From 10e612d72c49c5c8762cca4fd17c864b3f373f70 Mon Sep 17 00:00:00 2001
From: v9v <36771847+v9v@users.noreply.github.com>
Date: Fri, 5 Jul 2019 19:33:12 +0200
Subject: [PATCH] Handle missing flock

If flock is not installed, fall back to the thread-unsafe version.
---
 scripts/continuum_save.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/continuum_save.sh b/scripts/continuum_save.sh
index 29b24ac..e8c3287 100755
--- a/scripts/continuum_save.sh
+++ b/scripts/continuum_save.sh
@@ -36,7 +36,9 @@ fetch_and_run_tmux_resurrect_save_script() {
 
 main() {
 	(
-		flock -n 101 || return  # The code below is not thread-safe.
+		# The code after "flock" is not thread-safe. A race condition can be triggered by multiple
+		# tmux clients performing autosave in parallel.
+		! command -v flock || flock -n 101 || return
 		if supported_tmux_version_ok && auto_save_not_disabled && enough_time_since_last_run_passed; then
 			fetch_and_run_tmux_resurrect_save_script
 		fi