logd: replace internal CLOCK_MONOTONIC use with sequence numbers

- switch to simpler and faster internal sequence number, drops
  a syscall overhead on 32-bit platforms.
- add ability to break-out of flushTo loop with filter return -1
  allowing in reduction in reader overhead.

Change-Id: Ic5cb2b9afa4d9470153971fc9197b07279e2b79d
9 files changed
tree: 67b44449dd87addced5ea40ad764647cfce2316d
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/