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src/db/dbSubscriptionIO.cpp

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+
+/*  
+ *  $Id$
+ *
+ *                              
+ *                    L O S  A L A M O S
+ *              Los Alamos National Laboratory
+ *               Los Alamos, New Mexico 87545
+ *                                  
+ *  Copyright, 1986, The Regents of the University of California.
+ *                                  
+ *           
+ *	Author Jeffrey O. Hill
+ *	johill@lanl.gov
+ *	505 665 1831
+ */
+
+#include "limits.h"
+
+#include "osiMutex.h"
+#include "tsFreeList.h"
+
+#include "cadef.h"
+#include "cacIO.h"
+
+#define epicsExportSharedSymbols
+#include "dbCAC.h"
+#include "db_access_routines.h"
+
+tsFreeList < dbSubscriptionIO > dbSubscriptionIO::freeList;
+
+dbSubscriptionIO::dbSubscriptionIO ( dbChannelIO &chanIO, 
+    cacNotify &notifyIn, unsigned typeIn, unsigned long countIn ) :
+    cacNotifyIO ( notifyIn ), chan ( chanIO ), es ( 0 ), 
+        type ( typeIn ), count ( countIn )
+{
+}
+
+dbSubscriptionIO::~dbSubscriptionIO ()
+{
+    if ( this->es ) {
+        db_cancel_event ( this->es );
+    }
+}
+
+void dbSubscriptionIO::destroy ()
+{
+    delete this;
+}
+
+void * dbSubscriptionIO::operator new ( size_t size )
+{
+    return dbSubscriptionIO::freeList.allocate ( size );
+}
+
+void dbSubscriptionIO::operator delete ( void *pCadaver, size_t size )
+{
+    dbSubscriptionIO::freeList.release ( pCadaver, size );
+}
+
+extern "C" void dbSubscriptionEventCallback ( void *pPrivate, struct dbAddr *paddr,
+	int eventsRemaining, struct db_field_log *pfl )
+{
+    dbSubscriptionIO *pIO = static_cast <dbSubscriptionIO *> ( pPrivate );
+    pIO->chan.subscriptionUpdate ( pIO->type, pIO->count, pfl, *pIO);
+}
+
+int dbSubscriptionIO::begin ( struct dbAddr &addr, unsigned mask )
+{
+    if ( this->type > INT_MAX ) {
+        return ECA_BADCOUNT;
+    }
+    if ( this->count > INT_MAX ) {
+        return ECA_BADCOUNT;
+    }
+    this->es = this->chan.subscribe ( *this, mask );
+    if ( this->es ) {
+        return ECA_NORMAL;
+    }
+    else {
+        return ECA_ALLOCMEM;
+    }
+}
+