Hey,
I’m debugging a devious issue, which I suspect to be a bug in either UHD or the UHD USRP Sink, but before I write the proper bug report I wanted to check with the pros if I’m using GNURadio correctly in the first place.
Tl;dr: how do I properly and fully close/destroy a flowgraph from Python, without killing the Python instance?
I’m creating a flowgraph from a Python loop, execute it, and destroy it. I’ve tried the following ideas: call stop and wait, then either set reference variable to None, or calling the destructor explicitly – essentially this:
<begin loop>
tb = top_block_constructor(<…>)
tb.start()
[…]
tb.stop()
tb.wait()
tb = None # OR:
del tb # Neither of this works as I would expect
<end loop>
The main problem I’m encountering is that the flow graph is not fully torn down and recreated in each iteration, instead it appears to keep _some_ parts referenced. The easiest way to see this is by setting one of the block’s minoutbuf variables to a nonzero value and observe the log output. At a certain point, this may look like this (emphasis mine)
selector :info: set_min_output_buffer on block 12665 to 16360
the following loop iteration it is
selector :info: set_min_output_buffer on block 12678 to 16360
For my flowgraph, which is pretty simple, this leads to a reproducible Python interpreter(!) crash after 1002-1004 iterations:
selector :info: set_min_output_buffer on block 13016 to 16360
interleaved_short_to_complex :info: set_min_output_buffer on block 13018 to 56000000
Fatal Python error: _PyGILState_NoteThreadState: Couldn't create autoTSSkey mapping
Python runtime state: initialized
Thread 0x00007eff7ffff700 (most recent call first):
<no Python frame>
Thread 0x00007f01b366a740 (most recent call first):
File "/home/<username>/radioconda/lib/python3.11/threading.py", line 629 in wait
File "/home/<username>/radioconda/lib/python3.11/threading.py", line 969 in start
File "/home/<username>/rfitester/ClientBase.py", line 68 in run
File "/home/<username>/radioconda/lib/python3.11/threading.py", line 327 in wait
File "/home/<username>/rfitester/./RFIController.py", line 160 in <module>
[1] 629642 abort ./RFIController.py <CLI parameters>
Thanks for your help!
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