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//! Thread local runtime context
use crate::runtime::{Handle, TryCurrentError};
use std::cell::RefCell;
thread_local! {
static CONTEXT: RefCell<Option<Handle>> = RefCell::new(None)
}
pub(crate) fn try_current() -> Result<Handle, crate::runtime::TryCurrentError> {
match CONTEXT.try_with(|ctx| ctx.borrow().clone()) {
Ok(Some(handle)) => Ok(handle),
Ok(None) => Err(TryCurrentError::new_no_context()),
Err(_access_error) => Err(TryCurrentError::new_thread_local_destroyed()),
}
}
pub(crate) fn current() -> Handle {
match try_current() {
Ok(handle) => handle,
Err(e) => panic!("{}", e),
}
}
cfg_io_driver! {
pub(crate) fn io_handle() -> crate::runtime::driver::IoHandle {
match CONTEXT.try_with(|ctx| {
let ctx = ctx.borrow();
ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).io_handle.clone()
}) {
Ok(io_handle) => io_handle,
Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR),
}
}
}
cfg_signal_internal! {
#[cfg(unix)]
pub(crate) fn signal_handle() -> crate::runtime::driver::SignalHandle {
match CONTEXT.try_with(|ctx| {
let ctx = ctx.borrow();
ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).signal_handle.clone()
}) {
Ok(signal_handle) => signal_handle,
Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR),
}
}
}
cfg_time! {
pub(crate) fn time_handle() -> crate::runtime::driver::TimeHandle {
match CONTEXT.try_with(|ctx| {
let ctx = ctx.borrow();
ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).time_handle.clone()
}) {
Ok(time_handle) => time_handle,
Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR),
}
}
cfg_test_util! {
pub(crate) fn clock() -> Option<crate::runtime::driver::Clock> {
match CONTEXT.try_with(|ctx| (*ctx.borrow()).as_ref().map(|ctx| ctx.clock.clone())) {
Ok(clock) => clock,
Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR),
}
}
}
}
cfg_rt! {
pub(crate) fn spawn_handle() -> Option<crate::runtime::Spawner> {
match CONTEXT.try_with(|ctx| (*ctx.borrow()).as_ref().map(|ctx| ctx.spawner.clone())) {
Ok(spawner) => spawner,
Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR),
}
}
}
/// Sets this [`Handle`] as the current active [`Handle`].
///
/// [`Handle`]: Handle
pub(crate) fn enter(new: Handle) -> EnterGuard {
match try_enter(new) {
Some(guard) => guard,
None => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR),
}
}
/// Sets this [`Handle`] as the current active [`Handle`].
///
/// [`Handle`]: Handle
pub(crate) fn try_enter(new: Handle) -> Option<EnterGuard> {
CONTEXT
.try_with(|ctx| {
let old = ctx.borrow_mut().replace(new);
EnterGuard(old)
})
.ok()
}
#[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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