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+(************************************************************************)
+(* v * The Coq Proof Assistant / The Coq Development Team *)
+(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012 *)
+(* \VV/ **************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(************************************************************************)
+
+type 'a getter = unit -> 'a
+type 'a installer = ('a getter) -> unit
+
+let new_counter a ~incr ~build =
+ let data = ref a in
+ let m = Mutex.create () in
+ let mk_thsafe_getter f () =
+ (* - slaves must use a remote counter getter, not this one! *)
+ (* - in the main process there is a race condition between slave
+ managers (that are threads) and the main thread, hence the mutex *)
+ if !Flags.coq_slave_mode > 0 then
+ Errors.anomaly(Pp.str"Slave processes must install remote counters");
+ Mutex.lock m; let x = f () in Mutex.unlock m;
+ build x in
+ let getter = ref (mk_thsafe_getter (fun () -> data := incr !data; !data)) in
+ let installer f =
+ if !Flags.coq_slave_mode < 1 then
+ Errors.anomaly(Pp.str"Only slave processes can install a remote counter")
+ else getter := f in
+ (fun () -> !getter ()), installer
+