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Full Discussion: Multi threading using fork
Top Forums Programming Multi threading using fork Post 44029 by Perderabo on Thursday 27th of November 2003 05:18:13 PM
Old 11-27-2003
Well, you're not off to very good start here. Smilie

The text of your post says your program "will run a set of process using fork." But even the comments in your code disagrees with that. When you run system() in a loop as you are doing, you will run one program after another. After the tenth program finishes, the ChildProcess function will return. Then your program finally performs it's first and only fork() which is a demo. And then it exits.

To get the ball rolling, you need to call fork() 10 times in a loop. And each child process will need run one of your jobs. One of the exec() calls would be much better than system().

I think that you should get this much working first.

But basicly you will need to install a signal handler that catches SIGCHLD to detect the death of a child.
 

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stopped(7)						 Miscellaneous Information Manual						stopped(7)

NAME
stopped - event signalling that a job has stopped SYNOPSIS
stopped JOB=JOB INSTANCE=INSTANCE RESULT=RESULT [PROCESS=PROCESS] [EXIT_STATUS=STATUS] [EXIT_SIGNAL=SIGNAL] [ENV]... DESCRIPTION
The stopped event is generated by the Upstart init(8) daemon when an instance of a job has stopped. The JOB environment variable contains the job name, and the INSTANCE environment variable contains the instance name which will be empty for single-instance jobs. If the job was stopped normally, the RESULT environment variable will be ok, otherwise if the job was stopped because it has failed it will be failed. When the job has failed, the process that failed will be given in the PROCESS environment variable. This may be pre-start, post-start, main, pre-stop or post-stop; it may also be the special value respawn to indicate that the job was stopped because it hit the respawn limit. Finally in the case of a failed job, one of either EXIT_STATUS or EXIT_SIGNAL may be given to indicate the cause of the stop. Either EXIT_STATUS will contain the exit status code of the process, or EXIT_SIGNAL will contain the name of the signal that the process received. The normal exit job configuration stanza can be used to prevent particular exit status values or signals resulting in a failed job, see init(5) for more information. If neither EXIT_STATUS or EXIT_SIGNAL is given for a failed process, it is because the process failed to spawn (for example, file not found). See the system logs for the error. init(8) emits this event as an informational signal, services and tasks started or stopped by this event will do so in parallel with other activity. It is typically combined with the starting(7) event by services when inserting themselves as a dependency. Job configuration files may use the export stanza to export environment variables from their own environment into the stopped event. See init(5) for more details. EXAMPLE
A service that wishes to be running whenever another service would be running, started before and stopped after it, might use: start on starting apache stop on stopped apache A task that must be run after another task or service has been stopped might use: start on stopped postgresql SEE ALSO
starting(7) started(7) stopping(7) init(5) Upstart 2009-07-09 stopped(7)
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