Commit Graph

6 Commits

Author SHA1 Message Date
Léo Lam cf60a9a7f7 Use separate libusb contexts to avoid thread safety issues
Unfortunately, it appears that using libusb's synchronous transfer API
from several threads causes nasty race conditions in event handling and
can lead to deadlocks, despite the fact that libusb's synchronous API
is documented to be perfectly fine to use from several threads (only
the manual polling functionality is supposed to require special
precautions).

Since usbdk was the only real reason for using a single libusb context
and since usbdk (currently) has so many issues with Dolphin, I think
dropping support for it in order to fix other backends is acceptable.
2019-06-26 17:55:51 +02:00
Léo Lam 256c9375c9 Move libusb utilities to LibusbUtils
* Simplifies libusb context usage and allows us to set options for
all contexts easily. Notably, this lets us enable usbdk support
in libusb, which is now opt-in in the latest version.

* Moves the libusb config descriptor wrapper class to LibusbUtils too
since that could easily be reused.

* Moves device listing to LibusbUtils too and add a lock around it
as some libusb backends are not thread safe.

* Consequences: only a single context and a single event handling
thread is used now, which is more efficient.
2019-05-27 20:09:55 +02:00
Léo Lam 32a1b5068a Revert "Use a single libusb context"
This reverts commit c8a6dc6c23.

libusb on Windows isn't really safe to use from different threads
with a single context.
2017-03-26 15:58:30 +02:00
Léo Lam 6a0bf24e0b Move libusb context initialization to on first use
This prevents libusb warnings from showing up even when the user is
not using Bluetooth or USB passthrough, or the Wii U GC adapter.
2017-02-07 00:47:21 +01:00
Léo Lam c8a6dc6c23 Use a single libusb context
libusb on Windows is limited to only a single context. Trying to open
more than one can cause device enumerations to fail randomly.

libusb is thread-safe and we don't use the manual polling support (with
`poll()`) so this should be safe.
2017-02-05 11:36:48 +01:00
Léo Lam 69a13a12e2 Add USB passthrough setting and USBUtils
This adds a USB passthrough setting to ConfigManager and everything
needed for the UI to show and manage the whitelist properly.
2017-02-05 11:36:46 +01:00