Module CCLock

Utils around Mutex

A value wrapped into a Mutex, for more safety.

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 : _ 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 returns its new value.

  • since 0.16
val get_then_incr : int t -> int

get_then_incr x increments x, and returns its previous value.

  • since 0.16
val decr_then_get : int t -> int

decr_then_get x decrements x, and returns its new value.

  • since 0.16
val get_then_decr : int t -> int

get_then_decr x decrements x, and returns its previous value.

  • since 0.16
val get_then_set : bool t -> bool

get_then_set b sets b to true, and returns the old value.

  • since 0.16
val get_then_clear : bool t -> bool

get_then_clear b sets b to false, and returns the old value.

  • since 0.16