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Re: [Qemu-devel] [PATCH v1 08/14] net: introduce lock to protect NetQueu
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH v1 08/14] net: introduce lock to protect NetQueue |
Date: |
Tue, 21 May 2013 16:04:03 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, May 07, 2013 at 01:46:56PM +0800, Liu Ping Fan wrote:
> From: Liu Ping Fan <address@hidden>
>
> NetQueue will be accessed by nc and its peers at the same time,
> need lock to protect it.
>
> Signed-off-by: Liu Ping Fan <address@hidden>
> ---
> net/queue.c | 11 +++++++++++
> 1 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/net/queue.c b/net/queue.c
> index 859d02a..2856c1d 100644
> --- a/net/queue.c
> +++ b/net/queue.c
> @@ -53,6 +53,7 @@ struct NetQueue {
> uint32_t nq_maxlen;
> uint32_t nq_count;
>
> + QemuMutex lock;
> QTAILQ_HEAD(packets, NetPacket) packets;
>
> unsigned delivering : 1;
> @@ -68,6 +69,7 @@ NetQueue *qemu_new_net_queue(void *opaque)
> queue->nq_maxlen = 10000;
> queue->nq_count = 0;
>
> + qemu_mutex_init(&queue->lock);
> QTAILQ_INIT(&queue->packets);
>
> queue->delivering = 0;
> @@ -107,7 +109,9 @@ static void qemu_net_queue_append(NetQueue *queue,
> memcpy(packet->data, buf, size);
>
> queue->nq_count++;
> + qemu_mutex_lock(&queue->lock);
> QTAILQ_INSERT_TAIL(&queue->packets, packet, entry);
> + qemu_mutex_unlock(&queue->lock);
nq_count must be protected too.
- [Qemu-devel] [PATCH v1 00/14] port network layer onto glib, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 01/14] util: introduce gsource event abstraction, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 02/14] net: introduce bind_ctx to NetClientInfo, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 03/14] net: port vde onto GSource, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 04/14] net: port socket to GSource, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 05/14] net: port tap onto GSource, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 06/14] net: port tap-win32 onto GSource, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 07/14] net: hub use lock to protect ports list, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 08/14] net: introduce lock to protect NetQueue, Liu Ping Fan, 2013/05/07
- Re: [Qemu-devel] [PATCH v1 08/14] net: introduce lock to protect NetQueue,
Stefan Hajnoczi <=
- [Qemu-devel] [PATCH v1 09/14] net: introduce lock to protect NetClientState's peer's access, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 10/14] net: make netclient re-entrant with refcnt, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 11/14] slirp: make timeout local, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 12/14] slirp: make slirp event dispatch based on slirp instance, not global, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 13/14] slirp: handle race condition, Liu Ping Fan, 2013/05/07
- [Qemu-devel] [PATCH v1 14/14] slirp: use lock to protect the slirp_instances, Liu Ping Fan, 2013/05/07
- Re: [Qemu-devel] [PATCH v1 00/14] port network layer onto glib, Stefan Hajnoczi, 2013/05/15