Make digest calculations interruptible.

3 files changed, 72 insertions, 10 deletions

diff --git a/src/lib/reel_writer.cc b/src/lib/reel_writer.cc
index cd6a1a4b9..a3d499abe 100644
--- a/src/lib/reel_writer.cc
+++ b/src/lib/reel_writer.cc
@@ -745,6 +745,7 @@ ReelWriter::create_reel (
 
 void
 ReelWriter::calculate_digests (boost::function<void (float)> set_progress)
+try
 {
 	if (_picture_asset) {
 		_picture_asset->hash (set_progress);
@@ -757,6 +758,10 @@ ReelWriter::calculate_digests (boost::function<void (float)> set_progress)
 	if (_atmos_asset) {
 		_atmos_asset->hash (set_progress);
 	}
+} catch (boost::thread_interrupted) {
+	/* set_progress contains an interruption_point, so any of these methods
+	 * may throw thread_interrupted, at which point we just give up.
+	 */
 }
 
 Frame
diff --git a/src/lib/writer.cc b/src/lib/writer.cc
index 8fa9fbbca..b749968a7 100644
--- a/src/lib/writer.cc
+++ b/src/lib/writer.cc
@@ -74,14 +74,6 @@ using dcp::ArrayData;
 using namespace dcpomatic;
 
 
-static
-void
-ignore_progress (float)
-{
-
-}
-
-
 /** @param j Job to report progress to, or 0.
  *  @param text_only true to enable only the text (subtitle/ccap) parts of the writer.
  */
@@ -558,7 +550,9 @@ Writer::calculate_digests ()
 	if (job) {
 		set_progress = boost::bind (&Writer::set_digest_progress, this, job.get(), _1);
 	} else {
-		set_progress = &ignore_progress;
+		set_progress = [](float) {
+			boost::this_thread::interruption_point();
+		};
 	}
 
 	for (auto& i: _reels) {
@@ -568,7 +562,13 @@ Writer::calculate_digests ()
 
 	work.reset ();
 
-	{
+	try {
+		pool.join_all ();
+	} catch (boost::thread_interrupted) {
+		/* join_all was interrupted, so we need to interrupt the threads
+		 * in our pool then try again to join them.
+		 */
+		pool.interrupt_all ();
 		pool.join_all ();
 	}
 
@@ -941,12 +941,15 @@ Writer::set_digest_progress (Job* job, float progress)
 
 	Waker waker;
 	waker.nudge ();
+
+	boost::this_thread::interruption_point();
 }
 
 
 /** Calculate hashes for any referenced MXF assets which do not already have one */
 void
 Writer::calculate_referenced_digests (boost::function<void (float)> set_progress)
+try
 {
 	for (auto const& i: _reel_assets) {
 		auto file = dynamic_pointer_cast<dcp::ReelFileAsset>(i.asset);
@@ -955,6 +958,10 @@ Writer::calculate_referenced_digests (boost::function<void (float)> set_progress
 			file->set_hash (file->asset_ref().asset()->hash());
 		}
 	}
+} catch (boost::thread_interrupted) {
+	/* set_progress contains an interruption_point, so any of these methods
+	 * may throw thread_interrupted, at which point we just give up.
+	 */
 }
 
 
diff --git a/test/writer_test.cc b/test/writer_test.cc
index dade4d6b4..cb97cf78a 100644
--- a/test/writer_test.cc
+++ b/test/writer_test.cc
@@ -22,11 +22,14 @@
 #include "lib/audio_buffers.h"
 #include "lib/content.h"
 #include "lib/content_factory.h"
+#include "lib/cross.h"
 #include "lib/film.h"
 #include "lib/job.h"
 #include "lib/video_content.h"
 #include "lib/writer.h"
 #include "test.h"
+#include <dcp/openjpeg_image.h>
+#include <dcp/j2k_transcode.h>
 #include <boost/test/unit_test.hpp>
 #include <memory>
 
@@ -47,3 +50,50 @@ BOOST_AUTO_TEST_CASE (test_write_odd_amount_of_silence)
 	writer->write (audio, dcpomatic::DCPTime(1));
 }
 
+
+BOOST_AUTO_TEST_CASE (interrupt_writer)
+{
+	auto film = new_test_film2 ("test_interrupt_writer");
+
+	auto content = content_factory("test/data/check_image0.png").front();
+	film->examine_and_add_content (content);
+	BOOST_REQUIRE (!wait_for_jobs());
+
+	/* Add some dummy content to the film so that it has a reel of the right length */
+	auto constexpr frames = 24 * 60 * 60;
+	content->video->set_length (frames);
+
+	/* Make a random J2K image */
+	auto size = dcp::Size(1998, 1080);
+	auto image = make_shared<dcp::OpenJPEGImage>(size);
+	for (int i = 0; i < 3; ++i) {
+		for (int j = 0; j < (size.width * size.height); ++j) {
+			image->data(i)[j] = rand();
+		}
+	}
+
+	/* Write some data */
+	auto video = dcp::compress_j2k(image, 100000000, 24, false, false);
+	auto video_ptr = make_shared<dcp::ArrayData>(video.data(), video.size());
+	auto audio = make_shared<AudioBuffers>(6, 48000 / 24);
+
+	auto writer = make_shared<Writer>(film, shared_ptr<Job>());
+	writer->start ();
+
+	for (int i = 0; i < frames; ++i) {
+		writer->write (video_ptr, i, Eyes::BOTH);
+		writer->write (audio, dcpomatic::DCPTime::from_frames(i, 24));
+	}
+
+	/* Start digest calculations then abort them; there should be no crash or error */
+	boost::thread thread([film, writer]() {
+		writer->finish(film->dir(film->dcp_name()));
+	});
+
+	dcpomatic_sleep_seconds	(1);
+
+	thread.interrupt ();
+
+	dcpomatic_sleep_seconds (1);
+}
+