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//! Thread local runtime context
use crate::runtime::Handle;
use std::cell::RefCell;
thread_local! {
static CONTEXT: RefCell<Option<Handle>> = RefCell::new(None)
}
pub(crate) fn current() -> Option<Handle> {
CONTEXT.with(|ctx| ctx.borrow().clone())
}
cfg_io_driver! {
pub(crate) fn io_handle() -> crate::runtime::driver::IoHandle {
CONTEXT.with(|ctx| {
let ctx = ctx.borrow();
ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).io_handle.clone()
})
}
}
cfg_signal_internal! {
#[cfg(unix)]
pub(crate) fn signal_handle() -> crate::runtime::driver::SignalHandle {
CONTEXT.with(|ctx| {
let ctx = ctx.borrow();
ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).signal_handle.clone()
})
}
}
cfg_time! {
pub(crate) fn time_handle() -> crate::runtime::driver::TimeHandle {
CONTEXT.with(|ctx| {
let ctx = ctx.borrow();
ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).time_handle.clone()
})
}
cfg_test_util! {
pub(crate) fn clock() -> Option<crate::runtime::driver::Clock> {
CONTEXT.with(|ctx| (*ctx.borrow()).as_ref().map(|ctx| ctx.clock.clone()))
}
}
}
cfg_rt! {
pub(crate) fn spawn_handle() -> Option<crate::runtime::Spawner> {
CONTEXT.with(|ctx| (*ctx.borrow()).as_ref().map(|ctx| ctx.spawner.clone()))
}
}
/// Set this [`Handle`] as the current active [`Handle`].
///
/// [`Handle`]: Handle
pub(crate) fn enter(new: Handle) -> EnterGuard {
CONTEXT.with(|ctx| {
let old = ctx.borrow_mut().replace(new);
EnterGuard(old)
})
}
#[derive(Debug)]
pub(crate) struct EnterGuard(Option<Handle>);
impl Drop for EnterGuard {
fn drop(&mut self) {
CONTEXT.with(|ctx| {
*ctx.borrow_mut() = self.0.take();
});
}
}
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