redesign cross-thread registration/signalling system

This new design will work even when threads that need to receive
messages from RT threads are created *after* the RT threads. The
existing design would fail because the RT thread(s) would never
be known the later created threads, and so signals emitted by the
RT thread and causing call_slot() in the receiver would end up
being enqueued using a lock-protected list. The new design ensures
that communication always uses a lock-free FIFO instead

1 files changed, 8 insertions, 2 deletions

diff --git a/libs/surfaces/mackie/interface.cc b/libs/surfaces/mackie/interface.cc
index 1a9760bcbe..3b04770660 100644
--- a/libs/surfaces/mackie/interface.cc
+++ b/libs/surfaces/mackie/interface.cc
@@ -74,6 +74,12 @@ probe_mackie_protocol (ControlProtocolDescriptor*)
 	return MackieControlProtocol::probe();
 }
 
+static void*
+mackie_request_buffer_factory (uint32_t num_requests)
+{
+	return MackieControlProtocol::request_factory (num_requests);
+}
+
 // Field names commented out by JE - 06-01-2010
 static ControlProtocolDescriptor mackie_descriptor = {
 	/*name :              */   "Mackie",
@@ -88,8 +94,8 @@ static ControlProtocolDescriptor mackie_descriptor = {
 	/*supports_feedback : */   false,
 	/*probe :             */   probe_mackie_protocol,
 	/*initialize :        */   new_mackie_protocol,
-	/*destroy :           */   delete_mackie_protocol
+	/*destroy :           */   delete_mackie_protocol,
+	/*request_buffer_factory */ mackie_request_buffer_factory
 };
 
-
 extern "C" ARDOURSURFACE_API ControlProtocolDescriptor* protocol_descriptor () { return &mackie_descriptor; }