Abstract: Methods for drawing content to a display are provided. In one aspect, a method includes receiving input indicating content to be drawn to a display, and providing a request to prepare the content for display to a first thread. The method also includes receiving, in response to the provided request, instructions for drawing the content to the display, and providing the instructions for drawing the content to the display to a second thread. The method further includes executing, by the second thread, the instructions for drawing the content to the display. Systems and machine-readable media are also provided.

Abstract: An anti-asphyxia valve includes at least one flap having a first portion adapted for mounting to the housing and a second portion adapted to flex between a first open position allowing gas to pass from the patient side to the housing interior through the at least one port, and from the blower side through the at least one port, to atmosphere when a difference in gas pressure in the housing interior and atmosphere is below a predetermined operating threshold, and a second forcibly closed position substantially occluding the at least one port when the difference in gas pressure between the housing interior and atmosphere is substantially equal to or above the operating threshold.