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coroutine: Introduce qemu_coroutine_enter_if_inactive()

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In the context of asynchronous work, if we have a worker coroutine that
didn't yield, the parent coroutine cannot be reentered because it hasn't
yielded yet. In this case we don't even have to reenter the parent
because it will see that the work is already done and won't even yield.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
This commit is contained in:
Kevin Wolf
2016-11-07 16:34:35 +01:00
parent 4baaa8c3d8
commit 536fca7f7e
2 changed files with 13 additions and 0 deletions
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6
include/qemu/coroutine.h
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@ -70,6 +70,12 @@ Coroutine *qemu_coroutine_create(CoroutineEntry *entry, void *opaque);
*/
void qemu_coroutine_enter(Coroutine *coroutine);
/**
* Transfer control to a coroutine if it's not active (i.e. part of the call
* stack of the running coroutine). Otherwise, do nothing.
*/
void qemu_coroutine_enter_if_inactive(Coroutine *co);
/**
* Transfer control back to a coroutine's caller
*