[Libguestfs] Is thread-safe for pread_device in python?

[陳培泓]

I want to test performance on reading one 1GB qcow2 file in python

I create multiple threads and read the qcow2 file by pread_device function
in python. And these threads share the same guest handler and device

Is pread_device thread-safe?

My result always shows pread_device can't get reply and corrupted
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