[issue35624] Shelve sync issues while using Gevent

[STINNER Victor]

Change by STINNER Victor :


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nosy: +vstinner

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[issue35624] Shelve sync issues while using Gevent

[Raymond Hettinger]

Raymond Hettinger  added the comment:

The docs already note a restriction: "the shelve module does not support 
concurrent read/write access to shelved objects".  We should further document 
that sync() is not thread-safe.  When sync() is running, the *writeback* 
attribute is set to False and other threads will stop updating the cache.

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nosy: +rhettinger

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[issue35624] Shelve sync issues while using Gevent

[Terry J. Reedy]

Terry J. Reedy  added the comment:

3.6 only gets security fixes.  Please verify that there is a problem in 3.8 (or 
at least 3.7)

Also demonstrate that issue is not with the 3rd party gevent module.  Does 
gevent includes compiled non-python code?  (I suspect it does, but don't know.) 
 If so, your script should *not* import that extension.  Or you should close 
this as '3rd party' and submit a report to the gevent authors, who should be 
better able to determine where the problem originates.

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nosy: +terry.reedy
versions: +Python 3.8 -Python 3.6

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[issue35624] Shelve sync issues while using Gevent

[Rémi Lapeyre]

Rémi Lapeyre  added the comment:

Hi, thanks for opening a bug report. Can you provide a script that reproduce 
the issue?

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nosy: +remi.lapeyre

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[issue35624] Shelve sync issues while using Gevent

[Oded Engel]

Change by Oded Engel :


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type:  -> behavior

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[issue35624] Shelve sync issues while using Gevent

[Oded Engel]

New submission from Oded Engel :

Shelve method, sync, does not work when using gevent threading.
writeback was set to True, flag was set to 'c'.
only way to get the dbb synced is by closing and reopening the db.

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components: Library (Lib)
messages: 332807
nosy: Oded Engel
priority: normal
severity: normal
status: open
title: Shelve sync issues while using Gevent
versions: Python 3.6

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