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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version 1.0 to mark support for here-documents.



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them from becoming an out of memory DoS.



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The last argument to any CLI command can use this feature.

Typical example:

	vcl.inline vcl_new << 42
	backend foo {...}
	sub vcl_recv {...}
	42

The advantage is that no escaping is needed, as long as the magic
marker, in this case "42" does not match any line anywhere in the 
lines that make up the argument.

Arguments encoded this way are not subject to the "cli_buffer"
parameters size limitation.



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reflect the sum of obj.ttl and obj.grace.

Obj.grace if not set, default to $default_grace, which might have
a different value when we open the silo in a new run.

Solve this, by saving the ttl as the negative sum of (obj.ttl + obj.grace)
if obj.grace is set, or the positive obj.ttl if it is not, and by
adding $default_grace to obj.ttl in the latter case.



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of work to do, this timestamp could get behind times, and send the
thread to sleep, despite being behind on work.

Fix this, by updating the timestamp whenever we run out of work.

Add a parameter ("expiry_sleep") to control how long time the thread
will sleep so this can be tuned down on high-load servers.

Inspired by:	sky



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a change of key value.

Contrary to the previous comment in cache_expire.c, this process is
guaranteed to work because the shuffle will always terminate either
in the root position or in the bottom row.

Use this function when we adjust ttl on an object.



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Various minor nits



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Fixes: #817


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Move HSH_Freestore() to STV_Freestore(), it's a better fit.



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Split up the hitrate chapter into four and added a introduction to ESI. ESI needs a bit of work wrt params and operational factors.

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Split up the hitrate chapter into four and added a introduction to ESI. ESI needs a bit of work wrt params and operational factors.

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Seed the RAND48 generator when we seed the RANDOM generator.

This eats up one random number, so test-cases relying on order
needs to shift one down.



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sp->objcore and we can find the objhead from the objcore.

Rename it to match its remaining functionality:  recording which
busy objhead we are sleeping on.



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Only -spersistent needs it yet and we can generalize should the need
ever materialize.



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rather than the pointer, otherwise a number of nasty issues appear.



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simplifies stuff somewhat for the main code and remains the same
tricky business for -spersistent.



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