1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
// Take a look at the license at the top of the repository in the LICENSE file.
use glib::translate::*;
use std::cell::Cell;
use std::sync::atomic::{AtomicBool, Ordering};
thread_local! {
static IS_MAIN_THREAD: Cell<bool> = Cell::new(false)
}
static INITIALIZED: AtomicBool = AtomicBool::new(false);
// rustdoc-stripper-ignore-next
/// Asserts that this is the main thread and `gtk::init` has been called.
macro_rules! assert_initialized_main_thread {
() => {
if !crate::rt::is_initialized_main_thread() {
if crate::rt::is_initialized() {
panic!("GTK may only be used from the main thread.");
} else {
panic!("GTK has not been initialized. Call `gtk::init` first.");
}
}
};
}
/// No-op.
macro_rules! skip_assert_initialized {
() => {};
}
/// Asserts that `gtk::init` has not been called.
#[allow(unused_macros)]
macro_rules! assert_not_initialized {
() => {
if crate::rt::is_initialized() {
panic!("This function has to be called before `gtk::init`.");
}
};
}
/// Returns `true` if GTK has been initialized.
#[inline]
pub fn is_initialized() -> bool {
skip_assert_initialized!();
INITIALIZED.load(Ordering::Acquire)
}
/// Returns `true` if GTK has been initialized and this is the main thread.
#[inline]
pub fn is_initialized_main_thread() -> bool {
skip_assert_initialized!();
IS_MAIN_THREAD.with(|c| c.get())
}
/// Informs this crate that GTK has been initialized and the current thread is the main one.
///
/// # Panics
///
/// This function will panic if you attempt to initialize GTK from more than
/// one thread.
///
/// # Safety
///
/// You must only call this if:
///
/// 1. You have initialized the underlying GTK library yourself.
/// 2. You did 1 on the thread with which you are calling this function
/// 3. You ensure that this thread is the main thread for the process.
pub unsafe fn set_initialized() {
skip_assert_initialized!();
if is_initialized_main_thread() {
return;
} else if is_initialized() {
panic!("Attempted to initialize GTK from two different threads.");
} else if !{ from_glib(ffi::gtk_is_initialized()) } {
panic!("GTK was not actually initialized");
}
INITIALIZED.store(true, Ordering::Release);
IS_MAIN_THREAD.with(|c| c.set(true));
}
/// Tries to initialize GTK.
///
/// Call either this function or [`Application::new`][new] before using any
/// other GTK functions.
///
/// [new]: struct.Application.html#method.new
///
/// Note that this function calls `gtk_init_check()` rather than `gtk_init()`,
/// so will not cause the program to terminate if GTK could not be initialized.
/// Instead, an Ok is returned if the windowing system was successfully
/// initialized otherwise an Err is returned.
#[doc(alias = "gtk_init")]
pub fn init() -> Result<(), glib::BoolError> {
skip_assert_initialized!();
if is_initialized_main_thread() {
return Ok(());
} else if is_initialized() {
panic!("Attempted to initialize GTK from two different threads.");
}
unsafe {
if from_glib(ffi::gtk_init_check()) {
if !from_glib::<glib::ffi::gboolean, bool>(ffi::gtk_is_initialized()) {
return Err(glib::bool_error!("GTK was not actually initialized"));
}
set_initialized();
Ok(())
} else {
Err(glib::bool_error!("Failed to initialize GTK"))
}
}
}