From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47955) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zlbd5-0002XD-C0 for qemu-devel@nongnu.org; Mon, 12 Oct 2015 07:51:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Zlbd4-0006lA-Bi for qemu-devel@nongnu.org; Mon, 12 Oct 2015 07:50:59 -0400 From: Fam Zheng Date: Mon, 12 Oct 2015 19:50:43 +0800 Message-Id: <1444650651-26227-5-git-send-email-famz@redhat.com> In-Reply-To: <1444650651-26227-1-git-send-email-famz@redhat.com> References: <1444650651-26227-1-git-send-email-famz@redhat.com> Subject: [Qemu-devel] [PATCH v2 04/12] aio: introduce aio_{disable, enable}_external List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf , Paolo Bonzini , qemu-block@nongnu.org, Stefan Hajnoczi Signed-off-by: Fam Zheng --- aio-posix.c | 3 ++- aio-win32.c | 3 ++- include/block/aio.h | 37 +++++++++++++++++++++++++++++++++++++ 3 files changed, 41 insertions(+), 2 deletions(-) diff --git a/aio-posix.c b/aio-posix.c index f0f9122..0467f23 100644 --- a/aio-posix.c +++ b/aio-posix.c @@ -261,7 +261,8 @@ bool aio_poll(AioContext *ctx, bool blocking) /* fill pollfds */ QLIST_FOREACH(node, &ctx->aio_handlers, node) { - if (!node->deleted && node->pfd.events) { + if (!node->deleted && node->pfd.events + && aio_node_check(ctx, node->is_external)) { add_pollfd(node); } } diff --git a/aio-win32.c b/aio-win32.c index 3110d85..43c4c79 100644 --- a/aio-win32.c +++ b/aio-win32.c @@ -309,7 +309,8 @@ bool aio_poll(AioContext *ctx, bool blocking) /* fill fd sets */ count = 0; QLIST_FOREACH(node, &ctx->aio_handlers, node) { - if (!node->deleted && node->io_notify) { + if (!node->deleted && node->io_notify + && aio_node_check(ctx, node->is_external)) { events[count++] = event_notifier_get_handle(node->e); } } diff --git a/include/block/aio.h b/include/block/aio.h index 12f1141..80151d1 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -122,6 +122,8 @@ struct AioContext { /* TimerLists for calling timers - one per clock type */ QEMUTimerListGroup tlg; + + int external_disable_cnt; }; /** @@ -375,4 +377,39 @@ static inline void aio_timer_init(AioContext *ctx, */ int64_t aio_compute_timeout(AioContext *ctx); +/** + * aio_disable_external: + * @ctx: the aio context + * + * Disable the furthur processing of clients. + */ +static inline void aio_disable_external(AioContext *ctx) +{ + atomic_inc(&ctx->external_disable_cnt); +} + +/** + * aio_enable_external: + * @ctx: the aio context + * + * Disable the processing of external clients. + */ +static inline void aio_enable_external(AioContext *ctx) +{ + atomic_dec(&ctx->external_disable_cnt); +} + +/** + * aio_node_check: + * @ctx: the aio context + * @is_external: Whether or not the checked node is an external event source. + * + * Check if the node's is_external flag is okey to be polled by the ctx at this + * moment. True means green light. + */ +static inline bool aio_node_check(AioContext *ctx, bool is_external) +{ + return !is_external || !atomic_read(&ctx->external_disable_cnt); +} + #endif -- 2.6.1