linux-kernel - Re: [PATCH 07/30] perf tools: Add reference counting for thread

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Message-ID: <20150615192544.GF5845@kernel.org>
Date:	Mon, 15 Jun 2015 16:25:44 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 07/30] perf tools: Add reference counting for thread_map
 object

Em Sun, Jun 14, 2015 at 10:19:22AM +0200, Jiri Olsa escreveu:
> Adding refference counting for thread_map object, so
> it could be easily shared among other objects.
> 
> Using thread_map__put instead thread_map__delete and making
> thread_map__delete static.
 
<SNIP>

> +struct thread_map *thread_map__get(struct thread_map *map)
> +{
> +	atomic_inc(&map->refcnt);
> +	return map;
> +}
> +
> +void thread_map__put(struct thread_map *map)
> +{
> +	if (map && atomic_dec_and_test(&map->refcnt))
> +		thread_map__delete(map);
>  }

See comment on the other struct being refcounted, get/put should
both accept NULL maps, to avoid having to check it in the users,
just like with free().

- Arnaldo
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