implement os wakeup

src/linux/window_manager/linux_window_manager.c

@@ -68,6 +68,10 @@ wm_init(void)
       lnx_wm_state->cursors[map[idx].cursor] = XCreateFontCursor(lnx_wm_state->display, map[idx].id);
     }
   }
+
+  // create wakeup event for polling
+  os_lnx_gfx_state->wakeup_fd = eventfd(0, EFD_CLOEXEC);
+  Assert(os_lnx_gfx_state->wakeup_fd > 0);
 }
 
 ////////////////////////////////
@@ -398,17 +402,38 @@ wm_dpi_from_monitor(WM_Monitor monitor)
 internal void
 wm_send_wakeup_event(void)
 {
-  // TODO(rjf)
+  U64 dummy = 1;
+  ssize_t size = OS_LNX_RETRY_ON_EINTR(write(os_lnx_gfx_state->wakeup_fd, &dummy, sizeof(dummy)));
+  Assert(size == sizeof(dummy));
 }
 
 internal WM_EventList
 wm_get_events(Arena *arena, B32 wait)
 {
   WM_EventList evts = {0};
-  for(;XPending(lnx_wm_state->display) > 0 || (wait && evts.count == 0);)
+  for(;;)
+  {
+    if(XPending(os_lnx_gfx_state->display) == 0)
+    {
+      struct pollfd poll_fds[2] =
+      {
+        { .fd = ConnectionNumber(os_lnx_gfx_state->display), .events = POLLIN },
+        { .fd = os_lnx_gfx_state->wakeup_fd,                 .events = POLLIN },
+      };
+      int timeout = wait && evts.count == 0 ? -1 : 0;
+      int poll_status = poll(poll_fds, ArrayCount(poll_fds), timeout);
+      Assert(poll_status >= 0);
+      if(poll_fds[1].revents & POLLIN)
+      {
+        U64 dummy = 0;
+        read(os_lnx_gfx_state->wakeup_fd, &dummy, sizeof(dummy));
+        wait = 0;
+      }
+    }
+    while(XPending(os_lnx_gfx_state->display))
     {
       XEvent evt = {0};
-    XNextEvent(lnx_wm_state->display, &evt);
+      XNextEvent(os_lnx_gfx_state->display, &evt);
       B32 set_mouse_cursor = 0;
       switch(evt.type)
       {
@@ -618,6 +643,7 @@ wm_get_events(Arena *arena, B32 wait)
         }
       }break;
       }
+      
       if(set_mouse_cursor)
       {
         Window root_window = 0;
@@ -627,10 +653,11 @@ wm_get_events(Arena *arena, B32 wait)
         int child_rel_x = 0;
         int child_rel_y = 0;
         unsigned int mask = 0;
-      if(XQueryPointer(lnx_wm_state->display, XDefaultRootWindow(lnx_wm_state->display), &root_window, &child_window, &root_rel_x, &root_rel_y, &child_rel_x, &child_rel_y, &mask))
+        if(XQueryPointer(os_lnx_gfx_state->display, XDefaultRootWindow(os_lnx_gfx_state->display), &root_window, &child_window, &root_rel_x, &root_rel_y, &child_rel_x, &child_rel_y, &mask))
         {
-        XDefineCursor(lnx_wm_state->display, root_window, lnx_wm_state->cursors[lnx_wm_state->last_set_cursor]);
+          XDefineCursor(os_lnx_gfx_state->display, root_window, os_lnx_gfx_state->cursors[os_lnx_gfx_state->last_set_cursor]);
-        XFlush(lnx_wm_state->display);
+          XFlush(os_lnx_gfx_state->display);
+        }
       }
     }
   }

src/linux/window_manager/linux_window_manager.h

@@ -13,6 +13,8 @@
 #include <X11/extensions/sync.h>
 #include <X11/keysym.h>
 #include <X11/keysymdef.h>
+#include <poll.h>
+#include <sys/eventfd.h>
 
 ////////////////////////////////
 //~ rjf: Window State
@@ -46,6 +48,7 @@ struct LNX_WM_State
   Cursor cursors[WM_Cursor_COUNT];
   WM_Cursor last_set_cursor;
   WM_SystemInfo gfx_info;
+  int wakeup_fd;
 };
 
 ////////////////////////////////

src/metagen/metagen_os/core/linux/metagen_os_core_linux.h

@@ -0,0 +1 @@
+