io_thread: add function io_thread_run()

src/io_thread.c

@@ -31,13 +31,19 @@ static struct {
 	GThread *thread;
 } io;
 
-static gpointer
-io_thread_func(G_GNUC_UNUSED gpointer arg)
+void
+io_thread_run(void)
 {
 	assert(io.context != NULL);
 	assert(io.loop != NULL);
 
 	g_main_loop_run(io.loop);
+}
+
+static gpointer
+io_thread_func(G_GNUC_UNUSED gpointer arg)
+{
+	io_thread_run();
 	return NULL;
 }
 

src/io_thread.h

@@ -29,6 +29,14 @@ io_thread_init(void);
 bool
 io_thread_start(GError **error_r);
 
+/**
+ * Run the I/O event loop synchronously in the current thread.  This
+ * can be called instead of io_thread_start().  For testing purposes
+ * only.
+ */
+void
+io_thread_run(void);
+
 void
 io_thread_deinit(void);