1 /* 2 * pthread_testcancel.c 3 * 4 * Description: 5 * POSIX thread functions related to thread cancellation. 6 * 7 * -------------------------------------------------------------------------- 8 * 9 * Pthreads-win32 - POSIX Threads Library for Win32 10 * Copyright(C) 1998 John E. Bossom 11 * Copyright(C) 1999,2005 Pthreads-win32 contributors 12 * 13 * Contact Email: rpj (at) callisto.canberra.edu.au 14 * 15 * The current list of contributors is contained 16 * in the file CONTRIBUTORS included with the source 17 * code distribution. The list can also be seen at the 18 * following World Wide Web location: 19 * http://sources.redhat.com/pthreads-win32/contributors.html 20 * 21 * This library is free software; you can redistribute it and/or 22 * modify it under the terms of the GNU Lesser General Public 23 * License as published by the Free Software Foundation; either 24 * version 2 of the License, or (at your option) any later version. 25 * 26 * This library is distributed in the hope that it will be useful, 27 * but WITHOUT ANY WARRANTY; without even the implied warranty of 28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 29 * Lesser General Public License for more details. 30 * 31 * You should have received a copy of the GNU Lesser General Public 32 * License along with this library in the file COPYING.LIB; 33 * if not, write to the Free Software Foundation, Inc., 34 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 35 */ 36 37 #include "pthread.h" 38 #include "implement.h" 39 40 41 void 42 pthread_testcancel (void) 43 /* 44 * ------------------------------------------------------ 45 * DOCPUBLIC 46 * This function creates a deferred cancellation point 47 * in the calling thread. The call has no effect if the 48 * current cancelability state is 49 * PTHREAD_CANCEL_DISABLE 50 * 51 * PARAMETERS 52 * N/A 53 * 54 * 55 * DESCRIPTION 56 * This function creates a deferred cancellation point 57 * in the calling thread. The call has no effect if the 58 * current cancelability state is 59 * PTHREAD_CANCEL_DISABLE 60 * 61 * NOTES: 62 * 1) Cancellation is asynchronous. Use pthread_join 63 * to wait for termination of thread if necessary 64 * 65 * RESULTS 66 * N/A 67 * 68 * ------------------------------------------------------ 69 */ 70 { 71 ptw32_mcs_local_node_t stateLock; 72 pthread_t self = pthread_self (); 73 ptw32_thread_t * sp = (ptw32_thread_t *) self.p; 74 75 if (sp == NULL) 76 { 77 return; 78 } 79 80 /* 81 * Pthread_cancel() will have set sp->state to PThreadStateCancelPending 82 * and set an event, so no need to enter kernel space if 83 * sp->state != PThreadStateCancelPending - that only slows us down. 84 */ 85 if (sp->state != PThreadStateCancelPending) 86 { 87 return; 88 } 89 90 ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock); 91 92 if (sp->cancelState != PTHREAD_CANCEL_DISABLE) 93 { 94 ResetEvent(sp->cancelEvent); 95 sp->state = PThreadStateCanceling; 96 sp->cancelState = PTHREAD_CANCEL_DISABLE; 97 ptw32_mcs_lock_release (&stateLock); 98 ptw32_throw (PTW32_EPS_CANCEL); 99 /* Never returns here */ 100 } 101 102 ptw32_mcs_lock_release (&stateLock); 103 } /* pthread_testcancel */ 104
