/* * pthread_setcancelstate.c * * Description: * POSIX thread functions related to thread cancellation. * * -------------------------------------------------------------------------- * *      Pthreads-win32 - POSIX Threads Library for Win32 *      Copyright(C) 1998 John E. Bossom *      Copyright(C) 1999,2003 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"intpthread_setcancelstate (int state, int *oldstate)     /*      * ------------------------------------------------------      * DOCPUBLIC      *      This function atomically sets the calling thread's      *      cancelability state to 'state' and returns the previous      *      cancelability state at the location referenced by      *      'oldstate'      *      * PARAMETERS      *      state,      *      oldstate      *              PTHREAD_CANCEL_ENABLE      *                      cancellation is enabled,      *      *              PTHREAD_CANCEL_DISABLE      *                      cancellation is disabled      *      *      * DESCRIPTION      *      This function atomically sets the calling thread's      *      cancelability state to 'state' and returns the previous      *      cancelability state at the location referenced by      *      'oldstate'.      *      *      NOTES:      *      1)      Use to disable cancellation around 'atomic' code that      *              includes cancellation points      *      * COMPATIBILITY ADDITIONS      *      If 'oldstate' is NULL then the previous state is not returned      *      but the function still succeeds. (Solaris)      *      * RESULTS      *              0               successfully set cancelability type,      *              EINVAL          'state' is invalid      *      * ------------------------------------------------------      */{  int result = 0;  pthread_t self = pthread_self();  if (self == NULL      || (state != PTHREAD_CANCEL_ENABLE          && state != PTHREAD_CANCEL_DISABLE))    {      return EINVAL;    }  /*   * Lock for async-cancel safety.   */  (void) pthread_mutex_lock(&self->cancelLock);  if (oldstate != NULL)    {      *oldstate = self->cancelState;    }  self->cancelState = state;  /*   * Check if there is a pending asynchronous cancel   */  if (state == PTHREAD_CANCEL_ENABLE      && self->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS      && WaitForSingleObject(self->cancelEvent, 0) == WAIT_OBJECT_0)    {      self->state = PThreadStateCanceling;      self->cancelState = PTHREAD_CANCEL_DISABLE;      ResetEvent(self->cancelEvent);      (void) pthread_mutex_unlock(&self->cancelLock);      ptw32_throw(PTW32_EPS_CANCEL);      /* Never reached */    }  (void) pthread_mutex_unlock(&self->cancelLock);  return (result);}                               /* pthread_setcancelstate */