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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 CENTOS

alarm

ALARM(2)						     Linux Programmer's Manual							  ALARM(2)

NAME

       alarm - set an alarm clock for delivery of a signal

SYNOPSIS

       #include <unistd.h>

       unsigned int alarm(unsigned int seconds);

DESCRIPTION

       alarm() arranges for a SIGALRM signal to be delivered to the calling process in seconds seconds.

       If seconds is zero, any pending alarm is canceled.

       In any event any previously set alarm() is canceled.

RETURN VALUE

       alarm()	returns the number of seconds remaining until any previously scheduled alarm was due to be delivered, or zero if there was no pre-
       viously scheduled alarm.

CONFORMING TO

       SVr4, POSIX.1-2001, 4.3BSD.

NOTES

       alarm() and setitimer(2) share the same timer; calls to one will interfere with use of the other.

       sleep(3) may be implemented using SIGALRM; mixing calls to alarm() and sleep(3) is a bad idea.

       Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time.

SEE ALSO

       gettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2), signal(2), sleep(3), time(7)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2013-04-18								  ALARM(2)
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