diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/timer/unix/SDL_systimer.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/timer/unix/SDL_systimer.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/timer/unix/SDL_systimer.c b/distrib/sdl-1.2.15/src/timer/unix/SDL_systimer.c new file mode 100644 index 0000000..80b2228 --- /dev/null +++ b/distrib/sdl-1.2.15/src/timer/unix/SDL_systimer.c @@ -0,0 +1,240 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 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 */ |