multiple concurrent processes

[Philip Montgomery]

I am trying to figure out how to run process concurrently from Perl.  I want the 
parent to spawn off the children and wait until they are complete to continue.  I can 
get the child processes to run in serial, but I need them to run in parallel.

The code I am using thus far is

for ($x;$x<4;$x++) {
    if ($pid=fork) {
    } else {
   system "mkdir dir$x";
    for ($i=1;$i<250;$i++) {
        open3(OUTPUT, INPUT, ERRORS, cd dir$x;make clean; make all);
        <code to process the output of the make commands and store into log files>
    }
}    

Thanks for any help.

Phil