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/*
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 */
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