15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ------------------------------------------------------------- 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Module: sem_post_multiple.c 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Purpose: 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Semaphores aren't actually part of the PThreads standard. 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * They are defined by the POSIX Standard: 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * POSIX 1003.1b-1993 (POSIX.1b) 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ------------------------------------------------------------- 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * -------------------------------------------------------------------------- 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Pthreads-win32 - POSIX Threads Library for Win32 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright(C) 1998 John E. Bossom 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright(C) 1999,2005 Pthreads-win32 contributors 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Contact Email: rpj@callisto.canberra.edu.au 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The current list of contributors is contained 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * in the file CONTRIBUTORS included with the source 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * code distribution. The list can also be seen at the 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * following World Wide Web location: 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * http://sources.redhat.com/pthreads-win32/contributors.html 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This library is free software; you can redistribute it and/or 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * modify it under the terms of the GNU Lesser General Public 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * License as published by the Free Software Foundation; either 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * version 2 of the License, or (at your option) any later version. 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This library is distributed in the hope that it will be useful, 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * but WITHOUT ANY WARRANTY; without even the implied warranty of 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Lesser General Public License for more details. 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * You should have received a copy of the GNU Lesser General Public 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * License along with this library in the file COPYING.LIB; 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * if not, write to the Free Software Foundation, Inc., 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "pthread.h" 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "semaphore.h" 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "implement.h" 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)sem_post_multiple (sem_t * sem, int count) 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ------------------------------------------------------ 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DOCPUBLIC 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This function posts multiple wakeups to a semaphore. 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * PARAMETERS 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * sem 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * pointer to an instance of sem_t 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * count 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * counter, must be greater than zero. 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DESCRIPTION 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This function posts multiple wakeups to a semaphore. If there 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * are waiting threads (or processes), n <= count are awakened; 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * the semaphore value is incremented by count - n. 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * RESULTS 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 0 successfully posted semaphore, 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * -1 failed, error in errno 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ERRNO 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * EINVAL 'sem' is not a valid semaphore 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * or count is less than or equal to zero. 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ERANGE semaphore count is too big 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ------------------------------------------------------ 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int result = 0; 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) long waiters; 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) sem_t s = *sem; 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (s == NULL || count <= 0) 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result = EINVAL; 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else if ((result = pthread_mutex_lock (&s->lock)) == 0) 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* See sem_destroy.c 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (*sem == NULL) 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (void) pthread_mutex_unlock (&s->lock); 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result = EINVAL; 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return -1; 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (s->value <= (SEM_VALUE_MAX - count)) 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) waiters = -s->value; 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) s->value += count; 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (waiters > 0) 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(NEED_SEM) 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (SetEvent(s->sem)) 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) waiters--; 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) s->leftToUnblock += count - 1; 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (s->leftToUnblock > waiters) 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) s->leftToUnblock = waiters; 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (ReleaseSemaphore (s->sem, (waiters<=count)?waiters:count, 0)) 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* No action */ 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) s->value -= count; 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result = EINVAL; 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) result = ERANGE; 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (void) pthread_mutex_unlock (&s->lock); 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (result != 0) 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) errno = result; 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return -1; 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 0; 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} /* sem_post_multiple */ 143