1999-11-28 05:38:13 +00:00
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.\" $FreeBSD$
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.Dd January 17, 1999
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.Dt PTHREAD_CANCEL 3
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.Os
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.Sh NAME
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.Nm pthread_cancel
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.Nd cancel execution of a thread
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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_cancel "pthread_t thread"
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.Sh DESCRIPTION
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The
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.Fn pthread_cancel
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function requests that
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.Fa thread
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be canceled. The target thread's cancelability state and type determines
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when the cancellation takes effect. When the cancellation is acted on,
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the cancellation cleanup handlers for
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.Fa thread
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are called. When the last cancellation cleanup handler returns,
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the thread-specific data destructor functions will be called for
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.Fa thread .
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When the last destructor function returns,
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.Fa thread
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will be terminated.
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.Pp
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The cancellation processing in the target thread runs asynchronously with
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respect to the calling thread returning from
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.Fn pthread_cancel .
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.Pp
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A status of
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.Dv PTHREAD_CANCELED
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is made available to any threads joining with the target. The symbolic
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constant
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.Dv PTHREAD_CANCELED
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expands to a constant expression of type
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.Ft "(void *)" ,
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whose value matches no pointer to an object in memory nor the value
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.Dv NULL .
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.Sh RETURN VALUES
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If successful, the
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.Fn pthread_cancel
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functions 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_cancel
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will fail if:
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.Bl -tag -width Er
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.It Bq Er ESRCH
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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_cleanup_pop 3 ,
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.Xr pthread_cleanup_push 3 ,
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.Xr pthread_exit 3 ,
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.Xr pthread_join 3 ,
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.Xr pthread_setcancelstate 3 ,
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.Xr pthread_setcanceltype 3 ,
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.Xr pthread_testcancel 3
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.Sh STANDARDS
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.Fn pthread_cancel
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conforms to ISO/IEC 9945-1 ANSI/IEEE
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.Pq Dq Tn POSIX
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Std 1003.1 Second Edition 1996-07-12.
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.Sh AUTHORS
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This man page was written by
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1999-12-17 14:48:00 +00:00
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.An David Leonard Aq d@openbsd.org
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for the
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.Ox
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implementation of
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.Fn pthread_cancel .
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