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From: Olivier Matz <olivier.matz@6wind.com>
To: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Cc: dev@dpdk.org, lucp.at.work@gmail.com, stephen@networkplumber.org,
	david.marchand@redhat.com, thomas@monjalon.net,
	ruifeng.wang@arm.com, nd@arm.com
Subject: Re: [dpdk-dev] [PATCH v4 1/2] eal: simplify the implementation of rte_ctrl_thread_create
Date: Thu, 21 Oct 2021 17:46:10 +0200
Message-ID: <YXGLQoC5RQ1JS+QI@platinum> (raw)
In-Reply-To: <20211013201811.15247-1-honnappa.nagarahalli@arm.com>

Hi Honnappa,

On Wed, Oct 13, 2021 at 03:18:10PM -0500, Honnappa Nagarahalli wrote:
> Remove the usage of pthread barrier and replace it with
> synchronization using atomic variable. This also removes
> the use of reference count required to synchronize freeing
> the memory.
> 
> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>

Reviewed-by: Olivier Matz <olivier.matz@6wind.com>

Few cosmetics comments below.

(...)

> +enum __rte_ctrl_thread_status {
> +	__RTE_CTRL_THREAD_LAUNCHING, /* Yet to call pthread_create function */
> +	__RTE_CTRL_THREAD_RUNNING, /* Control thread is running successfully */
> +	__RTE_CTRL_THREAD_ERROR /* Control thread encountered an error */
> +};
> +

Are there double underscores needed?
I think even the rte_ prefix could be removed since this is not exposed.

(...)

> @@ -236,24 +239,22 @@ rte_ctrl_thread_create(pthread_t *thread, const char *name,
>  				"Cannot set name for ctrl thread\n");
>  	}
>  
> -	ret = pthread_setaffinity_np(*thread, sizeof(*cpuset), cpuset);
> -	if (ret != 0)
> -		params->start_routine = NULL;
> -
> -	pthread_barrier_wait(&params->configured);
> -	ctrl_params_free(params);
> -
> -	if (ret != 0)
> -		/* start_routine has been set to NULL above; */
> -		/* ctrl thread will exit immediately */
> +	/* Wait for the control thread to initialize successfully */
> +	while ((ctrl_thread_status =
> +		__atomic_load_n(&params->ctrl_thread_status, __ATOMIC_ACQUIRE))
> +		== __RTE_CTRL_THREAD_LAUNCHING)
> +		/* Yield the CPU. Using sched_yield call requires maintaining
> +		 * another implementation for Windows as sched_yield is not
> +		 * supported on Windows.
> +		 */
> +		rte_delay_us_sleep(1);
> +
> +	/* Check if the control thread encountered an error */
> +	if (ctrl_thread_status == __RTE_CTRL_THREAD_ERROR)
> +		/* ctrl thread is exiting */
>  		pthread_join(*thread, NULL);

While not required, I suggest to use curly brackets when the number of lines
in the body of the loop or test (including comments).


Thanks
Olivier

  parent reply	other threads:[~2021-10-21 15:46 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 21:37 [dpdk-dev] [RFC] " Honnappa Nagarahalli
2021-08-02  5:16 ` [dpdk-dev] [RFC v2] " Honnappa Nagarahalli
2021-08-23 10:16   ` Olivier Matz
2021-08-24 20:03     ` Honnappa Nagarahalli
2021-08-24 21:30       ` Stephen Hemminger
2021-08-25  1:26         ` Honnappa Nagarahalli
2021-08-25 15:19         ` Mattias Rönnblom
2021-08-25 15:31           ` Honnappa Nagarahalli
2021-09-01 20:04             ` Mattias Rönnblom
2021-09-01 22:21               ` Honnappa Nagarahalli
2021-08-30 22:30         ` Honnappa Nagarahalli
2021-08-25 15:12   ` Mattias Rönnblom
2021-08-25 15:23     ` Honnappa Nagarahalli
2021-08-25 21:57       ` Stephen Hemminger
2021-08-25 18:48 ` [dpdk-dev] [RFC] " Luc Pelletier
2021-08-25 19:26   ` Honnappa Nagarahalli
2021-08-30 16:34 ` [dpdk-dev] [PATCH v3 1/2] " Honnappa Nagarahalli
2021-08-30 16:34   ` [dpdk-dev] [PATCH v3 2/2] test/eal: add a test for rte_ctrl_thread_create Honnappa Nagarahalli
2021-08-30 16:41     ` Stephen Hemminger
2021-08-30 16:42       ` Honnappa Nagarahalli
2021-08-30 16:44   ` [dpdk-dev] [PATCH v3 1/2] eal: simplify the implementation of rte_ctrl_thread_create Stephen Hemminger
2021-08-30 22:12     ` Honnappa Nagarahalli
2021-10-13 20:18 ` [dpdk-dev] [PATCH v4 " Honnappa Nagarahalli
2021-10-13 20:18   ` [dpdk-dev] [PATCH v4 2/2] test/eal: add a test for rte_ctrl_thread_create Honnappa Nagarahalli
2021-10-21 15:46   ` Olivier Matz [this message]
2021-10-21 20:49     ` [dpdk-dev] [PATCH v4 1/2] eal: simplify the implementation of rte_ctrl_thread_create Honnappa Nagarahalli
2021-10-21 21:32 ` [dpdk-dev] [PATCH v5 " Honnappa Nagarahalli
2021-10-21 21:32   ` [dpdk-dev] [PATCH v5 2/2] test/eal: add a test for rte_ctrl_thread_create Honnappa Nagarahalli
2021-10-22  8:35     ` Olivier Matz
2021-10-25 19:46       ` David Marchand

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