eventloop: loop_schedule_deferred()

Generalize the "schedule schedule" technique.

src/nvim/aucmd.c

@@ -5,7 +5,6 @@
 #include "nvim/fileio.h"
 #include "nvim/vim.h"
 #include "nvim/main.h"
-#include "nvim/screen.h"
 #include "nvim/ui.h"
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
@@ -18,16 +17,12 @@ static void focusgained_event(void **argv)
   do_autocmd_focusgained(*gainedp);
   xfree(gainedp);
 }
-static void schedule_event(void **argv)
-{
-  bool *gainedp = argv[0];
-  multiqueue_put(main_loop.events, focusgained_event, 1, gainedp);
-}
 void aucmd_schedule_focusgained(bool gained)
 {
   bool *gainedp = xmalloc(sizeof(*gainedp));
   *gainedp = gained;
-  loop_schedule(&main_loop, event_create(schedule_event, 1, gainedp));
+  loop_schedule_deferred(&main_loop,
+                         event_create(focusgained_event, 1, gainedp));
 }
 
 static void do_autocmd_focusgained(bool gained)

src/nvim/event/loop.c

@@ -74,6 +74,24 @@ void loop_schedule(Loop *loop, Event event)
   uv_mutex_unlock(&loop->mutex);
 }
 
+/// Schedules an event from another thread. Unlike loop_schedule(), the event
+/// is forwarded to `Loop.events`, instead of being processed immediately.
+///
+/// @see loop_schedule
+void loop_schedule_deferred(Loop *loop, Event event)
+{
+  Event *eventp = xmalloc(sizeof(*eventp));
+  *eventp = event;
+  loop_schedule(loop, event_create(loop_deferred_event, 2, loop, eventp));
+}
+static void loop_deferred_event(void **argv)
+{
+  Loop *loop = argv[0];
+  Event *eventp = argv[1];
+  multiqueue_put_event(loop->events, *eventp);
+  xfree(eventp);
+}
+
 void loop_on_put(MultiQueue *queue, void *data)
 {
   Loop *loop = data;