[PATCH] add VCL_HasBackend() (Re: Preventing dup backend names with dynamic backends in VMODs)

[Geoff Simmons]

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On 11/01/2015 12:23 PM, Geoff Simmons wrote:
> 
> This patch adds VCL_HasBackend().

Forgot to mention about this -- it might be necessary to lock the
vcl_mtx while traversing the vcl->backend_list, since a backend may be
added while the query is executing.

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