fix testdbCaWaitForEvent()

sync with CA context thread(s) as well as dbCa worker.

modules/ca/src/client/access.cpp

@@ -717,6 +717,18 @@ int epicsStdCall ca_context_status ( ca_client_context * pcac, unsigned level )
     return ECA_NORMAL;
 }
 
+extern "C"
+LIBCA_API
+void dbCaSyncLocal(void);
+
+void dbCaSyncLocal(void)
+{
+    if(struct ca_client_context * ctxt = ca_current_context()) {
+        // bounce for access to private data member
+        ctxt->sync();
+    }
+}
+
 /*
  * ca_current_context ()
  *

modules/ca/src/client/ca_client_context.cpp

@@ -728,6 +728,12 @@ epicsMutex & ca_client_context::mutexRef () const
     return this->mutex;
 }
 
+void ca_client_context::sync()
+{
+    // bounce through vtable
+    this->pServiceContext->sync();
+}
+
 cacContext & ca_client_context::createNetworkContext (
     epicsMutex & mutexIn, epicsMutex & cbMutexIn )
 {

modules/ca/src/client/cac.cpp

@@ -398,6 +398,8 @@ void cac::flush ( epicsGuard < epicsMutex > & guard )
     }
 }
 
+void cac::sync() {}
+
 unsigned cac::circuitCount (
     epicsGuard < epicsMutex > & guard ) const
 {

modules/ca/src/client/cac.h

@@ -115,6 +115,7 @@ public:
 
     // IO management
     void flush ( epicsGuard < epicsMutex > & guard );
+    void sync ();
     bool executeResponse ( callbackManager &, tcpiiu &,
         const epicsTime & currentTime, caHdrLargeArray &, char *pMsgBody );
 

modules/ca/src/client/cacIO.h

@@ -279,6 +279,7 @@ public:
         cacChannel::priLev = cacChannel::priorityDefault ) = 0;
     virtual void flush (
         epicsGuard < epicsMutex > & ) = 0;
+    virtual void sync () = 0;
     virtual unsigned circuitCount (
         epicsGuard < epicsMutex > & ) const = 0;
     virtual void selfTest (

modules/ca/src/client/oldAccess.h

@@ -349,6 +349,7 @@ public:
     void destroyPutCallback ( epicsGuard < epicsMutex > &, putCallback & );
     void destroySubscription ( epicsGuard < epicsMutex > &, oldSubscription & );
     epicsMutex & mutexRef () const;
+    void sync();
 
     template < class T >
     void whenThereIsAnExceptionDestroySyncGroupIO ( epicsGuard < epicsMutex > &, T & );