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Full Discussion: Controlling child processes
Top Forums Programming Controlling child processes Post 49135 by Driver on Thursday 25th of March 2004 04:36:07 PM
Old 03-25-2004
In other words, the children are doing nothing while waiting for the parent's notification. I agree that you will need a semaphore then, because the order in which signals are handled cannot be enforced in a reliable manner without resorting to changing scheduling policies, which is definitely not justified in this case.

I would probably do this:
Have each child install a signal handler for SIGUSR1, without restarting interrupted system calls. Have a loop calling pause() for the desired number of times the PID shall be written. After the parent has signaled the current child, it goes to sleep on a semaphore. After the child has written its PID to the file, it awakes the parent by incrementing the semaphore and calls pause() again. The parent goes on to signal the next child, and so on. Good luck
 

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LEARN ABOUT DEBIAN

ctrlaltdel

CTRLALTDEL(8)						       System Administration						     CTRLALTDEL(8)

NAME

       ctrlaltdel - set the function of the Ctrl-Alt-Del combination

SYNOPSIS

       ctrlaltdel hard|soft

DESCRIPTION

       Based  on examination of the linux/kernel/sys.c code, it is clear that there are two supported functions that the Ctrl-Alt-Del sequence can
       perform: a hard reset, which immediately reboots the computer without calling sync(2) and without any other preparation; and a soft  reset,
       which sends the SIGINT (interrupt) signal to the init process (this is always the process with PID 1).  If this option is used, the init(8)
       program must support this feature.  Since there are now several init(8) programs in the Linux community, please consult	the  documentation
       for the version that you are currently using.

       ctrlaltdel is usually used in the /etc/rc.local file.

FILES

       /etc/rc.local

SEE ALSO

       simpleinit(8), init(8)

AUTHOR

       Peter Orbaek (poe@daimi.aau.dk)

AVAILABILITY

       The ctrlaltdel command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							   October 1993 						     CTRLALTDEL(8)
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