Add a little more event loop debug output

kitty/child-monitor.c

@@ -21,6 +21,12 @@
 #include <signal.h>
 extern PyTypeObject Screen_Type;
 
+#ifdef DEBUG_EVENT_LOOP
+#define EVDBG(...) log_event(__VA_ARGS__)
+#else
+#define EVDBG(...)
+#endif
+
 #define EXTRA_FDS 2
 #ifndef MSG_NOSIGNAL
 // Apple does not implement MSG_NOSIGNAL
@@ -884,6 +890,7 @@ static void process_global_state(void *data);
 
 static void
 do_state_check(id_type timer_id UNUSED, void *data UNUSED) {
+    EVDBG("State check timer fired");
 #ifdef __APPLE__
     process_global_state(data);
 #endif
@@ -896,6 +903,7 @@ static id_type state_check_timer = 0;
 
 static void
 process_global_state(void *data) {
+    EVDBG("Processing global state");
     ChildMonitor *self = data;
     maximum_wait = -1;
     bool state_check_timer_enabled = false;

kitty/data-types.h

@@ -313,3 +313,4 @@ SPRITE_MAP_HANDLE alloc_sprite_map(unsigned int, unsigned int);
 SPRITE_MAP_HANDLE free_sprite_map(SPRITE_MAP_HANDLE);
 
 static inline void safe_close(int fd) { while(close(fd) != 0 && errno == EINTR); }
+void log_event(const char *format, ...) __attribute__((format(printf, 1, 2)));

kitty/glfw.c

@@ -66,6 +66,22 @@ update_os_window_viewport(OSWindow *window, bool notify_boss) {
     }
 }
 
+void
+log_event(const char *format, ...) {
+    if (format)
+    {
+        va_list vl;
+
+        fprintf(stderr, "[%.4f] ", glfwGetTime());
+        va_start(vl, format);
+        vfprintf(stderr, format, vl);
+        va_end(vl);
+        fprintf(stderr, "\n");
+    }
+
+}
+
+
 // callbacks {{{
 
 void