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block: add aio_wait_bh_oneshot()

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Sometimes it's necessary for the main loop thread to run a BH in an
IOThread and wait for its completion.  This primitive is useful during
startup/shutdown to synchronize and avoid race conditions.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20180307144205.20619-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2018-03-07 14:42:02 +00:00
parent 12c1c7d7ce
commit b89d92f3cf
2 changed files with 44 additions and 0 deletions
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13
include/block/aio-wait.h
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@ -113,4 +113,17 @@ typedef struct {
*/
void aio_wait_kick(AioWait *wait);
/**
* aio_wait_bh_oneshot:
* @ctx: the aio context
* @cb: the BH callback function
* @opaque: user data for the BH callback function
*
* Run a BH in @ctx and wait for it to complete.
*
* Must be called from the main loop thread with @ctx acquired exactly once.
* Note that main loop event processing may occur.
*/
void aio_wait_bh_oneshot(AioContext *ctx, QEMUBHFunc *cb, void *opaque);
#endif /* QEMU_AIO_WAIT */