make a note about process lock and ARDOUR::how_many_dsp_threads()

git-svn-id: svn://localhost/ardour2/branches/3.0@8794 d708f5d6-7413-0410-9779-e7cbd77b26cf

diff --git a/libs/ardour/utils.cc b/libs/ardour/utils.cc
index b19aad4fa92785fea0739571bb21996109e48e97..2ea8b73dc262da227f7500b392d7f0f253e64246 100644 (file)
--- a/libs/ardour/utils.cc
+++ b/libs/ardour/utils.cc
@@ -657,6 +657,8 @@ matching_unsuffixed_filename_exists_in (const string& dir, const string& path)
 uint32_t
 how_many_dsp_threads ()
 {
+        /* CALLER MUST HOLD PROCESS LOCK */
+
         int num_cpu = hardware_concurrency();
         int pu = Config->get_processor_usage ();
         uint32_t num_threads = max (num_cpu - 1, 2); // default to number of cpus minus one, or 2, whichever is larger