is rand_s broken

Author: swenson

stresstest.c

@@ -62,21 +62,47 @@ static __inline int simple_cmp(const void *a, const void *b) {
 #ifdef _WIN32
 
 #include <time.h>
+/*  Written in 2015 by Sebastiano Vigna ([email protected])
+
+To the extent possible under law, the author has dedicated all copyright
+and related and neighboring rights to this software to the public domain
+worldwide. This software is distributed without any warranty.
+
+See <http://creativecommons.org/publicdomain/zero/1.0/>. */
+
+#include <stdint.h>
+
+/* This is a fixed-increment version of Java 8's SplittableRandom generator
+   See http://dx.doi.org/10.1145/2714064.2660195 and
+   http://docs.oracle.com/javase/8/docs/api/java/util/SplittableRandom.html
+
+   It is a very fast generator passing BigCrush, and it can be useful if
+   for some reason you absolutely want 64 bits of state. */
+
+static uint64_t x; /* The state can be seeded with any value. */
+
+uint64_t next() {
+	uint64_t z = (x += 0x9e3779b97f4a7c15);
+	z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
+	z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
+	return z ^ (z >> 31);
+}
 static __inline void srand48(long seed) {
-  srand(seed);
+  //srand(seed);
+  x = seed;
 }
 
 static __inline long lrand48(void) {
-  int x;
-  rand_s(&x);
-  return x & 0x7fffffff;
+  return next() & 0x7fffffff;
+  // int x;
+  // rand_s(&x);
+  // return x & 0x7fffffff;
 }
 
 static __inline double utime(void) {
-  //struct timespec ts;
-  //timespec_get(&ts, TIME_UTC);
-  //return 1000000.0 * ts.tv_sec + ts.tv_nsec / 1000.0;
-  return lrand48();
+  struct timespec ts;
+  timespec_get(&ts, TIME_UTC);
+  return 1000000.0 * ts.tv_sec + ts.tv_nsec / 1000.0;
 }
 #else