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POSIX compatible timer's callback

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4864 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
nick 2002-02-25 14:24:11 +00:00
parent 1fe9e6e3bb
commit cb7768f9bb
3 changed files with 49 additions and 1 deletions
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2
linux/Makefile
View File

@ -3,7 +3,7 @@ include ../config.mak
LIBNAME = libosdep.a LIBNAME = libosdep.a
SRCS=getch2.c timer-lx.c shmem.c SRCS=getch2.c timer-lx.c timer.c shmem.c
OBJS=$(SRCS:.c=.o) OBJS=$(SRCS:.c=.o)
ifeq ($(TARGET_ARCH_X86),yes) ifeq ($(TARGET_ARCH_X86),yes)

40
linux/timer.c Normal file
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@ -0,0 +1,40 @@
/* POSIX compatible timer callback */
#include <sys/time.h>
#include <signal.h>
#include <stddef.h>
#include "timer.h"
static timer_callback *user_func = NULL;
static struct itimerval otimer;
static void (*old_alrm)(int) = SIG_DFL;
static void my_alarm_handler( int signo )
{
if(user_func) (*user_func)();
}
unsigned set_timer_callback(unsigned ms,timer_callback func)
{
unsigned ret;
struct itimerval itimer;
user_func = func;
getitimer(ITIMER_REAL,&otimer);
old_alrm = signal(SIGALRM,my_alarm_handler);
signal(SIGALRM,my_alarm_handler);
itimer.it_interval.tv_sec = 0;
itimer.it_interval.tv_usec = ms*1000;
itimer.it_value.tv_sec = 0;
itimer.it_value.tv_usec = ms*1000;
setitimer(ITIMER_REAL,&itimer,NULL);
getitimer(ITIMER_REAL,&itimer);
ret = itimer.it_interval.tv_sec*1000 + itimer.it_interval.tv_usec/1000;
if(!ret) restore_timer();
return ret;
}
void restore_timer(void)
{
signal(SIGALRM,old_alrm);
setitimer(ITIMER_REAL,&otimer,NULL);
}

8
linux/timer.h
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@ -1,3 +1,5 @@
#ifndef __TIMER_H
#define __TIMER_H
void InitTimer(); void InitTimer();
unsigned int GetTimer(); unsigned int GetTimer();
@ -7,3 +9,9 @@ float GetRelativeTime();
int usec_sleep(int usec_delay); int usec_sleep(int usec_delay);
/* timer's callback handling */
typedef void timer_callback( void );
extern unsigned set_timer_callback(unsigned ms,timer_callback func);
extern void restore_timer(void);
#endif