Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: infinite loop, synchronizing gossip-based method
Top Forums Programming infinite loop, synchronizing gossip-based method Post 302478598 by Corona688 on Wednesday 8th of December 2010 10:28:35 AM
Old 12-08-2010
Quote:
Originally Posted by saman_glorious
but i have no idea how you guessed the problem!
Easy: Look for code paths that lock a mutex but don't unlock it.
Quote:
I would thank if send me your running code as it seems you already run the program
I haven't completely followed the logic in your program, no. What I often look for in deadlocks is a pattern like this:
Code:
void something()
{
    lock_mutex();

    do_something();

    if(something_failed)
            return(error);

    unlock_mutex();
}

...meaning, if something_failed, something() returns early and doesn't unlock the mutex. Whatever else is waiting for could wait forever for an unlock that never happened.

How to fix that depends entirely on what you want to do with your function logic but might be as easy as
Code:
void something()
{
    lock_mutex();

    do_something();

    if(something_failed)
    {
            unlock_mutex();
            return(error);
    }

    unlock_mutex();
}

It's better to avoid return statements in a critical section entirely though, but how to do that also depends on your program logic.
 

10 More Discussions You Might Find Interesting

1. Solaris

ls command in infinite Loop

Hi, whenever I am giving a 'ls' command system is going into infinite loop displaying the current home directory. There is no separate shell script/file with ls name anywhere in the system. I am using Solaris 10. Any help / guidance in solving this problem is highly appreciated. ... (3 Replies)
Discussion started by: umakant
3 Replies

2. Shell Programming and Scripting

Infinite loop not looping

Hi guys, I'm having a problem getting my infinite loop to loop. It simply reads in the users choice form the menu, executes the corresponding case statement and quits instead of looping back to the main menu again. I have a feeling it might be something with my if then statements within the case... (2 Replies)
Discussion started by: hootdocta5
2 Replies

3. Programming

Is my code in an Infinite Loop?

Production C code compiled without the dash-g option is running, and seems to be in an infinite loop. Is there a way to tell? Is there a diagnostic tool that will report what objects or what lines of code or even what functions are being executed? Or is my best option to kill it with a dump? ... (5 Replies)
Discussion started by: marcus121
5 Replies

4. Shell Programming and Scripting

Infinite while loop

what is the difference between while:,while true and while false? (6 Replies)
Discussion started by: proactiveaditya
6 Replies

5. UNIX for Advanced & Expert Users

Procmail and infinite loop

I wanted to copy (not forward but copy) all incoming email to another address of mine. It worked, but now I encountered an infinite loop problem: When the second address doesn't like the content and bounces the message back, the bounce message will be sent back and forth. So, what I have in... (1 Reply)
Discussion started by: distill
1 Replies

6. Shell Programming and Scripting

Call a infinite loop

Hi All, I need to run an infinite loop. requirement below: function1 --> creates a file file1 function2 ---> need to call if the file creates i am running these both function via a script --> script.sh i need to run the function1 first and if the file file1 creates then need to run the... (3 Replies)
Discussion started by: satyaranjon
3 Replies

7. Homework & Coursework Questions

Help with infinite loop problem

1. The problem statement, all variables and given/known data: My problem is an infinite loop when i press any other key other then Y or y in the while loop. what i want it to do is return to the normal script outside of it if pressing N or n or keep asking the same question if its any other... (4 Replies)
Discussion started by: Ren_kun
4 Replies

8. Shell Programming and Scripting

My for loop decides to become an infinite loop?

Hi, I was debating if I should put this in the dummies or scripts section, I apologize in advance if I chose poorly. Fairly new to Unix and BASH scripting but I thought I made it fairly well given my limited understanding. However, the output indicates that it's looping and I'm ending up with a... (5 Replies)
Discussion started by: gotreef
5 Replies

9. Shell Programming and Scripting

How to stop infinite loop

Im unable to stop the below infinite loop (bash script). Can someone tell me why this isnt responding to signals eg: ctrl+c (SIGINT) or ctrl+z c=0 test_loop() { c=$(($c+1)) echo "count value is : $c " sleep 1 test_loop } Im using: SunOS 5.10 PS: If run this as... (13 Replies)
Discussion started by: Arun_Linux
13 Replies

10. Shell Programming and Scripting

Infinite loop query

I have a script script.shwhich is scheduled to run at 11 AM everyday. # script.sh Code: ./scb_script.sh & unfortunately scb_script.sh is running today in infinite loop as respective files are not available. My question, when script.sh starts running tomorrow, will the old process be... (1 Reply)
Discussion started by: JSKOBS
1 Replies

LEARN ABOUT ULTRIX

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
All times are GMT -4. The time now is 07:22 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy