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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| match *ctx.borrow() {
Some(ref ctx) => ctx.io_handle.clone(),
None => Default::default(),
})
}
}
cfg_signal_internal! {
#[cfg(unix)]
pub(crate) fn signal_handle() -> crate::runtime::driver::SignalHandle {
CONTEXT.with(|ctx| match *ctx.borrow() {
Some(ref ctx) => ctx.signal_handle.clone(),
None => Default::default(),
})
}
}
cfg_time! {
pub(crate) fn time_handle() -> crate::runtime::driver::TimeHandle {
CONTEXT.with(|ctx| match *ctx.borrow() {
Some(ref ctx) => ctx.time_handle.clone(),
None => Default::default(),
})
}
cfg_test_util! {
pub(crate) fn clock() -> Option<crate::runtime::driver::Clock> {
CONTEXT.with(|ctx| match *ctx.borrow() {
Some(ref ctx) => Some(ctx.clock.clone()),
None => None,
})
}
}
}
cfg_rt! {
pub(crate) fn spawn_handle() -> Option<crate::runtime::Spawner> {
CONTEXT.with(|ctx| match *ctx.borrow() {
Some(ref ctx) => Some(ctx.spawner.clone()),
None => None,
})
}
}
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();
});
}
}