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Re: [PATCH 03/11] include: add lock-less reference counting primitives
From: |
Samuel Thibault |
Subject: |
Re: [PATCH 03/11] include: add lock-less reference counting primitives |
Date: |
Tue, 13 May 2014 01:04:13 +0200 |
User-agent: |
Mutt/1.5.21+34 (58baf7c9f32f) (2010-12-30) |
Justus Winter, le Mon 12 May 2014 12:05:41 +0200, a écrit :
> +/* An opaque type. You must not access these values directly. */
> +typedef uint64_t refcounts_t;
> +
> +/* Instead, the functions manipulating refcounts_t values write the
> + results into this kind of objects. */
> +struct references {
> + uint32_t hard;
> + uint32_t weak;
> +};
> +
> +union _references {
> + struct references refs;
> + refcounts_t rc;
> +};
> +
> +/* Initialize REF with HARD and WEAK references. */
> +static inline void
> +refcounts_init (refcounts_t *ref, uint32_t hard, uint32_t weak)
> +{
> + ((union _references *) ref)->refs =
AIUI this cast is a case of type-puning. Why not making refcounts_t the
union itself? That way would be clearly safe with gcc's extension.
Samuel
Re: [PATCH 03/11] include: add lock-less reference counting primitives, Neal H. Walfield, 2014/05/13
Re: [PATCH 03/11] include: add lock-less reference counting primitives, Neal H. Walfield, 2014/05/13
Re: [PATCH 03/11] include: add lock-less reference counting primitives, Samuel Thibault, 2014/05/13