Prashanti Bedapudi wrote:
Attached is a piece of code using alarms, but I am seeing some unexpected
behavior. Any help will be appreciated.
- bool quit_now = 0;
+ volatile bool quit_now = 0;
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
------------------------------------------------------------------------
#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 = 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 =0;
printf("Inside alarm handler\n ");
for(i = 0; i<100; i++){
rt_alarm_wait(&dl_alarm);
printf("i = %d\n",i);
}
quit_now = 1;
printf("quit_now is set to %d\n",quit_now);
return;
}
int main()
{
int ret = 0;
signal(SIGTERM, catch_signal);
signal(SIGINT, catch_signal);
ret = rt_alarm_create(&dl_alarm, ALARM_NAME) ;
if (ret)
printf("\ncannot create alarm %d\n", ret);
ret = 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);
while(!quit_now);
printf("quit_now = %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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Philippe.
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