From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shreyansh Jain Subject: [PATCH v9 01/25] eal: define macro container_of Date: Wed, 7 Sep 2016 19:37:53 +0530 Message-ID: <1473257297-7221-2-git-send-email-shreyansh.jain@nxp.com> References: <1466510566-9240-1-git-send-email-shreyansh.jain@nxp.com> <1473257297-7221-1-git-send-email-shreyansh.jain@nxp.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , Shreyansh Jain , "Jan Viktorin" To: Return-path: Received: from NAM03-DM3-obe.outbound.protection.outlook.com (mail-dm3nam03on0073.outbound.protection.outlook.com [104.47.41.73]) by dpdk.org (Postfix) with ESMTP id AD83B8DAD for ; Wed, 7 Sep 2016 16:09:12 +0200 (CEST) In-Reply-To: <1473257297-7221-1-git-send-email-shreyansh.jain@nxp.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Signed-off-by: Jan Viktorin Signed-off-by: Shreyansh Jain --- lib/librte_eal/common/include/rte_common.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h index 332f2a4..c5d94f3 100644 --- a/lib/librte_eal/common/include/rte_common.h +++ b/lib/librte_eal/common/include/rte_common.h @@ -322,6 +322,27 @@ 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); + * + * Some implementation already have this defined, thus, conditional + * declaration. + */ +#ifndef container_of +#define container_of(p, type, member) \ + ((type *) (((char *) (p)) - offsetof(type, member))) +#endif + #define _RTE_STR(x) #x /** Take a macro value and get a string version of it */ #define RTE_STR(x) _RTE_STR(x) -- 2.7.4