From c69450ec04fe8ba428a761963408941defc0916c Mon Sep 17 00:00:00 2001
From: Glenn Strauss <gstrauss@gluelogic.com>
Date: Sun, 25 Jul 2021 23:12:56 -0400
Subject: [PATCH] [core] free fdwaitqueue list when empty

fdwaitqueue is typically unused except in severe overload conditions,
so free up the list storage as soon as it is empty
---
 src/server.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/server.c b/src/server.c
index 61f6cdd3..4c791d25 100644
--- a/src/server.c
+++ b/src/server.c
@@ -1065,8 +1065,14 @@ static void server_process_fdwaitqueue (server *srv) {
         if (i == fdwaitqueue->used) break;
         connection_state_machine(fdwaitqueue->ptr[i++]);
     }
-    if (i > 0 && 0 != (fdwaitqueue->used -= i)) {
-	memmove(fdwaitqueue->ptr, fdwaitqueue->ptr+i, fdwaitqueue->used * sizeof(*(fdwaitqueue->ptr)));
+    if (0 == (fdwaitqueue->used -= i)) {
+        free(fdwaitqueue->ptr);
+        fdwaitqueue->ptr = NULL;
+        fdwaitqueue->size = 0;
+    }
+    else if (i > 0) {
+        memmove(fdwaitqueue->ptr, fdwaitqueue->ptr+i,
+                fdwaitqueue->used * sizeof(*(fdwaitqueue->ptr)));
     }
 }