From patchwork Mon Aug 23 05:49:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joyce Kong X-Patchwork-Id: 97197 X-Patchwork-Delegate: thomas@monjalon.net Return-Path: X-Original-To: patchwork@inbox.dpdk.org Delivered-To: patchwork@inbox.dpdk.org Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id F18B7A0C56; Mon, 23 Aug 2021 07:50:28 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id D5D9C41148; Mon, 23 Aug 2021 07:50:21 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mails.dpdk.org (Postfix) with ESMTP id 8632741140 for ; Mon, 23 Aug 2021 07:50:20 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id F21741FB; Sun, 22 Aug 2021 22:50:19 -0700 (PDT) Received: from net-arm-n1sdp.shanghai.arm.com (net-arm-n1sdp.shanghai.arm.com [10.169.208.222]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 9EF533F5A1; Sun, 22 Aug 2021 22:50:17 -0700 (PDT) From: Joyce Kong To: Anatoly Burakov Cc: dev@dpdk.org, thomas@monjalon.net, david.marchand@redhat.com, honnappa.nagarahalli@arm.com, ruifeng.wang@arm.com, nd@arm.com Date: Mon, 23 Aug 2021 00:49:46 -0500 Message-Id: <20210823054952.15001-3-joyce.kong@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210823054952.15001-1-joyce.kong@arm.com> References: <20210823054952.15001-1-joyce.kong@arm.com> Subject: [dpdk-dev] [PATCH v2 2/8] examples/multi_process: use compiler atomics for sync X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Convert rte_atomic32_test_and_set usage to compiler atomic CAS operation for display_stats sync. Signed-off-by: Joyce Kong Reviewed-by: Ruifeng Wang --- examples/multi_process/client_server_mp/mp_server/main.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/examples/multi_process/client_server_mp/mp_server/main.c b/examples/multi_process/client_server_mp/mp_server/main.c index 9bcee460fd..b4761ebc7b 100644 --- a/examples/multi_process/client_server_mp/mp_server/main.c +++ b/examples/multi_process/client_server_mp/mp_server/main.c @@ -20,7 +20,6 @@ #include #include #include -#include #include #include #include @@ -158,10 +157,12 @@ static int sleep_lcore(__rte_unused void *dummy) { /* Used to pick a display thread - static, so zero-initialised */ - static rte_atomic32_t display_stats; + static uint32_t display_stats; + uint32_t status = 0; /* Only one core should display stats */ - if (rte_atomic32_test_and_set(&display_stats)) { + if (__atomic_compare_exchange_n(&display_stats, &status, 1, 0, + __ATOMIC_RELAXED, __ATOMIC_RELAXED)) { const unsigned sleeptime = 1; printf("Core %u displaying statistics\n", rte_lcore_id());