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Berkeley DB Reference Guide:
  Upgrading Berkeley DB Applications

### Release 4.5: --enable-pthread_self

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 --with-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).

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