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Add support for LazyLock

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This commit is contained in:
Bert Peters
2025-01-17 22:31:40 +01:00
parent 40f835afd2
commit 25ae542ade
6 changed files with 152 additions and 13 deletions
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25
src/stdsync.rs
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@@ -30,6 +30,12 @@ pub use tracing::{
Condvar, Mutex, MutexGuard, Once, OnceLock, RwLock, RwLockReadGuard, RwLockWriteGuard,
};
#[cfg(all(has_std__sync__LazyLock, debug_assertions))]
pub use tracing::LazyLock;
#[cfg(all(has_std__sync__LazyLock, not(debug_assertions)))]
pub use std::sync::LazyLock;
/// Dependency tracing versions of [`std::sync`].
pub mod tracing {
use std::fmt;
@@ -47,6 +53,12 @@ pub mod tracing {
use crate::BorrowedMutex;
use crate::LazyMutexId;
#[cfg(has_std__sync__LazyLock)]
pub use lazy_lock::LazyLock;
#[cfg(has_std__sync__LazyLock)]
mod lazy_lock;
/// Wrapper for [`std::sync::Mutex`].
///
/// Refer to the [crate-level][`crate`] documentation for the differences between this struct and
@@ -460,8 +472,7 @@ pub mod tracing {
where
F: FnOnce(),
{
let _guard = self.mutex_id.get_borrowed();
self.inner.call_once(f);
self.mutex_id.with_held(|| self.inner.call_once(f))
}
/// Performs the same operation as [`call_once`][Once::call_once] except it ignores
@@ -475,8 +486,7 @@ pub mod tracing {
where
F: FnOnce(&OnceState),
{
let _guard = self.mutex_id.get_borrowed();
self.inner.call_once_force(f);
self.mutex_id.with_held(|| self.inner.call_once_force(f))
}
/// Returns true if some `call_once` has completed successfully.
@@ -550,9 +560,7 @@ pub mod tracing {
/// As this method may block until initialization is complete, it participates in cycle
/// detection.
pub fn set(&self, value: T) -> Result<(), T> {
let _guard = self.id.get_borrowed();
self.inner.set(value)
self.id.with_held(|| self.inner.set(value))
}
/// Gets the contents of the cell, initializing it with `f` if the cell was empty.
@@ -562,8 +570,7 @@ pub mod tracing {
where
F: FnOnce() -> T,
{
let _guard = self.id.get_borrowed();
self.inner.get_or_init(f)
self.id.with_held(|| self.inner.get_or_init(f))
}
/// Takes the value out of this `OnceLock`, moving it back to an uninitialized state.