Context for ProcessVariable instances. More...

#include <ProcessVariableContext.h>

Inheritance diagram for ProcessVariableContext:

Public Member Functions
	ProcessVariableContext ()
	Create the context. More...

virtual	~ProcessVariableContext ()
	Destructor. More...

OrderedMutex &	getMutex ()

void	attach (Guard &guard)
	Attach current thread to this context. More...

bool	isAttached (Guard &guard)

void	incRef (Guard &guard)
	Add another reference. More...

void	decRef (Guard &guard)
	Remove a reference. More...

size_t	getRefs (Guard &guard)

void	requestFlush (Guard &guard)
	Request a CA 'flush'. More...

bool	isFlushRequested (Guard &guard)

void	flush (Guard &guard)
	Perform the CA flush. More...

Detailed Description

Context for ProcessVariable instances.

ChannelAccess assigns PVs to contexts. This one helps to use the same context across threads, and keeps track of the required CA 'flush'.

Uses a reference count to check that all PVs were cleared by the time the context is destroyed.

Constructor & Destructor Documentation

ProcessVariableContext::ProcessVariableContext ( )

Create the context.

virtual ProcessVariableContext::~ProcessVariableContext ( )

virtual

Destructor.

Member Function Documentation

void ProcessVariableContext::attach ( Guard & guard )

Attach current thread to this context.

Except for the thread that created the context, all other threads that wish to use the context need to 'attach'. Unclear what happens when you don't, or when you attach more than once.

Exceptions

GenericException when detecting an error.

void ProcessVariableContext::decRef ( Guard & guard )

Remove a reference.

void ProcessVariableContext::flush ( Guard & guard )

Perform the CA flush.

Somebody, somehow should monitor 'isFlushRequested' and invoke 'flush' whenever requested.

OrderedMutex& ProcessVariableContext::getMutex ( )

virtual

See Also: Guardable

Implements Guardable.

size_t ProcessVariableContext::getRefs ( Guard & guard )

Returns: Returns current reference count.

void ProcessVariableContext::incRef ( Guard & guard )

Add another reference.

bool ProcessVariableContext::isAttached ( Guard & guard )

Returns: Returns 'true' if the current thread is attached.

See Also: attach()

bool ProcessVariableContext::isFlushRequested ( Guard & guard )

Returns: Returns true if a flush was requested.

void ProcessVariableContext::requestFlush ( Guard & guard )

Request a CA 'flush'.

A 'connect' or 'get' often only becomes effective after a 'flush', but we don't want to 'flush' after every such operation because that would degrade performance. So this call requests a flush at a later time.

See Also: flush()

The documentation for this class was generated from the following file:

/home/malitsky/projects/epics-archiver/sourceforge/trunk/ea4-cpp/include/common/engine/ProcessVariableContext.h

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation