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

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Nov 06, 2014 at 10:38:34AM +0900, SeokYeon Hwang wrote:
> Please review this patch.
> 
> Thanks.

Thanks for the patch!
Sorry, this patch missed the devel freeze.
Please resubmit after 2.2 is out.

> > -----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