aboutsummaryrefslogtreecommitdiff
path: root/src/random.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/random.cpp')
-rw-r--r--src/random.cpp7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/random.cpp b/src/random.cpp
index 6eb06c5d47..5dae80fe31 100644
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -19,6 +19,7 @@
#include <sync.h> // for Mutex
#include <util/time.h> // for GetTimeMicros()
+#include <cmath>
#include <stdlib.h>
#include <thread>
@@ -714,3 +715,9 @@ void RandomInit()
ReportHardwareRand();
}
+
+std::chrono::microseconds GetExponentialRand(std::chrono::microseconds now, std::chrono::seconds average_interval)
+{
+ double unscaled = -std::log1p(GetRand(uint64_t{1} << 48) * -0.0000000000000035527136788 /* -1/2^48 */);
+ return now + std::chrono::duration_cast<std::chrono::microseconds>(unscaled * average_interval + 0.5us);
+}