How to limit the number of child processes Post: 302370511

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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

11-11-2009

Registered User

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.

xyzt

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LEARN ABOUT BSD

fork

FORK(3F)																  FORK(3F)

NAME

       fork - create a copy of this process

SYNOPSIS

       integer function fork()

DESCRIPTION

       Fork  creates  a  copy  of  the	calling  process.   The only distinction between the 2 processes is that the value returned to one of them
       (referred to as the `parent' process) will be the process id of the copy.  The copy is usually referred to as  the  `child'  process.   The
       value returned to the `child' process will be zero.

       All logical units open for writing are flushed before the fork to avoid duplication of the contents of I/O buffers in the external file(s).

       If the returned value is negative, it indicates an error and will be the negation of the system error code.  See perror(3F).

       A corresponding exec routine has not been provided because there is no satisfactory way to retain open logical units across the exec.  How-
       ever, the usual function of fork/exec can be performed using system(3F).

FILES

       /usr/lib/libU77.a

SEE ALSO

       fork(2), wait(3F), kill(3F), system(3F), perror(3F)

4.2 Berkeley Distribution					   May 27, 1986 							  FORK(3F)

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LEARN ABOUT BSD

fork