mirror of
https://github.com/c-cube/ocaml-containers.git
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136 lines
3.2 KiB
OCaml
136 lines
3.2 KiB
OCaml
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(*
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copyright (c) 2013-2014, simon cruanes
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all rights reserved.
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redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer. redistributions in binary
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form must reproduce the above copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other materials provided with
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the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*)
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(** {1 Utils around Mutex} *)
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type 'a t = {
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mutex : Mutex.t;
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mutable content : 'a;
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}
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type 'a lock = 'a t
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let create content = {
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mutex = Mutex.create();
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content;
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}
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let with_lock l f =
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Mutex.lock l.mutex;
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try
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let x = f l.content in
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Mutex.unlock l.mutex;
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x
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with e ->
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Mutex.unlock l.mutex;
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raise e
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(*$R
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let l = create 0 in
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let try_incr l =
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update l (fun x -> Thread.yield(); x+1)
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in
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for i = 1 to 10 do ignore (Thread.create try_incr l) done;
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Thread.delay 0.10 ;
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assert_equal 10 (get l)
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*)
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module LockRef = struct
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type 'a t = 'a lock
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let get t = t.content
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let set t x = t.content <- x
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let update t f = t.content <- f t.content
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end
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let with_lock_as_ref l ~f =
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Mutex.lock l.mutex;
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try
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let x = f l in
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Mutex.unlock l.mutex;
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x
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with e ->
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Mutex.unlock l.mutex;
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raise e
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(*$R
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let l = create 0 in
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let test_it l =
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with_lock_as_ref l
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~f:(fun r ->
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let x = LockRef.get r in
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LockRef.set r (x+10);
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Thread.yield ();
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let y = LockRef.get r in
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LockRef.set r (y - 10);
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)
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in
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for i = 1 to 100 do ignore (Thread.create test_it l) done;
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Thread.delay 0.10;
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assert_equal 0 (get l)
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*)
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let mutex l = l.mutex
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let update l f =
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with_lock l (fun x -> l.content <- f x)
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(*$T
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let l = create 5 in update l (fun x->x+1); get l = 6
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*)
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let get l =
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Mutex.lock l.mutex;
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let x = l.content in
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Mutex.unlock l.mutex;
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x
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let set l x =
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Mutex.lock l.mutex;
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l.content <- x;
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Mutex.unlock l.mutex
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(*$T
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let l = create 0 in set l 4; get l = 4
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let l = create 0 in set l 4; set l 5; get l = 5
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*)
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let incr l = update l (fun x -> x+1)
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let decr l = update l (fun x -> x-1)
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(*$R
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let l = create 0 in
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let a = Array.init 100 (fun _ -> Thread.create (fun _ -> incr l) ()) in
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Array.iter Thread.join a;
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assert_equal ~printer:CCInt.to_string 100 (get l)
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*)
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(*$T
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let l = create 0 in incr l ; get l = 1
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let l = create 0 in decr l ; get l = ~-1
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*)
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