CRC-checksum failed in gzip

Laszlo Nagy gandalf at
Thu Aug 2 12:14:14 CEST 2012

> Technically, that is correct, but IMHO its complete nonsense to share 
> the file object between threads in the first place. If you need the 
> data in two threads, just read the file once and then share the 
> read-only, immutable content. If the file is small or too large to be 
> held in memory at once, just open and read it on demand. This also 
> saves you from having to rewind the file every time you read it.
> Am I missing something?
We suspect that his program reads the same file object from different 
threads. At least this would explain his problem. I agree with you - 
usually it is not a good idea to share a file object between threads. 
This is what I told him the first time. But it is not in our hands - he 
already has a program that needs to be fixed. It might be easier for him 
to protect read() calls with a lock. Because it can be done 
automatically, without thinking too much.

More information about the Python-list mailing list