gh-103092: isolate _lsprof

[aisk]

The main change is moving the static variables random_value and random_stream in rotatingtree.c to a struct and storing it in the module's state.

Other changes are to pass the struct from the module's state.

• Issue: Isolate Stdlib Extension Modules #103092

[erlend-aasland]

Thanks; can you split out the Argument Clinic adaption and contribute that as a separate PR?

[aisk]

Sure, see #115242 .

[aisk]

Hi @erlend-aasland, I have a new thought. This change is just to isolate these two static variables:

cpython/Modules/rotatingtree.c

Lines 11 to 12 in 1a6e213

	staticunsigned intrandom_value=1;
	staticunsigned intrandom_stream=0;

But as they are the state of a pseudo-random generator, they can be shared between interpreters under a lock. For single interpreter usage, there is no noticeable performance decrease. And this work can be done easily.

I have no idea if this approach is acceptable, or whether we should continue with the previous work. If it does, I can do some benchmarking to see if there is a performance decrease in multiple isolated interpreters usage.

[erlend-aasland]

Sounds reasonable. Go ahead!

[erlend-aasland]

Superseded by #115301