part 2 of 3 of the 2.8 -> 3.0 merge

git-svn-id: svn://localhost/ardour2/branches/3.0@4987 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 4 insertions, 2 deletions

diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index e62d672984..f2e1b2a730 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -4085,7 +4085,9 @@ Session::write_one_track (AudioTrack& track, nframes_t start, nframes_t end,
 	// any bigger than this seems to cause stack overflows in called functions
 	const nframes_t chunk_size = (128 * 1024)/4;
 
-	g_atomic_int_set (&processing_prohibited, 1);
+	// block all process callback handling
+
+	block_processing ();
 
 	/* call tree *MUST* hold route_lock */
 
@@ -4211,7 +4213,7 @@ Session::write_one_track (AudioTrack& track, nframes_t start, nframes_t end,
 		}
 	}
 
-	g_atomic_int_set (&processing_prohibited, 0);
+	unblock_processing ();
 
 	return result;
 }