/**
* Wait for the processes started via call().
*
* @param int $pid The pid to wait for, if none is passed then all threads created by this object will be waited for
*
* @return void
*/
public function wait($pid = null)
{
if ($pid) {
$threads = [$pid];
} else {
$threads = $this->threads;
}
$error = 0;
$status = 0;
foreach ($threads as $pid) {
$status = $this->adapter->wait($pid);
if ($status > 0) {
$error = $status;
}
unset($this->threads[$pid]);
}
# If no errors occured then we're done
if ($error === 0) {
return;
}
$exceptions = $this->adapter->getExceptions();
$message = "An error occurred within a thread, the return code was: {$error}\n";
foreach ($exceptions as $exception) {
$message .= " - {$exception}\n";
}
throw new Exception($message, $error);
}