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[204.195.33.123]) by smtp.gmail.com with ESMTPSA id d22sm467909pjw.38.2021.08.25.14.57.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Aug 2021 14:57:56 -0700 (PDT) Date: Wed, 25 Aug 2021 14:57:53 -0700 From: Stephen Hemminger <stephen@networkplumber.org> To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com> Cc: Mattias =?UTF-8?B?UsO2bm5ibG9t?= <hofors@lysator.liu.se>, "dev@dpdk.org" <dev@dpdk.org>, "olivier.matz@6wind.com" <olivier.matz@6wind.com>, "lucp.at.work@gmail.com" <lucp.at.work@gmail.com>, "david.marchand@redhat.com" <david.marchand@redhat.com>, "thomas@monjalon.net" <thomas@monjalon.net>, Ruifeng Wang <Ruifeng.Wang@arm.com>, nd <nd@arm.com> Message-ID: <20210825145753.57ea4d1d@hermes.local> In-Reply-To: <AM8PR08MB5810ECA5F477F0BF930A15FC98C69@AM8PR08MB5810.eurprd08.prod.outlook.com> References: <20210730213709.19400-1-honnappa.nagarahalli@arm.com> <20210802051652.3611-1-honnappa.nagarahalli@arm.com> <2caf4e93-6a57-503d-fafb-22ea6a4b1982@lysator.liu.se> <AM8PR08MB5810ECA5F477F0BF930A15FC98C69@AM8PR08MB5810.eurprd08.prod.outlook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [RFC v2] eal: simplify the implementation of rte_ctrl_thread_create X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Sender: "dev" <dev-bounces@dpdk.org> On Wed, 25 Aug 2021 15:23:08 +0000 Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com> wrote: > <snip> > > > > > On 2021-08-02 07:16, Honnappa Nagarahalli wrote: > > > The current described behaviour of rte_ctrl_thread_create is rigid > > > which makes the implementation of the function complex. > > > The behavior is abstracted to allow for simplified implementation. > > > > > > > Have you considered using a POSIX condition variable instead of atomics for > > synchronization? > No, I have not considered. The current implementation is complex because of the error handling of pthread_barrier_xxx APIs. I am thinking similar complexity will come in with the condition variable functions. > > I am using atomic variable in this patch to synchronize which does not need much error handling which simplifies the implementation. > > <snip> The problem with condition variables is that it then adds a mutex as well.