1 files changed, 0 insertions, 61 deletions
diff --git a/vendor/spin/src/relax.rs b/vendor/spin/src/relax.rs
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--- a/vendor/spin/src/relax.rs
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@@ -1,61 +0,0 @@
-//! Strategies that determine the behaviour of locks when encountering contention.
-
-/// A trait implemented by spinning relax strategies.
-pub trait RelaxStrategy {
-    /// Perform the relaxing operation during a period of contention.
-    fn relax();
-}
-
-/// A strategy that rapidly spins while informing the CPU that it should power down non-essential components via
-/// [`core::hint::spin_loop`].
-///
-/// Note that spinning is a 'dumb' strategy and most schedulers cannot correctly differentiate it from useful work,
-/// thereby misallocating even more CPU time to the spinning process. This is known as
-/// ['priority inversion'](https://matklad.github.io/2020/01/02/spinlocks-considered-harmful.html).
-///
-/// If you see signs that priority inversion is occurring, consider switching to [`Yield`] or, even better, not using a
-/// spinlock at all and opting for a proper scheduler-aware lock. Remember also that different targets, operating
-/// systems, schedulers, and even the same scheduler with different workloads will exhibit different behaviour. Just
-/// because priority inversion isn't occurring in your tests does not mean that it will not occur. Use a scheduler-
-/// aware lock if at all possible.
-pub struct Spin;
-
-impl RelaxStrategy for Spin {
-    #[inline(always)]
-    fn relax() {
-        // Use the deprecated spin_loop_hint() to ensure that we don't get
-        // a higher MSRV than we need to.
-        #[allow(deprecated)]
-        core::sync::atomic::spin_loop_hint();
-    }
-}
-
-/// A strategy that yields the current time slice to the scheduler in favour of other threads or processes.
-///
-/// This is generally used as a strategy for minimising power consumption and priority inversion on targets that have a
-/// standard library available. Note that such targets have scheduler-integrated concurrency primitives available, and
-/// you should generally use these instead, except in rare circumstances.
-#[cfg(feature = "std")]
-#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
-pub struct Yield;
-
-#[cfg(feature = "std")]
-#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
-impl RelaxStrategy for Yield {
-    #[inline(always)]
-    fn relax() {
-        std::thread::yield_now();
-    }
-}
-
-/// A strategy that rapidly spins, without telling the CPU to do any powering down.
-///
-/// You almost certainly do not want to use this. Use [`Spin`] instead. It exists for completeness and for targets
-/// that, for some reason, miscompile or do not support spin hint intrinsics despite attempting to generate code for
-/// them (i.e: this is a workaround for possible compiler bugs).
-pub struct Loop;
-
-impl RelaxStrategy for Loop {
-    #[inline(always)]
-    fn relax() {}
-}