Re: [Qemu-devel] [PATCH] 9pfs: changed to use event_notifier instead of qemu_pipe

[SeokYeon Hwang <syeon.hwang@samsung.com>]

Please review this patch.

Thanks.

> -----Original Message-----
> From: SeokYeon Hwang [mailto:syeon.hwang@samsung.com]
> Sent: Friday, October 31, 2014 5:04 PM
> To: qemu-devel@nongnu.org
> Cc: aneesh.kumar@linux.vnet.ibm.com; SeokYeon Hwang
> Subject: [PATCH] 9pfs: changed to use event_notifier instead of qemu_pipe
> 
> Changed to use event_notifier instead of qemu_pipe.
> It is necessary for porting 9pfs to Windows and MacOS.
> 
> Signed-off-by: SeokYeon Hwang <syeon.hwang@samsung.com>
> ---
>  hw/9pfs/virtio-9p-coth.c | 29 +++++++----------------------
> hw/9pfs/virtio-9p-coth.h |  4 ++--
>  2 files changed, 9 insertions(+), 24 deletions(-)
> 
> diff --git a/hw/9pfs/virtio-9p-coth.c b/hw/9pfs/virtio-9p-coth.c index
> ae6cde8..8185c53 100644
> --- a/hw/9pfs/virtio-9p-coth.c
> +++ b/hw/9pfs/virtio-9p-coth.c
> @@ -14,6 +14,7 @@
> 
>  #include "fsdev/qemu-fsdev.h"
>  #include "qemu/thread.h"
> +#include "qemu/event_notifier.h"
>  #include "block/coroutine.h"
>  #include "virtio-9p-coth.h"
> 
> @@ -26,15 +27,11 @@ void co_run_in_worker_bh(void *opaque)
>      g_thread_pool_push(v9fs_pool.pool, co, NULL);  }
> 
> -static void v9fs_qemu_process_req_done(void *arg)
> +static void v9fs_qemu_process_req_done(EventNotifier *e)
>  {
> -    char byte;
> -    ssize_t len;
>      Coroutine *co;
> 
> -    do {
> -        len = read(v9fs_pool.rfd, &byte, sizeof(byte));
> -    } while (len == -1 &&  errno == EINTR);
> +    event_notifier_test_and_clear(e);
> 
>      while ((co = g_async_queue_try_pop(v9fs_pool.completed)) != NULL) {
>          qemu_coroutine_enter(co, NULL); @@ -43,22 +40,18 @@ static void
> v9fs_qemu_process_req_done(void *arg)
> 
>  static void v9fs_thread_routine(gpointer data, gpointer user_data)  {
> -    ssize_t len;
> -    char byte = 0;
>      Coroutine *co = data;
> 
>      qemu_coroutine_enter(co, NULL);
> 
>      g_async_queue_push(v9fs_pool.completed, co);
> -    do {
> -        len = write(v9fs_pool.wfd, &byte, sizeof(byte));
> -    } while (len == -1 && errno == EINTR);
> +
> +    event_notifier_set(&v9fs_pool.e);
>  }
> 
>  int v9fs_init_worker_threads(void)
>  {
>      int ret = 0;
> -    int notifier_fds[2];
>      V9fsThPool *p = &v9fs_pool;
>      sigset_t set, oldset;
> 
> @@ -66,10 +59,6 @@ int v9fs_init_worker_threads(void)
>      /* Leave signal handling to the iothread.  */
>      pthread_sigmask(SIG_SETMASK, &set, &oldset);
> 
> -    if (qemu_pipe(notifier_fds) == -1) {
> -        ret = -1;
> -        goto err_out;
> -    }
>      p->pool = g_thread_pool_new(v9fs_thread_routine, p, -1, FALSE, NULL);
>      if (!p->pool) {
>          ret = -1;
> @@ -84,13 +73,9 @@ int v9fs_init_worker_threads(void)
>          ret = -1;
>          goto err_out;
>      }
> -    p->rfd = notifier_fds[0];
> -    p->wfd = notifier_fds[1];
> -
> -    fcntl(p->rfd, F_SETFL, O_NONBLOCK);
> -    fcntl(p->wfd, F_SETFL, O_NONBLOCK);
> +    event_notifier_init(&p->e, 0);
> 
> -    qemu_set_fd_handler(p->rfd, v9fs_qemu_process_req_done, NULL, NULL);
> +    event_notifier_set_handler(&p->e, v9fs_qemu_process_req_done);
>  err_out:
>      pthread_sigmask(SIG_SETMASK, &oldset, NULL);
>      return ret;
> diff --git a/hw/9pfs/virtio-9p-coth.h b/hw/9pfs/virtio-9p-coth.h index
> 86d5ed4..4f51b25 100644
> --- a/hw/9pfs/virtio-9p-coth.h
> +++ b/hw/9pfs/virtio-9p-coth.h
> @@ -21,8 +21,8 @@
>  #include <glib.h>
> 
>  typedef struct V9fsThPool {
> -    int rfd;
> -    int wfd;
> +    EventNotifier e;
> +
>      GThreadPool *pool;
>      GAsyncQueue *completed;
>  } V9fsThPool;
> --
> 2.1.0