Struct std::sync::PoisonError
1.0.0· source · [−]pub struct PoisonError<T> { /* private fields */ }Expand description
A type of error which can be returned whenever a lock is acquired.
Both Mutexes and RwLocks 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 = Arc::clone(&mutex);
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);
}
};Implementations
Creates a PoisonError.
This is generally created by methods like Mutex::lock
or RwLock::read.
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 = Arc::clone(&mutex);
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());Reaches into this error indicating that a lock is poisoned, returning a reference to the underlying guard to allow access regardless.
Trait Implementations
Performs the conversion.