>
> Hi,
>
> On Thu, Jul 11, 2019 at 02:00:54PM +0100, Frediano Ziglio wrote:
> > Attempt to better interrupt event handling loop.
> > If the thread handling events is stuck waiting events or handling an
> > event try to interrupt before joining the thread.
>
> Do you have a UI stuck or something without this patch?
>
Good question. Never happened, however:
- I had some experience in the past with libusb and multi-threading
and I know this call is useful;
- for Unix (but not Windows) there's some lines above the comment
/* Force termination of the event thread even if there were some
* mismatched spice_usb_device_manager_{start,stop}_event_listening
* calls. Otherwise, the usb event thread will be leaked, and will
* try to use the libusb context we destroy in finalize(), which would
* cause a crash */
so calling that function on all (Unix and Windows) will help too.
Maybe adding in commit message:
"For Unix code in spice_usb_device_manager_dispose will try to
force some thread exit but this is not done for Windows
so calling libusb_interrupt_event_handler will help.
Code is not in a hot path so won't change the execution time."
> > Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
> > ---
> > src/usb-backend.c | 7 +++++++
> > src/usb-backend.h | 1 +
> > src/usb-device-manager.c | 4 ++++
> > 3 files changed, 12 insertions(+)
> >
> > diff --git a/src/usb-backend.c b/src/usb-backend.c
> > index 48a62cd1..a2c502da 100644
> > --- a/src/usb-backend.c
> > +++ b/src/usb-backend.c
> > @@ -230,6 +230,13 @@ gboolean
> > spice_usb_backend_handle_events(SpiceUsbBackend *be)
> > return ok;
> > }
> >
> > +void spice_usb_backend_interrupt_event_handler(SpiceUsbBackend *be)
> > +{
> > + if (be->libusb_context) {
> > + libusb_interrupt_event_handler(be->libusb_context);
> > + }
> > +}
> > +
> > static int LIBUSB_CALL hotplug_callback(libusb_context *ctx,
> > libusb_device *device,
> > libusb_hotplug_event event,
> > diff --git a/src/usb-backend.h b/src/usb-backend.h
> > index 9f2a97a6..cbb73c22 100644
> > --- a/src/usb-backend.h
> > +++ b/src/usb-backend.h
> > @@ -65,6 +65,7 @@ after it finishes list processing
> > SpiceUsbBackendDevice **spice_usb_backend_get_device_list(SpiceUsbBackend
> > *backend);
> > void spice_usb_backend_free_device_list(SpiceUsbBackendDevice **devlist);
> > gboolean spice_usb_backend_handle_events(SpiceUsbBackend *be);
> > +void spice_usb_backend_interrupt_event_handler(SpiceUsbBackend *be);
> > gboolean spice_usb_backend_register_hotplug(SpiceUsbBackend *be,
> > void *user_data,
> > usb_hot_plug_callback proc);
> > diff --git a/src/usb-device-manager.c b/src/usb-device-manager.c
> > index 4960667e..0d12432f 100644
> > --- a/src/usb-device-manager.c
> > +++ b/src/usb-device-manager.c
> > @@ -328,6 +328,8 @@ static void spice_usb_device_manager_dispose(GObject
> > *gobject)
> > #endif
> > if (priv->event_thread) {
> > g_warn_if_fail(g_atomic_int_get(&priv->event_thread_run) ==
> > FALSE);
> > + g_atomic_int_set(&priv->event_thread_run, FALSE);
> > + spice_usb_backend_interrupt_event_handler(priv->context);
> > g_thread_join(priv->event_thread);
> > priv->event_thread = NULL;
> > }
> > @@ -988,6 +990,8 @@ gboolean
> > spice_usb_device_manager_start_event_listening(
> > libusb_handle_events call in the thread won't exit until the
> > libusb_close call for the device is made from usbredirhost_close.
> > */
> > if (priv->event_thread) {
> > + g_atomic_int_set(&priv->event_thread_run, FALSE);
> > + spice_usb_backend_interrupt_event_handler(priv->context);
> > g_thread_join(priv->event_thread);
> > priv->event_thread = NULL;
> > }
Frediano
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