1 /* 2 * pthread_barrier_destroy.c 3 * 4 * Description: 5 * This translation unit implements barrier primitives. 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 int 41 pthread_barrier_destroy (pthread_barrier_t * barrier) 42 { 43 int result = 0; 44 pthread_barrier_t b; 45 ptw32_mcs_local_node_t node; 46 47 if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID) 48 { 49 return EINVAL; 50 } 51 52 if (0 != ptw32_mcs_lock_try_acquire(&(*barrier)->lock, &node)) 53 { 54 return EBUSY; 55 } 56 57 b = *barrier; 58 59 if (b->nCurrentBarrierHeight < b->nInitialBarrierHeight) 60 { 61 result = EBUSY; 62 } 63 else 64 { 65 if (0 == (result = sem_destroy (&(b->semBarrierBreeched)))) 66 { 67 *barrier = (pthread_barrier_t) PTW32_OBJECT_INVALID; 68 /* 69 * Release the lock before freeing b. 70 * 71 * FIXME: There may be successors which, when we release the lock, 72 * will be linked into b->lock, which will be corrupted at some 73 * point with undefined results for the application. To fix this 74 * will require changing pthread_barrier_t from a pointer to 75 * pthread_barrier_t_ to an instance. This is a change to the ABI 76 * and will require a major version number increment. 77 */ 78 ptw32_mcs_lock_release(&node); 79 (void) free (b); 80 return 0; 81 } 82 else 83 { 84 /* 85 * This should not ever be reached. 86 * Restore the barrier to working condition before returning. 87 */ 88 (void) sem_init (&(b->semBarrierBreeched), b->pshared, 0); 89 } 90 91 if (result != 0) 92 { 93 /* 94 * The barrier still exists and is valid 95 * in the event of any error above. 96 */ 97 result = EBUSY; 98 } 99 } 100 101 ptw32_mcs_lock_release(&node); 102 return (result); 103 } 104