How to identify threads started by mORMot server?

edwinsn · 2018-12-14 06:57:36

Assuming in a desktop program we have a mORMot server and a bunch of clients.
There will be 2 types of background threads in the program:
A - the server threads started by mORMot server when serving client requests.
B - the other ordinary threads started by the program.

The question is how to distinguish A from B?
I need this info to make sure the mORMot engine will log ONLY errors caused by the engine /db itself, but not errors caused in my other ordinary threads, by utilizing `SQLite3Log.Family.OnBeforeException`.

This is kind of a continued discussion of To allow ignoring exceptions with code, but I decided to post it separately to make things clearer.

Thanks.

ab · 2018-12-14 09:00:23

Every thread is named.
I have added aThreadName parameter to TSynLogFamily.OnBeforeException callback.
See https://synopse.info/fossil/info/80a92148c9

So you should be able to identify the thread context it runs on by checking the name.
Note that depending on the communication mean used (socket/http.sys/pipe), the thread names won't be the same.

Another (perhaps easier) option may be to define a global boolean threadvar, then set it to true on the withException threads.

edwinsn · 2018-12-14 14:30:04

Great! Thanks for your quick reaction, as aways

But how the mMORMot threads are named? Do they have a fixed prefix or something like that? I did a quick look at the source without a successful finding... Thanks.

Last edited by edwinsn (2018-12-14 14:32:40)

ab · 2018-12-14 16:27:03

Enable the logs, and you will find the thread names at the start of each thread, and in the LogView tool, in the "Thread" list.

edwinsn · 2018-12-16 13:07:19

@ab,
Done as you instructed, see attached screenshot, not sure how to interpret the names...

And I explored the source and found:

constructor TSQLRestThread.Create(aRest: TSQLRest;
  aOwnRest, aCreateSuspended: boolean);
begin
...
  if fThreadName='' then
    FormatUTF8('% %',[self,fRest.Model.Root],fThreadName);
...
end;

So is TSQLRestThread.Create where the mORMot server threads are created and named?

Thanks.

ab · 2018-12-16 16:52:58

Your sample doesn't have any server thread.

Enable the logs on a http server application, and you will see.

edwinsn · 2018-12-17 02:56:34

Ah yes! Discovered log entries such as "SetThreadName 000026BC=TSQLHttpServer 80/root THttpApiServer". Thanks.

mORMot Open Source

#1 2018-12-14 06:57:36

How to identify threads started by mORMot server?

#2 2018-12-14 09:00:23

Re: How to identify threads started by mORMot server?

#3 2018-12-14 14:30:04

Re: How to identify threads started by mORMot server?

#4 2018-12-14 16:27:03

Re: How to identify threads started by mORMot server?

#5 2018-12-16 13:07:19

Re: How to identify threads started by mORMot server?

#6 2018-12-16 16:52:58

Re: How to identify threads started by mORMot server?

#7 2018-12-17 02:56:34

Re: How to identify threads started by mORMot server?

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