[issue21281] DEBUGGING: Simultaneous stopping of all threads on breakpoint and switching between threads

[daniel hahler]

Change by daniel hahler :


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nosy: +blueyed

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[issue21281] DEBUGGING: Simultaneous stopping of all threads on breakpoint and switching between threads

[daniel hahler]

daniel hahler  added the comment:

This is a good idea.

I am currently leaning towards using a threading.Lock around `Pdb.interaction`, 
or `pdb.set_trace` with pdb++.

This would at least mitigate the issue where `pdb.set_trace` is used in some 
code that gets executed again, and two pdb instances would use the same input, 
e.g. when debugging web applications.

See also https://bugs.python.org/issue23163 for/about improving docs in this 
regard.

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[issue21281] DEBUGGING: Simultaneous stopping of all threads on breakpoint and switching between threads

[Jesús Cea Avión]

Changes by Jesús Cea Avión j...@jcea.es:


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versions:  -Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4

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[issue21281] DEBUGGING: Simultaneous stopping of all threads on breakpoint and switching between threads

[Sebastian Jylanki]

New submission from Sebastian Jylanki:

When debugging with some of the other very popular tools like GDB all the 
threads are halted when a breakpoint is hit on any of the threads. Then threads 
can be switched and analyzed separately at the current state of execution.

When debugging with PDB only the thread that hits the breakpoint is halted. 
This makes it quite hard to debug multi-threaded programs (like IO based 
programs). Also it's annoying that the console output will be shown from other 
threads when the debugger is stopped.

I think it would be extremely helpful for many people to have PDB behave like 
GDB when debugging multithreaded applications: halt execution on all threads 
when breakpoint is hit and continue execution on all threads when execution is 
continued from the debugger.

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components: Interpreter Core
messages: 216677
nosy: azyr
priority: normal
severity: normal
status: open
title: DEBUGGING: Simultaneous stopping of all threads on breakpoint and 
switching between threads
type: enhancement
versions: Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5

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[issue21281] DEBUGGING: Simultaneous stopping of all threads on breakpoint and switching between threads

[Antoine Pitrou]

Changes by Antoine Pitrou pit...@free.fr:


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nosy: +georg.brandl

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