207b6091d4
`thread_info` currently uses `RefCell`-based initialization. Refactor this to use `OnceCell` instead which is more performant and better suits the needs of one-time initialization.
51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
#![allow(dead_code)] // stack_guard isn't used right now on all platforms
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use crate::cell::OnceCell;
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use crate::sys::thread::guard::Guard;
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use crate::thread::Thread;
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struct ThreadInfo {
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stack_guard: OnceCell<Guard>,
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thread: OnceCell<Thread>,
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}
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thread_local! {
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static THREAD_INFO: ThreadInfo = const { ThreadInfo {
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stack_guard: OnceCell::new(),
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thread: OnceCell::new()
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} };
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}
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impl ThreadInfo {
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fn with<R, F>(f: F) -> Option<R>
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where
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F: FnOnce(&Thread, &OnceCell<Guard>) -> R,
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{
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THREAD_INFO
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.try_with(move |thread_info| {
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let thread = thread_info.thread.get_or_init(|| Thread::new(None));
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f(thread, &thread_info.stack_guard)
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})
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.ok()
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}
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}
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pub fn current_thread() -> Option<Thread> {
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ThreadInfo::with(|thread, _| thread.clone())
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}
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pub fn stack_guard() -> Option<Guard> {
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ThreadInfo::with(|_, guard| guard.get().cloned()).flatten()
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}
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/// Set new thread info, panicking if it has already been initialized
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#[allow(unreachable_code, unreachable_patterns)] // some platforms don't use stack_guard
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pub fn set(stack_guard: Option<Guard>, thread: Thread) {
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THREAD_INFO.with(move |thread_info| {
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rtassert!(thread_info.stack_guard.get().is_none() && thread_info.thread.get().is_none());
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if let Some(guard) = stack_guard {
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thread_info.stack_guard.set(guard).unwrap();
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}
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thread_info.thread.set(thread).unwrap();
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});
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}
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