Trait lock_api::RawRwLockUpgrade [−][src]
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)[src]
Acquires an upgradable lock, blocking the current thread until it is able to do so.
fn try_lock_upgradable(&self) -> bool[src]
Attempts to acquire an upgradable lock without blocking.
unsafe fn unlock_upgradable(&self)[src]
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)[src]
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[src]
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.