output/alsa: thread-safety documentation for attribute "active"

a6e58734 · Max Kellermann · e2cf7775 · a6e58734
Commit a6e58734 authored Apr 26, 2018 by Max Kellermann
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AlsaOutputPlugin.cxx src/output/plugins/AlsaOutputPlugin.cxx +3 -0

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--- 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;