From 04eda32fa3a92223e7dfe22166529b1a7a04e419 Mon Sep 17 00:00:00 2001
From: Adrien <adrien.sueur@gmail.com>
Date: Sun, 20 Mar 2022 17:42:31 +0100
Subject: [PATCH] Add a note about doing lock (mutex like) in bash.

---
 20220319131922-verrou_bash.org | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 20220319131922-verrou_bash.org

diff --git a/20220319131922-verrou_bash.org b/20220319131922-verrou_bash.org
new file mode 100644
index 0000000..51ce7bd
--- /dev/null
+++ b/20220319131922-verrou_bash.org
@@ -0,0 +1,28 @@
+:PROPERTIES:
+:ID:       7052d327-0b67-40f6-a581-46df621cddb9
+:mtime:    20220319133448
+:ctime:    20220319131922
+:END:
+#+title: verrou-bash
+
+* Verrou (lock) en sh
+** Utilisation de /flock/
+#+BEGIN_SRC shell
+LOCK_PATH=/var/tmp/testlock.lock
+exec 100>${LOCK_PATH} || exit 1
+flock 100 || exit 1
+
+echo "Doing some stuff…"
+echo "Sleeping for 30 seconds…"
+sleep 30
+
+trap "rm -f ${LOCK_PATH}" EXIT
+#+END_SRC
+
+Quelques options :
+ * ~-w 10~ pour définir un timeout à ~flock~, ici 10 secondes.
+ * ~-n~ pour que ~flock~ n'attende pas si le verrou est pris.
+
+* Références
+ * [[https://www.putorius.net/lock-files-bash-scripts.html][Using Lock Files for Job Control in Bash Scripts - Putorius]]
+ * [[https://linux.die.net/man/1/flock][Man flock]]