[pgpool-hackers: 4597] Re: Shuffle random functions and use better random numbers

[Tatsuo Ishii]

> I have pushed the patch to master branch, with slightly modified
> commit message, and credited you as a reviewer.

Attached is the followup commit to import pg_prng.c and use
pg_prng_double() for calculating a random number between 0 and 1.0.
Actually pg_prng_double() generates a random number [0, 1.0) (1.0 is
not inclusive), I think it's ok for our purpose.

[ from the commit message]

Other notes regarding the port:

- pg_prng needs to be initialized using pg_prng_strong_seed() per
  process. Currently the only caller is child.c (per session
  process). If other process needs to use pg_prng, it needs the same
  initialization as child.c.

- Some of functions in the file were not ported because they require
  additional library: pg_bitutils.c. In the future we may revisit and
  import pg_bitutils.c.

- likely/unlikely are ignored. In the future we may revisit and import
  them.

- All conditional compiling regarding "sun" or "_sun" are removed. It
  seems the platform is not used for running pgpool anymore.

- Since srandom() is not necessary any more, related code are removed
  from pgpool_main.c, child.c and pcp_worker.c.

Best regards,
--
Tatsuo Ishii
SRA OSS K.K.
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp
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