From fcc2e7c301fe39960c3b7da49686cfa4e000f294 Mon Sep 17 00:00:00 2001
From: scipio <scipio>
Date: Sat, 16 Feb 2008 01:31:50 +0000
Subject: [PATCH] Signal changed() on change().

---
 tos/lib/net/drip/DisseminatorP.nc | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tos/lib/net/drip/DisseminatorP.nc b/tos/lib/net/drip/DisseminatorP.nc
index 1dff2394..b9584fcd 100644
--- a/tos/lib/net/drip/DisseminatorP.nc
+++ b/tos/lib/net/drip/DisseminatorP.nc
@@ -80,7 +80,9 @@ implementation {
   }
 
   command void DisseminationValue.set( const t* val ) {
-    valueCache = *val;
+    if (seqno == DISSEMINATION_SEQNO_UNKNOWN) {
+      valueCache = *val;
+    }
   }
 
   command void DisseminationUpdate.change( t* newVal ) {
@@ -105,7 +107,11 @@ implementation {
 					     uint32_t newSeqno ) {
     memcpy( &valueCache, data, size < sizeof(t) ? size : sizeof(t) );
     seqno = newSeqno;
-    post changedTask();
+    // We need to signal here and can't go through a task to
+    // ensure that the update and changed event are atomic.
+    // Otherwise, it is possible that storeData is called,
+    // but before the task runs, the client calls set(). -pal
+    signal DisseminationValue.changed();
   }
 
   command uint32_t DisseminationCache.requestSeqno() {
-- 
2.39.2