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|
// Take a look at the license at the top of the repository in the LICENSE file.
use std::{
cell::Cell,
sync::atomic::{AtomicBool, Ordering},
};
use crate::ffi;
use glib::translate::*;
#[cfg(target_os = "macos")]
extern "C" {
fn pthread_main_np() -> i32;
}
thread_local! {
static IS_MAIN_THREAD: Cell<bool> = const{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 {
() => {
#[allow(unknown_lints)]
#[allow(clippy::if_then_panic)]
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 {
() => {
assert!(
!crate::rt::is_initialized(),
"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!();
if cfg!(not(feature = "unsafe-assume-initialized")) {
INITIALIZED.load(Ordering::Acquire)
} else {
true
}
}
/// Returns `true` if GTK has been initialized and this is the main thread.
#[inline]
pub fn is_initialized_main_thread() -> bool {
skip_assert_initialized!();
if cfg!(not(feature = "unsafe-assume-initialized")) {
IS_MAIN_THREAD.with(|c| c.get())
} else {
true
}
}
/// 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.
#[allow(unknown_lints)]
#[allow(clippy::if_then_panic)]
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");
}
// OS X has its own notion of the main thread and init must be called on that
// thread.
#[cfg(target_os = "macos")]
{
assert_ne!(
pthread_main_np(),
0,
"Attempted to initialize GTK on OSX from non-main thread"
);
}
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")]
#[allow(unknown_lints)]
#[allow(clippy::if_then_panic)]
pub fn init() -> Result<(), glib::BoolError> {
skip_assert_initialized!();
if is_initialized_main_thread() {
return Ok(());
} else if is_initialized() {
#[cfg(not(test))]
panic!("Attempted to initialize GTK from two different threads.");
#[cfg(test)]
panic!("Use #[gtk::test] instead of #[test]");
}
unsafe {
if from_glib(ffi::gtk_init_check()) {
// See https://github.com/gtk-rs/gtk-rs-core/issues/186 for reasoning behind
// acquiring and leaking the main context here.
let result: bool = from_glib(glib::ffi::g_main_context_acquire(
glib::ffi::g_main_context_default(),
));
if !result {
return Err(glib::bool_error!("Failed to acquire default main context"));
}
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"))
}
}
}
#[cfg(test)]
mod tests {
use crate as gtk4;
#[test]
fn init_should_acquire_default_main_context() {
let context = glib::MainContext::ref_thread_default();
assert!(context.is_owner());
}
}
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