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Full Discussion: signal handling question
Top Forums Programming signal handling question Post 302201155 by matrixmadhan on Saturday 31st of May 2008 10:28:12 AM
Old 05-31-2008
Interesting!

This kind of seems to maintain the integrity which is definitely needed.

I have a question - might be foolish.

So, the process when its sleeping is in the 'sleep' state and after SIGALRM moves to 'ready_to_run' state and gets a slot in one of the scheduled queues based on the priority.

So, now what happens to the process ( A ) when there is some information / signal delivered to the process ( A ) which is in the run queue but not actually running ?

How is the kernel managing this ? Just because some other process ( B ) is urging the current process ( A ) for some reply, process ( A ) can't jump ahead of its run queue and start running.
 

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LEARN ABOUT FREEBSD

alarm

ALARM(3)						   BSD Library Functions Manual 						  ALARM(3)

NAME

     alarm -- set signal timer alarm

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     unsigned int
     alarm(unsigned int seconds);

DESCRIPTION

     This interface is made obsolete by setitimer(2).

     The alarm() function sets a timer to deliver the signal SIGALRM to the calling process after the specified number of seconds.  If an alarm
     has already been set with alarm() but has not been delivered, another call to alarm() will supersede the prior call.  The request alarm(0)
     voids the current alarm and the signal SIGALRM will not be delivered.

     Due to setitimer(2) restriction the maximum number of seconds allowed is 100000000.

RETURN VALUES

     The return value of alarm() is the amount of time left on the timer from a previous call to alarm().  If no alarm is currently set, the
     return value is 0.

SEE ALSO

     setitimer(2), sigaction(2), sigsuspend(2), signal(3), sleep(3), ualarm(3), usleep(3)

HISTORY

     An alarm() function appeared in Version 7 AT&T UNIX.

BSD
								  April 19, 1994							       BSD
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