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async: Introduce aio_co_enter 

They start the coroutine on the specified context.

Signed-off-by: Fam Zheng <famz@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2017-04-10 20:07:35 +08:00
parent ba9e75ceef
commit 8865852e00
2 changed files with 15 additions and 1 deletions
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9
include/block/aio.h
View File

@ -510,6 +510,15 @@ void aio_co_schedule(AioContext *ctx, struct Coroutine *co);
*/
void aio_co_wake(struct Coroutine *co);
/**
* aio_co_enter:
* @ctx: the context to run the coroutine
* @co: the coroutine to run
*
* Enter a coroutine in the specified AioContext.
*/
void aio_co_enter(AioContext *ctx, struct Coroutine *co);
/**
* Return the AioContext whose event loop runs in the current thread.
*

7
util/async.c
View File

@ -453,6 +453,11 @@ void aio_co_wake(struct Coroutine *co)
smp_read_barrier_depends();
ctx = atomic_read(&co->ctx);
aio_co_enter(ctx, co);
}
void aio_co_enter(AioContext *ctx, struct Coroutine *co)
{
if (ctx != qemu_get_current_aio_context()) {
aio_co_schedule(ctx, co);
return;
@ -464,7 +469,7 @@ void aio_co_wake(struct Coroutine *co)
QSIMPLEQ_INSERT_TAIL(&self->co_queue_wakeup, co, co_queue_next);
} else {
aio_context_acquire(ctx);
qemu_coroutine_enter(co);
qemu_aio_coroutine_enter(ctx, co);
aio_context_release(ctx);
}
}