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#!/usr/bin/php
<?php
// This is an experimental multiprocess update daemon
// It consists of the master server (this file) and
// client batch script (update_daemon2_client.php) which
// should only be run by the server process
declare(ticks = 1);
require "config.php";
define('MAX_JOBS', 2);
define('CLIENT_PROCESS', './update_daemon2_client.php SRV_RUN_OK');
define('SPAWN_INTERVAL', DAEMON_SLEEP_INTERVAL);
$running_jobs = 0;
$last_checkpoint = -1;
function sigchld_handler($signal) {
global $running_jobs;
if ($running_jobs > 0) $running_jobs--;
print posix_getpid() . ": SIGCHLD received, jobs left: $running_jobs\n";
pcntl_waitpid(-1, $status, WNOHANG);
}
pcntl_signal(SIGCHLD, 'sigchld_handler');
while (true) {
$next_spawn = $last_checkpoint + SPAWN_INTERVAL - time();
print "[MASTER] active jobs: $running_jobs, next spawn at $next_spawn sec\n";
if ($last_checkpoint + SPAWN_INTERVAL < time()) {
for ($j = $running_jobs; $j < MAX_JOBS; $j++) {
print "[MASTER] spawning client $j...";
$pid = pcntl_fork();
if ($pid == -1) {
die("fork failed!\n");
} else if ($pid) {
$running_jobs++;
print "OK [$running_jobs]\n";
} else {
pcntl_signal(SIGCHLD, SIG_IGN);
passthru(CLIENT_PROCESS);
exit(0);
}
}
$last_checkpoint = time();
}
sleep(1);
}
?>
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