1) replaced elimateExcessiveSendBacklog with

requestMessageBytesPending and flush
2) Removed callback control guards from this interface

src/ca/nciu.h

@@ -217,12 +217,12 @@ private:
     ca_uint16_t typeCode;
     ca_uint8_t priority; 
     virtual void destroy (
-        epicsGuard < epicsMutex > & callbackControlGuard, 
         epicsGuard < epicsMutex > & mutualExclusionGuard );
     void initiateConnect (
         epicsGuard < epicsMutex > & );
-    void eliminateExcessiveSendBacklog ( 
-        epicsGuard < epicsMutex > * pCallbackGuard,
+    unsigned requestMessageBytesPending ( 
+        epicsGuard < epicsMutex > & mutualExclusionGuard );
+    void flush ( 
         epicsGuard < epicsMutex > & mutualExclusionGuard );
     ioStatus read ( 
         epicsGuard < epicsMutex > &,
@@ -241,7 +241,6 @@ private:
         unsigned type, arrayElementCount nElem, 
         unsigned mask, cacStateNotify &notify, ioid * );
     virtual void ioCancel ( 
-        epicsGuard < epicsMutex > & callbackControlGuard, 
         epicsGuard < epicsMutex > & mutualExclusionGuard,
         const ioid & );
     void ioShow ( 

src/ca/netiiu.cpp

@@ -129,8 +129,13 @@ void netiiu::flushRequest (
 {
 }
 
-void netiiu::eliminateExcessiveSendBacklog ( 
-    epicsGuard < epicsMutex > *,
+unsigned netiiu::requestMessageBytesPending ( 
+    epicsGuard < epicsMutex > & )
+{
+    return 0u;
+}
+
+void netiiu::flush ( 
     epicsGuard < epicsMutex > & )
 {
 }

src/ca/netiiu.h

@@ -47,8 +47,9 @@ public:
         epicsGuard < epicsMutex > & ) const = 0;
     virtual bool ca_v42_ok (
         epicsGuard < epicsMutex > & ) const = 0;
-    virtual void eliminateExcessiveSendBacklog ( 
-        epicsGuard < epicsMutex > * pCallbackGuard,
+    virtual unsigned requestMessageBytesPending ( 
+        epicsGuard < epicsMutex > & mutualExclusionGuard ) = 0;
+    virtual void flush ( 
         epicsGuard < epicsMutex > & mutualExclusionGuard ) = 0;
     virtual void writeRequest ( 
         epicsGuard < epicsMutex > &, nciu &, 

src/ca/noopiiu.cpp

@@ -116,11 +116,16 @@ void noopiiu::flushRequest (
     netiiu::flushRequest ( guard );
 }
 
-void noopiiu::eliminateExcessiveSendBacklog ( 
-    epicsGuard < epicsMutex > * pCBGuard,
+unsigned noopiiu::requestMessageBytesPending ( 
     epicsGuard < epicsMutex > & guard )
 {
-    netiiu::eliminateExcessiveSendBacklog ( pCBGuard, guard );
+    return netiiu::requestMessageBytesPending ( guard );
+}
+
+void noopiiu::flush ( 
+    epicsGuard < epicsMutex > & guard )
+{
+    netiiu::flush ( guard );
 }
 
 void noopiiu::requestRecvProcessPostponedFlush (

src/ca/noopiiu.h

@@ -39,8 +39,9 @@ public:
         epicsGuard < epicsMutex > & ) const;
     bool ca_v42_ok (
         epicsGuard < epicsMutex > & ) const;
-    void eliminateExcessiveSendBacklog ( 
-        epicsGuard < epicsMutex > * pCallbackGuard,
+    unsigned requestMessageBytesPending ( 
+        epicsGuard < epicsMutex > & mutualExclusionGuard );
+    void flush ( 
         epicsGuard < epicsMutex > & mutualExclusionGuard );
     void writeRequest ( 
         epicsGuard < epicsMutex > &, nciu &,