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CVS commit: src/sys

Module Name:    src
Committed By:   riastradh
Date:           Sat Apr  9 23:45:37 UTC 2022

Modified Files:
        src/sys/kern: kern_lwp.c kern_turnstile.c
        src/sys/sys: lwp.h

Log Message:
kern: Handle l_mutex with atomic_store_release, atomic_load_consume.

- Where the lock is held and known to be correct, no atomic.
- In loops to acquire the lock, use atomic_load_relaxed before we
  restart with atomic_load_consume.

Nix membar_exit.

(Who knows, using atomic_load_consume here might fix bugs on Alpha!)

To generate a diff of this commit:
cvs rdiff -u -r1.247 -r1.248 src/sys/kern/kern_lwp.c
cvs rdiff -u -r1.41 -r1.42 src/sys/kern/kern_turnstile.c
cvs rdiff -u -r1.214 -r1.215 src/sys/sys/lwp.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

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