Index: uspace/lib/cpp/src/refcount_obj.cpp
===================================================================
--- uspace/lib/cpp/src/refcount_obj.cpp	(revision 8add15e0d742e2ce9688f92ee8e6378e2caa7b04)
+++ uspace/lib/cpp/src/refcount_obj.cpp	(revision 8add15e0d742e2ce9688f92ee8e6378e2caa7b04)
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2019 Jaroslav Jindrak
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <__bits/refcount_obj.hpp>
+
+namespace std::aux
+{
+    void refcount_obj::increment()
+    {
+        __atomic_add_fetch(&refcount_, 1, __ATOMIC_ACQ_REL);
+    }
+
+    void refcount_obj::increment_weak()
+    {
+        __atomic_add_fetch(&weak_refcount_, 1, __ATOMIC_ACQ_REL);
+    }
+
+    bool refcount_obj::decrement()
+    {
+        if (__atomic_sub_fetch(&refcount_, 1, __ATOMIC_ACQ_REL) == 0)
+        {
+            /**
+             * First call to destroy() will delete the held object,
+             * so it doesn't matter what the weak_refcount_ is,
+             * but we added one and we need to remove it now.
+             */
+            decrement_weak();
+
+            return true;
+        }
+        else
+            return false;
+    }
+
+    bool refcount_obj::decrement_weak()
+    {
+        return __atomic_sub_fetch(&weak_refcount_, 1, __ATOMIC_ACQ_REL) == 0 && refs() == 0;
+    }
+
+    refcount_t refcount_obj::refs() const
+    {
+        return __atomic_load_n(&refcount_, __ATOMIC_RELAXED);
+    }
+
+    refcount_t refcount_obj::weak_refs() const
+    {
+        return __atomic_load_n(&weak_refcount_, __ATOMIC_RELAXED);
+    }
+
+    bool refcount_obj::expired() const
+    {
+        return refs() == 0;
+    }
+}