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|
//! Thread local runtime context
use crate::runtime::Spawner;
use std::cell::RefCell;
thread_local! {
static CONTEXT: RefCell<Option<ThreadContext>> = RefCell::new(None)
}
/// ThreadContext makes Runtime context accessible to each Runtime thread.
#[derive(Debug, Clone)]
pub(crate) struct ThreadContext {
/// Handles to the executor.
spawner: Spawner,
/// Handles to the I/O drivers
io_handle: crate::runtime::io::Handle,
/// Handles to the time drivers
time_handle: crate::runtime::time::Handle,
/// Source of `Instant::now()`
clock: Option<crate::runtime::time::Clock>,
}
impl Default for ThreadContext {
fn default() -> Self {
ThreadContext {
spawner: Spawner::Shell,
#[cfg(all(feature = "io-driver", not(loom)))]
io_handle: None,
#[cfg(any(not(feature = "io-driver"), loom))]
io_handle: (),
#[cfg(all(feature = "time", not(loom)))]
time_handle: None,
#[cfg(any(not(feature = "time"), loom))]
time_handle: (),
clock: None,
}
}
}
impl ThreadContext {
/// Construct a new [`ThreadContext`]
///
/// [`ThreadContext`]: struct.ThreadContext.html
pub(crate) fn new(
spawner: Spawner,
io_handle: crate::runtime::io::Handle,
time_handle: crate::runtime::time::Handle,
clock: Option<crate::runtime::time::Clock>,
) -> Self {
ThreadContext {
spawner,
#[cfg(all(feature = "io-driver", not(loom)))]
io_handle,
#[cfg(any(not(feature = "io-driver"), loom))]
io_handle,
#[cfg(all(feature = "time", not(loom)))]
time_handle,
#[cfg(any(not(feature = "time"), loom))]
time_handle,
clock,
}
}
/// Clone the current [`ThreadContext`] if one is set, otherwise construct a new [`ThreadContext`].
///
/// [`ThreadContext`]: struct.ThreadContext.html
#[allow(dead_code)]
pub(crate) fn clone_current() -> Self {
CONTEXT.with(|ctx| ctx.borrow().clone().unwrap_or_else(Default::default))
}
/// Set this [`ThreadContext`] as the current active [`ThreadContext`].
///
/// [`ThreadContext`]: struct.ThreadContext.html
pub(crate) fn enter(self) -> ThreadContextDropGuard {
CONTEXT.with(|ctx| {
let previous = ctx.borrow_mut().replace(self);
ThreadContextDropGuard { previous }
})
}
#[cfg(all(feature = "io-driver", not(loom)))]
pub(crate) fn io_handle() -> crate::runtime::io::Handle {
CONTEXT.with(|ctx| match *ctx.borrow() {
Some(ref ctx) => ctx.io_handle.clone(),
None => None,
})
}
#[cfg(all(feature = "time", not(loom)))]
pub(crate) fn time_handle() -> crate::runtime::time::Handle {
CONTEXT.with(|ctx| match *ctx.borrow() {
Some(ref ctx) => ctx.time_handle.clone(),
None => None,
})
}
#[cfg(feature = "rt-core")]
pub(crate) fn spawn_handle() -> Option<Spawner> {
CONTEXT.with(|ctx| match *ctx.borrow() {
Some(ref ctx) => Some(ctx.spawner.clone()),
None => None,
})
}
#[cfg(all(feature = "test-util", feature = "time"))]
pub(crate) fn clock() -> Option<crate::runtime::time::Clock> {
CONTEXT.with(
|ctx| match ctx.borrow().as_ref().map(|ctx| ctx.clock.clone()) {
Some(Some(clock)) => Some(clock),
_ => None,
},
)
}
}
/// [`ThreadContextDropGuard`] will replace the `previous` thread context on drop.
///
/// [`ThreadContextDropGuard`]: struct.ThreadContextDropGuard.html
#[derive(Debug)]
pub(crate) struct ThreadContextDropGuard {
previous: Option<ThreadContext>,
}
impl Drop for ThreadContextDropGuard {
fn drop(&mut self) {
CONTEXT.with(|ctx| match self.previous.clone() {
Some(prev) => ctx.borrow_mut().replace(prev),
None => ctx.borrow_mut().take(),
});
}
}
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