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    <p>See <a href="http://heather.cs.ucdavis.edu/~matloff/158/PLN/ParProcBook.pdf" rel="nofollow">http://heather.cs.ucdavis.edu/~matloff/158/PLN/ParProcBook.pdf</a>, there's a section on multithreaded debugging.</p> <pre> 3.6.1 Using PDB to Debug Threaded Programs Using PDB is a bit more complex when threads are involved. One cannot, for instance, simply do something like this: pdb.py buggyprog.py because the child threads will not inherit the PDB process from the main thread. You can still run PDB in the latter, but will not be able to set breakpoints in threads. What you can do, though, is invoke PDB from within the function which is run by the thread, by calling pdb.set trace() at one or more points within the code: import pdb pdb.set_trace() In essence, those become breakpoints. For example, in our program srvr.py in Section 3.1.1, we could add a PDB call at the beginning of the loop in serveclient(): while 1: import pdb pdb.set_trace() # receive letter from client, if it is still connected k = c.recv(1) if k == ’’: break You then run the program directly through the Python interpreter as usual, NOT through PDB, but then the program suddenly moves into debugging mode on its own. At that point, one can then step through the code using the n or s commands, query the values of variables, etc. PDB’s c (“continue”) command still works. Can one still use the b command to set additional breakpoints? Yes, but it might be only on a one-time basis, depending on the context. A breakpoint might work only once, due to a scope problem. Leaving the scope where we invoked PDB causes removal of the trace object. Thus I suggested setting up the trace inside the loop above. </pre>
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    1. POTrouble with Emacs pdb and breakpoints in multi-threaded Python code
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    1. USPierre-Antoine LaFayette
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    1. COA ha, a subtlety. I can confirm if I run the test program given in the question with import pdb; pdb.set_trace() at the head of the run() method, and then run it from the console, it does indeed break. BUT, how to get the integration with Emacs pdb (gud) session?
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      1. UScodeasone
    2. COHmm. There's may be an issue with the Emacs pdb integration. I couldn't say, I haven't tried it.
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      1. USPierre-Antoine LaFayette
 

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