From f398949b40624488b54b35d446a9b5ac46101739 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 8 Apr 2016 18:07:13 +0200
Subject: Make LocalStore thread-safe

Necessary for multi-threaded commands like "nix verify-paths".
---
 src/libutil/sync.hh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'src/libutil/sync.hh')

diff --git a/src/libutil/sync.hh b/src/libutil/sync.hh
index c99c098ac..ebe64ffbd 100644
--- a/src/libutil/sync.hh
+++ b/src/libutil/sync.hh
@@ -22,11 +22,11 @@ namespace nix {
    scope.
 */
 
-template<class T>
+template<class T, class M = std::mutex>
 class Sync
 {
 private:
-    std::mutex mutex;
+    M mutex;
     T data;
 
 public:
@@ -38,7 +38,7 @@ public:
     {
     private:
         Sync * s;
-        std::unique_lock<std::mutex> lk;
+        std::unique_lock<M> lk;
         friend Sync;
         Lock(Sync * s) : s(s), lk(s->mutex) { }
     public:
-- 
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