animate/
rt.rs

1#![allow(clippy::missing_safety_doc)]
2
3use std::cell::Cell;
4use std::ptr;
5use std::sync::atomic::{AtomicBool, Ordering};
6
7thread_local! {
8    static IS_MAIN_THREAD: Cell<bool> = Cell::new(false)
9}
10
11static INITIALIZED: AtomicBool = AtomicBool::new(false);
12
13/// Asserts that this is the main thread and either `clutter::init` has been called.
14macro_rules! assert_initialized_main_thread {
15    () => {
16        if !crate::rt::is_initialized_main_thread() {
17            if crate::rt::is_initialized() {
18                panic!("GDK may only be used from the main thread.");
19            } else {
20                panic!("GDK has not been initialized. Call `clutter::init` first.");
21            }
22        }
23    };
24}
25
26/// No-op.
27macro_rules! skip_assert_initialized {
28    () => {};
29}
30
31/// Asserts that neither `clutter::init` has been called.
32macro_rules! assert_not_initialized {
33    () => {
34        if crate::rt::is_initialized() {
35            panic!("This function has to be called before `clutter::init`.");
36        }
37    };
38}
39
40/// Returns `true` if GDK has been initialized.
41#[inline]
42pub fn is_initialized() -> bool {
43    skip_assert_initialized!();
44    INITIALIZED.load(Ordering::Acquire)
45}
46
47/// Returns `true` if GDK has been initialized and this is the main thread.
48#[inline]
49pub fn is_initialized_main_thread() -> bool {
50    skip_assert_initialized!();
51    IS_MAIN_THREAD.with(|c| c.get())
52}
53
54/// Informs this crate that GDK has been initialized and the current thread is the main one.
55pub unsafe fn set_initialized() {
56    skip_assert_initialized!();
57    if is_initialized_main_thread() {
58        return;
59    } else if is_initialized() {
60        panic!("Attempted to initialize GDK from two different threads.");
61    }
62    INITIALIZED.store(true, Ordering::Release);
63    IS_MAIN_THREAD.with(|c| c.set(true));
64}
65
66pub fn init() {
67    assert_not_initialized!();
68    unsafe {
69        ffi::clutter_init(ptr::null_mut(), ptr::null_mut());
70        set_initialized();
71    }
72}
73
74pub fn run() {
75    assert_initialized_main_thread!();
76    unsafe {
77        ffi::clutter_main();
78        set_initialized();
79    }
80}
81
82pub fn quit() {
83    assert_initialized_main_thread!();
84    unsafe {
85        ffi::clutter_main_quit();
86    }
87}
animate/rt.rs

animate/
rt.rs
