Timers

[ankursaxena]

Hi! I want to know how exactly would you implement a timer in C++, which lets the current thread run and send a signal after a time out to the original thread so that the thread can do some work. just like an event i guess.
may be like

#define init 1
#define time_out 2

signal = init;
start_timer(sec); //this sets the signal to time_out

while(signal != time_out)
{
..
do other stuff that u might want to
}

do the stuff u wanted to do when the timer expired.

thanx a lot in advance..

actually better still if there are some good tutorials on this topic, it would be great.

thanx.

 

[ankursaxena]

someone please help!!! dont tell me no one knows this..has to be some one..plzzz!!

 

[rbobbitt]

One way is to use alarm() which sends a SIGALRM after a specified number of seconds.

#include <signal.h>
#include <unistd.h>

static volatile sig_atomic_t got_alarm;

static void
handler(int sig)
{
got_alarm=1;
}
int main()
{
signal(SIGALRM,handler);
/* Alarm will sound in 60 seconds */
alarm(60);
while (!got_alarm) {
/* Do stuff - until alarm */
}
return 0;
}

BTW, it isn't helpful (and a little rude, in my opinion) to post followup messages to your own post like you did above.

If anything, it probably tends to *prevent* responses because people will see that the thread count has increased and may not bother reading the thread, assuming the question has been answered.
Russ
bobbitts@hotmail.com

http://home.earthlink.net/~bobbitts