ir: consolidate reference counting functions

[babeltrace.git] / include / babeltrace / ref-internal.h

diff --git a/include/babeltrace/ref-internal.h b/include/babeltrace/ref-internal.h
new file mode 100644 (file)
index 0000000..a8eec33
--- /dev/null
+++ b/include/babeltrace/ref-internal.h
@@ -0,0 +1,67 @@
+#ifndef BABELTRACE_REF_INTERNAL_H
+#define BABELTRACE_REF_INTERNAL_H
+
+/*
+ * Babeltrace - reference counting
+ *
+ * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <assert.h>
+
+struct bt_ref;
+
+typedef void (*bt_ref_release_func_t)(struct bt_ref *);
+
+struct bt_ref {
+       long refcount;
+       bt_ref_release_func_t release_func;
+};
+
+static inline
+void bt_ref_init(struct bt_ref *ref,
+       bt_ref_release_func_t release_func)
+{
+       assert(ref);
+       ref->refcount = 1;
+       ref->release_func = release_func;
+}
+
+static inline
+void bt_ref_get(struct bt_ref *ref)
+{
+       assert(ref);
+       ref->refcount++;
+}
+
+static inline
+void bt_ref_put(struct bt_ref *ref)
+{
+       assert(ref);
+       assert(ref->release_func);
+       if ((--ref->refcount) == 0) {
+               ref->release_func(ref);
+       }
+}
+
+#endif /* BABELTRACE_REF_INTERNAL_H */