include/mutex: Use inotifywait to improve performance

The current mutex implementation uses sleep to periodically check if
the lock can be acquired. This causes a lot of latency for short waits
and a lot of unnecessary sleep/wakeup cycles for long waits.
This commit changes the mutex implementation to use inotifywait
instead of sleep, increasing mutex performance for both short and long
waits.

diff --git a/include/mutex.sh b/include/mutex.sh
index 5760cfd1a9f1e6de1b58e36e8263ecd8699609b7..edc4da76405b61903d35254773b3584f37d37833 100644 (file)
--- a/include/mutex.sh
+++ b/include/mutex.sh
@@ -27,7 +27,7 @@ mutex_lock() {
        lock="$1"
 
        while ! mutex_trylock "$lock"; do
-               sleep 1
+               inotifywait -qq "${lock%/*}"
        done
 
        return 0