I wanted just to implement this algorithm by C on Ubuntu:
wait for a certain time to receive input from keyboard, so, by getting possible input or by over time, the program should be continued.
I dont have any clue to do that! Thank you in advanced.
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http://stackoverflow.com/questions/1513734/problem-with-kbhitand-getch-for-linux – Martin Beckett Jan 27 '12 at 23:12
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Also see http://stackoverflow.com/questions/6839508/test-if-stdin-has-input-for-c-windows-and-or-linux/6839581#6839581 – Antti Jan 27 '12 at 23:25
2 Answers
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See the manual for the alarm() and signal() functions. You can easily timeout any code without using any threads or processes.
Michał Šrajer
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First of all thank you for reply. I think, in both solutions, run of program goes to wait state. But, my program has a graphic, which should be refreshed every .4 seconds, through this refreshing, a user may enter a key, so now, screen should be refreshed, to show the user's impact. – miryani Jan 28 '12 at 05:07
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The common way to do that is with select() or poll():
struct pollfd fd = {STDIN_FILENO, POLLIN};
switch(poll(&fd, 1, 1)){
case -1:
die("poll failed");
break;
case 0:
//timed out...
break;
default:
//read from stdin
}
Dave
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First of all thank you for reply. I think, in both solutions, run of program goes to wait state. But, my program has a graphic, which should be refreshed every .4 seconds, through this refreshing, a user may enter a key, so now, screen should be refreshed, to show the user's impact. – miryani Jan 28 '12 at 05:07