From: Matthias Kruk <m@m10k.eu>
Date: Thu, 15 Apr 2021 23:46:33 +0000 (+0900)
Subject: include/mutex: Use inotifywait to improve performance
X-Git-Url: https://git.corax.cc/?a=commitdiff_plain;h=b7ae89d8c1147e1ae7d2c176aa7ab902c951102c;p=toolbox

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 5760cfd..edc4da7 100644
--- 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