Changeset b4b961b in mainline

Timestamp:

2018-07-05T21:41:20Z (6 years ago)

Author:

Dzejrou <dzejrou@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

fa4a626

Parents:

53c6e6a

git-author:

Dzejrou <dzejrou@…> (2018-03-29 14:23:24)

git-committer:

Dzejrou <dzejrou@…> (2018-07-05 21:41:20)

Message:

cpp: added try_lock()

File:

• uspace/lib/cpp/include/impl/mutex.hpp (modified) (1 diff)

uspace/lib/cpp/include/impl/mutex.hpp

@@ -642 +642 @@
     }
 
+    namespace aux
+    {
+        template<class L>
+        int try_lock_tail(int idx, L& l)
+        {
+            if (!l.try_lock())
+                return idx;
+            else
+                return -1;
+        }
+
+        template<class L1, class... L2>
+        int try_lock_tail(int idx, L1& l1, L2&... ls)
+        {
+            if (!l1.try_lock())
+                return idx;
+
+            auto ret = try_lock_tail(idx + 1, ls...);
+            if (ret != -1)
+                l1.unlock();
+
+            return ret;
+        }
+    }
+
     template<class L1, class L2, class... L3>
-    int try_lock(L1& l1, L2& l2, L3&... ls);
+    int try_lock(L1& l1, L2& l2, L3&... ls)
+    {
+        return aux::try_lock_tail(0, l1, l2, ls...);
+    }
 
     namespace aux