15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * pthread_rwlockattr_getpshared.c 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Description: 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This translation unit implements read/write lock 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 <limits.h> 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "pthread.h" 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "implement.h" 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)pthread_rwlockattr_getpshared (const pthread_rwlockattr_t * attr, 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int *pshared) 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ------------------------------------------------------ 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DOCPUBLIC 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Determine whether rwlocks created with 'attr' can be 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * shared between processes. 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * PARAMETERS 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * attr 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * pointer to an instance of pthread_rwlockattr_t 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * pshared 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * will be set to one of: 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * PTHREAD_PROCESS_SHARED 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * May be shared if in shared memory 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * PTHREAD_PROCESS_PRIVATE 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Cannot be shared. 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DESCRIPTION 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Rwlocks creatd with 'attr' can be shared between 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * processes if pthread_rwlock_t variable is allocated 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * in memory shared by these processes. 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * NOTES: 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 1) pshared rwlocks MUST be allocated in shared 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * memory. 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 2) The following macro is defined if shared rwlocks 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * are supported: 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * _POSIX_THREAD_PROCESS_SHARED 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * RESULTS 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 0 successfully retrieved attribute, 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * EINVAL 'attr' is invalid, 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ------------------------------------------------------ 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int result; 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((attr != NULL && *attr != NULL) && (pshared != NULL)) 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *pshared = (*attr)->pshared; 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result = 0; 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result = EINVAL; 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (result); 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} /* pthread_rwlockattr_getpshared */ 98