Add time helpers for std::chrono::steady_clock

Author: MarcoFalke

src/test/util_tests.cpp

@@ -1488,19 +1488,23 @@ BOOST_AUTO_TEST_CASE(util_time_GetTime)
 {
     SetMockTime(111);
     // Check that mock time does not change after a sleep
-    for (const auto& num_sleep : {0, 1}) {
-        UninterruptibleSleep(std::chrono::milliseconds{num_sleep});
+    for (const auto& num_sleep : {0ms, 1ms}) {
+        UninterruptibleSleep(num_sleep);
         BOOST_CHECK_EQUAL(111, GetTime()); // Deprecated time getter
         BOOST_CHECK_EQUAL(111, GetTime<std::chrono::seconds>().count());
         BOOST_CHECK_EQUAL(111000, GetTime<std::chrono::milliseconds>().count());
         BOOST_CHECK_EQUAL(111000000, GetTime<std::chrono::microseconds>().count());
     }
 
     SetMockTime(0);
-    // Check that system time changes after a sleep
+    // Check that steady time and system time changes after a sleep
+    const auto steady_ms_0 = Now<SteadyMilliseconds>();
+    const auto steady_0 = std::chrono::steady_clock::now();
     const auto ms_0 = GetTime<std::chrono::milliseconds>();
     const auto us_0 = GetTime<std::chrono::microseconds>();
-    UninterruptibleSleep(std::chrono::milliseconds{1});
+    UninterruptibleSleep(1ms);
+    BOOST_CHECK(steady_ms_0 < Now<SteadyMilliseconds>());
+    BOOST_CHECK(steady_0 + 1ms <= std::chrono::steady_clock::now());
     BOOST_CHECK(ms_0 < GetTime<std::chrono::milliseconds>());
     BOOST_CHECK(us_0 < GetTime<std::chrono::microseconds>());
 }

src/util/time.h

@@ -14,6 +14,10 @@
 
 using namespace std::chrono_literals;
 
+using SteadySeconds = std::chrono::time_point<std::chrono::steady_clock, std::chrono::seconds>;
+using SteadyMilliseconds = std::chrono::time_point<std::chrono::steady_clock, std::chrono::milliseconds>;
+using SteadyMicroseconds = std::chrono::time_point<std::chrono::steady_clock, std::chrono::microseconds>;
+
 void UninterruptibleSleep(const std::chrono::microseconds& n);
 
 /**
@@ -67,6 +71,15 @@ std::chrono::seconds GetMockTime();
 /** Return system time (or mocked time, if set) */
 template <typename T>
 T GetTime();
+/**
+ * Return the current time point cast to the given precicion. Only use this
+ * when an exact precicion is needed, otherwise use T::clock::now() directly.
+ */
+template <typename T>
+T Now()
+{
+    return std::chrono::time_point_cast<typename T::duration>(T::clock::now());
+}
 
 /**
  * ISO 8601 formatting is preferred. Use the FormatISO8601{DateTime,Date}