Module CCLock

module CCLock: sig .. end

Utils around Mutex

A value wrapped into a Mutex, for more safety.
Since 0.8


type 'a t 
A value surrounded with a lock
val create : 'a -> 'a t
Create a new protected value
val with_lock : 'a t -> ('a -> 'b) -> 'b
with_lock l f runs f x where x is the value protected with the lock l, in a critical section. If f x fails, with_lock l f fails too but the lock is released
val try_with_lock : 'a t -> ('a -> 'b) -> 'b option
try_with_lock l f runs f x in a critical section if l is not locked. x is the value protected by the lock l. If f x fails, try_with_lock l f fails too but the lock is released
Since 0.22
module LockRef: sig .. end
Type allowing to manipulate the lock as a reference
val with_lock_as_ref : 'a t -> f:('a LockRef.t -> 'b) -> 'b
with_lock_as_ref l f calls f with a reference-like object that allows to manipulate the value of l safely. The object passed to f must not escape the function call
Since 0.13
val update : 'a t -> ('a -> 'a) -> unit
update l f replaces the content x of l with f x, atomically
val update_map : 'a t -> ('a -> 'a * 'b) -> 'b
update_map l f computes x', y = f (get l), then puts x' in l and returns y
Since 0.16
val mutex : 'a t -> Mutex.t
Underlying mutex
val get : 'a t -> 'a
Atomically get the value in the lock. The value that is returned isn't protected!
val set : 'a t -> 'a -> unit
Atomically set the value
Since 0.13
val incr : int t -> unit
Atomically increment the value
Since 0.13
val decr : int t -> unit
Atomically decrement the value
Since 0.13
val incr_then_get : int t -> int
incr_then_get x increments x, and return its new value
Since 0.16
val get_then_incr : int t -> int
get_then_incr x increments x, and return its previous value
Since 0.16
val decr_then_get : int t -> int
decr_then_get x decrements x, and return its new value
Since 0.16
val get_then_decr : int t -> int
get_then_decr x decrements x, and return its previous value
Since 0.16
val get_then_set : bool t -> bool
get_then_set b sets b to true, and return the old value
Since 0.16
val get_then_clear : bool t -> bool
get_then_clear b sets b to false, and return the old value
Since 0.16