| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2006 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| Sam Lantinga |
| slouken@libsdl.org |
| */ |
| #include "SDL_config.h" |
| |
| #ifdef SDL_TIMER_UNIX |
| |
| #include <stdio.h> |
| #include <sys/time.h> |
| #include <signal.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <errno.h> |
| |
| #include "SDL_timer.h" |
| #include "../SDL_timer_c.h" |
| |
| /* The clock_gettime provides monotonous time, so we should use it if |
| it's available. The clock_gettime function is behind ifdef |
| for __USE_POSIX199309 |
| Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005 |
| */ |
| #if HAVE_NANOSLEEP || HAVE_CLOCK_GETTIME |
| #include <time.h> |
| #endif |
| |
| #if SDL_THREAD_PTH |
| #include <pth.h> |
| #endif |
| |
| #if SDL_THREADS_DISABLED |
| #define USE_ITIMER |
| #endif |
| |
| /* The first ticks value of the application */ |
| #ifdef HAVE_CLOCK_GETTIME |
| static struct timespec start; |
| #else |
| static struct timeval start; |
| #endif /* HAVE_CLOCK_GETTIME */ |
| |
| |
| void SDL_StartTicks(void) |
| { |
| /* Set first ticks value */ |
| #if HAVE_CLOCK_GETTIME |
| clock_gettime(CLOCK_MONOTONIC,&start); |
| #else |
| gettimeofday(&start, NULL); |
| #endif |
| } |
| |
| Uint32 SDL_GetTicks (void) |
| { |
| #if HAVE_CLOCK_GETTIME |
| Uint32 ticks; |
| struct timespec now; |
| clock_gettime(CLOCK_MONOTONIC,&now); |
| ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_nsec-start.tv_nsec)/1000000; |
| return(ticks); |
| #else |
| Uint32 ticks; |
| struct timeval now; |
| gettimeofday(&now, NULL); |
| ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000; |
| return(ticks); |
| #endif |
| } |
| |
| void SDL_Delay (Uint32 ms) |
| { |
| #if SDL_THREAD_PTH |
| pth_time_t tv; |
| tv.tv_sec = ms/1000; |
| tv.tv_usec = (ms%1000)*1000; |
| pth_nap(tv); |
| #else |
| int was_error; |
| |
| #if HAVE_NANOSLEEP |
| struct timespec elapsed, tv; |
| #else |
| struct timeval tv; |
| Uint32 then, now, elapsed; |
| #endif |
| |
| /* Set the timeout interval */ |
| #if HAVE_NANOSLEEP |
| elapsed.tv_sec = ms/1000; |
| elapsed.tv_nsec = (ms%1000)*1000000; |
| #else |
| then = SDL_GetTicks(); |
| #endif |
| do { |
| errno = 0; |
| |
| #if HAVE_NANOSLEEP |
| tv.tv_sec = elapsed.tv_sec; |
| tv.tv_nsec = elapsed.tv_nsec; |
| was_error = nanosleep(&tv, &elapsed); |
| #else |
| /* Calculate the time interval left (in case of interrupt) */ |
| now = SDL_GetTicks(); |
| elapsed = (now-then); |
| then = now; |
| if ( elapsed >= ms ) { |
| break; |
| } |
| ms -= elapsed; |
| tv.tv_sec = ms/1000; |
| tv.tv_usec = (ms%1000)*1000; |
| |
| was_error = select(0, NULL, NULL, NULL, &tv); |
| #endif /* HAVE_NANOSLEEP */ |
| } while ( was_error && (errno == EINTR) ); |
| #endif /* SDL_THREAD_PTH */ |
| } |
| |
| #ifdef USE_ITIMER |
| |
| static void HandleAlarm(int sig) |
| { |
| Uint32 ms; |
| |
| if ( SDL_alarm_callback ) { |
| ms = (*SDL_alarm_callback)(SDL_alarm_interval); |
| if ( ms != SDL_alarm_interval ) { |
| SDL_SetTimer(ms, SDL_alarm_callback); |
| } |
| } |
| } |
| |
| int SDL_SYS_TimerInit(void) |
| { |
| struct sigaction action; |
| |
| /* Set the alarm handler (Linux specific) */ |
| SDL_memset(&action, 0, sizeof(action)); |
| action.sa_handler = HandleAlarm; |
| action.sa_flags = SA_RESTART; |
| sigemptyset(&action.sa_mask); |
| sigaction(SIGALRM, &action, NULL); |
| return(0); |
| } |
| |
| void SDL_SYS_TimerQuit(void) |
| { |
| SDL_SetTimer(0, NULL); |
| } |
| |
| int SDL_SYS_StartTimer(void) |
| { |
| struct itimerval timer; |
| |
| timer.it_value.tv_sec = (SDL_alarm_interval/1000); |
| timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000; |
| timer.it_interval.tv_sec = (SDL_alarm_interval/1000); |
| timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000; |
| setitimer(ITIMER_REAL, &timer, NULL); |
| return(0); |
| } |
| |
| void SDL_SYS_StopTimer(void) |
| { |
| struct itimerval timer; |
| |
| SDL_memset(&timer, 0, (sizeof timer)); |
| setitimer(ITIMER_REAL, &timer, NULL); |
| } |
| |
| #else /* USE_ITIMER */ |
| |
| #include "SDL_thread.h" |
| |
| /* Data to handle a single periodic alarm */ |
| static int timer_alive = 0; |
| static SDL_Thread *timer = NULL; |
| |
| static int RunTimer(void *unused) |
| { |
| while ( timer_alive ) { |
| if ( SDL_timer_running ) { |
| SDL_ThreadedTimerCheck(); |
| } |
| SDL_Delay(1); |
| } |
| return(0); |
| } |
| |
| /* This is only called if the event thread is not running */ |
| int SDL_SYS_TimerInit(void) |
| { |
| timer_alive = 1; |
| timer = SDL_CreateThread(RunTimer, NULL); |
| if ( timer == NULL ) |
| return(-1); |
| return(SDL_SetTimerThreaded(1)); |
| } |
| |
| void SDL_SYS_TimerQuit(void) |
| { |
| timer_alive = 0; |
| if ( timer ) { |
| SDL_WaitThread(timer, NULL); |
| timer = NULL; |
| } |
| } |
| |
| int SDL_SYS_StartTimer(void) |
| { |
| SDL_SetError("Internal logic error: Linux uses threaded timer"); |
| return(-1); |
| } |
| |
| void SDL_SYS_StopTimer(void) |
| { |
| return; |
| } |
| |
| #endif /* USE_ITIMER */ |
| |
| #endif /* SDL_TIMER_UNIX */ |