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From: | Paolo Bonzini |
Subject: | Re: [RFC PATCH 3/4] include/sysemu/block-backend: split header into I/O and graph API |
Date: | Wed, 15 Sep 2021 14:14:08 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 |
On 13/09/21 15:27, Stefan Hajnoczi wrote:
+/* + * I/O API functions. These functions are thread-safe, and therefore + * can run in any AioContext."can run in any AioContext" makes me wonder what the exact requirements are. Can they run in any*thread* (regardless of whether an AioContext even exists for that thread) or do they need to run in a thread that has called qemu_set_current_aio_context()?
I think they can run in any thread as long as they have called aio_context_acquire/release; later on, they will be able to run in any thread completely (which will be the underlying mechanism for multiqueue).
Paolo
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