1.0.0[−][src]Struct std::sync::atomic::AtomicPtr
A raw pointer type which can be safely shared between threads.
This type has the same in-memory representation as a *mut T
.
Methods
impl<T> AtomicPtr<T>
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pub const fn new(p: *mut T) -> AtomicPtr<T>
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Creates a new AtomicPtr
.
Examples
use std::sync::atomic::AtomicPtr; let ptr = &mut 5; let atomic_ptr = AtomicPtr::new(ptr);Run
pub fn get_mut(&mut self) -> &mut *mut T
1.15.0[src]
Returns a mutable reference to the underlying pointer.
This is safe because the mutable reference guarantees that no other threads are concurrently accessing the atomic data.
Examples
use std::sync::atomic::{AtomicPtr, Ordering}; let mut atomic_ptr = AtomicPtr::new(&mut 10); *atomic_ptr.get_mut() = &mut 5; assert_eq!(unsafe { *atomic_ptr.load(Ordering::SeqCst) }, 5);Run
pub fn into_inner(self) -> *mut T
1.15.0[src]
Consumes the atomic and returns the contained value.
This is safe because passing self
by value guarantees that no other threads are
concurrently accessing the atomic data.
Examples
use std::sync::atomic::AtomicPtr; let atomic_ptr = AtomicPtr::new(&mut 5); assert_eq!(unsafe { *atomic_ptr.into_inner() }, 5);Run
pub fn load(&self, order: Ordering) -> *mut T
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Loads a value from the pointer.
load
takes an Ordering
argument which describes the memory ordering
of this operation. Possible values are SeqCst
, Acquire
and Relaxed
.
Panics
Panics if order
is Release
or AcqRel
.
Examples
use std::sync::atomic::{AtomicPtr, Ordering}; let ptr = &mut 5; let some_ptr = AtomicPtr::new(ptr); let value = some_ptr.load(Ordering::Relaxed);Run
pub fn store(&self, ptr: *mut T, order: Ordering)
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Stores a value into the pointer.
store
takes an Ordering
argument which describes the memory ordering
of this operation. Possible values are SeqCst
, Release
and Relaxed
.
Panics
Panics if order
is Acquire
or AcqRel
.
Examples
use std::sync::atomic::{AtomicPtr, Ordering}; let ptr = &mut 5; let some_ptr = AtomicPtr::new(ptr); let other_ptr = &mut 10; some_ptr.store(other_ptr, Ordering::Relaxed);Run
pub fn swap(&self, ptr: *mut T, order: Ordering) -> *mut T
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Stores a value into the pointer, returning the previous value.
swap
takes an Ordering
argument which describes the memory ordering
of this operation. All ordering modes are possible. Note that using
Acquire
makes the store part of this operation Relaxed
, and
using Release
makes the load part Relaxed
.
Examples
use std::sync::atomic::{AtomicPtr, Ordering}; let ptr = &mut 5; let some_ptr = AtomicPtr::new(ptr); let other_ptr = &mut 10; let value = some_ptr.swap(other_ptr, Ordering::Relaxed);Run
pub fn compare_and_swap(
&self,
current: *mut T,
new: *mut T,
order: Ordering
) -> *mut T
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&self,
current: *mut T,
new: *mut T,
order: Ordering
) -> *mut T
Stores a value into the pointer if the current value is the same as the current
value.
The return value is always the previous value. If it is equal to current
, then the value
was updated.
compare_and_swap
also takes an Ordering
argument which describes the memory
ordering of this operation. Notice that even when using AcqRel
, the operation
might fail and hence just perform an Acquire
load, but not have Release
semantics.
Using Acquire
makes the store part of this operation Relaxed
if it
happens, and using Release
makes the load part Relaxed
.
Examples
use std::sync::atomic::{AtomicPtr, Ordering}; let ptr = &mut 5; let some_ptr = AtomicPtr::new(ptr); let other_ptr = &mut 10; let another_ptr = &mut 10; let value = some_ptr.compare_and_swap(other_ptr, another_ptr, Ordering::Relaxed);Run
pub fn compare_exchange(
&self,
current: *mut T,
new: *mut T,
success: Ordering,
failure: Ordering
) -> Result<*mut T, *mut T>
1.10.0[src]
&self,
current: *mut T,
new: *mut T,
success: Ordering,
failure: Ordering
) -> Result<*mut T, *mut T>
Stores a value into the pointer if the current value is the same as the current
value.
The return value is a result indicating whether the new value was written and containing
the previous value. On success this value is guaranteed to be equal to current
.
compare_exchange
takes two Ordering
arguments to describe the memory
ordering of this operation. The first describes the required ordering if the
operation succeeds while the second describes the required ordering when the
operation fails. Using Acquire
as success ordering makes the store part
of this operation Relaxed
, and using Release
makes the successful load
Relaxed
. The failure ordering can only be SeqCst
, Acquire
or Relaxed
and must be equivalent to or weaker than the success ordering.
Examples
use std::sync::atomic::{AtomicPtr, Ordering}; let ptr = &mut 5; let some_ptr = AtomicPtr::new(ptr); let other_ptr = &mut 10; let another_ptr = &mut 10; let value = some_ptr.compare_exchange(other_ptr, another_ptr, Ordering::SeqCst, Ordering::Relaxed);Run
pub fn compare_exchange_weak(
&self,
current: *mut T,
new: *mut T,
success: Ordering,
failure: Ordering
) -> Result<*mut T, *mut T>
1.10.0[src]
&self,
current: *mut T,
new: *mut T,
success: Ordering,
failure: Ordering
) -> Result<*mut T, *mut T>
Stores a value into the pointer if the current value is the same as the current
value.
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.
compare_exchange_weak
takes two Ordering
arguments to describe the memory
ordering of this operation. The first describes the required ordering if the
operation succeeds while the second describes the required ordering when the
operation fails. Using Acquire
as success ordering makes the store part
of this operation Relaxed
, and using Release
makes the successful load
Relaxed
. The failure ordering can only be SeqCst
, Acquire
or Relaxed
and must be equivalent to or weaker than the success ordering.
Examples
use std::sync::atomic::{AtomicPtr, Ordering}; let some_ptr = AtomicPtr::new(&mut 5); let new = &mut 10; let mut old = some_ptr.load(Ordering::Relaxed); loop { match some_ptr.compare_exchange_weak(old, new, Ordering::SeqCst, Ordering::Relaxed) { Ok(_) => break, Err(x) => old = x, } }Run
Trait Implementations
impl<T> From<*mut T> for AtomicPtr<T>
1.23.0[src]
impl<T> Default for AtomicPtr<T>
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impl<T> Send for AtomicPtr<T>
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impl<T> Pointer for AtomicPtr<T>
1.24.0[src]
impl<T> Debug for AtomicPtr<T>
1.3.0[src]
impl<T> Sync for AtomicPtr<T>
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impl<T> RefUnwindSafe for AtomicPtr<T>
1.14.0[src]
Blanket Implementations
impl<T, U> TryFrom<U> for T where
U: Into<T>,
[src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
ⓘImportant traits for &'_ mut Ffn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,