upgraded ipAddrToAscii API and improved shutdown procedures

src/ca/cac.cpp

@@ -136,11 +136,11 @@ extern "C" void cacOnceFunc ( void * )
 // cac::cac ()
 //
 cac::cac ( cacNotify & notifyIn ) :
-    ipToAEngine ( "dnsQuery" ), 
     programBeginTime ( epicsTime::getCurrent() ),
     connTMO ( CA_CONN_VERIFY_PERIOD ),
     cbMutex ( notifyIn ),
     globalServiceList ( globalServiceListCAC.getReference () ),
+    ipToAEngine ( ipAddrToAsciiEngine::allocate () ),
     timerQueue ( epicsTimerQueueActive::allocate ( false, 
         lowestPriorityLevelAbove(epicsThreadGetPrioritySelf()) ) ),
     pUserName ( 0 ),
@@ -299,6 +299,8 @@ cac::~cac ()
 
     this->timerQueue.release ();
 
+    this->ipToAEngine.release ();
+
     errlogFlush ();
 
     // its ok for channels and subscriptions to still
@@ -554,8 +556,9 @@ bool cac::transferChanToVirtCircuit (
                 char acc[64];
                 pChan->getPIIU()->hostName ( acc, sizeof ( acc ) );
                 msgForMultiplyDefinedPV * pMsg = new ( this->mdpvFreeList )
-                    msgForMultiplyDefinedPV ( *this, pChan->pName (), acc, addr );
-                pMsg->ioInitiate ( this->ipToAEngine );
+                    msgForMultiplyDefinedPV ( this->ipToAEngine, 
+                        *this, pChan->pName (), acc );
+                pMsg->ioInitiate ( addr );
             }
             return false;
         }

src/ca/cac.h

@@ -193,7 +193,6 @@ public:
 
 private:
     localHostName hostNameCache;
-    ipAddrToAsciiEngine ipToAEngine;
     cacServiceList services;
     chronIntIdResTable < nciu > chanTable;
     //
@@ -242,6 +241,7 @@ private:
     epicsSingleton 
         < cacServiceList >::reference
             globalServiceList;
+    ipAddrToAsciiEngine  & ipToAEngine;
     epicsTimerQueueActive & timerQueue;
     char * pUserName;
     class udpiiu * pudpiiu;