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authorVsevolod Stakhov <vsevolod@highsecure.ru>2014-08-24 15:07:19 +0100
committerVsevolod Stakhov <vsevolod@highsecure.ru>2014-08-24 15:07:19 +0100
commitf5ee6272cd18dcb00119a7f625223060033517cf (patch)
tree5e86c787aaf13aba971ac739c8650f1d3dc409e6
parentc22f671415c54b90c374d4022d806ef2a8685698 (diff)
downloadrspamd-f5ee6272cd18dcb00119a7f625223060033517cf.tar.gz
rspamd-f5ee6272cd18dcb00119a7f625223060033517cf.zip
Add refcounter inmplementation.
-rw-r--r--src/libutil/ref.h71
1 files changed, 71 insertions, 0 deletions
diff --git a/src/libutil/ref.h b/src/libutil/ref.h
new file mode 100644
index 000000000..a8016b16d
--- /dev/null
+++ b/src/libutil/ref.h
@@ -0,0 +1,71 @@
+/* Copyright (c) 2014, Vsevolod Stakhov
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED ''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 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.
+ */
+#ifndef REF_H_
+#define REF_H_
+
+/**
+ * @file ref.h
+ * A set of macros to handle refcounts
+ */
+
+typedef void (*ref_dtor_cb_t)(void *data);
+
+typedef struct ref_entry_s {
+ unsigned int refcount;
+ ref_dtor_cb_t dtor;
+} ref_entry_t;
+
+#define REF_INIT(obj, dtor_cb) do { \
+ (obj)->ref.refcount = 0; \
+ (obj)->ref.dtor = (ref_dtor_cb_t)(dtor_cb); \
+} while (0)
+
+#define REF_INIT_RETAIN(obj, dtor_cb) do { \
+ (obj)->ref.refcount = 1; \
+ (obj)->ref.dtor = (ref_dtor_cb_t)(dtor_cb); \
+} while (0)
+
+#ifdef HAVE_ATOMIC_BUILTINS
+#define REF_RETAIN(obj) do { \
+ __sync_add_and_fetch (&(obj)->ref.refcount, 1); \
+} while (0)
+
+#define REF_RELEASE(obj) do { \
+ unsigned int rc = __sync_sub_and_fetch (&(obj)->ref.refcount, 1); \
+ if (rc == 0 && (obj)->ref.dtor) { \
+ (obj)->ref.dtor (obj); \
+ } \
+} while (0)
+#else
+#define REF_RETAIN(obj) do { \
+ (obj)->ref.refcount ++; \
+} while (0)
+
+#define REF_RELEASE(obj) do { \
+ if (--(obj)->ref.refcount == 0 && (obj)->ref.dtor) { \
+ (obj)->ref.dtor (obj); \
+ } \
+} while (0)
+#endif
+
+#endif /* REF_H_ */