From: Florian Forster <octo@collectd.org>
Date: Mon, 5 Dec 2016 10:49:34 +0000 (+0100)
Subject: src/daemon/utils_random.[ch]: Implement cdrand_u().
X-Git-Tag: collectd-5.7.0~2^2~2
X-Git-Url: https://git.octo.it/?p=collectd.git;a=commitdiff_plain;h=03eb7511c9346495a50442c2be9311c101b9ccc6

src/daemon/utils_random.[ch]: Implement cdrand_u().
---

diff --git a/src/daemon/utils_random.c b/src/daemon/utils_random.c
index 34cf5b80..d490986d 100644
--- a/src/daemon/utils_random.c
+++ b/src/daemon/utils_random.c
@@ -50,7 +50,7 @@ static void cdrand_seed(void) {
   have_seed = 1;
 }
 
-double cdrand_d(void) {
+double cdrand_d() {
   double r;
 
   pthread_mutex_lock(&lock);
@@ -61,6 +61,17 @@ double cdrand_d(void) {
   return (r);
 }
 
+uint32_t cdrand_u() {
+  long r;
+
+  pthread_mutex_lock(&lock);
+  cdrand_seed();
+  r = jrand48(seed);
+  pthread_mutex_unlock(&lock);
+
+  return (uint32_t)r;
+}
+
 long cdrand_range(long min, long max) {
   long range;
   long r;
diff --git a/src/daemon/utils_random.h b/src/daemon/utils_random.h
index d56bcf6a..e25ae9b6 100644
--- a/src/daemon/utils_random.h
+++ b/src/daemon/utils_random.h
@@ -29,7 +29,15 @@
  *
  * This function is thread- and reentrant-safe.
  */
-double cdrand_d(void);
+double cdrand_d();
+
+/**
+ * cdrand_u returns a random uint32_t value uniformly distributed in the range
+ * [0-2^32).
+ *
+ * This function is thread- and reentrant-safe.
+ */
+uint32_t cdrand_u();
 
 /**
  * Returns a random long between min and max, inclusively.