From 1fe717e9125e896c92f281922e87f8158b15c7af Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Sat, 6 Aug 2022 22:57:58 +0200
Subject: [PATCH] Allow cancellation of un-started jobs (#2777).

---
 src/lib/job.cc           | 14 ++++++--------
 test/job_manager_test.cc | 22 ++++++++++++++++++++++
 2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/src/lib/job.cc b/src/lib/job.cc
index 5bed3f0d2..8f0a7474f 100644
--- a/src/lib/job.cc
+++ b/src/lib/job.cc
@@ -589,17 +589,15 @@ Job::remaining_time () const
 void
 Job::cancel ()
 {
-	if (!_thread.joinable()) {
-		return;
-	}
+	if (_thread.joinable()) {
+		if (paused_by_user() || paused_by_priority()) {
+			resume ();
+		}
 
-	if (paused_by_user() || paused_by_priority()) {
-		resume ();
+		_thread.interrupt ();
+		_thread.join ();
 	}
 
-	_thread.interrupt ();
-	_thread.join ();
-
 	set_state (FINISHED_CANCELLED);
 }
 
diff --git a/test/job_manager_test.cc b/test/job_manager_test.cc
index e11423575..4a2f8bde5 100644
--- a/test/job_manager_test.cc
+++ b/test/job_manager_test.cc
@@ -65,6 +65,7 @@ public:
 			if (finished ()) {
 				return;
 			}
+			boost::this_thread::interruption_point();
 		}
 	}
 
@@ -139,3 +140,24 @@ BOOST_AUTO_TEST_CASE (job_manager_test2)
 	BOOST_REQUIRE (!wait_for_jobs());
 }
 
+
+BOOST_AUTO_TEST_CASE(cancel_job_test)
+{
+	shared_ptr<Film> film;
+
+	vector<shared_ptr<TestJob>> jobs;
+	for (int i = 0; i < 2; ++i) {
+		auto job = make_shared<TestJob>(film);
+		jobs.push_back(job);
+		JobManager::instance()->add(job);
+	}
+
+	jobs[1]->cancel();
+	jobs[0]->cancel();
+
+	dcpomatic_sleep_seconds(1);
+
+	BOOST_CHECK(jobs[0]->finished_cancelled());
+	BOOST_CHECK(jobs[1]->finished_cancelled());
+}
+
-- 
2.30.2