time providers in separated library for future refactoring

1 files changed, 31 insertions, 0 deletions

diff --git a/library/cpp/time_provider/monotonic.cpp b/library/cpp/time_provider/monotonic.cpp
new file mode 100644
index 0000000000..99126080e2
--- /dev/null
+++ b/library/cpp/time_provider/monotonic.cpp
@@ -0,0 +1,31 @@
+#include "monotonic.h"
+
+#include <chrono>
+
+namespace NMonotonic {
+
+namespace {
+// Unfortunately time_since_epoch() is sometimes negative on wine
+// Remember initial time point at program start and use offsets from that
+std::chrono::steady_clock::time_point MonotonicOffset = std::chrono::steady_clock::now();
+}
+
+ui64 GetMonotonicMicroSeconds() {
+    auto microseconds = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::steady_clock::now() - MonotonicOffset).count();
+    // Steady clock is supposed to never jump backwards, but it's better to be safe in case of buggy implementations
+    if (Y_UNLIKELY(microseconds < 0)) {
+        microseconds = 0;
+    }
+    // Add one so we never return zero
+    return microseconds + 1;
+}
+
+} // namespace TMonotonic
+
+template<>
+void Out<NMonotonic::TMonotonic>(
+    IOutputStream& o,
+    NMonotonic::TMonotonic t)
+{
+    o << t - NMonotonic::TMonotonic::Zero();
+}