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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:11:38 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:12:43 +0000
commitcf94bdc0742c13e2a0cac864c478b8626b266e1b (patch)
tree044670aa50cc5e2b4229aa0b6b3df6676730c0a6 /vendor/tracing-subscriber-0.3.3/src/sync.rs
parentAdding debian version 1.65.0+dfsg1-2. (diff)
downloadrustc-cf94bdc0742c13e2a0cac864c478b8626b266e1b.tar.xz
rustc-cf94bdc0742c13e2a0cac864c478b8626b266e1b.zip
Merging upstream version 1.66.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/tracing-subscriber-0.3.3/src/sync.rs')
-rw-r--r--vendor/tracing-subscriber-0.3.3/src/sync.rs57
1 files changed, 57 insertions, 0 deletions
diff --git a/vendor/tracing-subscriber-0.3.3/src/sync.rs b/vendor/tracing-subscriber-0.3.3/src/sync.rs
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+//! Abstracts over sync primitive implementations.
+//!
+//! Optionally, we allow the Rust standard library's `RwLock` to be replaced
+//! with the `parking_lot` crate's implementation. This may provide improved
+//! performance in some cases. However, the `parking_lot` dependency is an
+//! opt-in feature flag. Because `parking_lot::RwLock` has a slightly different
+//! API than `std::sync::RwLock` (it does not support poisoning on panics), we
+//! wrap it with a type that provides the same method signatures. This allows us
+//! to transparently swap `parking_lot` in without changing code at the callsite.
+#[allow(unused_imports)] // may be used later;
+pub(crate) use std::sync::{LockResult, PoisonError, TryLockResult};
+
+#[cfg(not(feature = "parking_lot"))]
+pub(crate) use std::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard};
+
+#[cfg(feature = "parking_lot")]
+pub(crate) use self::parking_lot_impl::*;
+
+#[cfg(feature = "parking_lot")]
+mod parking_lot_impl {
+ pub(crate) use parking_lot::{RwLockReadGuard, RwLockWriteGuard};
+ use std::sync::{LockResult, TryLockError, TryLockResult};
+
+ #[derive(Debug)]
+ pub(crate) struct RwLock<T> {
+ inner: parking_lot::RwLock<T>,
+ }
+
+ impl<T> RwLock<T> {
+ pub(crate) fn new(val: T) -> Self {
+ Self {
+ inner: parking_lot::RwLock::new(val),
+ }
+ }
+
+ #[inline]
+ pub(crate) fn get_mut(&mut self) -> LockResult<&mut T> {
+ Ok(self.inner.get_mut())
+ }
+
+ #[inline]
+ pub(crate) fn read(&self) -> LockResult<RwLockReadGuard<'_, T>> {
+ Ok(self.inner.read())
+ }
+
+ #[inline]
+ #[allow(dead_code)] // may be used later;
+ pub(crate) fn try_read(&self) -> TryLockResult<RwLockReadGuard<'_, T>> {
+ self.inner.try_read().ok_or(TryLockError::WouldBlock)
+ }
+
+ #[inline]
+ pub(crate) fn write(&self) -> LockResult<RwLockWriteGuard<'_, T>> {
+ Ok(self.inner.write())
+ }
+ }
+}