PX4/Firmware — pull request #141 by LorenzMeier (2013-01-09 10:06:58+00:00)
Title: Sdlog buffering

This changes the SD logger to an implementation with two threads, thread sync via pthread condition and locking.

The high-prio thread fills the ringbuffer, the low-prio thread empties it to microSD. This is to avoid loosing sensor messages or alternatively delaying controllers by SD I/O.