Move all crates to a top-level crates folder

Co-Authored-By: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/gpui/src/platform/mac/dispatcher.rs

@@ -0,0 +1,43 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+use async_task::Runnable;
+use objc::{
+    class, msg_send,
+    runtime::{BOOL, YES},
+    sel, sel_impl,
+};
+use std::ffi::c_void;
+
+use crate::platform;
+
+include!(concat!(env!("OUT_DIR"), "/dispatch_sys.rs"));
+
+pub fn dispatch_get_main_queue() -> dispatch_queue_t {
+    unsafe { &_dispatch_main_q as *const _ as dispatch_queue_t }
+}
+
+pub struct Dispatcher;
+
+impl platform::Dispatcher for Dispatcher {
+    fn is_main_thread(&self) -> bool {
+        let is_main_thread: BOOL = unsafe { msg_send![class!(NSThread), isMainThread] };
+        is_main_thread == YES
+    }
+
+    fn run_on_main_thread(&self, runnable: Runnable) {
+        unsafe {
+            dispatch_async_f(
+                dispatch_get_main_queue(),
+                runnable.into_raw() as *mut c_void,
+                Some(trampoline),
+            );
+        }
+
+        extern "C" fn trampoline(runnable: *mut c_void) {
+            let task = unsafe { Runnable::from_raw(runnable as *mut ()) };
+            task.run();
+        }
+    }
+}