,
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.Xr pthread_attr_getschedparam 3 ,
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.Xr pthread_attr_getschedpolicy 3 ,
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.Xr pthread_attr_getscope 3 ,
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.Xr pthread_attr_getstack 3 ,
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.Xr pthread_attr_getstackaddr 3 ,
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.Xr pthread_attr_getstacksize 3 ,
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.Xr pthread_attr_init 3
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.Sh AUTHORS
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The
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.Fn pthread_attr_get_np
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function and this manual page were written by
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.An Alexey Zelkin
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.Aq phantom@FreeBSD.org .
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