Re: [Xen-devel] [PATCH v3 13/15] libxl: introduce libxl_userdata_unlink

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-09-04 at 23:43 +0100, Wei Liu wrote:
> This will be used in later patch for xl to remove its "xl" userdata
> file.
> 
> Both CTX lock and userdata lock are taken in this API. CTX lock is taken
> to maintain locking hierarchy, but it also has a side effect to protect
> against R-M-W by other threads. Userdata lock is used to protect against
> domain destruction.
> 
> In general application should not rely on these internal locks to
> protect its own userdata files. It should deploys its own lock if it
> cares.
> 
> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>




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