From 3a715c7e0d5cbb39ffd6816899ef3050e8331882 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Sat, 2 May 2020 21:37:14 +0200
Subject: Try to start _writer on-demand on macOS (#1739).

---
 src/tools/dcpomatic_disk.cc        | 6 +++++-
 src/tools/dcpomatic_disk_writer.cc | 8 ++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/tools/dcpomatic_disk.cc b/src/tools/dcpomatic_disk.cc
index 6f72bfed0..b2678ce42 100644
--- a/src/tools/dcpomatic_disk.cc
+++ b/src/tools/dcpomatic_disk.cc
@@ -42,6 +42,7 @@
 #endif
 #ifdef DCPOMATIC_OSX
 #include <ApplicationServices/ApplicationServices.h>
+#include <notify.h>
 #endif
 
 using std::string;
@@ -132,7 +133,10 @@ public:
 		_writer = new boost::process::child (disk_writer_path());
 #endif
 
-		/* _writer is always running on macOS at the moment */
+#ifdef DCPOMATIC_OSX
+		LOG_DISK_NC("Sending notification to writer daemon");
+		notify_post ("com.dcpomatic.disk.writer.start");
+#endif
 	}
 
 	~DOMFrame ()
diff --git a/src/tools/dcpomatic_disk_writer.cc b/src/tools/dcpomatic_disk_writer.cc
index 66f347943..d5599f25b 100644
--- a/src/tools/dcpomatic_disk_writer.cc
+++ b/src/tools/dcpomatic_disk_writer.cc
@@ -48,6 +48,7 @@ extern "C" {
 extern "C" {
 #include <lwext4/file_dev.h>
 }
+#include <xpc/xpc.h>
 #endif
 
 #ifdef DCPOMATIC_LINUX
@@ -520,6 +521,13 @@ main ()
 	LOG_DISK_NC("dcpomatic_disk_writer started");
 #endif
 
+#ifdef DCPOMATIC_OSX
+	/* I *think* this confumes the notifyd event that we used to start the process, so we only
+	 * get started once per notification.
+	 */
+        xpc_set_event_stream_handler("com.apple.notifyd.matching", DISPATCH_TARGET_QUEUE_DEFAULT, ^(xpc_object_t event) {});
+#endif
+
 	try {
 		nanomsg = new Nanomsg (false);
 	} catch (runtime_error& e) {
-- 
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