19682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* 29682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL - Simple DirectMedia Layer 39682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Copyright (C) 1997-2012 Sam Lantinga 49682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 59682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall This library is free software; you can redistribute it and/or 69682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall modify it under the terms of the GNU Lesser General Public 79682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall License as published by the Free Software Foundation; either 89682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall version 2.1 of the License, or (at your option) any later version. 99682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall This library is distributed in the hope that it will be useful, 119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall but WITHOUT ANY WARRANTY; without even the implied warranty of 129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Lesser General Public License for more details. 149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall You should have received a copy of the GNU Lesser General Public 169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall License along with this library; if not, write to the Free Software 179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sam Lantinga 209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall slouken@libsdl.org 219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall*/ 229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_config.h" 239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* RISC OS implementations uses pthreads based on linux code */ 259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#if SDL_THREADS_DISABLED 279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "../generic/SDL_syscond.c" 289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#else 299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <sys/time.h> 309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <unistd.h> 319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <pthread.h> 329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_thread.h" 349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_sysmutex_c.h" 359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstruct SDL_cond 379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall pthread_cond_t cond; 399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall}; 409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Create a condition variable */ 429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse HallSDL_cond * SDL_CreateCond(void) 439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_cond *cond; 459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond)); 479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cond ) { 489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( pthread_cond_init(&cond->cond, NULL) < 0 ) { 499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("pthread_cond_init() failed"); 509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(cond); 519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cond = NULL; 529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(cond); 559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Destroy a condition variable */ 589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDL_DestroyCond(SDL_cond *cond) 599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cond ) { 619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall pthread_cond_destroy(&cond->cond); 629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(cond); 639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Restart one of the threads that are waiting on the condition variable */ 679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallint SDL_CondSignal(SDL_cond *cond) 689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int retval; 709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( ! cond ) { 729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Passed a NULL condition variable"); 739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return -1; 749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = 0; 779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( pthread_cond_signal(&cond->cond) != 0 ) { 789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("pthread_cond_signal() failed"); 799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = -1; 809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return retval; 829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Restart all threads that are waiting on the condition variable */ 859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallint SDL_CondBroadcast(SDL_cond *cond) 869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int retval; 889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( ! cond ) { 909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Passed a NULL condition variable"); 919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return -1; 929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = 0; 959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( pthread_cond_broadcast(&cond->cond) != 0 ) { 969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("pthread_cond_broadcast() failed"); 979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = -1; 989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return retval; 1009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallint SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms) 1039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int retval; 1059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall struct timeval delta; 1069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall struct timespec abstime; 1079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( ! cond ) { 1099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Passed a NULL condition variable"); 1109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return -1; 1119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall gettimeofday(&delta, NULL); 1149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall abstime.tv_sec = delta.tv_sec + (ms/1000); 1169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000; 1179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( abstime.tv_nsec > 1000000000 ) { 1189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall abstime.tv_sec += 1; 1199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall abstime.tv_nsec -= 1000000000; 1209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall tryagain: 1239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime); 1249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (retval) { 1259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case EINTR: 1269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall goto tryagain; 1279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case ETIMEDOUT: 1299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = SDL_MUTEX_TIMEDOUT; 1309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 0: 1329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall default: 1349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("pthread_cond_timedwait() failed"); 1359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = -1; 1369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return retval; 1399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Wait on the condition variable, unlocking the provided mutex. 1429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall The mutex must be locked before entering this function! 1439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall */ 1449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallint SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex) 1459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int retval; 1479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( ! cond ) { 1499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Passed a NULL condition variable"); 1509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return -1; 1519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = 0; 1549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) { 1559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("pthread_cond_wait() failed"); 1569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = -1; 1579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return retval; 1599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 161