[issue41567] multiprocessing.Pool from concurrent threads failure on 3.9.0rc1

[doublex]

doublex  added the comment:

Example code (fails):


import os, concurrent.futures

def parallel_callback( arg ):
return os.getpid()

def parallel( *args ):
def thread_callback( param ):
with concurrent.futures.ProcessPoolExecutor(max_workers=1) as executor:
future = executor.submit( parallel_callback, param )
pid = future.result()
print( 'pid:', pid )
return pid
with concurrent.futures.ThreadPoolExecutor(max_workers=len(args)) as 
executor:
future = executor.map( thread_callback, args )
results = list(future)
print( 'DONE' )

parallel( 1, 2, 3 )

--
nosy: +doublex

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[issue43065] Delegating to thread and process deadlocks

[doublex]

Change by doublex :


--
stage:  -> resolved
status: open -> closed

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[issue43065] 'concurrent.futures' stucks in 3.9.1

[doublex]

New submission from doublex :

Works with python 3.8
Fails with 3.9.1 (tested on CentOS 7 and Ubuntu 2004)
Yes, sometimes is does not stuck...

Command-line: 
python3.9 stuck.py

--
components: Interpreter Core
files: stuck.py
messages: 385931
nosy: doublex
priority: normal
severity: normal
status: open
title: 'concurrent.futures' stucks in 3.9.1
type: resource usage
versions: Python 3.9
Added file: https://bugs.python.org/file49775/stuck.py

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[issue43065] Delegating to thread and process stucks in 3.9.1

[doublex]

Change by doublex :


--
components: +Library (Lib) -Interpreter Core
title: 'concurrent.futures' stucks in 3.9.1 -> Delegating to thread and process 
stucks in 3.9.1

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[issue43065] Delegating to thread and process deadlocks

[doublex]

Change by doublex :


--
title: Delegating to thread and process stucks in 3.9.1 -> Delegating to thread 
and process deadlocks

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