add some tracing

ext/mysqlnd/mysqlnd.c

@@ -1225,6 +1225,7 @@ MYSQLND_METHOD(mysqlnd_conn_data, reap_query)(MYSQLND_CONN_DATA * conn TSRMLS_DC
 
 #include "php_network.h"
 
+/* {{{ mysqlnd_stream_array_to_fd_set */
 MYSQLND ** mysqlnd_stream_array_check_for_readiness(MYSQLND ** conn_array TSRMLS_DC)
 {
 	int cnt = 0;
@@ -1255,15 +1256,17 @@ MYSQLND ** mysqlnd_stream_array_check_for_readiness(MYSQLND ** conn_array TSRMLS
 	}
 	return ret;
 }
+/* }}} */
 
 
-/* {{{ stream_select mysqlnd_stream_array_to_fd_set functions */
+/* {{{ mysqlnd_stream_array_to_fd_set */
 static int mysqlnd_stream_array_to_fd_set(MYSQLND ** conn_array, fd_set * fds, php_socket_t * max_fd TSRMLS_DC)
 {
 	php_socket_t this_fd;
 	php_stream *stream = NULL;
-	int cnt = 0;
+	unsigned int cnt = 0;
 	MYSQLND **p = conn_array;
+	DBG_ENTER("mysqlnd_stream_array_to_fd_set");
 
 	while (*p) {
 		/* get the fd.
@@ -1272,6 +1275,7 @@ static int mysqlnd_stream_array_to_fd_set(MYSQLND ** conn_array, fd_set * fds, p
 		 * is not displayed.
 		 * */
 		stream = (*p)->data->net->data->m.get_stream((*p)->data->net TSRMLS_CC);
+		DBG_INF_FMT("conn=%llu stream=%p", (*p)->data->thread_id, stream);
 		if (stream != NULL && SUCCESS == php_stream_cast(stream, PHP_STREAM_AS_FD_FOR_SELECT | PHP_STREAM_CAST_INTERNAL,
 										(void*)&this_fd, 1) && this_fd >= 0) {
 
@@ -1284,21 +1288,24 @@ static int mysqlnd_stream_array_to_fd_set(MYSQLND ** conn_array, fd_set * fds, p
 		}
 		p++;
 	}
-	return cnt ? 1 : 0;
+	DBG_RETURN(cnt ? 1 : 0);
 }
+/* }}} */
+
 
+/* {{{ mysqlnd_stream_array_from_fd_set */
 static int mysqlnd_stream_array_from_fd_set(MYSQLND ** conn_array, fd_set * fds TSRMLS_DC)
 {
 	php_socket_t this_fd;
 	php_stream *stream = NULL;
 	int ret = 0;
 	zend_bool disproportion = FALSE;
-
-
 	MYSQLND **fwd = conn_array, **bckwd = conn_array;
+	DBG_ENTER("mysqlnd_stream_array_from_fd_set");
 
 	while (*fwd) {
 		stream = (*fwd)->data->net->data->m.get_stream((*fwd)->data->net TSRMLS_CC);
+		DBG_INF_FMT("conn=%llu stream=%p", (*fwd)->data->thread_id, stream);
 		if (stream != NULL && SUCCESS == php_stream_cast(stream, PHP_STREAM_AS_FD_FOR_SELECT | PHP_STREAM_CAST_INTERNAL,
 										(void*)&this_fd, 1) && this_fd >= 0) {
 			if (PHP_SAFE_FD_ISSET(this_fd, fds)) {
@@ -1316,7 +1323,7 @@ static int mysqlnd_stream_array_from_fd_set(MYSQLND ** conn_array, fd_set * fds
 	}
 	*bckwd = NULL;/* NULL-terminate the list */
 
-	return ret;
+	DBG_RETURN(ret);
 }
 /* }}} */