--- a/php/read/getBookDetails.php	Thu Oct 25 09:40:25 2018 -0400
+++ b/php/read/getBookDetails.php	Thu Oct 25 09:42:12 2018 -0400
@@ -204,16 +204,35 @@
 		curl_setopt ($crl, CURLOPT_ENCODING , "gzip"); 
 		curl_setopt ($crl, CURLOPT_RETURNTRANSFER, 1);
 		curl_setopt ($crl, CURLOPT_CONNECTTIMEOUT, $timeout);
+  	        $gotit=0;
+		$requestIP = $_SERVER['REMOTE_ADDR'];
+		$semaphore = new SyncSemaphore("Amazon");
+		$gotit = $semaphore->lock(4000);
+		if (!$gotit) {
+		  file_put_contents('/var/ywww/debug/phpDebug',
+           	  "Got it: ".(int)$gotit." $requestIP 2\n",FILE_APPEND);
+		  $gotit=$semaphore->lock(5000);
+		  file_put_contents('/var/ywww/debug/phpDebug',
+		    "Got it: ".(int)$gotit." $requestIP 2a\n",FILE_APPEND);
+		}
 		$out = curl_exec($crl);
 		curl_close($crl);
-
+		usleep(1000000);
+		if ($gotit) {
+		  $semaphore->unlock();
+		}
+		else {
+		  file_put_contents('/var/ywww/debug/phpDebug',
+				    "W/o lock for $requestIP 2b\n",FILE_APPEND);
+		}
 		//echo $out;
 		
 		if (preg_match("<Error>",$out)) {
 		  $xml = new SimpleXMLElement($out);	
 		  $resName=$xml->getName();
 		  $code=$xml->Error->Code;
-		  file_put_contents('/var/ywww/debug/phpDebug',"Losing gBD: $resName, $code\n",FILE_APPEND);
+		  $requestIP = $_SERVER['REMOTE_ADDR'];
+		  file_put_contents('/var/ywww/debug/phpDebug',"Losing gBD: $resName, $code, $requestIP\n",FILE_APPEND);
 		  if ($code=='RequestThrottled') {
 		    usleep(200000); // Try to reduce throttling until we get a 
 		    // principled solution in place