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      <p>In previous releases, the --enable-pthread_self configuration option was
used to force Berkeley DB to use the POSIX pthread pthread_self function to
identify threads of control (even when Berkeley DB was configured for
test-and-set mutexes).  In the 4.5 release, the --enable-pthread_self
option has been replaced with the
--enable-pthread_api option.  
This option has the same effect as
the previous option, but configures the Berkeley DB build for a POSIX pthread
application in other ways (for example, configuring Berkeley DB to use the
pthread_self function).</p>
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