Imported Upstream version 0.8.0~pre1upstream/0.8.0_pre1

1 files changed, 44 insertions, 0 deletions

diff --git a/src/common/ref.c b/src/common/ref.c
new file mode 100644
index 0000000..3b9c033
--- /dev/null
+++ b/src/common/ref.c
@@ -0,0 +1,44 @@
+/*  Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+
+#include "ref.h"
+
+void ref_init(ref_t *p, ref_destructor_t dtor)
+{
+	if (p) {
+		p->count = 0;
+		p->dtor = dtor;
+	}
+}
+
+void ref_retain(ref_t *p)
+{
+	if (p) {
+		__sync_add_and_fetch(&p->count, 1);
+	}
+}
+
+void ref_release(ref_t *p)
+{
+	if (p) {
+		int rc = __sync_sub_and_fetch(&p->count, 1);
+		if (rc == 0 && p->dtor) {
+			p->dtor(p);
+		}
+	}
+}