From: R. Steve McKown <rsmckown@gmail.com>
Date: Mon, 19 Apr 2010 22:13:15 +0000 (-0600)
Subject: Fix possible overwrite of state changes make in a component's Init.init()
X-Git-Tag: patchset/2.1.1-4.4~7
X-Git-Url: https://oss.titaniummirror.com/gitweb/?p=tinyos-2.x.git;a=commitdiff_plain;h=728960e56f2ef3e1562df1b737caa29556776d9d

Fix possible overwrite of state changes make in a component's Init.init()

If a component using State and providing Init is wired to MainC.SoftwareInit,
the component cannot reliably call State.forceState() inside its Init.init().
If ncc renders MainC.SoftwareInit.Init()'s fanout calling the component's
Init.init() before StateImplP's Init.init(), the latter sets the state[] array
members all to zero (S_IDLE), undoing any state change the component may have
attempted.

The easy fix is to remove the extra initiation of state[] in StateImplP's
Init.init().  Becuase state[] is a static, its elements are guaranteed to have
values of zero (S_IDLE).
---

diff --git a/tos/system/StateImplP.nc b/tos/system/StateImplP.nc
index 3883ac15..edcde832 100644
--- a/tos/system/StateImplP.nc
+++ b/tos/system/StateImplP.nc
@@ -79,10 +79,6 @@ implementation {
 
   /***************** Init Commands ****************/
   command error_t Init.init() {
-    int i;
-    for(i = 0; i < uniqueCount(UQ_STATE); i++) {
-      state[i] = S_IDLE;
-    }
     return SUCCESS;
   }