Re: Timeouts in Ada

[NiGHTS <nights@unku.us>]

On Thursday, July 17, 2014 5:48:56 AM UTC-4, Dmitry A. Kazakov wrote:
> 
> The example is quite unrealistic. If the DB client supported asynchronous
> 
> requests, then it would be very unlikely polling. Any reasonably designed
> 
> client would use some waitable OS object instead, i.e. waiting will be
> 
> non-busy.
> 

I've dealt with many database libraries which provide both blocking and non-blocking queries. The logic behind this is that the blocking function is best used in a dedicated query thread whereas non-blocking is typically used in a single-threaded model where the main process checks up on the state of the query object while it takes care of other things, perhaps updating a progress bar or some other task.

I tend to prefer non-blocking processes like this so I can set my own blocking priority (for instance usleep(250000)). I feel its more portable and manageable to control the block myself. 

Thank you for your answers. They have been very insightful.