From 1006b642e78c2911450b5f3910e9aba50cde4802 Mon Sep 17 00:00:00 2001
From: skarg <skarg@1e814d3a-8a88-4260-be86-c0dc25669c1e>
Date: Mon, 9 Jan 2012 23:16:53 +0000
Subject: [PATCH] I was thinking that this might need to be done to separate
 the head from tail in case head is incremented by ISR while this is called.

---
 bacnet-stack/src/fifo.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/bacnet-stack/src/fifo.c b/bacnet-stack/src/fifo.c
index 5a95d949..a67ea65f 100755
--- a/bacnet-stack/src/fifo.c
+++ b/bacnet-stack/src/fifo.c
@@ -194,8 +194,11 @@ bool FIFO_Add(
 void FIFO_Flush(
     FIFO_BUFFER * b)
 {
+    unsigned head;        /* used to avoid volatile decision */
+
     if (b) {
-        b->tail = b->head;
+        head = b->head;
+        b->tail = head;
     }
 }