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Full Discussion: How to limit the number of child processes
Top Forums Programming How to limit the number of child processes Post 302370511 by xyzt on Wednesday 11th of November 2009 04:34:18 PM
Old 11-11-2009
How to limit the number of child processes
I need a mechanism to fork child processes and all child processes should connect to a server.but the number of child processes should be limited(for ex:50)
Here's my pseudo, but I cant figure out how to limit the child process number. Should I use a semaphore? or what?
Code:
        
        for(;;)
        {
                pid=fork();
                switch(pid)
                {
                        case -1:
                                perror("fork");
                                break;
                        case 0:
                                Job();
                                sleep(5);
                                exit(0);
                                break;
                        default:
                                sleep(3);
                                break;
                }
        }

PS: i use Linux.
 

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LEARN ABOUT V7

fork

FORK(2) 							System Calls Manual							   FORK(2)

NAME

       fork  -	spawn new process

SYNOPSIS

       fork( )

DESCRIPTION

       Fork  is  the only way new processes are created.  The new process's core image is a copy of that of the caller of fork.  The only distinc-
       tion is the fact that the value returned in the old (parent) process contains the process ID of the new (child) process,  while	the  value
       returned in the child is 0.  Process ID's range from 1 to 30,000.  This process ID is used by wait(2).

       Files open before the fork are shared, and have a common read-write pointer.  In particular, this is the way that standard input and output
       files are passed and also how pipes are set up.

SEE ALSO

       wait(2), exec(2)

DIAGNOSTICS

       Returns -1 and fails to create a process if: there is inadequate swap space, the user is not super-user and has too many processes, or  the
       system's process table is full.	Only the super-user can take the last process-table slot.

ASSEMBLER

       (fork = 2.)
       sys fork
       (new process return)
       (old process return, new process ID in r0)

       The return locations in the old and new process differ by one word.  The C-bit is set in the old process if a new process could not be cre-
       ated.

																	   FORK(2)
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