git-svn-id: file:///svn/toku/tokudb@11672 c7de825b-a66e-492c-adef-691d508d4ae1

Addresses #1736, #1398  Move extern declaration of STRADDLE_HACK_INSIDE_CALLBACK from cachetable.c to cachetable.h to allow build on Windows.

git-svn-id: file:///svn/toku/tokudb@11660 c7de825b-a66e-492c-adef-691d508d4ae1

Addresses #1736, #1398 When inside straddle_hack callback don't use normal rwlock_read_lock for get_and_pin, but simply increment reader count instead. This prevents deadlock where callback waits for end_checkpoint to release write lock, but while end_checkpoint waits for callback to release read lock.

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Closign and opening a cachefile is now threadsafe (race condition when trying to open during a close).
If race condition hits, it will stall the open till the close is done.
All opens are now single threaded.  This can be improved if it causes a bottleneck.

Added comments for possible future race conditions after lock refinement.

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When a new brt is open, it takes over responsibilities of all existing zombie brts, and closes them.
When a brt closes, if other brts exist, it passes off responsibilities and closes immediately.  It only becomes a zombie if no other brts exist.

(Everything above is in context of a single header).

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modified other checkpoint tests for common code.


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may be useful for debugging.  In any case, they're harmless.

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Addresses #1691 Further fixes to a race condition where refcounts in a cachefile were not protected by any lock.
See [11371] removed most of the causes of this (by limiting the places where refcount was edited).
Now (cachefile) refcounts are protected by the cachetable_lock.

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get handlerton compiling on windows

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Remove transactions' need to count references to cachefiles (they already have references to brts)
Errors in rolling back certain functions were ignored (r = blah; return something_else);
They are now reported, so diskfull had to be updated to expect ENOSPC under certain circumstances.

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Addresses #1691 Txn that created or locked when empty is now per dictionary (in header instead of brt)
We clear it when the transaction closes (this means we cannot change it when it is already set till that transaction finishes).
This fixes a crash in windows in root_fifo_2.tdb

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Verify that inserts done during checkpoint do not appear 
in checkpoint snapshot but do appear in dictionary after 
checkpoint is complete.


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in logic that shrinks files (to free disk space) when possible.

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