//! types.
//!
//! This module defines atomic versions of a select number of primitive
-//! types, including `AtomicBool`, `AtomicIsize`, and `AtomicUsize`.
+//! types, including [`AtomicBool`], [`AtomicIsize`], and [`AtomicUsize`].
//! Atomic types present operations that, when used correctly, synchronize
//! updates between threads.
//!
-//! Each method takes an `Ordering` which represents the strength of
+//! [`AtomicBool`]: struct.AtomicBool.html
+//! [`AtomicIsize`]: struct.AtomicIsize.html
+//! [`AtomicUsize`]: struct.AtomicUsize.html
+//!
+//! Each method takes an [`Ordering`] which represents the strength of
//! the memory barrier for that operation. These orderings are the
//! same as [LLVM atomic orderings][1]. For more information see the [nomicon][2].
//!
+//! [`Ordering`]: enum.Ordering.html
+//!
//! [1]: http://llvm.org/docs/LangRef.html#memory-model-for-concurrent-operations
//! [2]: ../../../nomicon/atomics.html
//!
-//! Atomic variables are safe to share between threads (they implement `Sync`)
+//! Atomic variables are safe to share between threads (they implement [`Sync`])
//! but they do not themselves provide the mechanism for sharing and follow the
//! [threading model](../../../std/thread/index.html#the-threading-model) of rust.
-//! The most common way to share an atomic variable is to put it into an `Arc` (an
+//! The most common way to share an atomic variable is to put it into an [`Arc`][arc] (an
//! atomically-reference-counted shared pointer).
//!
+//! [`Sync`]: ../../marker/trait.Sync.html
+//! [arc]: ../../../std/sync/struct.Arc.html
+//!
//! Most atomic types may be stored in static variables, initialized using
-//! the provided static initializers like `ATOMIC_BOOL_INIT`. Atomic statics
+//! the provided static initializers like [`ATOMIC_BOOL_INIT`]. Atomic statics
//! are often used for lazy global initialization.
//!
+//! [`ATOMIC_BOOL_INIT`]: constant.ATOMIC_BOOL_INIT.html
//!
//! # Examples
//!
/// Rust's memory orderings are [the same as
/// LLVM's](http://llvm.org/docs/LangRef.html#memory-model-for-concurrent-operations).
///
-/// For more information see the [nomicon][1].
-/// [1]: ../../../nomicon/atomics.html
+/// For more information see the [nomicon].
+///
+/// [nomicon]: ../../../nomicon/atomics.html
#[stable(feature = "rust1", since = "1.0.0")]
#[derive(Copy, Clone, Debug)]
pub enum Ordering {
- /// No ordering constraints, only atomic operations. Corresponds to LLVM's
- /// `Monotonic` ordering.
+ /// No ordering constraints, only atomic operations.
+ ///
+ /// Corresponds to LLVM's [`Monotonic`] ordering.
+ ///
+ /// [`Monotonic`]: http://llvm.org/docs/Atomics.html#monotonic
#[stable(feature = "rust1", since = "1.0.0")]
Relaxed,
/// When coupled with a store, all previous writes become visible
- /// to the other threads that perform a load with `Acquire` ordering
+ /// to the other threads that perform a load with [`Acquire`] ordering
/// on the same value.
+ ///
+ /// [`Acquire`]: http://llvm.org/docs/Atomics.html#acquire
#[stable(feature = "rust1", since = "1.0.0")]
Release,
/// When coupled with a load, all subsequent loads will see data
- /// written before a store with `Release` ordering on the same value
+ /// written before a store with [`Release`] ordering on the same value
/// in other threads.
+ ///
+ /// [`Release`]: http://llvm.org/docs/Atomics.html#release
#[stable(feature = "rust1", since = "1.0.0")]
Acquire,
- /// When coupled with a load, uses `Acquire` ordering, and with a store
- /// `Release` ordering.
+ /// When coupled with a load, uses [`Acquire`] ordering, and with a store
+ /// [`Release`] ordering.
+ ///
+ /// [`Acquire`]: http://llvm.org/docs/Atomics.html#acquire
+ /// [`Release`]: http://llvm.org/docs/Atomics.html#release
#[stable(feature = "rust1", since = "1.0.0")]
AcqRel,
/// Like `AcqRel` with the additional guarantee that all threads see all
__Nonexhaustive,
}
-/// An `AtomicBool` initialized to `false`.
+/// An [`AtomicBool`] initialized to `false`.
+///
+/// [`AtomicBool`]: struct.AtomicBool.html
#[cfg(target_has_atomic = "8")]
#[stable(feature = "rust1", since = "1.0.0")]
pub const ATOMIC_BOOL_INIT: AtomicBool = AtomicBool::new(false);
///
/// [`Ordering`]: enum.Ordering.html
/// [`Release`]: enum.Ordering.html#variant.Release
- /// [`AcqRel`]: enum.Ordering.html#variant.Release
+ /// [`AcqRel`]: enum.Ordering.html#variant.AcqRel
///
/// # Examples
///
///
/// # Panics
///
- /// Panics if `order` is `Acquire` or `AcqRel`.
+ /// Panics if `order` is [`Acquire`] or [`AcqRel`].
+ ///
+ /// [`Acquire`]: enum.Ordering.html#variant.Acquire
+ /// [`AcqRel`]: enum.Ordering.html#variant.AcqRel
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
pub fn store(&self, val: bool, order: Ordering) {
}
}
- /// Stores a value into the bool, returning the old value.
+ /// Stores a value into the bool, returning the previous value.
///
/// `swap` takes an [`Ordering`] argument which describes the memory ordering
/// of this operation.
/// Stores a value into the `bool` if the current value is the same as the `current` value.
///
- /// Unlike `compare_exchange`, this function is allowed to spuriously fail even when the
+ /// Unlike [`compare_exchange`], this function is allowed to spuriously fail even when the
/// comparison succeeds, which can result in more efficient code on some platforms. The
/// return value is a result indicating whether the new value was written and containing the
/// previous value.
/// failure ordering can't be [`Release`] or [`AcqRel`] and must be equivalent or
/// weaker than the success ordering.
///
+ /// [`compare_exchange`]: #method.compare_exchange
/// [`Ordering`]: enum.Ordering.html
/// [`Release`]: enum.Ordering.html#variant.Release
/// [`AcqRel`]: enum.Ordering.html#variant.Release
///
/// # Panics
///
- /// Panics if `order` is `Acquire` or `AcqRel`.
+ /// Panics if `order` is [`Acquire`] or [`AcqRel`].
+ ///
+ /// [`Acquire`]: enum.Ordering.html#variant.Acquire
+ /// [`AcqRel`]: enum.Ordering.html#variant.AcqRel
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
pub fn store(&self, ptr: *mut T, order: Ordering) {
}
}
- /// Stores a value into the pointer, returning the old value.
+ /// Stores a value into the pointer, returning the previous value.
///
/// `swap` takes an [`Ordering`] argument which describes the memory ordering
/// of this operation.
///
/// # Panics
///
- /// Panics if `order` is `Acquire` or `AcqRel`.
+ /// Panics if `order` is [`Acquire`] or [`AcqRel`].
+ ///
+ /// [`Acquire`]: enum.Ordering.html#variant.Acquire
+ /// [`AcqRel`]: enum.Ordering.html#variant.AcqRel
#[inline]
#[$stable]
pub fn store(&self, val: $int_type, order: Ordering) {
unsafe { atomic_store(self.v.get(), val, order); }
}
- /// Stores a value into the atomic integer, returning the old value.
+ /// Stores a value into the atomic integer, returning the previous value.
///
/// `swap` takes an [`Ordering`] argument which describes the memory ordering of this
/// operation.
}
}
- /// Add to the current value, returning the previous value.
+ /// Adds to the current value, returning the previous value.
+ ///
+ /// This operation wraps around on overflow.
///
/// # Examples
///
unsafe { atomic_add(self.v.get(), val, order) }
}
- /// Subtract from the current value, returning the previous value.
+ /// Subtracts from the current value, returning the previous value.
+ ///
+ /// This operation wraps around on overflow.
///
/// # Examples
///
unsafe { atomic_sub(self.v.get(), val, order) }
}
- /// Bitwise and with the current value, returning the previous value.
+ /// Bitwise "and" with the current value.
+ ///
+ /// Performs a bitwise "and" operation on the current value and the argument `val`, and
+ /// sets the new value to the result.
+ ///
+ /// Returns the previous value.
///
/// # Examples
///
unsafe { atomic_and(self.v.get(), val, order) }
}
- /// Bitwise or with the current value, returning the previous value.
+ /// Bitwise "or" with the current value.
+ ///
+ /// Performs a bitwise "or" operation on the current value and the argument `val`, and
+ /// sets the new value to the result.
+ ///
+ /// Returns the previous value.
///
/// # Examples
///
unsafe { atomic_or(self.v.get(), val, order) }
}
- /// Bitwise xor with the current value, returning the previous value.
+ /// Bitwise "xor" with the current value.
+ ///
+ /// Performs a bitwise "xor" operation on the current value and the argument `val`, and
+ /// sets the new value to the result.
+ ///
+ /// Returns the previous value.
///
/// # Examples
///
}
}
-/// Returns the old value (like __sync_fetch_and_add).
+/// Returns the previous value (like __sync_fetch_and_add).
#[inline]
unsafe fn atomic_add<T>(dst: *mut T, val: T, order: Ordering) -> T {
match order {
}
}
-/// Returns the old value (like __sync_fetch_and_sub).
+/// Returns the previous value (like __sync_fetch_and_sub).
#[inline]
unsafe fn atomic_sub<T>(dst: *mut T, val: T, order: Ordering) -> T {
match order {
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