1996-08-20 08:22:01 +00:00
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.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by John Birrell.
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.\" 4. Neither the name of the author nor the names of any co-contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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 REGENTS 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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.Dd April 4, 1996
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.Dt PTHREAD_SETSPECIFIC 3
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.Os BSD 4
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.Sh NAME
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.Nm pthread_setspecific
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.Nd set a thread-specific data value
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.Sh SYNOPSIS
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.Fd #include <pthread.h>
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.Ft int
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.Fn pthread_setspecific "pthread_key_t key" "const void *value"
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.Sh DESCRIPTION
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The
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.Fn pthread_setspecific
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function associates a thread-specific value with a
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.Fa key
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obtained via a previous call to
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.Fn pthread_key_create .
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Different threads man bind different values to the same key. These values are
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typically pointers to blocks of dynamically allocated memory that have been
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reserved for use by the calling thread.
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.Pp
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The effect of calling
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.Fn pthread_setspecific
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with a key value not obtained from
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.Fn pthread_key_create
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or after
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.Fa key
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has been deleted with
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.Fn pthread_key_delete
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is undefined.
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.Pp
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.Fn pthread_setspecific
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may be called from a thread-specific data destructor function, however this
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may result in lost storage or infinite loops.
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.Sh RETURN VALUES
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If successful, the
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.Fn pthread_setspecific
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function will return zero. Otherwise an error number will be returned to
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indicate the error.
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.Sh ERRORS
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.Fn pthread_setspecific
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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 exists to associate the value with the
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.Fa key .
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.It Bq Er EINVAL
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The
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.Fa key
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value is invalid.
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.El
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.Pp
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.Sh SEE ALSO
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1997-01-20 23:23:22 +00:00
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.Xr pthread_getspecific 3 ,
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1996-08-20 08:22:01 +00:00
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.Xr pthread_key_create 3 ,
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1997-01-20 23:23:22 +00:00
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.Xr pthread_key_delete 3
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1996-08-20 08:22:01 +00:00
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.Sh STANDARDS
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.Fn pthread_setspecific
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is expected to conform to IEEE
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.Pq Dq Tn POSIX
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Std 1003.1c when it is published.
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