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.\"
.TH PTHREAD_CANCEL 3C "Nov 2, 2007"
.SH NAME
pthread_cancel \- cancel execution of a thread
.SH SYNOPSIS
.LP
.nf
cc -mt [ \fIflag\fR... ] \fIfile\fR... -lpthread [ \fIlibrary\fR... ]
#include <pthread.h>
\fBint\fR \fBpthread_cancel\fR(\fBpthread_t\fR \fItarget_thread\fR);
.fi
.SH DESCRIPTION
.sp
.LP
The \fBpthread_cancel()\fR function requests that \fItarget_thread\fR be
canceled.
.sp
.LP
By default, cancellation is deferred until \fItarget_thread\fR reaches a
cancellation point. See \fBcancellation\fR(5).
.sp
.LP
Cancellation cleanup handlers for \fItarget_thread\fR are called when the
cancellation is acted on. Upon return of the last cancellation cleanup handler,
the thread-specific data destructor functions are called for
\fItarget_thread\fR. \fItarget_thread\fR is terminated when the last destructor
function returns.
.sp
.LP
A thread acting on a cancellation request runs with all signals blocked. All
thread termination functions, including cancellation cleanup handlers and
thread-specific data destructor functions, are called with all signals blocked.
.sp
.LP
The cancellation processing in \fItarget_thread\fR runs asynchronously with
respect to the calling thread returning from \fBpthread_cancel()\fR.
.SH RETURN VALUES
.sp
.LP
If successful, the \fBpthread_cancel()\fR function returns \fB0\fR. Otherwise,
an error number is returned to indicate the error.
.SH ERRORS
.sp
.LP
The \fBpthread_cancel()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBESRCH\fR\fR
.ad
.RS 9n
No thread was found with an \fBID\fR corresponding to that specified by the
given thread \fBID,\fR \fItarget_thread\fR.
.RE
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp
.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE ATTRIBUTE VALUE
_
Interface Stability Committed
_
MT-Level MT-Safe
_
Standard See \fBstandards\fR(5).
.TE
.SH SEE ALSO
.sp
.LP
\fBpthread_cleanup_pop\fR(3C), \fBpthread_cleanup_push\fR(3C),
\fBpthread_cond_wait\fR(3C), \fBpthread_cond_timedwait\fR(3C),
\fBpthread_exit\fR(3C), \fBpthread_join\fR(3C),
\fBpthread_setcancelstate\fR(3C), \fBpthread_setcanceltype\fR(3C),
\fBpthread_testcancel\fR(3C), \fBsetjmp\fR(3C), \fBattributes\fR(5),
\fBcancellation\fR(5), \fBcondition\fR(5), \fBstandards\fR(5)
.SH NOTES
.sp
.LP
See \fBcancellation\fR(5) for a discussion of cancellation concepts.
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