--- a/xml/amazonBookSearch.php	Sun Jul 30 05:36:48 2017 -0400
+++ b/xml/amazonBookSearch.php	Sat Jan 05 06:21:12 2019 -0500
@@ -93,6 +93,23 @@
         curl_setopt ($crl, CURLOPT_ENCODING , "gzip");
 	curl_setopt ($crl, CURLOPT_RETURNTRANSFER, 1);
         curl_setopt ($crl, CURLOPT_CONNECTTIMEOUT, $timeout);
+	$gotit=0;
+	  $semaphore = new SyncSemaphore("Amazon");
+	  $gotit = $semaphore->lock(1000);
+          if (!$gotit) {
+	    file_put_contents('/var/ywww/debug/phpDebug',
+			      "Got it: ".(int)$gotit." 3\n",FILE_APPEND);
+	    $gotit=$semaphore->lock(1000);
+	    file_put_contents('/var/ywww/debug/phpDebug',
+			      "Got it: ".(int)$gotit." 3a\n",FILE_APPEND);
+	  }
         $ret = curl_exec($crl);
         curl_close($crl);
+        usleep(500000);
+	if ($gotit) {
+	  $semaphore->unlock();
+	}
+        else {
+	  file_put_contents('/var/ywww/debug/phpDebug',"W/o lock 3b\n",FILE_APPEND);
+        }
         echo $ret;