When there is no idle workerthread available, an incoming requests will
get queued until a thread becomes available.

We called this "overflow" because it overflowed the worker thread pool.

However, "overflow" gives the impression that the request is somehow
lost, which it is not.

"queued" gives a much more precise idea what goes on.



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Rename 'purges' to 'bans' so that we can implement _real_ purges
also.

They really have been called 'bans' internally all the way through,
but for reasons now forgotten, we thought it would be too hard to
explain to people that purges were called bans in Varnish, so
the user-fronting side were named purges.

As it transpired, people were surprised that purges in varnish
did not free the storage right away, and various other kinds of
confusion also materialized.

The sky convinced me to implement real purges for efficiency
reasons when Vary is used, and of course now the name "purge"
was taken.

I'm sure people will curse about this change in the 2.x to 3.x
migration, but sooner or later it had to happen, and now it did.



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to the client or not.



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stevedore which matches the name exactly.



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inside vcl_fetch()



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this is much cleaner and does not demand a brand new python interpreter.



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bytes and make the two stevedore space variables that type.



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Be a total CPP-show-off-douche and make it very easy to add further
variables in the future, provided you can find the magic table.

Presently define three variables:


	REAL storage.$stevedore.free_space
	REAL storage.$stevedore.used_space
	BOOL storage.$stevedore.happy

Still debating if I should add a "SPACE" type to VCL, so that you
can write:
	if (storage.foobar.free_space < 1 GB) {...}

until I decide, it is a REAL, which is less than useful, because
we have no relational operators besides identity for REAL.



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Presently, you can only test for the existence of a given stevedore,
but it gets a lot of support code in place.



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This is a generalization of the trick we have used for things like
req.http.foobar, which can now also be used with other parts of
the namespace.

The plan is to use it for storage.disk1.free and similar.



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We will no longer allow an object to be split across multiple
stevedores, because the necessary logic to allow control of which
stevedores allow this (malloc, file) vs. those that cannot tolerate
this (persistent) is just not worth the effort.

It is very dubious if there are any non-disadvantages to splitting
objects across stevedores in the first place.



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Re-open #310 for 2.1.4 - trunk checks out fine.

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the fixed location HTTP fields.

Prodded by: email from anordby, in re r4603



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Fixes: #411


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Fixes #794

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Spotted by:	sky



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in critbit to avoid a malloc in the locked path.

Move the waitinglist to its own structure in preparation for Big
Things Afoot which will give it more work to do.  This saves a
pointer in objhead on average, always a good thing.

Have the worker thread preallocate a waitinglist structure.



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	STRING vmod_std.fileread(STRING filename)
function, which will read the contents of a file, typically
for use in synthetic responses.

Submitted by:	Sanjoy Das


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