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copied!<p>Here's some code that may be useful.</p> <pre><code><? define('WANT_PROCESSORS', 5); define('PROCESSOR_EXECUTABLE', '/path/to/your/processor'); set_time_limit(0); $cycles = 0; $run = true; $reload = false; declare(ticks = 30); function signal_handler($signal) { switch($signal) { case SIGTERM : global $run; $run = false; break; case SIGHUP : global $reload; $reload = true; break; } } pcntl_signal(SIGTERM, 'signal_handler'); pcntl_signal(SIGHUP, 'signal_handler'); function spawn_processor() { $pid = pcntl_fork(); if($pid) { global $processors; $processors[] = $pid; } else { if(posix_setsid() == -1) die("Forked process could not detach from terminal\n"); fclose(stdin); fclose(stdout); fclose(stderr); pcntl_exec(PROCESSOR_EXECUTABLE); die('Failed to fork ' . PROCESSOR_EXECUTABLE . "\n"); } } function spawn_processors() { global $processors; if($processors) kill_processors(); $processors = array(); for($ix = 0; $ix < WANT_PROCESSORS; $ix++) spawn_processor(); } function kill_processors() { global $processors; foreach($processors as $processor) posix_kill($processor, SIGTERM); foreach($processors as $processor) pcntl_waitpid($processor); unset($processors); } function check_processors() { global $processors; $valid = array(); foreach($processors as $processor) { pcntl_waitpid($processor, $status, WNOHANG); if(posix_getsid($processor)) $valid[] = $processor; } $processors = $valid; if(count($processors) > WANT_PROCESSORS) { for($ix = count($processors) - 1; $ix >= WANT_PROCESSORS; $ix--) posix_kill($processors[$ix], SIGTERM); for($ix = count($processors) - 1; $ix >= WANT_PROCESSORS; $ix--) pcntl_waitpid($processors[$ix]); } elseif(count($processors) < WANT_PROCESSORS) { for($ix = count($processors); $ix < WANT_PROCESSORS; $ix++) spawn_processor(); } } spawn_processors(); while($run) { $cycles++; if($reload) { $reload = false; kill_processors(); spawn_processors(); } else { check_processors(); } usleep(150000); } kill_processors(); pcntl_wait(); ?> </code></pre>

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