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add CCLock.{decr_then_get, get_then_{decr,set,clear}}

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atomic updates for integers and bools
This commit is contained in:
Simon Cruanes 2016-01-26 01:03:08 +01:00
parent ec70f865e4
commit 067e89b1fe
2 changed files with 52 additions and 50 deletions
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56
src/threads/CCLock.ml
View file

@ -1,28 +1,5 @@
(*
copyright (c) 2013-2014, simon cruanes
all rights reserved.
redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer. redistributions in binary
form must reproduce the above copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other materials provided with
the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*)
(* This file is free software, part of containers. See file "license" for more details. *)
(** {1 Utils around Mutex} *)
@ -162,7 +139,38 @@ let get_then_incr l =
Mutex.unlock l.mutex;
x
let decr_then_get l =
Mutex.lock l.mutex;
l.content <- l.content - 1;
let x = l.content in
Mutex.unlock l.mutex;
x
let get_then_decr l =
Mutex.lock l.mutex;
let x = l.content in
l.content <- l.content - 1;
Mutex.unlock l.mutex;
x
(*$T
let l = create 0 in 1 = incr_then_get l && 1 = get l
let l = create 0 in 0 = get_then_incr l && 1 = get l
let l = create 10 in 9 = decr_then_get l && 9 = get l
let l = create 10 in 10 = get_then_decr l && 9 = get l
*)
let get_then_set l =
Mutex.lock l.mutex;
let x = l.content in
l.content <- true;
Mutex.unlock l.mutex;
x
let get_then_clear l =
Mutex.lock l.mutex;
let x = l.content in
l.content <- false;
Mutex.unlock l.mutex;
x

44
src/threads/CCLock.mli
View file

@ -1,31 +1,10 @@
(*
copyright (c) 2013-2014, simon cruanes
all rights reserved.
redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer. redistributions in binary
form must reproduce the above copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other materials provided with
the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*)
(* This file is free software, part of containers. See file "license" for more details. *)
(** {1 Utils around Mutex}
A value wrapped into a Mutex, for more safety.
@since 0.8 *)
type 'a t
@ -88,6 +67,21 @@ val incr_then_get : int t -> int
@since NEXT_RELEASE *)
val get_then_incr : int t -> int
(** [incr_then_get x] increments [x], and return its previous value
(** [get_then_incr x] increments [x], and return its previous value
@since NEXT_RELEASE *)
val decr_then_get : int t -> int
(** [decr_then_get x] decrements [x], and return its new value
@since NEXT_RELEASE *)
val get_then_decr : int t -> int
(** [get_then_decr x] decrements [x], and return its previous value
@since NEXT_RELEASE *)
val get_then_set : bool t -> bool
(** [get_then_set b] sets [b] to [true], and return the old value
@since NEXT_RELEASE *)
val get_then_clear : bool t -> bool
(** [get_then_clear b] sets [b] to [false], and return the old value
@since NEXT_RELEASE *)