X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fprng%2Frandom.c;h=e250e28e98919eca4f3c9e880b9de54ba23d2fd5;hb=0a8d98285f46f721dabf38485df916c02d6a4675;hp=cc5702ed87b003275320e08242d794c8e5a78e36;hpb=f7dff1852b996363061e04531a15a3403351c375;p=musl

diff --git a/src/prng/random.c b/src/prng/random.c
index cc5702ed..e250e28e 100644
--- a/src/prng/random.c
+++ b/src/prng/random.c
@@ -1,10 +1,3 @@
-/*
- * random.c - Copyright © 2011 Szabolcs Nagy
- * Permission to use, copy, modify, and/or distribute this code
- * for any purpose with or without fee is hereby granted.
- * There is no warranty.
-*/
-
 #include <stdlib.h>
 #include <stdint.h>
 #include "libc.h"
@@ -12,11 +5,7 @@
 /*
 this code uses the same lagged fibonacci generator as the
 original bsd random implementation except for the seeding
-
-different seeds produce different sequences with long period
-(other libcs seed the state with a park-miller generator
-when seed=0 some fail to produce good random sequence
-others produce the same sequence as another seed)
+which was broken in the original
 */
 
 static uint32_t init[] = {
@@ -33,7 +22,7 @@ static int n = 31;
 static int i = 3;
 static int j = 0;
 static uint32_t *x = init+1;
-static int lock;
+static int lock[2];
 
 static uint32_t lcg31(uint32_t x) {
 	return (1103515245*x + 12345) & 0x7fffffff;
@@ -74,9 +63,9 @@ static void __srandom(unsigned seed) {
 }
 
 void srandom(unsigned seed) {
-	LOCK(&lock);
+	LOCK(lock);
 	__srandom(seed);
-	UNLOCK(&lock);
+	UNLOCK(lock);
 }
 
 char *initstate(unsigned seed, char *state, size_t size) {
@@ -84,7 +73,7 @@ char *initstate(unsigned seed, char *state, size_t size) {
 
 	if (size < 8)
 		return 0;
-	LOCK(&lock);
+	LOCK(lock);
 	old = savestate();
 	if (size < 32)
 		n = 0;
@@ -98,24 +87,25 @@ char *initstate(unsigned seed, char *state, size_t size) {
 		n = 63;
 	x = (uint32_t*)state + 1;
 	__srandom(seed);
-	UNLOCK(&lock);
+	savestate();
+	UNLOCK(lock);
 	return old;
 }
 
 char *setstate(char *state) {
 	void *old;
 
-	LOCK(&lock);
+	LOCK(lock);
 	old = savestate();
 	loadstate((uint32_t*)state);
-	UNLOCK(&lock);
+	UNLOCK(lock);
 	return old;
 }
 
 long random(void) {
 	long k;
 
-	LOCK(&lock);
+	LOCK(lock);
 	if (n == 0) {
 		k = x[0] = lcg31(x[0]);
 		goto end;
@@ -127,6 +117,6 @@ long random(void) {
 	if (++j == n)
 		j = 0;
 end:
-	UNLOCK(&lock);
+	UNLOCK(lock);
 	return k;
 }