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thomas dot nicolai at unisg dot ch ¶
19 years ago
The code before isnt working for me cause the children are correctly started but not refreshed after they died. So keep in mind to use this instead and use the signal handler to know when a child exits to know when you have to start a new one. I added a few lines to the posting from {andy at cbeyond dot net} cause his post wasnt working for me as well (PHP5.1). Same effect like the one below.

<?php
declare(ticks = 1);

$max=5;
$child=0;

// function for signal handler
function sig_handler($signo) {
  global $child;
  switch ($signo) {
   case SIGCHLD:
     echo "SIGCHLD received\n";
     $child--;
  }
}

// install signal handler for dead kids
pcntl_signal(SIGCHLD, "sig_handler");

while (1){
       $child++;
       $pid=pcntl_fork();
       
       if ($pid == -1) {
               die("could not fork");
       } else if ($pid) {
               
               // we are the parent
               if ( $child >= $max ){
                   pcntl_wait($status);
                   $child++;
               }
       } else {
               // we are the child
               echo "\t Starting new child | now we de have $child child processes\n";
               // presumably doing something interesting
               sleep(rand(3,5));
               exit;
       }
}
?>
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