std::sync::PoisonError - Rust
Description: API documentation for the Rust `PoisonError` struct in crate `std`.
Keywords: rust, rustlang, rust-lang, PoisonError

# 1.0.0[−][src]Struct std::sync::PoisonError

    pub struct PoisonError<T> { /* fields omitted */ }

A type of error which can be returned whenever a lock is acquired.

Both `Mutex`es and `RwLock`s are poisoned whenever a thread fails while the lock is held. The precise semantics for when a lock is poisoned is documented on each lock, but once a lock is poisoned then all future acquisitions will return this error.

# Examples

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

    let mutex = Arc::new(Mutex::new(1));

    // poison the mutex
    let c_mutex = mutex.clone();
    let _ = thread::spawn(move || {
        let mut data = c_mutex.lock().unwrap();
        *data = 2;
        panic!();
    }).join();

    match mutex.lock() {
        Ok(_) => unreachable!(),
        Err(p_err) => {
            let data = p_err.get_ref();
            println!("recovered: {}", data);
        }
    };Run

## Methods

###

`impl<T> PoisonError<T>`

[src]

####

`pub fn new(guard: T) -> PoisonError<T>`

1.2.0
[src]

Creates a `PoisonError`.

This is generally created by methods like `Mutex::lock` or `RwLock::read`.

####

`pub fn into_inner(self) -> T`

1.2.0
[src]

Consumes this error indicating that a lock is poisoned, returning the underlying guard to allow access regardless.

# Examples

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

    let mutex = Arc::new(Mutex::new(HashSet::new()));

    // poison the mutex
    let c_mutex = mutex.clone();
    let _ = thread::spawn(move || {
        let mut data = c_mutex.lock().unwrap();
        data.insert(10);
        panic!();
    }).join();

    let p_err = mutex.lock().unwrap_err();
    let data = p_err.into_inner();
    println!("recovered {} items", data.len());Run

####
ⓘImportant traits for &'a mut I

### Important traits for &'a mut I

`impl<'a, I> Iterator for &'a mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`

`pub fn get_ref(&self) -> &T`

1.2.0
[src]

Reaches into this error indicating that a lock is poisoned, returning a reference to the underlying guard to allow access regardless.

####
ⓘImportant traits for &'a mut I

### Important traits for &'a mut I

`impl<'a, I> Iterator for &'a mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`

`pub fn get_mut(&mut self) -> &mut T`

1.2.0
[src]

Reaches into this error indicating that a lock is poisoned, returning a mutable reference to the underlying guard to allow access regardless.

## Trait Implementations

###

`impl<T> Error for PoisonError<T>`

[src]

####

`fn description(&self) -> &str`

[src]

This method is soft-deprecated. Read more

####

`fn cause(&self) -> Option<&Error>`

[src]

Deprecating in 1.33.0

: replaced by Error::source, which can support downcasting

The lower-level cause of this error, if any. Read more

####

`fn source(&self) -> Option<&(Error + 'static)>`

1.30.0
[src]

The lower-level source of this error, if any. Read more

###

`impl<T> Debug for PoisonError<T>`

[src]

####

`fn fmt(&self, f: &mut Formatter) -> Result`

[src]

Formats the value using the given formatter. Read more

###

`impl<T> Display for PoisonError<T>`

[src]

####

`fn fmt(&self, f: &mut Formatter) -> Result`

[src]

Formats the value using the given formatter. Read more

###

`impl<T> From<PoisonError<T>> for TryLockError<T>`

[src]

####

`fn from(err: PoisonError<T>) -> TryLockError<T>`

[src]

Performs the conversion.

## Auto Trait Implementations

###

`impl<T> Send for PoisonError<T> where T: Send,`

###

`impl<T> Sync for PoisonError<T> where T: Sync,`

## Blanket Implementations

###

`impl<T, U> TryFrom for T where T: From<U>,`

[src]

#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

####

`fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`

[src]

🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

###

`impl<T> From for T`

[src]

####

`fn from(t: T) -> T`

[src]

Performs the conversion.

###

`impl<T, U> TryInto for T where U: TryFrom<T>,`

[src]

#### `type Error = <U as TryFrom<T>>::Error`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

####

`fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`

[src]

🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

###

`impl<T, U> Into for T where U: From<T>,`

[src]

####

`fn into(self) -> U`

[src]

Performs the conversion.

###

`impl<T> Borrow for T where T: ?Sized,`

[src]

####
ⓘImportant traits for &'a mut I

### Important traits for &'a mut I

`impl<'a, I> Iterator for &'a mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`

`fn borrow(&self) -> &T`

[src]

Immutably borrows from an owned value. Read more

###

`impl<T> BorrowMut for T where T: ?Sized,`

[src]

####
ⓘImportant traits for &'a mut I

### Important traits for &'a mut I

`impl<'a, I> Iterator for &'a mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`

`fn borrow_mut(&mut self) -> &mut T`

[src]

Mutably borrows from an owned value. Read more

###

`impl<T> Any for T where T: 'static + ?Sized,`

[src]

####

`fn get_type_id(&self) -> TypeId`

[src]

🔬 This is a nightly-only experimental API. (`get_type_id` #27745)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

###

`impl<T> ToString for T where T: Display + ?Sized,`

[src]

####

`fn to_string(&self) -> String`

[src]

Converts the given value to a `String`. Read more

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