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/**
* @namespace biewlib
* @file biewlib/sysdep/generic/posix/timer.c
* @brief This file contains implementation of timer depended part for POSIX.
* @version -
* @remark this source file is part of Binary vIEW project (BIEW).
* The Binary vIEW (BIEW) is copyright (C) 1995 Nick Kurshev.
* All rights reserved. This software is redistributable under the
* licence given in the file "Licence.en" ("Licence.ru" in russian
* translation) distributed in the BIEW archive.
* @note Requires POSIX compatible development system
*
* @author Nick Kurshev
* @since 1999
* @note Development, fixes and improvements
**/
#include <sys/time.h>
#include <signal.h>
#include <stddef.h>
#include "biewlib/biewlib.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 __FASTCALL__ __OsSetTimerCallBack(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) __OsRestoreTimer();
return ret;
}
/* Restore time callback function to original
state */
void __FASTCALL__ __OsRestoreTimer(void)
{
signal(SIGALRM,old_alrm);
setitimer(ITIMER_REAL,&otimer,NULL);
}
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