1#![allow(non_upper_case_globals)]
  2#![allow(non_camel_case_types)]
  3#![allow(non_snake_case)]
  4
  5use crate::PlatformDispatcher;
  6use async_task::Runnable;
  7use objc::{
  8    class, msg_send,
  9    runtime::{BOOL, YES},
 10    sel, sel_impl,
 11};
 12use parking::{Parker, Unparker};
 13use parking_lot::Mutex;
 14use std::{
 15    ffi::c_void,
 16    sync::Arc,
 17    time::{Duration, SystemTime},
 18};
 19
 20include!(concat!(env!("OUT_DIR"), "/dispatch_sys.rs"));
 21
 22pub fn dispatch_get_main_queue() -> dispatch_queue_t {
 23    unsafe { &_dispatch_main_q as *const _ as dispatch_queue_t }
 24}
 25
 26pub struct MacDispatcher {
 27    parker: Arc<Mutex<Parker>>,
 28}
 29
 30impl MacDispatcher {
 31    pub fn new() -> Self {
 32        MacDispatcher {
 33            parker: Arc::new(Mutex::new(Parker::new())),
 34        }
 35    }
 36}
 37
 38impl PlatformDispatcher for MacDispatcher {
 39    fn is_main_thread(&self) -> bool {
 40        let is_main_thread: BOOL = unsafe { msg_send![class!(NSThread), isMainThread] };
 41        is_main_thread == YES
 42    }
 43
 44    fn dispatch(&self, runnable: Runnable) {
 45        unsafe {
 46            dispatch_async_f(
 47                dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT.try_into().unwrap(), 0),
 48                runnable.into_raw() as *mut c_void,
 49                Some(trampoline),
 50            );
 51        }
 52    }
 53
 54    fn dispatch_on_main_thread(&self, runnable: Runnable) {
 55        unsafe {
 56            dispatch_async_f(
 57                dispatch_get_main_queue(),
 58                runnable.into_raw() as *mut c_void,
 59                Some(trampoline),
 60            );
 61        }
 62    }
 63
 64    fn dispatch_after(&self, duration: Duration, runnable: Runnable) {
 65        let now = SystemTime::now();
 66        let after_duration = now
 67            .duration_since(SystemTime::UNIX_EPOCH)
 68            .unwrap()
 69            .as_nanos() as u64
 70            + duration.as_nanos() as u64;
 71        unsafe {
 72            let queue =
 73                dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT.try_into().unwrap(), 0);
 74            let when = dispatch_time(0, after_duration as i64);
 75            dispatch_after_f(
 76                when,
 77                queue,
 78                runnable.into_raw() as *mut c_void,
 79                Some(trampoline),
 80            );
 81        }
 82    }
 83
 84    fn poll(&self, _background_only: bool) -> bool {
 85        false
 86    }
 87
 88    fn park(&self) {
 89        self.parker.lock().park()
 90    }
 91
 92    fn unparker(&self) -> Unparker {
 93        self.parker.lock().unparker()
 94    }
 95}
 96
 97extern "C" fn trampoline(runnable: *mut c_void) {
 98    let task = unsafe { Runnable::from_raw(runnable as *mut ()) };
 99    task.run();
100}