tracing_core/
stdlib.rs

1//! Re-exports either the Rust `std` library or `core` and `alloc` when `std` is
2//! disabled.
3//!
4//! `crate::stdlib::...` should be used rather than `std::` when adding code that
5//! will be available with the standard library disabled.
6//!
7//! Note that this module is called `stdlib` rather than `std`, as Rust 1.34.0
8//! does not permit redefining the name `stdlib` (although this works on the
9//! latest stable Rust).
10#[cfg(feature = "std")]
11pub(crate) use std::*;
12
13#[cfg(not(feature = "std"))]
14pub(crate) use self::no_std::*;
15
16#[cfg(not(feature = "std"))]
17mod no_std {
18    // We pre-emptively export everything from libcore/liballoc, (even modules
19    // we aren't using currently) to make adding new code easier. Therefore,
20    // some of these imports will be unused.
21    #![allow(unused_imports)]
22
23    pub(crate) use core::{
24        any, array, ascii, cell, char, clone, cmp, convert, default, f32, f64, ffi, future, hash,
25        hint, i128, i16, i8, isize, iter, marker, mem, num, ops, option, pin, ptr, result, task,
26        time, u128, u16, u32, u8, usize,
27    };
28
29    pub(crate) use alloc::{boxed, collections, rc, string, vec};
30
31    pub(crate) mod borrow {
32        pub(crate) use alloc::borrow::*;
33        pub(crate) use core::borrow::*;
34    }
35
36    pub(crate) mod fmt {
37        pub(crate) use alloc::fmt::*;
38        pub(crate) use core::fmt::*;
39    }
40
41    pub(crate) mod slice {
42        pub(crate) use alloc::slice::*;
43        pub(crate) use core::slice::*;
44    }
45
46    pub(crate) mod str {
47        pub(crate) use alloc::str::*;
48        pub(crate) use core::str::*;
49    }
50
51    pub(crate) mod sync {
52        pub(crate) use crate::spin::MutexGuard;
53        pub(crate) use alloc::sync::*;
54        pub(crate) use core::sync::*;
55
56        /// This wraps `spin::Mutex` to return a `Result`, so that it can be
57        /// used with code written against `std::sync::Mutex`.
58        ///
59        /// Since `spin::Mutex` doesn't support poisoning, the `Result` returned
60        /// by `lock` will always be `Ok`.
61        #[derive(Debug, Default)]
62        pub(crate) struct Mutex<T> {
63            inner: crate::spin::Mutex<T>,
64        }
65
66        impl<T> Mutex<T> {
67            // pub(crate) fn new(data: T) -> Self {
68            //     Self {
69            //         inner: crate::spin::Mutex::new(data),
70            //     }
71            // }
72
73            pub(crate) fn lock(&self) -> Result<MutexGuard<'_, T>, ()> {
74                Ok(self.inner.lock())
75            }
76        }
77    }
78}
tracing_core/stdlib.rs

tracing_core/
stdlib.rs
