1 files changed, 46 insertions, 0 deletions
diff --git a/odb/details/lock.hxx b/odb/details/lock.hxx
new file mode 100644
index 0000000..0ee5a6d
--- /dev/null
+++ b/odb/details/lock.hxx
@@ -0,0 +1,46 @@
+// file      : odb/details/lock.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_DETAILS_LOCK_HXX
+#define ODB_DETAILS_LOCK_HXX
+
+#include <odb/details/posix/mutex.hxx>
+
+namespace odb
+{
+  namespace details
+  {
+    struct lock
+    {
+      lock (mutex& m)
+          : mutex_ (m), locked_ (true)
+      {
+        mutex_.lock ();
+      }
+
+      ~lock ()
+      {
+        if (locked_)
+          mutex_.unlock ();
+      }
+
+      void
+      unlock ()
+      {
+        if (locked_)
+        {
+          mutex_.unlock ();
+          locked_ = true;
+        }
+      }
+
+    private:
+      mutex& mutex_;
+      bool locked_;
+    };
+  }
+}
+
+#endif // ODB_DETAILS_LOCK_HXX