8a477638bd
pthread_setspecific(3) from a key destructor. Reviewed by: jhb Approved by: jmallett (mentor) MFC after: 3 days
102 lines
3.4 KiB
Groff
102 lines
3.4 KiB
Groff
.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
|
|
.\" 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by John Birrell.
|
|
.\" 4. Neither the name of the author nor the names of any co-contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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 REGENTS 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd April 4, 1996
|
|
.Dt PTHREAD_SETSPECIFIC 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm pthread_setspecific
|
|
.Nd set a thread-specific data value
|
|
.Sh LIBRARY
|
|
.Lb libpthread
|
|
.Sh SYNOPSIS
|
|
.In pthread.h
|
|
.Ft int
|
|
.Fn pthread_setspecific "pthread_key_t key" "const void *value"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn pthread_setspecific
|
|
function associates a thread-specific value with a
|
|
.Fa key
|
|
obtained via a previous call to
|
|
.Fn pthread_key_create .
|
|
Different threads can bind different values to the same key.
|
|
These values are
|
|
typically pointers to blocks of dynamically allocated memory that have been
|
|
reserved for use by the calling thread.
|
|
.Pp
|
|
The effect of calling
|
|
.Fn pthread_setspecific
|
|
with a key value not obtained from
|
|
.Fn pthread_key_create
|
|
or after
|
|
.Fa key
|
|
has been deleted with
|
|
.Fn pthread_key_delete
|
|
is undefined.
|
|
.Pp
|
|
The
|
|
.Fn pthread_setspecific
|
|
function may be called from a thread-specific data destructor function,
|
|
however this may result in lost storage or infinite loops if doing so
|
|
causes non-NULL key values to remain after
|
|
.Bq PTHREAD_DESTRUCTOR_ITERATIONS
|
|
iterations of destructor calls have been made.
|
|
.Sh RETURN VALUES
|
|
If successful, the
|
|
.Fn pthread_setspecific
|
|
function will return zero.
|
|
Otherwise an error number will be returned to
|
|
indicate the error.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn pthread_setspecific
|
|
function will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er ENOMEM
|
|
Insufficient memory exists to associate the value with the
|
|
.Fa key .
|
|
.It Bq Er EINVAL
|
|
The
|
|
.Fa key
|
|
value is invalid.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr pthread_getspecific 3 ,
|
|
.Xr pthread_key_create 3 ,
|
|
.Xr pthread_key_delete 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn pthread_setspecific
|
|
function conforms to
|
|
.St -p1003.1-96 .
|