[Rd] Interrupting C++ code execution

[Thomas Friedrichsmeier]

On Monday 25 April 2011, Simon Urbanek wrote:
> Actually, it just came to me that there is a hack you could use. The
> problem with it is that it will eat all errors, even if they were not
> yours (e.g. those resulting from events triggered the event loop), so I
> would not recommend it for general use.

Here's another option which is probably not recommendable for general use, 
since it is not part of the documented API:

On Windows you can look at the variable "UserBreak", available from 
Rembedded.h. Outside of Windows, you can look at R_interrupts_pending, 
available from R_ext/GraphicsDevice.h. R_ext/GraphicsDevice.h also has 
R_interrupts_suspended, which you may or may not want to take into account, 
depending on your use-case.

BTW, being able to check for a pending interrupt or to schedule an interrupt 
from a separate thread is something that can come in handy in GUI development 
as well, and personally, I would appreciate, if there was some slightly more 
official support for this.

Regards
Thomas
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