126 lines
4 KiB
C
126 lines
4 KiB
C
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/*
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* pthread_setcancelstate.c
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*
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* Description:
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* POSIX thread functions related to thread cancellation.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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int
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pthread_setcancelstate (int state, int *oldstate)
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/*
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* ------------------------------------------------------
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* DOCPUBLIC
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* This function atomically sets the calling thread's
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* cancelability state to 'state' and returns the previous
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* cancelability state at the location referenced by
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* 'oldstate'
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*
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* PARAMETERS
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* state,
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* oldstate
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* PTHREAD_CANCEL_ENABLE
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* cancellation is enabled,
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*
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* PTHREAD_CANCEL_DISABLE
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* cancellation is disabled
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*
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*
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* DESCRIPTION
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* This function atomically sets the calling thread's
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* cancelability state to 'state' and returns the previous
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* cancelability state at the location referenced by
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* 'oldstate'.
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*
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* NOTES:
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* 1) Use to disable cancellation around 'atomic' code that
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* includes cancellation points
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*
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* COMPATIBILITY ADDITIONS
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* If 'oldstate' is NULL then the previous state is not returned
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* but the function still succeeds. (Solaris)
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*
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* RESULTS
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* 0 successfully set cancelability type,
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* EINVAL 'state' is invalid
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*
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* ------------------------------------------------------
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*/
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{
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ptw32_mcs_local_node_t stateLock;
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int result = 0;
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pthread_t self = pthread_self ();
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ptw32_thread_t * sp = (ptw32_thread_t *) self.p;
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if (sp == NULL
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|| (state != PTHREAD_CANCEL_ENABLE && state != PTHREAD_CANCEL_DISABLE))
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{
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return EINVAL;
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}
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/*
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* Lock for async-cancel safety.
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*/
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ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
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if (oldstate != NULL)
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{
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*oldstate = sp->cancelState;
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}
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sp->cancelState = state;
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/*
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* Check if there is a pending asynchronous cancel
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*/
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if (state == PTHREAD_CANCEL_ENABLE
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&& sp->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS
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&& WaitForSingleObject (sp->cancelEvent, 0) == WAIT_OBJECT_0)
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{
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sp->state = PThreadStateCanceling;
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sp->cancelState = PTHREAD_CANCEL_DISABLE;
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ResetEvent (sp->cancelEvent);
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ptw32_mcs_lock_release (&stateLock);
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ptw32_throw (PTW32_EPS_CANCEL);
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/* Never reached */
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}
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ptw32_mcs_lock_release (&stateLock);
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return (result);
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} /* pthread_setcancelstate */
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