wsim: Per-client prng pool for miscellaneous randoms

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 11 insertions, 8 deletions

diff --git a/lib/igt_rand.c b/lib/igt_rand.c
index a3298a9f..b8d3a92c 100644
--- a/lib/igt_rand.c
+++ b/lib/igt_rand.c
@@ -1,19 +1,22 @@
 #include "igt_rand.h"
 
-static uint32_t state = 0x12345678;
+static uint32_t global = 0x12345678;
 
-uint32_t
-hars_petruska_f54_1_random_seed(uint32_t new_state)
+uint32_t hars_petruska_f54_1_random_seed(uint32_t new_state)
 {
-	uint32_t old_state = state;
-	state = new_state;
+	uint32_t old_state = global;
+	global = new_state;
 	return old_state;
 }
 
-uint32_t
-hars_petruska_f54_1_random_unsafe(void)
+uint32_t hars_petruska_f54_1_random(uint32_t *s)
 {
 #define rol(x,k) ((x << k) | (x >> (32-k)))
-	return state = (state ^ rol (state, 5) ^ rol (state, 24)) + 0x37798849;
+	return *s = (*s ^ rol(*s, 5) ^ rol(*s, 24)) + 0x37798849;
 #undef rol
 }
+
+uint32_t hars_petruska_f54_1_random_unsafe(void)
+{
+	return hars_petruska_f54_1_random(&global);
+}