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Rollup merge of #72998 - poliorcetics:atomic-availability-doc, r=Amanieu

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Mention that some atomic operations may not be available on some platforms

fixes #54250

This simply adds a line saying the type/function/method may not be available on some platforms, depending on said platform capabilities.

I *think* I got them all.
This commit is contained in:
Dylan DPC
2020-06-07 15:33:44 +02:00
committed by GitHub
parent 1ff0ba03ef 53984569e2
commit de1941ab2a
1 changed files with 87 additions and 0 deletions
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src/libcore/sync/atomic.rs
+87
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@@ -153,6 +153,9 @@ pub fn spin_loop_hint() {
///
/// This type has the same in-memory representation as a [`bool`].
///
/// **Note**: This type is only available on platforms that support atomic
/// loads and stores of `u8`.
///
/// [`bool`]: ../../../std/primitive.bool.html
#[cfg(target_has_atomic_load_store = "8")]
#[stable(feature = "rust1", since = "1.0.0")]
@@ -178,6 +181,9 @@ unsafe impl Sync for AtomicBool {}
/// A raw pointer type which can be safely shared between threads.
///
/// This type has the same in-memory representation as a `*mut T`.
///
/// **Note**: This type is only available on platforms that support atomic
/// loads and stores of pointers. Its size depends on the target pointer's size.
#[cfg(target_has_atomic_load_store = "ptr")]
#[stable(feature = "rust1", since = "1.0.0")]
#[cfg_attr(target_pointer_width = "16", repr(C, align(2)))]
@@ -447,6 +453,9 @@ pub fn store(&self, val: bool, order: Ordering) {
/// [`Acquire`] makes the store part of this operation [`Relaxed`], and
/// using [`Release`] makes the load part [`Relaxed`].
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on `u8`.
///
/// [`Ordering`]: enum.Ordering.html
/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed
/// [`Release`]: enum.Ordering.html#variant.Release
@@ -481,6 +490,9 @@ pub fn swap(&self, val: bool, order: Ordering) -> bool {
/// Using [`Acquire`] makes the store part of this operation [`Relaxed`] if it
/// happens, and using [`Release`] makes the load part [`Relaxed`].
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on `u8`.
///
/// [`Ordering`]: enum.Ordering.html
/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed
/// [`Release`]: enum.Ordering.html#variant.Release
@@ -524,6 +536,8 @@ pub fn compare_and_swap(&self, current: bool, new: bool, order: Ordering) -> boo
/// [`Relaxed`]. The failure ordering can only be [`SeqCst`], [`Acquire`] or [`Relaxed`]
/// and must be equivalent to or weaker than the success ordering.
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on `u8`.
///
/// [`bool`]: ../../../std/primitive.bool.html
/// [`Ordering`]: enum.Ordering.html
@@ -586,6 +600,9 @@ pub fn compare_exchange(
/// [`Relaxed`]. The failure ordering can only be [`SeqCst`], [`Acquire`] or [`Relaxed`]
/// and must be equivalent to or weaker than the success ordering.
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on `u8`.
///
/// [`bool`]: ../../../std/primitive.bool.html
/// [`compare_exchange`]: #method.compare_exchange
/// [`Ordering`]: enum.Ordering.html
@@ -646,6 +663,9 @@ pub fn compare_exchange_weak(
/// [`Release`]: enum.Ordering.html#variant.Release
/// [`Acquire`]: enum.Ordering.html#variant.Acquire
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on `u8`.
///
/// # Examples
///
/// ```
@@ -683,6 +703,9 @@ pub fn fetch_and(&self, val: bool, order: Ordering) -> bool {
/// [`Acquire`] makes the store part of this operation [`Relaxed`], and
/// using [`Release`] makes the load part [`Relaxed`].
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on `u8`.
///
/// [`Ordering`]: enum.Ordering.html
/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed
/// [`Release`]: enum.Ordering.html#variant.Release
@@ -737,6 +760,9 @@ pub fn fetch_nand(&self, val: bool, order: Ordering) -> bool {
/// [`Acquire`] makes the store part of this operation [`Relaxed`], and
/// using [`Release`] makes the load part [`Relaxed`].
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on `u8`.
///
/// [`Ordering`]: enum.Ordering.html
/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed
/// [`Release`]: enum.Ordering.html#variant.Release
@@ -779,6 +805,9 @@ pub fn fetch_or(&self, val: bool, order: Ordering) -> bool {
/// [`Acquire`] makes the store part of this operation [`Relaxed`], and
/// using [`Release`] makes the load part [`Relaxed`].
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on `u8`.
///
/// [`Ordering`]: enum.Ordering.html
/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed
/// [`Release`]: enum.Ordering.html#variant.Release
@@ -981,6 +1010,9 @@ pub fn store(&self, ptr: *mut T, order: Ordering) {
/// [`Acquire`] makes the store part of this operation [`Relaxed`], and
/// using [`Release`] makes the load part [`Relaxed`].
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on pointers.
///
/// [`Ordering`]: enum.Ordering.html
/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed
/// [`Release`]: enum.Ordering.html#variant.Release
@@ -1017,6 +1049,9 @@ pub fn swap(&self, ptr: *mut T, order: Ordering) -> *mut T {
/// Using [`Acquire`] makes the store part of this operation [`Relaxed`] if it
/// happens, and using [`Release`] makes the load part [`Relaxed`].
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on pointers.
///
/// [`Ordering`]: enum.Ordering.html
/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed
/// [`Release`]: enum.Ordering.html#variant.Release
@@ -1058,6 +1093,9 @@ pub fn compare_and_swap(&self, current: *mut T, new: *mut T, order: Ordering) ->
/// [`Relaxed`]. The failure ordering can only be [`SeqCst`], [`Acquire`] or [`Relaxed`]
/// and must be equivalent to or weaker than the success ordering.
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on pointers.
///
/// [`Ordering`]: enum.Ordering.html
/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed
/// [`Release`]: enum.Ordering.html#variant.Release
@@ -1118,6 +1156,9 @@ pub fn compare_exchange(
/// [`Relaxed`]. The failure ordering can only be [`SeqCst`], [`Acquire`] or [`Relaxed`]
/// and must be equivalent to or weaker than the success ordering.
///
/// **Note:** This method is only available on platforms that support atomic
/// operations on pointers.
///
/// [`compare_exchange`]: #method.compare_exchange
/// [`Ordering`]: enum.Ordering.html
/// [`Relaxed`]: enum.Ordering.html#variant.Relaxed
@@ -1223,6 +1264,13 @@ macro_rules! atomic_int {
/// non-atomic types as well as information about the portability of
/// this type, please see the [module-level documentation].
///
/// **Note:** This type is only available on platforms that support
/// atomic loads and stores of [`
#[doc = $s_int_type]
/// `](
#[doc = $int_ref]
/// ).
///
/// [module-level documentation]: index.html
#[$stable]
#[repr(C, align($align))]
@@ -1408,6 +1456,9 @@ pub fn store(&self, val: $int_type, order: Ordering) {
[`Acquire`] makes the store part of this operation [`Relaxed`], and
using [`Release`] makes the load part [`Relaxed`].
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release
@@ -1444,6 +1495,9 @@ pub fn swap(&self, val: $int_type, order: Ordering) -> $int_type {
Using [`Acquire`] makes the store part of this operation [`Relaxed`] if it
happens, and using [`Release`] makes the load part [`Relaxed`].
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release
@@ -1496,6 +1550,9 @@ pub fn compare_and_swap(&self,
[`Relaxed`]. The failure ordering can only be [`SeqCst`], [`Acquire`] or [`Relaxed`]
and must be equivalent to or weaker than the success ordering.
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release
@@ -1558,6 +1615,9 @@ pub fn compare_exchange(&self,
[`Acquire`]: enum.Ordering.html#variant.Acquire
[`SeqCst`]: enum.Ordering.html#variant.SeqCst
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
# Examples
```
@@ -1599,6 +1659,9 @@ pub fn compare_exchange_weak(&self,
[`Acquire`] makes the store part of this operation [`Relaxed`], and
using [`Release`] makes the load part [`Relaxed`].
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release
@@ -1632,6 +1695,9 @@ pub fn fetch_add(&self, val: $int_type, order: Ordering) -> $int_type {
[`Acquire`] makes the store part of this operation [`Relaxed`], and
using [`Release`] makes the load part [`Relaxed`].
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release
@@ -1668,6 +1734,9 @@ pub fn fetch_sub(&self, val: $int_type, order: Ordering) -> $int_type {
[`Acquire`] makes the store part of this operation [`Relaxed`], and
using [`Release`] makes the load part [`Relaxed`].
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release
@@ -1704,6 +1773,9 @@ pub fn fetch_and(&self, val: $int_type, order: Ordering) -> $int_type {
[`Acquire`] makes the store part of this operation [`Relaxed`], and
using [`Release`] makes the load part [`Relaxed`].
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release
@@ -1741,6 +1813,9 @@ pub fn fetch_nand(&self, val: $int_type, order: Ordering) -> $int_type {
[`Acquire`] makes the store part of this operation [`Relaxed`], and
using [`Release`] makes the load part [`Relaxed`].
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release
@@ -1777,6 +1852,9 @@ pub fn fetch_or(&self, val: $int_type, order: Ordering) -> $int_type {
[`Acquire`] makes the store part of this operation [`Relaxed`], and
using [`Release`] makes the load part [`Relaxed`].
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release
@@ -1819,6 +1897,9 @@ pub fn fetch_xor(&self, val: $int_type, order: Ordering) -> $int_type {
[`Relaxed`]. The (failed) load ordering can only be [`SeqCst`], [`Acquire`] or [`Relaxed`]
and must be equivalent to or weaker than the success ordering.
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`bool`]: ../../../std/primitive.bool.html
[`compare_exchange`]: #method.compare_exchange
[`Ordering`]: enum.Ordering.html
@@ -1870,6 +1951,9 @@ pub fn fetch_update<F>(&self,
[`Acquire`] makes the store part of this operation [`Relaxed`], and
using [`Release`] makes the load part [`Relaxed`].
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release
@@ -1917,6 +2001,9 @@ pub fn fetch_max(&self, val: $int_type, order: Ordering) -> $int_type {
[`Acquire`] makes the store part of this operation [`Relaxed`], and
using [`Release`] makes the load part [`Relaxed`].
**Note**: This method is only available on platforms that support atomic
operations on [`", $s_int_type, "`](", $int_ref, ").
[`Ordering`]: enum.Ordering.html
[`Relaxed`]: enum.Ordering.html#variant.Relaxed
[`Release`]: enum.Ordering.html#variant.Release