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use ffi;
use translate::*;
use std::mem::transmute;
use std::mem;
use ffi as glib_ffi;
use ffi::{gpointer, gboolean};
use MainContext;
use Source;
use SourceId;
use source::Priority;
impl MainContext {
pub fn prepare(&self) -> (bool, i32) {
unsafe {
let mut priority = mem::uninitialized();
let res = from_glib(ffi::g_main_context_prepare(self.to_glib_none().0, &mut priority));
(res, priority)
}
}
pub fn find_source_by_id(&self, source_id: &SourceId) -> Option<Source> {
unsafe {
from_glib_none(ffi::g_main_context_find_source_by_id(self.to_glib_none().0, source_id.to_glib()))
}
}
pub fn invoke<F>(&self, func: F)
where F: FnOnce() + Send + 'static {
self.invoke_with_priority(::PRIORITY_DEFAULT_IDLE, func);
}
pub fn invoke_with_priority<F>(&self, priority: Priority, func: F)
where F: FnOnce() + Send + 'static {
unsafe {
self.invoke_unsafe(priority, func);
}
}
pub fn invoke_local<F>(&self, func: F)
where F: FnOnce() + 'static {
self.invoke_local_with_priority(::PRIORITY_DEFAULT_IDLE, func);
}
pub fn invoke_local_with_priority<F>(&self, priority: Priority, func: F)
where F: FnOnce() + 'static {
unsafe {
assert!(self.is_owner());
self.invoke_unsafe(priority, func);
}
}
unsafe fn invoke_unsafe<F>(&self, priority: Priority, func: F)
where F: FnOnce() + 'static {
let func = Box::into_raw(Box::new(Some(func)));
glib_ffi::g_main_context_invoke_full(self.to_glib_none().0, priority.to_glib(), Some(trampoline::<F>),
func as gpointer, Some(destroy_closure::<F>))
}
pub fn with_thread_default<R, F: Sized>(&self, func: F) -> R
where F: FnOnce() -> R {
let _thread_default = ThreadDefaultContext::new(self);
func()
}
}
#[cfg_attr(feature = "cargo-clippy", allow(transmute_ptr_to_ref))]
unsafe extern "C" fn trampoline<F: FnOnce() + 'static>(func: gpointer) -> gboolean {
let func: &mut Option<F> = transmute(func);
let func = func.take().expect("MainContext::invoke() closure called multiple times");
func();
glib_ffi::G_SOURCE_REMOVE
}
unsafe extern "C" fn destroy_closure<F: FnOnce() + 'static>(ptr: gpointer) {
Box::<Option<F>>::from_raw(ptr as *mut _);
}
struct ThreadDefaultContext<'a>(&'a MainContext);
impl<'a> ThreadDefaultContext<'a> {
fn new(ctx: &MainContext) -> ThreadDefaultContext {
ctx.push_thread_default();
ThreadDefaultContext(ctx)
}
}
impl<'a> Drop for ThreadDefaultContext<'a> {
fn drop(&mut self) {
self.0.pop_thread_default();
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::panic;
use std::ptr;
use std::thread;
#[test]
fn test_invoke() {
let c = MainContext::new();
let l = ::MainLoop::new(&c, false);
let l_clone = l.clone();
thread::spawn(move || {
c.invoke(move || l_clone.quit());
});
l.run();
}
fn is_same_context(a: &MainContext, b: &MainContext) -> bool {
ptr::eq(a.to_glib_none().0, b.to_glib_none().0)
}
#[test]
fn test_with_thread_default() {
let a = MainContext::new();
let b = MainContext::new();
assert!(!is_same_context(&a, &b));
a.with_thread_default(|| {
let t = MainContext::get_thread_default().unwrap();
assert!(is_same_context(&a, &t));
&b.with_thread_default(|| {
let t = MainContext::get_thread_default().unwrap();
assert!(is_same_context(&b, &t));
});
let t = MainContext::get_thread_default().unwrap();
assert!(is_same_context(&a, &t));
});
}
#[test]
fn test_with_thread_default_is_panic_safe() {
let a = MainContext::new();
let b = MainContext::new();
assert!(!is_same_context(&a, &b));
a.with_thread_default(|| {
let t = MainContext::get_thread_default().unwrap();
assert!(is_same_context(&a, &t));
let result = panic::catch_unwind(|| {
&b.with_thread_default(|| {
panic!();
});
});
assert!(result.is_err());
let t = MainContext::get_thread_default().unwrap();
assert!(is_same_context(&a, &t));
});
}
}