matevfs.Context Thread tracking and cancellation object

## Synopsis

matevfs.Context get_cancellation check_cancellation cancel

## Description

## Methods

### matevfs.Context.get_cancellation

              get_cancellation

As far as I can tell, the python binding for this is incomplete.

### matevfs.Context.check_cancellation

              check_cancellation

Returns:

  `TRUE` if the context has been cancelled

Checks to see if this operation represented by this context has been cancelled.

### matevfs.Context.cancel

              cancel

Cancel the operation represented by this context.