mORMot Open Source

leus

Member

Registered: 2012-09-05

Posts: 79

TimerEnable - does it run in parallel, or in a queue?

I've looked at the TimerEnable code but I'm not sure if I'm following - if a process takes some time, and the timer is short, what happens? Is the timer callback called immediately, or it is enqueued until the already running process finishes?

Thanks,

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,655

Website

Re: TimerEnable - does it run in parallel, or in a queue?

There is a background thread, which wakes up every second and run all the tasks in the queue, in the given period of time.
So if a process takes a lot of time, it would be executed in this single thread, so other tasks in the queue will wait for their execution.
Therefore, it is not a good idea for a task to take more than a few dozen milliseconds - unless it is what you expect.
Note that you can create as many background thread as needed. This is one in each TSQLRest/TRest instance, but you can create others.

You can run a task immediately by setting the corresponding flag to "true" when you setup the task.