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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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22
block_int.h
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@ -97,18 +97,15 @@ struct BlockJob {
/**
* Set to true if the job should cancel itself. The flag must
* always be tested just before toggling the busy flag from false
* to true. After a job has detected that the cancelled flag is
* true, it should not anymore issue any I/O operation to the
* block device.
* to true. After a job has been cancelled, it should only yield
* if #qemu_aio_wait will ("sooner or later") reenter the coroutine.
*/
bool cancelled;
/**
* Set to false by the job while it is in a quiescent state, where
* no I/O is pending and cancellation can be processed without
* issuing new I/O. The busy flag must be set to false when the
* job goes to sleep on any condition that is not detected by
* #qemu_aio_wait, such as a timer.
* no I/O is pending and the job has yielded on any condition
* that is not detected by #qemu_aio_wait, such as a timer.
*/
bool busy;
@ -363,6 +360,17 @@ void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs,
int64_t speed, BlockDriverCompletionFunc *cb,
void *opaque, Error **errp);
/**
* block_job_sleep_ns:
* @job: The job that calls the function.
* @clock: The clock to sleep on.
* @ns: How many nanoseconds to stop for.
*
* Put the job to sleep (assuming that it wasn't canceled) for @ns
* nanoseconds. Canceling the job will interrupt the wait immediately.
*/
void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns);
/**
* block_job_complete:
* @job: The job being completed.