Struct abi_stable::external_types::parking_lot::rw_lock::RRwLock [−][src]
#[repr(C)]pub struct RRwLock<T> { /* fields omitted */ }
Expand description
A read-write lock that allows dynamic mutable/shared borrows of shared data.
RRwLock allows either multiple shared locks,or a single write lock.
Poisoning
As opposed to the standard library version of this type, this rwlock type does not use poisoning, simply unlocking the lock when a panic happens.
Example
use abi_stable::external_types::RRwLock;
static LOCK: RRwLock<usize> = RRwLock::new(0);
let guard = std::thread::spawn(|| {
for _ in 0..100 {
*LOCK.write() += 1;
}
});
for _ in 0..100 {
*LOCK.write() += 1;
}
guard.join().unwrap();
assert_eq!(*LOCK.read(), 200);
Implementations
Constructs a lock,wrapping value
.
Example
use abi_stable::external_types::RRwLock;
static LOCK: RRwLock<Option<String>> = RRwLock::new(None);
let lock = RRwLock::new(0);
Unwraps this lock into its wrapped data.
Example
use abi_stable::external_types::RRwLock;
let lock = RRwLock::new("hello".to_string());
assert_eq!(lock.into_inner().as_str(), "hello");
Gets a mutable reference to its wrapped data.
This does not require any locking,since it takes self
mutably.
Example
use abi_stable::external_types::RRwLock;
let mut lock = RRwLock::new("Hello".to_string());
lock.get_mut().push_str(", World!");
assert_eq!(lock.read().as_str(), "Hello, World!");
Acquires a lock for reading,blocking the current thread until it can.
This function returns a read guard,which releases read access when it is dropped.
Trying to lock the rwlock for reading in the same thread that has write access to the same rwlock will cause a deadlock.
Example
use abi_stable::external_types::RRwLock;
static LOCK: RRwLock<usize> = RRwLock::new(0);
*LOCK.write() += 4;
let read_guard_a = LOCK.read();
let read_guard_b = LOCK.read();
assert_eq!(*read_guard_a, 4);
assert_eq!(*read_guard_b, 4);
Attemps to acquire a lock for reading,failing if it is locked for writing.
Returns the read guard if the rwlock can be immediately acquired,otherwise returns RNone.
Example
use abi_stable::external_types::RRwLock;
static LOCK: RRwLock<usize> = RRwLock::new(0);
let mut write_guard = LOCK.write();
assert!(LOCK.try_read().is_none());
*write_guard += 4;
drop(write_guard);
assert_eq!(*LOCK.try_read().unwrap(), 4);
Attempts to acquire a lock for reading,for the timeout duration.
Once the timeout is reached,this will return None, otherwise it will return the read guard.
Example
use abi_stable::{external_types::RRwLock, std_types::RDuration};
static LOCK: RRwLock<usize> = RRwLock::new(0);
static DUR: RDuration = RDuration::from_millis(1);
let mut write_guard = LOCK.write();
assert!(LOCK.try_read_for(DUR).is_none());
*write_guard += 7;
drop(write_guard);
assert_eq!(*LOCK.try_read_for(DUR).unwrap(), 7);
Acquires a lock for writing,blocking the current thread until it can.
This function returns a write guard,which releases write access when it is dropped.
Trying to lock the rwlock in the same thread that has read or write access to the same rwlock will cause a deadlock.
Example
use abi_stable::external_types::RRwLock;
let lock = RRwLock::new(0);
let mut guard = lock.write();
*guard += 4;
assert_eq!(*guard, 4);
Attemps to acquire a lock for writing.
Returns the write guard if the rwlock can be immediately acquired,otherwise returns RNone.
Example
use abi_stable::external_types::RRwLock;
let lock = RRwLock::new(0);
let mut guard = lock.write();
assert!(lock.try_write().is_none());
*guard += 4;
assert_eq!(*guard, 4);
Attempts to acquire a lock for writing,for the timeout duration.
Once the timeout is reached,this will return None, otherwise it will return the write guard.
Example
use abi_stable::{external_types::RRwLock, std_types::RDuration};
static DUR: RDuration = RDuration::from_millis(1);
let lock = RRwLock::new(0);
let mut write_guard = lock.try_write_for(DUR).unwrap();
*write_guard += 4;
assert!(lock.try_write_for(DUR).is_none());
assert_eq!(*write_guard, 4);
Trait Implementations
type StaticEquivalent = _static_RRwLock<__GetStaticEquivalent<T>>
type IsNonZeroType = False
type IsNonZeroType = False
Whether this type has a single invalid bit-pattern. Read more
The layout of the type provided by implementors.
const
-equivalents of the associated types.
Auto Trait Implementations
impl<T> !RefUnwindSafe for RRwLock<T>
impl<T> UnwindSafe for RRwLock<T> where
T: UnwindSafe,
Blanket Implementations
Mutably borrows from an owned value. Read more
type ForSelf = WithMetadata_<T, T>
type ForSelf = WithMetadata_<T, T>
This is always WithMetadata_<Self, Self>
Compares the address of self
with the address of other
. Read more
Emulates the pipeline operator, allowing method syntax in more places. Read more
The same as piped
except that the function takes &Self
Useful for functions that take &Self
instead of Self
. Read more
The same as piped
, except that the function takes &mut Self
.
Useful for functions that take &mut Self
instead of Self
. Read more
Mutates self using a closure taking self by mutable reference, passing it along the method chain. Read more
Observes the value of self, passing it along unmodified. Useful in long method chains. Read more
Performs a conversion with Into
.
using the turbofish .into_::<_>()
syntax. Read more
Performs a reference to reference conversion with AsRef
,
using the turbofish .as_ref_::<_>()
syntax. Read more
Performs a mutable reference to mutable reference conversion with AsMut
,
using the turbofish .as_mut_::<_>()
syntax. Read more
unsafe fn transmute_element<T>(
self
) -> <Self as CanTransmuteElement<T>>::TransmutedPtr where
Self: CanTransmuteElement<T>,
unsafe fn transmute_element<T>(
self
) -> <Self as CanTransmuteElement<T>>::TransmutedPtr where
Self: CanTransmuteElement<T>,
Transmutes the element type of this pointer.. Read more
type Type = T
type Type = T
This is always Self
.
Converts a value back to the original type.
Converts a mutable reference back to the original type.
alloc
only.Converts a box back to the original type.
Converts a value back to the original type.
Converts a reference back to the original type.
Converts a mutable reference back to the original type.
alloc
only.Converts a box back to the original type.
alloc
only.Converts an Arc back to the original type.
alloc
only.Converts an Rc back to the original type.