[Libguestfs] [PATCH nbdkit] New plugin: blkio [incomplete]

[Stefan Hajnoczi]

On Wed, Jan 04, 2023 at 07:01:24PM +0000, Richard W.M. Jones wrote:
> (5) "The application is responsible for thread-safety. No thread
> synchronization is necessary when a queue is only used from a single
> thread. Proper synchronization is required when sharing a queue
> between multiple threads."
> 
> Does this apply across multiple struct blkio handles?  ie. Is there
> now, or could there be in future, some global state which would be
> corrupted by parallel calls across multiple handles?
> 
> This matters because we could use NBDKIT_THREAD_MODEL_SERIALIZE_REQUESTS
> instead of NBDKIT_THREAD_MODEL_SERIALIZE_ALL_REQUESTS
> (https://libguestfs.org/nbdkit-plugin.3.html#Threads).

There is no global state.

If there is global state in the future then the user would be aware of
it (e.g. they would have to explicitly create "shared" blkio instances).

Stefan
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