usb1: bind USBContext.interruptEventHandler.

Fixes #90.

Author: whitequark

usb1/__init__.py

@@ -2393,6 +2393,15 @@ def handleEventsTimeout(self, tv=0):
 
     # TODO: handleEventsTimeoutCompleted
 
+    @_validContext
+    def interruptEventHandler(self):
+        """
+        Interrupt any active thread that is handling events.
+        This is mainly useful for interrupting a dedicated event handling thread
+        when the application wishes to exit.
+        """
+        libusb1.libusb_interrupt_event_handler(self.__context_p)
+
     @_validContext
     def setPollFDNotifiers(
             self, added_cb=None, removed_cb=None, user_data=None):

usb1/_libusb1.py

@@ -566,6 +566,14 @@ def libusb_get_max_iso_packet_size(_, __):
     #int libusb_handle_events_locked(libusb_context *ctx, struct timeval *tv);
     libusb_handle_events_locked = libusb.libusb_handle_events_locked
     libusb_handle_events_locked.argtypes = [libusb_context_p, timeval_p]
+    #void libusb_interrupt_event_handler(libusb_context *ctx);
+    try:
+        libusb_interrupt_event_handler = libusb.libusb_interrupt_event_handler
+    except AttributeError:
+        def libusb_interrupt_event_handler(_):
+            raise NotImplementedError
+    else:
+        libusb_interrupt_event_handler.argtypes = [libusb_context_p]
     #int libusb_get_next_timeout(libusb_context *ctx, struct timeval *tv);
     libusb_get_next_timeout = libusb.libusb_get_next_timeout
     libusb_get_next_timeout.argtypes = [libusb_context_p, timeval_p]