Rename C++ header files to .hpp

[lttng-tools.git] / include / lttng / ref-internal.hpp

diff --git a/include/lttng/ref-internal.hpp b/include/lttng/ref-internal.hpp
new file mode 100644 (file)
index 0000000..a02ae4c
--- /dev/null
+++ b/include/lttng/ref-internal.hpp
@@ -0,0 +1,49 @@
+#ifndef LTTNG_REF_INTERNAL_H
+#define LTTNG_REF_INTERNAL_H
+
+/*
+ * LTTng - Non thread-safe reference counting
+ *
+ * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+
+typedef void (*lttng_release_func)(void *);
+
+struct lttng_ref {
+       unsigned long count;
+       lttng_release_func release;
+};
+
+static inline
+void lttng_ref_init(struct lttng_ref *ref, lttng_release_func release)
+{
+       LTTNG_ASSERT(ref);
+       ref->count = 1;
+       ref->release = release;
+}
+
+static inline
+void lttng_ref_get(struct lttng_ref *ref)
+{
+       LTTNG_ASSERT(ref);
+       ref->count++;
+       /* Overflow check. */
+       LTTNG_ASSERT(ref->count);
+}
+
+static inline
+void lttng_ref_put(struct lttng_ref *ref)
+{
+       LTTNG_ASSERT(ref);
+       /* Underflow check. */
+       LTTNG_ASSERT(ref->count);
+       if (caa_unlikely((--ref->count) == 0)) {
+               ref->release(ref);
+       }
+}
+
+#endif /* LTTNG_REF_INTERNAL_H */