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

1 files changed, 0 insertions, 25 deletions

diff --git a/src/port/random.c b/src/port/random.c
deleted file mode 100644
index 2dd59a08293..00000000000
--- a/src/port/random.c
+++ /dev/null
@@ -1,25 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * random.c
- *	  random() wrapper
- *
- * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- *	  src/port/random.c
- *
- *-------------------------------------------------------------------------
- */
-
-#include "c.h"
-
-#include <math.h>
-
-
-long
-random(void)
-{
-	return pg_lrand48();
-}