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	1	.\" $FreeBSD$
	2	.Dd January 17, 1999
	3	.Dt PTHREAD_CANCEL 3
	4	.Os
	5	.Sh NAME
	6	.Nm pthread_cancel
	7	.Nd cancel execution of a thread
	8	.Sh SYNOPSIS
	9	.In pthread.h
	10	.Ft int
	11	.Fn pthread_cancel "pthread_t thread"
	12	.Sh DESCRIPTION
	13	The
	14	.Fn pthread_cancel
	15	function requests that
	16	.Fa thread
	17	be canceled.
	18	The target thread's cancelability state and type determines
	19	when the cancellation takes effect.
	20	When the cancellation is acted on,
	21	the cancellation cleanup handlers for
	22	.Fa thread
	23	are called.
	24	When the last cancellation cleanup handler returns,
	25	the thread-specific data destructor functions will be called for
	26	.Fa thread .
	27	When the last destructor function returns,
	28	.Fa thread
	29	will be terminated.
	30	.Pp
	31	The cancellation processing in the target thread runs asynchronously with
	32	respect to the calling thread returning from
	33	.Fn pthread_cancel .
	34	.Pp
	35	A status of
	36	.Dv PTHREAD_CANCELED
	37	is made available to any threads joining with the target.
	38	The symbolic
	39	constant
	40	.Dv PTHREAD_CANCELED
	41	expands to a constant expression of type
	42	.Ft "(void *)" ,
	43	whose value matches no pointer to an object in memory nor the value
	44	.Dv NULL .
	45	.Sh RETURN VALUES
	46	If successful, the
	47	.Fn pthread_cancel
	48	functions will return zero.
	49	Otherwise an error number will be returned to
	50	indicate the error.
	51	.Sh ERRORS
	52	The
	53	.Fn pthread_cancel
	54	function will fail if:
	55	.Bl -tag -width Er
	56	.It Bq Er ESRCH
	57	No thread could be found corresponding to that specified by the given
	58	thread ID.
	59	.El
	60	.Sh SEE ALSO
	61	.Xr pthread_cleanup_pop 3 ,
	62	.Xr pthread_cleanup_push 3 ,
	63	.Xr pthread_exit 3 ,
	64	.Xr pthread_join 3 ,
	65	.Xr pthread_setcancelstate 3 ,
	66	.Xr pthread_setcanceltype 3 ,
	67	.Xr pthread_testcancel 3
	68	.Sh STANDARDS
	69	The
	70	.Fn pthread_cancel
	71	function conforms to
	72	.St -p1003.1-96 .
	73	.Sh AUTHORS
	74	This manual page was written by
	75	.An David Leonard Aq Mt d@openbsd.org
	76	for the
	77	.Ox
	78	implementation of
	79	.Fn pthread_cancel .