tunnel-sink-new: reinit module

When configured, reinitialize the module instead of exiting.  This
allows a restart/reconnect, but the module to appear to always be alive
when the user does: "pactl list modules".  (The sink will still not
exist until the tcp connection is established.)

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/688>

src/modules/restart-module.h

@@ -0,0 +1,41 @@
+/***
+    This file is part of PulseAudio.
+
+    Copyright 2022 Craig Howard
+
+    PulseAudio is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published
+    by the Free Software Foundation; either version 2.1 of the License,
+    or (at your option) any later version.
+
+    PulseAudio is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+    General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifndef RESTART_MODULE_H
+#define RESTART_MODULE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <pulse/timeval.h>
+
+#include <pulsecore/core.h>
+#include <pulsecore/thread-mq.h>
+
+typedef int (*init_cb)(pa_module *m);
+typedef void (*done_cb)(pa_module *m);
+
+void pa_restart_module_reinit(pa_module *m, init_cb do_init, done_cb do_done, pa_usec_t restart_usec);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif