pub struct INFO_CACHE_MANAGER {
    __private_field: (),
}

Fields

__private_field: ()

Methods from Deref<Target = RwLock<BlockCacheManager>>

Locks this rwlock with shared read access, blocking the current thread until it can be acquired.

The calling thread will be blocked until there are no more writers which hold the lock. There may be other readers currently inside the lock when this method returns. This method does not provide any guarantees with respect to the ordering of whether contentious readers or writers will acquire the lock first.

Returns an RAII guard which will release this thread’s shared access once it is dropped.

let mylock = spin::RwLock::new(0);
{
    let mut data = mylock.read();
    // The lock is now locked and the data can be read
    println!("{}", *data);
    // The lock is dropped
}

Attempt to acquire this lock with shared read access.

This function will never block and will return immediately if read would otherwise succeed. Returns Some of an RAII guard which will release the shared access of this thread when dropped, or None if the access could not be granted. This method does not provide any guarantees with respect to the ordering of whether contentious readers or writers will acquire the lock first.

let mylock = spin::RwLock::new(0);
{
    match mylock.try_read() {
        Some(data) => {
            // The lock is now locked and the data can be read
            println!("{}", *data);
            // The lock is dropped
        },
        None => (), // no cigar
    };
}

Return the number of readers that currently hold the lock (including upgradable readers).

Safety

This function provides no synchronization guarantees and so its result should be considered ‘out of date’ the instant it is called. Do not use it for synchronization purposes. However, it may be useful as a heuristic.

Return the number of writers that currently hold the lock.

Because [RwLock] guarantees exclusive mutable access, this function may only return either 0 or 1.

Safety

This function provides no synchronization guarantees and so its result should be considered ‘out of date’ the instant it is called. Do not use it for synchronization purposes. However, it may be useful as a heuristic.

Force decrement the reader count.

Safety

This is extremely unsafe if there are outstanding RwLockReadGuards live, or if called more times than read has been called, but can be useful in FFI contexts where the caller doesn’t know how to deal with RAII. The underlying atomic operation uses Ordering::Release.

Force unlock exclusive write access.

Safety

This is extremely unsafe if there are outstanding RwLockWriteGuards live, or if called when there are current readers, but can be useful in FFI contexts where the caller doesn’t know how to deal with RAII. The underlying atomic operation uses Ordering::Release.

Lock this rwlock with exclusive write access, blocking the current thread until it can be acquired.

This function will not return while other writers or other readers currently have access to the lock.

Returns an RAII guard which will drop the write access of this rwlock when dropped.

let mylock = spin::RwLock::new(0);
{
    let mut data = mylock.write();
    // The lock is now locked and the data can be written
    *data += 1;
    // The lock is dropped
}

Attempt to lock this rwlock with exclusive write access.

This function does not ever block, and it will return None if a call to write would otherwise block. If successful, an RAII guard is returned.

let mylock = spin::RwLock::new(0);
{
    match mylock.try_write() {
        Some(mut data) => {
            // The lock is now locked and the data can be written
            *data += 1;
            // The lock is implicitly dropped
        },
        None => (), // no cigar
    };
}

Obtain a readable lock guard that can later be upgraded to a writable lock guard. Upgrades can be done through the RwLockUpgradableGuard::upgrade method.

Tries to obtain an upgradeable lock guard.

Trait Implementations

The resulting type after dereferencing.

Dereferences the value.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.