Type Alias HttpCacheState

type HttpCacheState = Mutex<HashMap<CacheKey, Arc<(Mutex<HttpCacheEntryState>, Condvar)>>>;

Aliased Type

struct HttpCacheState { /* private fields */ }

Implementations

impl<T> Mutex<T>

pub const fn new(t: T) -> Mutex<T>

Creates a new mutex in an unlocked state ready for use.

Examples

use std::sync::Mutex;

let mutex = Mutex::new(0);

pub fn get_cloned(&self) -> Result<T, PoisonError<()>>

where T: Clone,

🔬This is a nightly-only experimental API. (lock_value_accessors)

Returns the contained value by cloning it.

Errors

If another user of this mutex panicked while holding the mutex, then this call will return an error instead.

Examples

#![feature(lock_value_accessors)]

use std::sync::Mutex;

let mut mutex = Mutex::new(7);

assert_eq!(mutex.get_cloned().unwrap(), 7);

pub fn set(&self, value: T) -> Result<(), PoisonError<T>>

🔬This is a nightly-only experimental API. (lock_value_accessors)

Sets the contained value.

Errors

If another user of this mutex panicked while holding the mutex, then this call will return an error containing the provided value instead.

Examples

#![feature(lock_value_accessors)]

use std::sync::Mutex;

let mut mutex = Mutex::new(7);

assert_eq!(mutex.get_cloned().unwrap(), 7);
mutex.set(11).unwrap();
assert_eq!(mutex.get_cloned().unwrap(), 11);

pub fn replace(&self, value: T) -> Result<T, PoisonError<T>>

🔬This is a nightly-only experimental API. (lock_value_accessors)

Replaces the contained value with value, and returns the old contained value.

Errors

If another user of this mutex panicked while holding the mutex, then this call will return an error containing the provided value instead.

Examples

#![feature(lock_value_accessors)]

use std::sync::Mutex;

let mut mutex = Mutex::new(7);

assert_eq!(mutex.replace(11).unwrap(), 7);
assert_eq!(mutex.get_cloned().unwrap(), 11);

impl<T> Mutex<T>

where T: ?Sized,

pub fn lock(&self) -> Result<MutexGuard<'_, T>, PoisonError<MutexGuard<'_, T>>>

Acquires a mutex, blocking the current thread until it is able to do so.

This function will block the local thread until it is available to acquire the mutex. Upon returning, the thread is the only thread with the lock held. An RAII guard is returned to allow scoped unlock of the lock. When the guard goes out of scope, the mutex will be unlocked.

The exact behavior on locking a mutex in the thread which already holds the lock is left unspecified. However, this function will not return on the second call (it might panic or deadlock, for example).

Errors

If another user of this mutex panicked while holding the mutex, then this call will return an error once the mutex is acquired. The acquired mutex guard will be contained in the returned error.

Panics

This function might panic when called if the lock is already held by the current thread.

Examples

use std::sync::{Arc, Mutex};
use std::thread;

let mutex = Arc::new(Mutex::new(0));
let c_mutex = Arc::clone(&mutex);

thread::spawn(move || {
    *c_mutex.lock().unwrap() = 10;
}).join().expect("thread::spawn failed");
assert_eq!(*mutex.lock().unwrap(), 10);

pub fn try_lock( &self, ) -> Result<MutexGuard<'_, T>, TryLockError<MutexGuard<'_, T>>>

Attempts to acquire this lock.

If the lock could not be acquired at this time, then Err is returned. Otherwise, an RAII guard is returned. The lock will be unlocked when the guard is dropped.

This function does not block.

Errors

If another user of this mutex panicked while holding the mutex, then this call will return the Poisoned error if the mutex would otherwise be acquired. An acquired lock guard will be contained in the returned error.

If the mutex could not be acquired because it is already locked, then this call will return the WouldBlock error.

Examples

use std::sync::{Arc, Mutex};
use std::thread;

let mutex = Arc::new(Mutex::new(0));
let c_mutex = Arc::clone(&mutex);

thread::spawn(move || {
    let mut lock = c_mutex.try_lock();
    if let Ok(ref mut mutex) = lock {
        **mutex = 10;
    } else {
        println!("try_lock failed");
    }
}).join().expect("thread::spawn failed");
assert_eq!(*mutex.lock().unwrap(), 10);

pub fn is_poisoned(&self) -> bool

Determines whether the mutex is poisoned.

If another thread is active, the mutex can still become poisoned at any time. You should not trust a false value for program correctness without additional synchronization.

Examples

use std::sync::{Arc, Mutex};
use std::thread;

let mutex = Arc::new(Mutex::new(0));
let c_mutex = Arc::clone(&mutex);

let _ = thread::spawn(move || {
    let _lock = c_mutex.lock().unwrap();
    panic!(); // the mutex gets poisoned
}).join();
assert_eq!(mutex.is_poisoned(), true);

pub fn clear_poison(&self)

Clear the poisoned state from a mutex.

If the mutex is poisoned, it will remain poisoned until this function is called. This allows recovering from a poisoned state and marking that it has recovered. For example, if the value is overwritten by a known-good value, then the mutex can be marked as un-poisoned. Or possibly, the value could be inspected to determine if it is in a consistent state, and if so the poison is removed.

Examples

use std::sync::{Arc, Mutex};
use std::thread;

let mutex = Arc::new(Mutex::new(0));
let c_mutex = Arc::clone(&mutex);

let _ = thread::spawn(move || {
    let _lock = c_mutex.lock().unwrap();
    panic!(); // the mutex gets poisoned
}).join();

assert_eq!(mutex.is_poisoned(), true);
let x = mutex.lock().unwrap_or_else(|mut e| {
    **e.get_mut() = 1;
    mutex.clear_poison();
    e.into_inner()
});
assert_eq!(mutex.is_poisoned(), false);
assert_eq!(*x, 1);

pub fn into_inner(self) -> Result<T, PoisonError<T>>

Consumes this mutex, returning the underlying data.

Errors

If another user of this mutex panicked while holding the mutex, then this call will return an error containing the the underlying data instead.

Examples

use std::sync::Mutex;

let mutex = Mutex::new(0);
assert_eq!(mutex.into_inner().unwrap(), 0);

pub fn get_mut(&mut self) -> Result<&mut T, PoisonError<&mut T>>

Returns a mutable reference to the underlying data.

Since this call borrows the Mutex mutably, no actual locking needs to take place – the mutable borrow statically guarantees no locks exist.

Errors

If another user of this mutex panicked while holding the mutex, then this call will return an error containing a mutable reference to the underlying data instead.

Examples

use std::sync::Mutex;

let mut mutex = Mutex::new(0);
*mutex.get_mut().unwrap() = 10;
assert_eq!(*mutex.lock().unwrap(), 10);

Trait Implementations

impl<C> ClockSequence for Mutex<C>

where C: ClockSequence + RefUnwindSafe,

type Output = <C as ClockSequence>::Output

The type of sequence returned by this counter.

fn generate_sequence( &self, seconds: u64, subsec_nanos: u32, ) -> <Mutex<C> as ClockSequence>::Output

Get the next value in the sequence to feed into a timestamp.

fn generate_timestamp_sequence( &self, seconds: u64, subsec_nanos: u32, ) -> (<Mutex<C> as ClockSequence>::Output, u64, u32)

Get the next value in the sequence, potentially also adjusting the timestamp.

fn usable_bits(&self) -> usize

where <Mutex<C> as ClockSequence>::Output: Sized,

The number of usable bits from the least significant bit in the result of ClockSequence::generate_sequence or ClockSequence::generate_timestamp_sequence.

impl<T> Debug for Mutex<T>

where T: Debug + ?Sized,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<T> Default for Mutex<T>

where T: Default + ?Sized,

fn default() -> Mutex<T>

Creates a Mutex<T>, with the Default value for T.

impl<'de, T> Deserialize<'de> for Mutex<T>

where T: Deserialize<'de>,

fn deserialize<D>( deserializer: D, ) -> Result<Mutex<T>, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> From<T> for Mutex<T>

fn from(t: T) -> Mutex<T>

Creates a new mutex in an unlocked state ready for use. This is equivalent to Mutex::new.

impl<T> MallocSizeOf for Mutex<T>

where T: MallocSizeOf,

If a mutex is stored directly as a member of a data type that is being measured, it is the unique owner of its contents and deserves to be measured.

If a mutex is stored inside of an Arc value as a member of a data type that is being measured, the Arc will not be automatically measured so there is no risk of overcounting the mutex’s contents.

fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself.

impl<T> MallocSizeOf for Mutex<T>

where T: MallocSizeOf,

If a mutex is stored directly as a member of a data type that is being measured, it is the unique owner of its contents and deserves to be measured.

If a mutex is stored inside of an Arc value as a member of a data type that is being measured, the Arc will not be automatically measured so there is no risk of overcounting the mutex’s contents.

fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself.

impl<T> Serialize for Mutex<T>

where T: Serialize + ?Sized,

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<T> RefUnwindSafe for Mutex<T>

where T: ?Sized,

impl<T> Send for Mutex<T>

where T: Send + ?Sized,

impl<T> Sync for Mutex<T>

where T: Send + ?Sized,

impl<T> UnwindSafe for Mutex<T>

where T: ?Sized,