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https://github.com/tokio-rs/tracing.git
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f7966bde76
Currently, `no_std` targets use a vendored version of `lazy_static` that uses the `spin` crate's `Once` type, while the `std` target uses the `once_cell` crate's `Lazy` type. This is unfortunate, as the `lazy_static` macro has a different interface from the `Lazy` cell type. This increases the amount of code that differs based on whether or not `std` is enabled. This branch removes the vendored `lazy_static` macro and replaces it with a reimplementation of `once_cell::sync::Lazy` that uses `spin::Once` rather than `once_cell::sync::OnceCell` as the inner "once type". Now, all code can be written against a `Lazy` struct with the same interface, regardless of whether or not `std` is enabled. Signed-off-by: Eliza Weisman <eliza@buoyant.io>
79 lines
2.4 KiB
Rust
79 lines
2.4 KiB
Rust
//! Re-exports either the Rust `std` library or `core` and `alloc` when `std` is
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//! disabled.
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//!
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//! `crate::stdlib::...` should be used rather than `std::` when adding code that
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//! will be available with the standard library disabled.
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//!
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//! Note that this module is called `stdlib` rather than `std`, as Rust 1.34.0
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//! does not permit redefining the name `stdlib` (although this works on the
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//! latest stable Rust).
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#[cfg(feature = "std")]
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pub(crate) use std::*;
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#[cfg(not(feature = "std"))]
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pub(crate) use self::no_std::*;
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#[cfg(not(feature = "std"))]
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mod no_std {
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// We pre-emptively export everything from libcore/liballoc, (even modules
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// we aren't using currently) to make adding new code easier. Therefore,
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// some of these imports will be unused.
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#![allow(unused_imports)]
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pub(crate) use core::{
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any, array, ascii, cell, char, clone, cmp, convert, default, f32, f64, ffi, future, hash,
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hint, i128, i16, i8, isize, iter, marker, mem, num, ops, option, pin, ptr, result, task,
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time, u128, u16, u32, u8, usize,
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};
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pub(crate) use alloc::{boxed, collections, rc, string, vec};
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pub(crate) mod borrow {
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pub(crate) use alloc::borrow::*;
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pub(crate) use core::borrow::*;
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}
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pub(crate) mod fmt {
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pub(crate) use alloc::fmt::*;
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pub(crate) use core::fmt::*;
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}
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pub(crate) mod slice {
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pub(crate) use alloc::slice::*;
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pub(crate) use core::slice::*;
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}
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pub(crate) mod str {
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pub(crate) use alloc::str::*;
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pub(crate) use core::str::*;
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}
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pub(crate) mod sync {
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pub(crate) use crate::spin::MutexGuard;
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pub(crate) use alloc::sync::*;
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pub(crate) use core::sync::*;
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/// This wraps `spin::Mutex` to return a `Result`, so that it can be
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/// used with code written against `std::sync::Mutex`.
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///
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/// Since `spin::Mutex` doesn't support poisoning, the `Result` returned
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/// by `lock` will always be `Ok`.
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#[derive(Debug, Default)]
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pub(crate) struct Mutex<T> {
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inner: crate::spin::Mutex<T>,
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}
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impl<T> Mutex<T> {
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// pub(crate) fn new(data: T) -> Self {
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// Self {
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// inner: crate::spin::Mutex::new(data),
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// }
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// }
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pub(crate) fn lock(&self) -> Result<MutexGuard<'_, T>, ()> {
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Ok(self.inner.lock())
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}
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}
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}
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}
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