diff options
| author | Tom Lane | 2021-11-29 02:32:36 +0000 |
|---|---|---|
| committer | Tom Lane | 2021-11-29 02:33:07 +0000 |
| commit | 3804539e48e794781c6145c7f988f5d507418fa8 (patch) | |
| tree | 317904b43ca8c1d510b23cb8fdd7b05a75e971bc /configure.ac | |
| parent | f44ceb46ec2d8da48f6e145bf462d5620c25e079 (diff) | |
Replace random(), pg_erand48(), etc with a better PRNG API and algorithm.
Standardize on xoroshiro128** as our basic PRNG algorithm, eliminating
a bunch of platform dependencies as well as fundamentally-obsolete PRNG
code. In addition, this API replacement will ease replacing the
algorithm again in future, should that become necessary.
xoroshiro128** is a few percent slower than the drand48 family,
but it can produce full-width 64-bit random values not only 48-bit,
and it should be much more trustworthy. It's likely to be noticeably
faster than the platform's random(), depending on which platform you
are thinking about; and we can have non-global state vectors easily,
unlike with random(). It is not cryptographically strong, but neither
are the functions it replaces.
Fabien Coelho, reviewed by Dean Rasheed, Aleksander Alekseev, and myself
Discussion: https://postgr.es/m/alpine.DEB.2.22.394.2105241211230.165418@pseudo
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index b50130b3238..a5c10b8d566 100644 --- a/configure.ac +++ b/configure.ac @@ -1858,8 +1858,6 @@ AC_REPLACE_FUNCS(m4_normalize([ mkdtemp pread pwrite - random - srandom strlcat strlcpy strnlen |