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bh=NwBaSYBB/sxiJzmlg84ife1ZA83qDiOPiyoHyauG2Lw=; b=iIARToMLqqMh5c+qvWAKiolWpJ2TQWW+CqWi6lRBuOxMMPMv3uxmL7ziel6PzgdvgYEw7b GX40JwJZ1KlDN1yBAn4WubanwTXn18r5jS1on5SatG2vsr9Tq0UxWmo6UY9J+srMg4h5Ni Jh8+sugPWvr0LTI+4hSfDC7LTG1zRTA= X-MC-Unique: 2qxebLqAMyue0duwd84OKA-1 From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PULL 11/14] util/async: Add aio_co_reschedule_self() Date: Fri, 9 Oct 2020 08:34:29 +0200 Message-Id: <20201009063432.303441-12-armbru@redhat.com> In-Reply-To: <20201009063432.303441-1-armbru@redhat.com> References: <20201009063432.303441-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" From: Kevin Wolf Add a function that can be used to move the currently running coroutine to a different AioContext (and therefore potentially a different thread). Signed-off-by: Kevin Wolf Reviewed-by: Stefan Hajnoczi Message-Id: <20201005155855.256490-12-kwolf@redhat.com> Reviewed-by: Markus Armbruster Reviewed-by: Stefan Hajnoczi Signed-off-by: Markus Armbruster --- include/block/aio.h | 10 ++++++++++ util/async.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/include/block/aio.h b/include/block/aio.h index ec8c5af642..5f342267d5 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -17,6 +17,7 @@ #ifdef CONFIG_LINUX_IO_URING #include #endif +#include "qemu/coroutine.h" #include "qemu/queue.h" #include "qemu/event_notifier.h" #include "qemu/thread.h" @@ -654,6 +655,15 @@ static inline bool aio_node_check(AioContext *ctx, boo= l is_external) */ void aio_co_schedule(AioContext *ctx, struct Coroutine *co); =20 +/** + * aio_co_reschedule_self: + * @new_ctx: the new context + * + * Move the currently running coroutine to new_ctx. If the coroutine is al= ready + * running in new_ctx, do nothing. + */ +void coroutine_fn aio_co_reschedule_self(AioContext *new_ctx); + /** * aio_co_wake: * @co: the coroutine diff --git a/util/async.c b/util/async.c index f758354c6a..674dbefb7c 100644 --- a/util/async.c +++ b/util/async.c @@ -569,6 +569,36 @@ void aio_co_schedule(AioContext *ctx, Coroutine *co) aio_context_unref(ctx); } =20 +typedef struct AioCoRescheduleSelf { + Coroutine *co; + AioContext *new_ctx; +} AioCoRescheduleSelf; + +static void aio_co_reschedule_self_bh(void *opaque) +{ + AioCoRescheduleSelf *data =3D opaque; + aio_co_schedule(data->new_ctx, data->co); +} + +void coroutine_fn aio_co_reschedule_self(AioContext *new_ctx) +{ + AioContext *old_ctx =3D qemu_get_current_aio_context(); + + if (old_ctx !=3D new_ctx) { + AioCoRescheduleSelf data =3D { + .co =3D qemu_coroutine_self(), + .new_ctx =3D new_ctx, + }; + /* + * We can't directly schedule the coroutine in the target context + * because this would be racy: The other thread could try to enter= the + * coroutine before it has yielded in this one. + */ + aio_bh_schedule_oneshot(old_ctx, aio_co_reschedule_self_bh, &data); + qemu_coroutine_yield(); + } +} + void aio_co_wake(struct Coroutine *co) { AioContext *ctx; --=20 2.26.2