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pthread_testcancel.c    104 lines (95 with data), 3.4 kB

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/*
* pthread_testcancel.c
*
* Description:
* POSIX thread functions related to thread cancellation.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
void
pthread_testcancel (void)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function creates a deferred cancellation point
* in the calling thread. The call has no effect if the
* current cancelability state is
* PTHREAD_CANCEL_DISABLE
*
* PARAMETERS
* N/A
*
*
* DESCRIPTION
* This function creates a deferred cancellation point
* in the calling thread. The call has no effect if the
* current cancelability state is
* PTHREAD_CANCEL_DISABLE
*
* NOTES:
* 1) Cancellation is asynchronous. Use pthread_join
* to wait for termination of thread if necessary
*
* RESULTS
* N/A
*
* ------------------------------------------------------
*/
{
ptw32_mcs_local_node_t stateLock;
pthread_t self = pthread_self ();
ptw32_thread_t * sp = (ptw32_thread_t *) self.p;
if (sp == NULL)
{
return;
}
/*
* Pthread_cancel() will have set sp->state to PThreadStateCancelPending
* and set an event, so no need to enter kernel space if
* sp->state != PThreadStateCancelPending - that only slows us down.
*/
if (sp->state != PThreadStateCancelPending)
{
return;
}
ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
if (sp->cancelState != PTHREAD_CANCEL_DISABLE)
{
ResetEvent(sp->cancelEvent);
sp->state = PThreadStateCanceling;
sp->cancelState = PTHREAD_CANCEL_DISABLE;
ptw32_mcs_lock_release (&stateLock);
ptw32_throw (PTW32_EPS_CANCEL);
/* Never returns here */
}
ptw32_mcs_lock_release (&stateLock);
} /* pthread_testcancel */