Login or Register to Ask a Question and Join Our Community

Sponsored Content
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.
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Handling SIGUSR2 signal

HI, I need to handle SIGUSR2 signal in my application to change the state of the application dynamically. I have implemented the signal handler. However the application is able to catch only one SIGUSR2 signal. The second SIGUSR2 signal causes the application to crash. This is happning only with... (3 Replies)
Discussion started by: diganta
3 Replies

2. UNIX for Advanced & Expert Users

signal handling in shell script

Hi can any please tell me is it possible to catch the signal in a shell script like we do in C. if yes please give me some idea or a link. (4 Replies)
Discussion started by: Raom
4 Replies

3. Programming

Signal Handling

Hi folks I'm trying to write a signal handler (in c on HPUX) that will catch the child process launched by execl when it's finished so that I can check a compliance file. The signal handler appears to catch the child process terminating however when the signal handler completes the parent... (3 Replies)
Discussion started by: themezzaman
3 Replies

4. Shell Programming and Scripting

Signal handling in Perl

Guys, I'm doing signal handling in Perl. I'm trying to catch ^C signal inside the script. There two scripts : one shell script and one perl script. The shell script calls the perl script. For e.g. shell script a.sh and perl scipt sig.pl. Shell script a.sh looks something like this :... (6 Replies)
Discussion started by: obelix
6 Replies

5. Programming

signal handling while in a function other than main

Hi, I have a main loop which calls a sub loop, which finally returns to the main loop itself. The main loop runs when a flag is set. Now, I have a signal handler for SIGINT, which resets the flag and thus stops the main loop. Suppose I send SIGINT while the program is in subloop, I get an error... (1 Reply)
Discussion started by: Theju
1 Replies

6. Programming

Signal Handling and Context Switches

Hi guys, this is my first posting, so at first hi to everyone! ;) I have a problem with ucontext_t in connection with signal handling. I want to simulate a preemptive scheduler. I am using the iTimer with ITIMER_PROF, to schedule the interrupts. You find the code below: #include <stdio.h>... (18 Replies)
Discussion started by: XComp
18 Replies

7. Programming

Signal handling

I am trying to write a small program where I can send signals and then ask for an action to be triggered if that signal is received. For example, here is an example where I am trying to write a programme that will say you pressed ctrl*c when someone presses ctrl+c. My questions are what you would... (1 Reply)
Discussion started by: #moveon
1 Replies

8. Programming

problem in SIGSEGV signal handling

i wrote handler for sigsegv such that i can allocate memory for a variable to which sigsegv generated for illlegal acces of memory. my code is #include <signal.h> #include<stdio.h> #include<stdlib.h> #include<string.h> char *j; void segv_handler(int dummy) { j=(char *)malloc(10); ... (4 Replies)
Discussion started by: pavan6754
4 Replies

9. UNIX and Linux Applications

SIGSEGV Signal handling

Hello, Can anybody tell me how can i handle segmentation fault signal, in C code? (2 Replies)
Discussion started by: mustus
2 Replies

10. Programming

problem in reforking and signal handling

hi friends i have a problem in signal handling ... let me explain my problem clearly.. i have four process .. main process forks two child process and each child process again forks another new process respectively... the problem is whenever i kill the child process it is reforking and the... (2 Replies)
Discussion started by: senvenugopal
2 Replies

LEARN ABOUT CENTOS

sleep

SLEEP(3)						     Linux Programmer's Manual							  SLEEP(3)

NAME

       sleep - sleep for the specified number of seconds

SYNOPSIS

       #include <unistd.h>

       unsigned int sleep(unsigned int seconds);

DESCRIPTION

       sleep() makes the calling thread sleep until seconds seconds have elapsed or a signal arrives which is not ignored.

RETURN VALUE

       Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.

CONFORMING TO

       POSIX.1-2001.

BUGS

       sleep() may be implemented using SIGALRM; mixing calls to alarm(2) and sleep() is a bad idea.

       Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.

SEE ALSO

       alarm(2), nanosleep(2), signal(2), signal(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/.

GNU
								    2010-02-03								  SLEEP(3)
All times are GMT -4. The time now is 05:45 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy