src/timer/unix/SDL_systimer.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 13 Jul 2010 22:26:50 -0700
changeset 4515 54cbc34229f4
parent 3697 f7b03b6838cb
child 5111 481dabb098ef
permissions -rw-r--r--
Fixed compile warnings
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2010 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,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    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
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    License along with this library; if not, write to the Free Software
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    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_UNIX
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#include <stdio.h>
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#include <sys/time.h>
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#include <signal.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include "SDL_timer.h"
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#include "../SDL_systimer.h"
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#include "../SDL_timer_c.h"
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/* The clock_gettime provides monotonous time, so we should use it if
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   it's available. The clock_gettime function is behind ifdef
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   for __USE_POSIX199309
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   Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005
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*/
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#if HAVE_NANOSLEEP || HAVE_CLOCK_GETTIME
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#include <time.h>
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#endif
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#if SDL_THREADS_DISABLED
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#define USE_ITIMER
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#endif
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/* The first ticks value of the application */
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#ifdef HAVE_CLOCK_GETTIME
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static struct timespec start;
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#else
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static struct timeval start;
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#endif /* HAVE_CLOCK_GETTIME */
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void
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SDL_StartTicks(void)
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{
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    /* Set first ticks value */
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#if HAVE_CLOCK_GETTIME
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    clock_gettime(CLOCK_MONOTONIC, &start);
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#else
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    gettimeofday(&start, NULL);
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#endif
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}
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Uint32
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SDL_GetTicks(void)
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{
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#if HAVE_CLOCK_GETTIME
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    Uint32 ticks;
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    struct timespec now;
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    clock_gettime(CLOCK_MONOTONIC, &now);
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    ticks =
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        (now.tv_sec - start.tv_sec) * 1000 + (now.tv_nsec -
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                                              start.tv_nsec) / 1000000;
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    return (ticks);
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#else
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    Uint32 ticks;
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    struct timeval now;
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    gettimeofday(&now, NULL);
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    ticks =
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        (now.tv_sec - start.tv_sec) * 1000 + (now.tv_usec -
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                                              start.tv_usec) / 1000;
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    return (ticks);
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#endif
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}
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void
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SDL_Delay(Uint32 ms)
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{
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    int was_error;
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#if HAVE_NANOSLEEP
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    struct timespec elapsed, tv;
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#else
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    struct timeval tv;
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    Uint32 then, now, elapsed;
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#endif
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    /* Set the timeout interval */
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#if HAVE_NANOSLEEP
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    elapsed.tv_sec = ms / 1000;
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    elapsed.tv_nsec = (ms % 1000) * 1000000;
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#else
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    then = SDL_GetTicks();
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#endif
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    do {
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        errno = 0;
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#if HAVE_NANOSLEEP
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        tv.tv_sec = elapsed.tv_sec;
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        tv.tv_nsec = elapsed.tv_nsec;
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        was_error = nanosleep(&tv, &elapsed);
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#else
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        /* Calculate the time interval left (in case of interrupt) */
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        now = SDL_GetTicks();
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        elapsed = (now - then);
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        then = now;
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        if (elapsed >= ms) {
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            break;
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        }
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        ms -= elapsed;
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        tv.tv_sec = ms / 1000;
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        tv.tv_usec = (ms % 1000) * 1000;
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        was_error = select(0, NULL, NULL, NULL, &tv);
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#endif /* HAVE_NANOSLEEP */
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    } while (was_error && (errno == EINTR));
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}
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#ifdef USE_ITIMER
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static void
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HandleAlarm(int sig)
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{
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    Uint32 ms;
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    if (SDL_alarm_callback) {
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        ms = (*SDL_alarm_callback) (SDL_alarm_interval);
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        if (ms != SDL_alarm_interval) {
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            SDL_SetTimer(ms, SDL_alarm_callback);
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        }
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    }
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}
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int
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SDL_SYS_TimerInit(void)
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{
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    struct sigaction action;
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    /* Set the alarm handler (Linux specific) */
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    SDL_memset(&action, 0, sizeof(action));
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    action.sa_handler = HandleAlarm;
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    action.sa_flags = SA_RESTART;
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    sigemptyset(&action.sa_mask);
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    sigaction(SIGALRM, &action, NULL);
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    return (0);
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}
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void
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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
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SDL_SYS_StartTimer(void)
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{
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    struct itimerval timer;
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    timer.it_value.tv_sec = (SDL_alarm_interval / 1000);
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    timer.it_value.tv_usec = (SDL_alarm_interval % 1000) * 1000;
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    timer.it_interval.tv_sec = (SDL_alarm_interval / 1000);
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    timer.it_interval.tv_usec = (SDL_alarm_interval % 1000) * 1000;
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    setitimer(ITIMER_REAL, &timer, NULL);
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    return (0);
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}
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void
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SDL_SYS_StopTimer(void)
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{
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    struct itimerval timer;
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    SDL_memset(&timer, 0, (sizeof timer));
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    setitimer(ITIMER_REAL, &timer, NULL);
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}
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#else /* USE_ITIMER */
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#include "SDL_thread.h"
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/* Data to handle a single periodic alarm */
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static int timer_alive = 0;
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static SDL_Thread *timer = NULL;
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static int
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RunTimer(void *unused)
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{
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    while (timer_alive) {
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        if (SDL_timer_running) {
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            SDL_ThreadedTimerCheck();
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        }
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        SDL_Delay(1);
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    }
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    return (0);
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}
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/* This is only called if the event thread is not running */
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int
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SDL_SYS_TimerInit(void)
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{
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    timer_alive = 1;
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    timer = SDL_CreateThread(RunTimer, NULL);
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    if (timer == NULL)
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        return (-1);
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    return (SDL_SetTimerThreaded(1));
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}
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void
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SDL_SYS_TimerQuit(void)
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{
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    timer_alive = 0;
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    if (timer) {
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        SDL_WaitThread(timer, NULL);
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        timer = NULL;
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    }
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}
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int
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SDL_SYS_StartTimer(void)
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{
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    SDL_SetError("Internal logic error: Linux uses threaded timer");
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    return (-1);
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}
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void
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SDL_SYS_StopTimer(void)
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{
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    return;
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}
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#endif /* USE_ITIMER */
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#endif /* SDL_TIMER_UNIX */
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/* vi: set ts=4 sw=4 expandtab: */