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Improve recursive unfair lock #1742

Merged
merged 1 commit into from
Dec 10, 2019
Merged

Improve recursive unfair lock #1742

merged 1 commit into from
Dec 10, 2019

Commits on Dec 9, 2019

  1. Improve recursive unfair lock: 

    - Use relaxed memory since we don't need acquire/release. This'll make it faster.
- Add a couple assertions and organize the code better.
- In contested case, just lock instead of tryLock-fail-lock.
- In recursive case, do not tryLock. Just notice it's recursive and be done.
- In uncontested case, just lock instead of tryLock.

PRESUBMIT=passed
BUG=137413265
R=maicki
CC=maxwang,rexhu,wiseoldduck,yt-elements-eng+cl
REQUIRED_REVIEW=1
DELTA=50 (14 added, 13 deleted, 23 changed)
DELTA_BY_EXTENSION=h=1,mm=36
OCL=278419008


P4 change: 278454084
    @Adlai-Holler
    adlai authored and Adlai-Holler committed Dec 9, 2019
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