[dpdk-dev] [RFC 2/6] eal: define macro container_of
Jan Viktorin
viktorin at rehivetech.com
Mon Jan 18 17:03:03 CET 2016
Signed-off-by: Jan Viktorin <viktorin at rehivetech.com>
---
lib/librte_eal/common/include/rte_common.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index b58a384..bf6560d 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -322,6 +322,22 @@ rte_bsf32(uint32_t v)
#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
#endif
+/**
+ * Return pointer to the wrapping struct instance.
+ * Example:
+ *
+ * struct wrapper {
+ * ...
+ * struct child c;
+ * ...
+ * };
+ *
+ * struct child *x = obtain(...);
+ * struct wrapper *w = container_of(x, struct wrapper, c);
+ */
+#define container_of(p, type, member) \
+ ((type *) (((char *) (p)) - offsetof(type, member)))
+
#define _RTE_STR(x) #x
/** Take a macro value and get a string version of it */
#define RTE_STR(x) _RTE_STR(x)
--
2.7.0
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