+
+/* GLib 2.31 and beyond deprecated various parts of the thread API,
+ * but the new interfaces are not available in older GLib versions
+ * so we have to cope with both.
+ */
+#if GLIB_CHECK_VERSION(2, 31, 0)
+/* Default zero-initialisation is sufficient for 2.31+ GCond */
+static GCond the_coroutine_cond;
+static GCond *coroutine_cond = &the_coroutine_cond;
+static inline void init_coroutine_cond(void)
+{
+}
+
+/* Awkwardly, the GPrivate API doesn't provide a way to update the
+ * GDestroyNotify handler for the coroutine key dynamically. So instead
+ * we track whether or not the CoroutineGThread should be freed on
+ * thread exit / coroutine key update using the free_on_thread_exit
+ * field.
+ */
+static void coroutine_destroy_notify(gpointer data)
+{
+ CoroutineGThread *co = data;
+ if (co && co->free_on_thread_exit) {
+ g_free(co);
+ }
+}
+
+static GPrivate coroutine_key = G_PRIVATE_INIT(coroutine_destroy_notify);
+
+static inline CoroutineGThread *get_coroutine_key(void)
+{
+ return g_private_get(&coroutine_key);
+}
+
+static inline void set_coroutine_key(CoroutineGThread *co,
+ bool free_on_thread_exit)
+{
+ /* Unlike g_static_private_set() this does not call the GDestroyNotify
+ * if the previous value of the key was NULL. Fortunately we only need
+ * the GDestroyNotify in the non-NULL key case.
+ */
+ co->free_on_thread_exit = free_on_thread_exit;
+ g_private_replace(&coroutine_key, co);
+}
+
+static inline GThread *create_thread(GThreadFunc func, gpointer data)
+{
+ return g_thread_new("coroutine", func, data);
+}
+
+#else
+
+/* Handle older GLib versions */
+static GCond *coroutine_cond;
+static inline void init_coroutine_cond(void)
+{
+ coroutine_cond = g_cond_new();
+}
+