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block: add block_job_sleep_ns

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This function abstracts the pretty complex semantics of the "busy"
member of BlockJob.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-05-08 16:51:45 +02:00 • committed by Kevin Wolf
parent 0ac9377d04
commit 4513eafe92
3 changed files with 35 additions and 21 deletions
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11
block.c
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@ -4188,6 +4188,7 @@ void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs,
job->bs = bs;
job->cb = cb;
job->opaque = opaque;
job->busy = true;
bs->job = job;
/* Only set speed when necessary to avoid NotSupported error */
@ -4254,3 +4255,13 @@ void block_job_cancel_sync(BlockJob *job)
qemu_aio_wait();
}
}
void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns)
{
/* Check cancellation *before* setting busy = false, too! */
if (!block_job_is_cancelled(job)) {
job->busy = false;
co_sleep_ns(clock, ns);
job->busy = true;
}
}