From cb47f32517727ab9585669e344daf3fe14fb8d1c Mon Sep 17 00:00:00 2001
From: Marty Kraimer <mrkraimer@comcast.net>
Date: Thu, 25 Aug 2005 13:07:41 +0000
Subject: [PATCH] add test for null tid

---
 src/libCom/taskwd/taskwd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/libCom/taskwd/taskwd.c b/src/libCom/taskwd/taskwd.c
index dbd5f0608..4f38b7a79 100644
--- a/src/libCom/taskwd/taskwd.c
+++ b/src/libCom/taskwd/taskwd.c
@@ -85,6 +85,10 @@ void epicsShareAPI taskwdInsert(epicsThreadId tid,TASKWDFUNCPRR callback,void *a
     struct task_list *pt;
 
     taskwdInit();
+    if(tid==0) {
+       errlogPrintf("taskwdInsert called with null tid\n");
+       return;
+    }
     epicsMutexMustLock(lock);
     pt = allocList();
     ellAdd(&list,(void *)pt);