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SDL_systimer.c
248 lines (198 loc) · 5.05 KB
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifdef SDL_TIMER_RISCOS
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#include <stdio.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "SDL_timer.h"
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#include "../SDL_timer_c.h"
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#if SDL_THREADS_DISABLED
/* Timer SDL_arraysize(Timer ),start/reset time */
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static Uint32 timerStart;
/* Timer running function */
void RISCOS_CheckTimer();
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#else
#include <pthread.h>
extern Uint32 riscos_main_thread;
extern int riscos_using_threads;
extern Uint32 SDL_ThreadID();
extern Uint32 SDL_EventThreadID(void);
#endif
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extern void RISCOS_BackgroundTasks(void);
/* The first ticks value of the application */
clock_t start;
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void
SDL_StartTicks(void)
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{
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/* Set first ticks value */
start = clock();
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}
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Uint32
SDL_GetTicks(void)
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{
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clock_t ticks;
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ticks = clock() - start;
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#if CLOCKS_PER_SEC == 1000
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return (ticks);
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#elif CLOCKS_PER_SEC == 100
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return (ticks * 10);
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#else
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return ticks * (1000 / CLOCKS_PER_SEC);
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#endif
}
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void
SDL_Delay(Uint32 ms)
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{
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Uint32 now, then, elapsed;
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#if !SDL_THREADS_DISABLED
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int is_event_thread;
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if (riscos_using_threads) {
is_event_thread = 0;
if (SDL_EventThreadID()) {
if (SDL_EventThreadID() == SDL_ThreadID())
is_event_thread = 1;
} else if (SDL_ThreadID() == riscos_main_thread)
is_event_thread = 1;
} else
is_event_thread = 1;
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#endif
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/*TODO: Next version of Unixlib may allow us to use usleep here */
/* for non event threads */
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/* Set the timeout interval - Linux only needs to do this once */
then = SDL_GetTicks();
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do {
/* Do background tasks required while sleeping as we are not multithreaded */
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#if SDL_THREADS_DISABLED
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RISCOS_BackgroundTasks();
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#else
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/* For threaded build only run background tasks in event thread */
if (is_event_thread)
RISCOS_BackgroundTasks();
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#endif
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/* Calculate the time interval left (in case of interrupt) */
now = SDL_GetTicks();
elapsed = (now - then);
then = now;
if (elapsed >= ms) {
break;
}
ms -= elapsed;
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#if !SDL_THREADS_DISABLED
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/* Need to yield to let other threads have a go */
if (riscos_using_threads)
pthread_yield();
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#endif
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} while (1);
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}
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#if SDL_THREADS_DISABLED
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/* Non-threaded version of timer */
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int
SDL_SYS_TimerInit(void)
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{
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return (0);
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}
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void
SDL_SYS_TimerQuit(void)
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{
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SDL_SetTimer(0, NULL);
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}
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int
SDL_SYS_StartTimer(void)
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{
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timerStart = SDL_GetTicks();
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return (0);
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}
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void
SDL_SYS_StopTimer(void)
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{
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/* Don't need to do anything as we use SDL_timer_running
to detect if we need to check the timer */
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}
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void
RISCOS_CheckTimer()
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{
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if (SDL_timer_running
&& SDL_GetTicks() - timerStart >= SDL_alarm_interval) {
Uint32 ms;
ms = SDL_alarm_callback(SDL_alarm_interval);
if (ms != SDL_alarm_interval) {
if (ms) {
SDL_alarm_interval = ROUND_RESOLUTION(ms);
} else {
SDL_alarm_interval = 0;
SDL_timer_running = 0;
}
}
if (SDL_alarm_interval)
timerStart = SDL_GetTicks();
}
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}
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#else
/* Threaded version of timer - based on code for linux */
#include "SDL_thread.h"
/* Data to handle a single periodic alarm */
static int timer_alive = 0;
static SDL_Thread *timer = NULL;
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static int
RunTimer(void *unused)
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{
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while (timer_alive) {
if (SDL_timer_running) {
SDL_ThreadedTimerCheck();
}
SDL_Delay(1);
}
return (0);
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}
/* This is only called if the event thread is not running */
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int
SDL_SYS_TimerInit(void)
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{
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timer_alive = 1;
timer = SDL_CreateThread(RunTimer, NULL);
if (timer == NULL)
return (-1);
return (SDL_SetTimerThreaded(1));
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}
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void
SDL_SYS_TimerQuit(void)
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{
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timer_alive = 0;
if (timer) {
SDL_WaitThread(timer, NULL);
timer = NULL;
}
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}
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int
SDL_SYS_StartTimer(void)
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{
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SDL_SetError("Internal logic error: RISC OS uses threaded timer");
return (-1);
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}
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void
SDL_SYS_StopTimer(void)
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{
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return;
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}
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#endif /* SDL_THREADS_DISABLED */
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#endif /* SDL_TIMER_RISCOS */
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/* vi: set ts=4 sw=4 expandtab: */