From a6e5873443e4a540b0ef7135c5c4082f03b5b50d Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@musicpd.org>
Date: Thu, 26 Apr 2018 12:16:18 +0200
Subject: [PATCH] output/alsa: thread-safety documentation for attribute
 "active"

---
 src/output/plugins/AlsaOutputPlugin.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/output/plugins/AlsaOutputPlugin.cxx b/src/output/plugins/AlsaOutputPlugin.cxx
index 100643c4f..b38fd36c0 100644
--- a/src/output/plugins/AlsaOutputPlugin.cxx
+++ b/src/output/plugins/AlsaOutputPlugin.cxx
@@ -122,6 +122,9 @@ class AlsaOutput final
 	/**
 	 * After Open(), has this output been activated by a Play()
 	 * command?
+	 *
+	 * This attribute is not thread-safe.  It is only used by the
+	 * client thread (the thread which calls AudioOutput public methods).
 	 */
 	bool active;