Struct spin::rwlock::RwLockWriteGuard [−][src]
Expand description
A guard that provides mutable data access.
When the guard falls out of scope it will release the lock.
Implementations
Downgrades the writable lock guard to a readable, shared lock guard. Cannot fail and is guaranteed not to spin.
let mylock = spin::RwLock::new(0);
let mut writable = mylock.write();
*writable = 1;
let readable = writable.downgrade(); // This is guaranteed not to spin
assert_eq!(*readable, 1);Downgrades the writable lock guard to an upgradable, shared lock guard. Cannot fail and is guaranteed not to spin.
let mylock = spin::RwLock::new(0);
let mut writable = mylock.write();
*writable = 1;
let readable = writable.downgrade_to_upgradeable(); // This is guaranteed not to spin
assert_eq!(*readable, 1);Leak the lock guard, yielding a mutable reference to the underlying data.
Note that this function will permanently lock the original lock.
let mylock = spin::RwLock::new(0);
let data: &mut i32 = spin::RwLockWriteGuard::leak(mylock.write());
*data = 1;
assert_eq!(*data, 1);