C++ constructor

Destructor.

Add new listener tail index. Index is initialized to KSensrvChannelBufferUninitializedTail, if there is an outstanding request for data block, or iHeadIndex if not. This is done so that first write of data will be ignored, as it was generated before listening started for this listener.

Called by server thread.

Cancels any outstanding free block request Called by SSY thread.

2nd phase of construction

Gets data for condition evaluation and resets condition tail to head index.

Gets pointer to next free block of n items. Adjusts indexes accordingly. Called by SSY thread.

Gets the initial data item that can be sent to new listerers if there is no data available by GetMessageData(). Called by server thread.

Gets data for transaction and adjusts listener tail accordingly. Data written can be less than the specified count, if there is less data available. Called by server thread.

Gets tail index for listener.

Invalidates range of items starting from head index. Adjusts valid and tail indexes accordingly.

Gets buffer length Called from server thread

Two phase constructor

Removes a listener tail index. Called by server thread.

Checks how much new data is available for listener. If there is no data amount change, no update is needed.

Validates block of n items starting from the head index. Adjusts indexes accordingly. Called by SSY thread.

Actual buffer. Own.

Number of items buffer can hold.

Indicates cell where SSY will be writing next.

Single buffered data item size

Index of the latest written data item or KErrNotFound. The item located at this index can be sent to new listeners as initial data if there is nothing else to sent.

Indicates the length of free block that has been requested.

Array of listener tail indexes

Indicates first invalid data cell after continuous valid cells. If iHeadIndex == iValidEndIndex, valid buffer space is continuous. If iHeadIndex < iValidEndIndex, buffer has wrapped around.