zephyr/zephyr_getchar: Explicitly yield to other threads on char availability.

Without this, if there's a large chunk of data coming from hardware (e.g.
clipboard paste, or fed programmatically from the other side of the console),
there's a behavior of initial mass fill-in of the buffer without any
consumption, which starts much later and doesn't catch up with further
filling, leading to buffer overflow.

0 files changed, 0 insertions, 0 deletions