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#include <sys/time.h> 259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <unistd.h> 269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <errno.h> 279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <pthread.h> 289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_thread.h" 309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_sysmutex_c.h" 319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstruct SDL_cond 339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall pthread_cond_t cond; 359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall}; 369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Create a condition variable */ 389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse HallSDL_cond * SDL_CreateCond(void) 399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_cond *cond; 419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond)); 439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cond ) { 449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( pthread_cond_init(&cond->cond, NULL) < 0 ) { 459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("pthread_cond_init() failed"); 469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(cond); 479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cond = NULL; 489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(cond); 519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Destroy a condition variable */ 549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDL_DestroyCond(SDL_cond *cond) 559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cond ) { 579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall pthread_cond_destroy(&cond->cond); 589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(cond); 599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Restart one of the threads that are waiting on the condition variable */ 639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallint SDL_CondSignal(SDL_cond *cond) 649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int retval; 669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( ! cond ) { 689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Passed a NULL condition variable"); 699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return -1; 709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = 0; 739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( pthread_cond_signal(&cond->cond) != 0 ) { 749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("pthread_cond_signal() failed"); 759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = -1; 769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return retval; 789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Restart all threads that are waiting on the condition variable */ 819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallint SDL_CondBroadcast(SDL_cond *cond) 829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int retval; 849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( ! cond ) { 869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Passed a NULL condition variable"); 879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return -1; 889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = 0; 919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( pthread_cond_broadcast(&cond->cond) != 0 ) { 929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("pthread_cond_broadcast() failed"); 939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = -1; 949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return retval; 969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallint SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms) 999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int retval; 1019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall struct timeval delta; 1029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall struct timespec abstime; 1039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( ! cond ) { 1059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Passed a NULL condition variable"); 1069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return -1; 1079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall gettimeofday(&delta, NULL); 1109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall abstime.tv_sec = delta.tv_sec + (ms/1000); 1129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000; 1139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( abstime.tv_nsec > 1000000000 ) { 1149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall abstime.tv_sec += 1; 1159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall abstime.tv_nsec -= 1000000000; 1169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall tryagain: 1199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime); 1209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (retval) { 1219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case EINTR: 1229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall goto tryagain; 1239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case ETIMEDOUT: 1259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = SDL_MUTEX_TIMEDOUT; 1269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 0: 1289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall default: 1309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("pthread_cond_timedwait() failed"); 1319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = -1; 1329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return retval; 1359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Wait on the condition variable, unlocking the provided mutex. 1389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall The mutex must be locked before entering this function! 1399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall */ 1409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallint SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex) 1419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int retval; 1439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( ! cond ) { 1459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Passed a NULL condition variable"); 1469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return -1; 1479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = 0; 1509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) { 1519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("pthread_cond_wait() failed"); 1529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = -1; 1539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return retval; 1559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 156