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> I.e.: something as adding a thread_id to sys.settrace -- sys.settrace(trace_func, thread_id=None).
What is the use case for this feature?
It seems quite complicated to implement the thread_id for sys.settrace(trace_func, thread_id=None).
Currently, there is no way for a thread to execute code directly in another thread. In asyncio, it has to through call_soon_threadsafe() which queues the function calls and the function is called "later" and the caller doesn't get the result.
https://docs.python.org/dev/library/asyncio-eventloop.html#asyncio.loop.call_soon_threadsafe
sys.setprofile() and sys.settrace() use the current Python thread state (tstate). The threading.enumerate() function returns threading.Thread instances, but it's not currently possible to get the Python thread state (C structure PyThreadState) from a Python threading.Thread object.
At the C level, Python doesn't maintain a list of thread. There is only threading.enumerate() which is implemented in Python.
PyDev.Debugger seems to use the C API. Can it continue to use the C API?
Note: There is threading.setprofile() and threading.settrace() which set a profile/trace function when *new* threads are spawned.