Trait lock_api::RawRwLockUpgrade

pub unsafe trait RawRwLockUpgrade: RawRwLock {
    fn lock_upgradable(&self);
    fn try_lock_upgradable(&self) -> bool;
    unsafe fn unlock_upgradable(&self);
    unsafe fn upgrade(&self);
    unsafe fn try_upgrade(&self) -> bool;
}

Additional methods for RwLocks which support atomically upgrading a shared lock to an exclusive lock.

This requires acquiring a special “upgradable read lock” instead of a normal shared lock. There may only be one upgradable lock at any time, otherwise deadlocks could occur when upgrading.

Required methods

fn lock_upgradable(&self)

Acquires an upgradable lock, blocking the current thread until it is able to do so.

fn try_lock_upgradable(&self) -> bool

Attempts to acquire an upgradable lock without blocking.

unsafe fn unlock_upgradable(&self)

Releases an upgradable lock.

Safety

This method may only be called if an upgradable lock is held in the current context.

unsafe fn upgrade(&self)

Upgrades an upgradable lock to an exclusive lock.

Safety

This method may only be called if an upgradable lock is held in the current context.

unsafe fn try_upgrade(&self) -> bool

Attempts to upgrade an upgradable lock to an exclusive lock without blocking.

Safety

This method may only be called if an upgradable lock is held in the current context.

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Implementors

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