Apply old PR 189

Closes chrisboulton/php-resque#189

Author: danhunsaker

lib/Resque/Worker.php

@@ -257,7 +257,14 @@ public function work($interval = Resque::DEFAULT_INTERVAL, $blocking = false)
 				$this->logger->log(Psr\Log\LogLevel::INFO, $status);
 
 				// Wait until the child process finishes before continuing
-				pcntl_wait($status);
+				while (pcntl_wait($status, WNOHANG) === 0) {
+					if(function_exists('pcntl_signal_dispatch')) {
+			            pcntl_signal_dispatch();
+			        }
+
+					// Pause for a half a second to conserve system resources
+					usleep(500000);
+				}
 
 				if (pcntl_wifexited($status) !== true) {
 					$job->fail(new Resque_Job_DirtyExitException('Job exited abnormally'));