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Diffstat (limited to 'pthreads/src/pthread_setcancelstate.c')
| -rw-r--r-- | pthreads/src/pthread_setcancelstate.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/pthreads/src/pthread_setcancelstate.c b/pthreads/src/pthread_setcancelstate.c new file mode 100644 index 0000000..bbcd624 --- /dev/null +++ b/pthreads/src/pthread_setcancelstate.c @@ -0,0 +1,125 @@ +/* + * 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) 1999,2005 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" + + +int +pthread_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 + * + * ------------------------------------------------------ + */ +{ + ptw32_mcs_local_node_t stateLock; + int result = 0; + pthread_t self = pthread_self (); + ptw32_thread_t * sp = (ptw32_thread_t *) self.p; + + if (sp == NULL + || (state != PTHREAD_CANCEL_ENABLE && state != PTHREAD_CANCEL_DISABLE)) + { + return EINVAL; + } + + /* + * Lock for async-cancel safety. + */ + ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock); + + if (oldstate != NULL) + { + *oldstate = sp->cancelState; + } + + sp->cancelState = state; + + /* + * Check if there is a pending asynchronous cancel + */ + if (state == PTHREAD_CANCEL_ENABLE + && sp->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS + && WaitForSingleObject (sp->cancelEvent, 0) == WAIT_OBJECT_0) + { + sp->state = PThreadStateCanceling; + sp->cancelState = PTHREAD_CANCEL_DISABLE; + ResetEvent (sp->cancelEvent); + ptw32_mcs_lock_release (&stateLock); + ptw32_throw (PTW32_EPS_CANCEL); + + /* Never reached */ + } + + ptw32_mcs_lock_release (&stateLock); + + return (result); + +} /* pthread_setcancelstate */ |