* bradley's benchmarking changes, and
 * the big speedup in the sort-and-write-rows (slowness caused the lock in fidx2file).
Refs #2571. [t:2571]
{{{
svn merge -r 19909:20027 https://svn.tokutek.com/tokudb/toku/tokudb.2571
}}}
.


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[t:2499] Induce ENOSPC errors in more places, some concentrated at beginning of load, some concentrated at end, some sprinkled in the middle."


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ECANCELED does not exist in windows
made some functions static

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*pthread* -> *toku_pthread*
Printf format issues
Including toku_portability and toku_os before everything else

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Implement workaround.  Currently windows allows implicit casts from void* to whatever*.
May need to be revisited once windows cilk is included.

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[t:2499] Set errno so that brtloader's bl_fwrite() function gets correct error return if the real fwrite() produces an error.

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put the loader error callback in its own source file so we can reduce dependancies on cilk refs[t:2576]

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Merge the instrumentation from 2499d+2571 onto the main line (since 2499d has been merged.)  Refs #2571.  [t:2571].
{{{
svn merge -r 19857:19905 https://svn.tokutek.com/tokudb/toku/tokudb.2499d+2571
}}}
.


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{{{
svn merge -r 19523:19895 https://svn.tokutek.com/tokudb/toku/tokudb.2499d
}}}
.


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[t:2499] Added induced failure of write() with simulated enospc to loader-cleanup-test and made corresponding change in Makefile to allow use of otherwise deprecated write() system call.

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[t:2449] Export test function (override loader's fwrite) via env. Fix bug in brtloader's handling of error from overridden fwrite().
Fix bug in ydb's handling of ephemeral loader when unable to write to disk.
Improve loader-cleanup-test.

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