15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * pthread_barrier_destroy.c 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Description: 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This translation unit implements barrier primitives. 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * -------------------------------------------------------------------------- 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Pthreads-win32 - POSIX Threads Library for Win32 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright(C) 1998 John E. Bossom 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright(C) 1999,2005 Pthreads-win32 contributors 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Contact Email: rpj@callisto.canberra.edu.au 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The current list of contributors is contained 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * in the file CONTRIBUTORS included with the source 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * code distribution. The list can also be seen at the 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * following World Wide Web location: 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * http://sources.redhat.com/pthreads-win32/contributors.html 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This library is free software; you can redistribute it and/or 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * modify it under the terms of the GNU Lesser General Public 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * License as published by the Free Software Foundation; either 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * version 2 of the License, or (at your option) any later version. 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This library is distributed in the hope that it will be useful, 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * but WITHOUT ANY WARRANTY; without even the implied warranty of 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Lesser General Public License for more details. 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * You should have received a copy of the GNU Lesser General Public 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * License along with this library in the file COPYING.LIB; 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * if not, write to the Free Software Foundation, Inc., 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "pthread.h" 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "implement.h" 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)pthread_barrier_destroy (pthread_barrier_t * barrier) 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int result = 0; 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) pthread_barrier_t b; 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptw32_mcs_local_node_t node; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return EINVAL; 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (0 != ptw32_mcs_lock_try_acquire(&(*barrier)->lock, &node)) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return EBUSY; 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) b = *barrier; 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (b->nCurrentBarrierHeight < b->nInitialBarrierHeight) 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result = EBUSY; 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (0 == (result = sem_destroy (&(b->semBarrierBreeched)))) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *barrier = (pthread_barrier_t) PTW32_OBJECT_INVALID; 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Release the lock before freeing b. 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * FIXME: There may be successors which, when we release the lock, 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * will be linked into b->lock, which will be corrupted at some 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * point with undefined results for the application. To fix this 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * will require changing pthread_barrier_t from a pointer to 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * pthread_barrier_t_ to an instance. This is a change to the ABI 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * and will require a major version number increment. 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptw32_mcs_lock_release(&node); 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (void) free (b); 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 0; 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This should not ever be reached. 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Restore the barrier to working condition before returning. 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (void) sem_init (&(b->semBarrierBreeched), b->pshared, 0); 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (result != 0) 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The barrier still exists and is valid 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * in the event of any error above. 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result = EBUSY; 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ptw32_mcs_lock_release(&node); 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (result); 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 104