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async: add aio_bh_schedule_oneshot

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qemu_bh_delete is already clearing bh->scheduled at the same time
as it's setting bh->deleted.  Since it's not using any memory
barriers, there is no synchronization going on for bh->deleted,
and this makes the bh->deleted checks superfluous in aio_compute_timeout,
aio_bh_poll and aio_ctx_check.

Just remove them, and put the (bh->scheduled && bh->deleted) combo
to work in a new function aio_bh_schedule_oneshot.  The new function
removes the need to save the QEMUBH pointer between the creation
and the execution of the bottom half.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-03 18:14:15 +02:00 • committed by Kevin Wolf
parent 818bbc86c9
commit 5b8bb3595a
2 changed files with 29 additions and 4 deletions
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6
include/block/aio.h
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@ -180,6 +180,12 @@ void aio_context_acquire(AioContext *ctx);
/* Relinquish ownership of the AioContext. */
void aio_context_release(AioContext *ctx);
/**
* aio_bh_schedule_oneshot: Allocate a new bottom half structure that will run
* only once and as soon as possible.
*/
void aio_bh_schedule_oneshot(AioContext *ctx, QEMUBHFunc *cb, void *opaque);
/**
* aio_bh_new: Allocate a new bottom half structure.
*