1 files changed, 58 insertions, 0 deletions
diff --git a/dom/workers/WorkerStatus.h b/dom/workers/WorkerStatus.h
new file mode 100644
index 0000000000..696abc5d2c
--- /dev/null
+++ b/dom/workers/WorkerStatus.h
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_workers_WorkerStatus_h
+#define mozilla_dom_workers_WorkerStatus_h
+
+namespace mozilla::dom {
+
+/**
+ * Use this chart to help figure out behavior during each of the closing
+ * statuses. Details below.
+ *
+ * +========================================================+
+ * |                     Closing Statuses                   |
+ * +=============+=============+=================+==========+
+ * |    status   | clear queue | abort execution | notified |
+ * +=============+=============+=================+==========+
+ * |   Closing   |     yes     |       no        |    no    |
+ * +-------------+-------------+-----------------+----------+
+ * |  Canceling  |     yes     |       yes       |   yes    |
+ * +-------------+-------------+-----------------+----------+
+ * |   Killing   |     yes     |       yes       |   yes    |
+ * +-------------+-------------+-----------------+----------+
+ */
+
+enum WorkerStatus {
+  // Not yet scheduled.
+  Pending = 0,
+
+  // This status means that the worker is active.
+  Running,
+
+  // Inner script called close() on the worker global scope. Setting this
+  // status causes the worker to clear its queue of events but does not abort
+  // the currently running script. WorkerRef objects are not going to be
+  // notified because the behavior of APIs/Components should not change during
+  // this status yet.
+  Closing,
+
+  // Either the user navigated away from the owning page or the owning page fell
+  // out of bfcache. Setting this status causes the worker to abort immediately.
+  // Since the page has gone away the worker may not post any messages.
+  Canceling,
+
+  // The application is shutting down. Setting this status causes the worker to
+  // abort immediately.
+  Killing,
+
+  // The worker is effectively dead.
+  Dead
+};
+
+}  // namespace mozilla::dom
+
+#endif /* mozilla_dom_workers_WorkerStatus_h */