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

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

> -----Original Message-----
> From: Michael S. Tsirkin [mailto:mst@redhat.com]
> Sent: Thursday, November 06, 2014 6:17 PM
> To: SeokYeon Hwang
> Cc: qemu-devel@nongnu.org; aneesh.kumar@linux.vnet.ibm.com;
> pbonzini@redhat.com; Peter Maydell
> Subject: Re: [PATCH] 9pfs: changed to use event_notifier instead of
> qemu_pipe
> 
> 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.
> 

Ok, 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