[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[Georg Brandl]

Change by Georg Brandl :


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nosy:  -georg.brandl

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[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

See also https://bugs.python.org/issue41571

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[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[Bar Harel]

Change by Bar Harel :


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[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[daniel hahler]

Change by daniel hahler :


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nosy: +blueyed

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[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[Attila-Mihaly Balazs]

Attila-Mihaly Balazs added the comment:

Absolutely this. While it is good that there is at least some documentation (at 
sys.settrace), it is not very explicit nor is it self evident that one should 
look there (for example the PDB docs don't even mention settrace).

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[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[Karl Richter]

Karl Richter added the comment:

Sorry, I mean 

#!/usr/bin/python

import threading

def debugging():
def __a_thread__():
print(2)
a_thread = threading.Thread(target=__a_thread__)
a_thread.start()
a_thread.join()
print(1)

if __name__ == __main__:
debugging()

It's very uncommon to set the current debugging thread in the source.

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[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[Karl Richter]

Karl Richter added the comment:

My initial description was imprecise. Clearification: The fact that in

#!/usr/bin/python

import threading

def debugging():
def __a_thread__():
print(2)
a_thread = threading.Thread(target=__a_thread__)
print(1)

if __name__ == __main__:
debugging()

when invoked with `python -m pdb` the breakpoint at line 7 is ignored, like in

$ python -m pdb multithreaded_debugging.py 
 
/mnt/DATA/richter/examples/python/multithreaded_debugging/multithreaded_debugging.py(3)module()
- import threading
(Pdb) break 7
Breakpoint 1 at 
/mnt/DATA/richter/examples/python/multithreaded_debugging/multithreaded_debugging.py:7
(Pdb) c
1
The program finished and will be restarted
 
/mnt/DATA/richter/examples/python/multithreaded_debugging/multithreaded_debugging.py(3)module()
- import threading
(Pdb)

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[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[Xavier de Gaye]

Xavier de Gaye added the comment:

pdb does not ignore breakpoints which are set and hit in a non-main thread.
For example with the attached script:

$ python pdb_thread.py
 pdb_thread.py(5)foo()
- lineno = 5
(Pdb) break 6
Breakpoint 1 at pdb_thread.py:6
(Pdb) continue
 pdb_thread.py(6)foo()
- lineno = 6
(Pdb) threading.current_thread().name
'fooThread'
(Pdb)

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Added file: http://bugs.python.org/file37668/pdb_thread.py

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[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[Xavier de Gaye]

Xavier de Gaye added the comment:

The pdb documentation could make an explicit reference to the documentation of 
sys.settrace() where it is explained that the function is thread specific.

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[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[Karl Richter]

New submission from Karl Richter:

Due to the fact that `pdb` currently simply ignores breakpoints which are set 
and hit in another than the main thread the docs need to contain a statement on 
behavior in a multithreaded environment.

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components: Library (Lib)
messages: 233409
nosy: krichter
priority: normal
severity: normal
status: open
title: pdb docs need to contain a statement on threads/multithreaded debugging
type: enhancement
versions: Python 3.5

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[issue23163] pdb docs need to contain a statement on threads/multithreaded debugging

[Ned Deily]

Changes by Ned Deily n...@acm.org:


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