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	1	.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
	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	.\" 3. All advertising materials mentioning features or use of this software
	13	.\" must display the following acknowledgement:
	14	.\" This product includes software developed by John Birrell.
	15	.\" 4. Neither the name of the author nor the names of any co-contributors
	16	.\" may be used to endorse or promote products derived from this software
	17	.\" without specific prior written permission.
	18	.\"
	19	.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
	20	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	21	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	22	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	23	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	24	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	25	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	26	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	27	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	28	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	29	.\" SUCH DAMAGE.
	30	.\"
	31	.\" $FreeBSD$
	32	.\"
	33	.Dd April 4, 1996
	34	.Dt PTHREAD_KEY_DELETE 3
	35	.Os
	36	.Sh NAME
	37	.Nm pthread_key_delete
	38	.Nd delete a thread-specific data key
	39	.Sh SYNOPSIS
	40	.In pthread.h
	41	.Ft int
	42	.Fn pthread_key_delete "pthread_key_t key"
	43	.Sh DESCRIPTION
	44	The
	45	.Fn pthread_key_delete
	46	function deletes a thread-specific data key previously returned by
	47	.Fn pthread_key_create .
	48	The thread-specific data values associated with
	49	.Fa key
	50	need not be NULL at the time that
	51	.Fn pthread_key_delete
	52	is called.
	53	It is the responsibility of the application to free any
	54	application storage or perform any cleanup actions for data structures
	55	related to the deleted key or associated thread-specific data in any threads;
	56	this cleanup can be done either before or after
	57	.Fn pthread_key_delete
	58	is called.
	59	Any attempt to use
	60	.Fa key
	61	following the call to
	62	.Fn pthread_key_delete
	63	results in undefined behavior.
	64	.Pp
	65	The
	66	.Fn pthread_key_delete
	67	function is callable from within destructor functions.
	68	Destructor functions
	69	are not invoked by
	70	.Fn pthread_key_delete .
	71	Any destructor function that may have been associated with
	72	.Fa key
	73	will no longer be called upon thread exit.
	74	.Sh RETURN VALUES
	75	If successful, the
	76	.Fn pthread_key_delete
	77	function will return zero.
	78	Otherwise an error number will be returned to
	79	indicate the error.
	80	.Sh ERRORS
	81	The
	82	.Fn pthread_key_delete
	83	function will fail if:
	84	.Bl -tag -width Er
	85	.It Bq Er EINVAL
	86	The
	87	.Fa key
	88	value is invalid.
	89	.El
	90	.Sh SEE ALSO
	91	.Xr pthread_getspecific 3 ,
	92	.Xr pthread_key_create 3 ,
	93	.Xr pthread_setspecific 3
	94	.Sh STANDARDS
	95	The
	96	.Fn pthread_key_delete
	97	function conforms to
	98	.St -p1003.1-96 .