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\" $FreeBSD: src/lib/libpthread/man/pthread_cancel.3,v 1.7 2002/09/16 19:29:28 mini Exp $
Dd July 9, 2010
Dt PTHREAD_CANCEL 3
Os
Sh NAME
Nm pthread_cancel
Nd cancel execution of a thread
Sh LIBRARY
Lb libpthread
Sh SYNOPSIS
In pthread.h
Ft int
Fn pthread_cancel "pthread_t thread"
Sh DESCRIPTION
The
Fn pthread_cancel
function requests that
Fa thread
be canceled.
The target thread's cancelability state and type determines
whether and when the target thread reacts to the cancellation request.
Bl -enum -offset 2n
It
The cancelability
Em state
of a thread is determined by the
Xr pthread_setcancelstate 3
function.
The state can be either:
Bl -bullet -offset 2n
It
Dv PTHREAD_CANCEL_ENABLE :
the cancelability type determines when the actual cancellation occurs.
This is the default.
It
Dv PTHREAD_CANCEL_DISABLE :
the request from
Fn pthread_cancel
remains queued until the cancellation is enabled by the thread.
El
It
The cancellation
Em type
of a thread is determined by the
Xr pthread_setcanceltype 3
function.
The type can be either:
Bl -bullet -offset 2n
It
Dv PTHREAD_CANCEL_DEFERRED :
the cancellation will be delayed until the thread calls
a function that is a cancellation point.
This is the default.
The available cancellation points are listed in
Xr pthread_setcanceltype 3 .
It
Dv PTHREAD_CANCEL_ASYNCHRONOUS :
the thread can be canceled at any time.
El
El
Pp
When the thread reacts to the cancellation request, the following occur:
Bl -enum -offset 2n
It
The cancellation cleanup handlers for the thread are called; see
Xr pthread_cleanup_push 3 .
It
When the last cancellation cleanup handler returns,
the thread-specific data destructor functions will be called for the thread.
It
When the last destructor function returns, the thread will be terminated; see
Xr pthread_exit 3 .
El
Pp
The cancellation processing in the target thread runs asynchronously with
respect to the calling thread returning from
Fn pthread_cancel .
Pp
A status of
Dv PTHREAD_CANCELED
is made available to any threads joining with the target.
The symbolic
constant
Dv PTHREAD_CANCELED
expands to a constant expression of type
Ft (void *) ,
whose value matches no pointer to an object in memory nor the value
Dv NULL .
Sh RETURN VALUES
If successful,  the
Fn pthread_cancel
functions will return zero.
Otherwise an error number will be returned to
indicate the error.
Sh ERRORS
The
Fn pthread_cancel
function may fail if:
Bl -tag -width Er
It Bq Er ESRCH
No thread could be found corresponding to that specified by the given
thread ID.
El
Sh SEE ALSO
Xr pthread_cleanup_pop 3 ,
Xr pthread_join 3 ,
Xr pthread_testcancel 3
Sh STANDARDS
The function conforms to
St -p1003.1-2001 .

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