function lx_core_lock($file = null)
{
global $argv;
$prog = basename($argv[0]);
// This is a hack.. If we can't get the arg, then that means we are in the cgi mode, and that means our process name is display.php.
if (!$prog) {
$prog = "display.php";
}
lxfile_mkdir("../pid");
if (!$file) {
$file = "{$prog}.pid";
} else {
$file = basename($file);
}
$pidfile = "__path_program_root/pid/{$file}";
$pid = null;
if (lxfile_exists($pidfile)) {
$pid = lfile_get_contents($pidfile);
}
dprint($pid . "\n");
if (!$pid) {
dprint("{$prog}:{$file} No pid file {$pidfile} detected..\n");
lfile_put_contents($pidfile, os_getpid());
return false;
}
$pid = trim($pid);
$name = os_get_commandname($pid);
if ($name) {
$name = basename($name);
}
if (!$name || $name !== $prog) {
if (!$name) {
dprint("{$prog}:{$file} Stale Lock file {$pidfile} detected..., removing\n");
} else {
dprint("{$prog}:{$file} Stale lock file... Another program {$name} is running on it..\n");
}
lxfile_rm($pidfile);
lfile_put_contents($pidfile, os_getpid());
return false;
}
return true;
}
function save_pid($name)
{
lfile_put_contents("__path_program_root/pid/{$name}.pid", os_getpid());
}
