/usr/lib/ocaml/oUnit/oUnitShared.ml is in libounit-ocaml-dev 2.0.0-2build1.
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(* The OUnit library *)
(* *)
(* Copyright (C) 2002-2008 Maas-Maarten Zeeman. *)
(* Copyright (C) 2010 OCamlCore SARL *)
(* Copyright (C) 2013 Sylvain Le Gall *)
(* *)
(* The package OUnit is copyright by Maas-Maarten Zeeman, OCamlCore SARL *)
(* and Sylvain Le Gall. *)
(* *)
(* Permission is hereby granted, free of charge, to any person obtaining *)
(* a copy of this document and the OUnit software ("the Software"), to *)
(* deal in the Software without restriction, including without limitation *)
(* the rights to use, copy, modify, merge, publish, distribute, *)
(* sublicense, and/or sell copies of the Software, and to permit persons *)
(* to whom the Software is furnished to do so, subject to the following *)
(* conditions: *)
(* *)
(* The above copyright notice and this permission notice shall be *)
(* included in all copies or substantial portions of the Software. *)
(* *)
(* The Software is provided ``as is'', without warranty of any kind, *)
(* express or implied, including but not limited to the warranties of *)
(* merchantability, fitness for a particular purpose and noninfringement. *)
(* In no event shall Maas-Maarten Zeeman be liable for any claim, damages *)
(* or other liability, whether in an action of contract, tort or *)
(* otherwise, arising from, out of or in connection with the Software or *)
(* the use or other dealings in the software. *)
(* *)
(* See LICENSE.txt for details. *)
(**************************************************************************)
exception Lock_failure
type scope = ScopeGlobal | ScopeProcess
type 'a shared_noscope =
{
lock: 'a -> unit;
unlock: 'a -> unit;
try_lock: 'a -> bool;
}
type shared =
{
global: int shared_noscope;
process: int shared_noscope;
}
let get_scoped shared =
function
| ScopeGlobal -> shared.global
| ScopeProcess -> shared.process
(* Global variable that need to be set for threads. *)
let mutex_create =
ref (fun () ->
let r = ref false in
let try_lock () =
if !r then begin
false
end else begin
r := true;
true
end
in
let lock () =
if not (try_lock ()) then
raise Lock_failure
in
let unlock () =
r := false
in
{
lock = lock;
try_lock = try_lock;
unlock = unlock;
})
module Mutex =
struct
type t = int * scope
let create scope =
(Oo.id (object end), scope)
let lock shared (id, scope) =
(get_scoped shared scope).lock id
let try_lock shared (id, scope) =
(get_scoped shared scope).try_lock id
let unlock shared (id, scope) =
(get_scoped shared scope).unlock id
let with_lock shared mutex f =
try
let res =
lock shared mutex;
f ()
in
unlock shared mutex;
res
with e ->
unlock shared mutex;
raise e
end
(* A simple shared_noscope that works only for 1 process. *)
let noscope_create () =
let state = Hashtbl.create 13 in
let state_mutex = !mutex_create () in
let get_mutex id =
let mutex =
state_mutex.lock ();
try
Hashtbl.find state id
with Not_found ->
let mutex = !mutex_create () in
Hashtbl.add state id mutex;
mutex
in
state_mutex.unlock ();
mutex
in
let try_lock id =
(get_mutex id).try_lock ()
in
let lock id =
(get_mutex id).lock ()
in
let unlock id =
(get_mutex id).unlock ()
in
{
lock = lock;
unlock = unlock;
try_lock = try_lock;
}
(* Create a shared, for 1 process. *)
let create () =
let scoped = noscope_create () in
{
global = scoped;
process = scoped;
}
|