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From: "Prashanti Bedapudi" <pbedapudi@domain.hid>
Date: Sun, 7 May 2006 15:33:47 -0500
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Subject: [Xenomai-help] help on alarms..
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Attached is a piece of code using alarms, but I am seeing some unexpected
behavior.  Any help will be appreciated.

in function main() the program behaves two different ways depending on where
I have the last printf()

1. It works fine and terminates as expected if I have it like this
	while(!quit_now)
	   printf("quit_now = %d\n", quit_now);

2. It does not terminate if I have it this way. I know quit_now is set to 1,
since the last statement printed is 'quit_now is set to 1'.

	while(!quit_now);
	printf("quit_now = %d\n", quit_now);

thanks,
Shanti


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	filename="alarmtest.cpp"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <native/types.h>
#include <native/alarm.h>
#include <native/task.h>


#define ALARM_NAME  "dl_alarm2"
#define ALARM_TASK_NAME	"dl_alarm_task"
#define ALARM_TIME 500000
#define ALARM_INTERVAL 250000
#define ALARM_TASK_PRIO  20

RT_ALARM dl_alarm;
RT_TASK alarm_task;
bool quit_now =3D 0;


void catch_signal(int sig)
{
	rt_alarm_stop(&dl_alarm);
	rt_alarm_delete(&dl_alarm);
	rt_task_delete(&alarm_task);
	exit(0);
}



static void alarm_handler(void *cookie)
{
	int i =3D0;

	printf("Inside alarm handler\n ");
	for(i =3D 0; i<100; i++){
		rt_alarm_wait(&dl_alarm);
		printf("i =3D %d\n",i);
	}

	quit_now =3D 1;
	printf("quit_now is set to %d\n",quit_now);
	return;
=09
}

int main()
{
	int ret =3D 0;

	signal(SIGTERM, catch_signal);=0A=
    signal(SIGINT, catch_signal);

	ret =3D rt_alarm_create(&dl_alarm, ALARM_NAME) ;
	if (ret)
		printf("\ncannot create alarm %d\n", ret);
=09
	ret =3D  rt_task_spawn(&alarm_task, ALARM_TASK_NAME, 0, =
ALARM_TASK_PRIO, 0, &alarm_handler, NULL);
	if(ret)
		exit(0);

	rt_alarm_start(&dl_alarm, ALARM_TIME, ALARM_INTERVAL);
=09

	while(!quit_now);
		printf("quit_now =3D %d\n",quit_now);


	rt_alarm_stop(&dl_alarm);
	rt_alarm_delete(&dl_alarm);
	rt_task_delete(&alarm_task);

	return 0;
}

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