From c3a48ff9c9e0d55fa5b8be42eed4ffb43a760489 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Sat, 18 Dec 2021 09:35:10 -0700
Subject: [PATCH] triggerbox: add explanatory comment about how the triggerbox
 thread quit msg works

---
 libs/ardour/triggerbox.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libs/ardour/triggerbox.cc b/libs/ardour/triggerbox.cc
index c2c16af924..d4b43ccabd 100644
--- a/libs/ardour/triggerbox.cc
+++ b/libs/ardour/triggerbox.cc
@@ -2725,6 +2725,10 @@ TriggerBoxThread::queue_request (Request* req)
 {
 	char c = req->type;
 
+	/* Quit is handled by simply delivering the request type (1 byte), with
+	 * no payload in the FIFO. See ::thread_work() above.
+	 */
+
 	if (req->type != Quit) {
 		if (requests.write (&req, 1) != 1) {
 			return;