libmdbx added as set of files

1 files changed, 129 insertions, 0 deletions

diff --git a/plugins/Dbx_mdbx/src/libmdbx/test/chrono.cc b/plugins/Dbx_mdbx/src/libmdbx/test/chrono.cc
new file mode 100644
index 0000000000..b6245295e7
--- /dev/null
+++ b/plugins/Dbx_mdbx/src/libmdbx/test/chrono.cc
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2017 Leonid Yuriev <leo@yuriev.ru>
+ * and other libmdbx authors: please see AUTHORS file.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#include "test.h"
+
+namespace chrono {
+
+#define NSEC_PER_SEC 1000000000u
+uint32_t ns2fractional(uint32_t ns) {
+  assert(ns < NSEC_PER_SEC);
+  /* LY: здесь и далее используется "длинное деление", которое
+   * для ясности кода оставлено как есть (без ручной оптимизации). Так как
+   * GCC, Clang и даже MSVC сами давно умеют конвертировать деление на
+   * константу в быструю reciprocal-форму. */
+  return ((uint64_t)ns << 32) / NSEC_PER_SEC;
+}
+
+uint32_t fractional2ns(uint32_t fractional) {
+  return (fractional * (uint64_t)NSEC_PER_SEC) >> 32;
+}
+
+#define USEC_PER_SEC 1000000u
+uint32_t us2fractional(uint32_t us) {
+  assert(us < USEC_PER_SEC);
+  return ((uint64_t)us << 32) / USEC_PER_SEC;
+}
+
+uint32_t fractional2us(uint32_t fractional) {
+  return (fractional * (uint64_t)USEC_PER_SEC) >> 32;
+}
+
+#define MSEC_PER_SEC 1000u
+uint32_t ms2fractional(uint32_t ms) {
+  assert(ms < MSEC_PER_SEC);
+  return ((uint64_t)ms << 32) / MSEC_PER_SEC;
+}
+
+uint32_t fractional2ms(uint32_t fractional) {
+  return (fractional * (uint64_t)MSEC_PER_SEC) >> 32;
+}
+
+time from_ns(uint64_t ns) {
+  time result;
+  result.fixedpoint = ((ns / NSEC_PER_SEC) << 32) |
+                      ns2fractional((uint32_t)(ns % NSEC_PER_SEC));
+  return result;
+}
+
+time from_us(uint64_t us) {
+  time result;
+  result.fixedpoint = ((us / USEC_PER_SEC) << 32) |
+                      us2fractional((uint32_t)(us % USEC_PER_SEC));
+  return result;
+}
+
+time from_ms(uint64_t ms) {
+  time result;
+  result.fixedpoint = ((ms / MSEC_PER_SEC) << 32) |
+                      ms2fractional((uint32_t)(ms % MSEC_PER_SEC));
+  return result;
+}
+
+time now_realtime() {
+#if defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS)
+  static void(WINAPI * query_time)(LPFILETIME);
+  if (!query_time) {
+    query_time = (void(WINAPI *)(LPFILETIME))GetProcAddress(
+        GetModuleHandle(TEXT("kernel32.dll")),
+        "GetSystemTimePreciseAsFileTime");
+    if (!query_time)
+      query_time = GetSystemTimeAsFileTime;
+  }
+
+  FILETIME filetime;
+  query_time(&filetime);
+  uint64_t ns100 =
+      (uint64_t)filetime.dwHighDateTime << 32 | filetime.dwLowDateTime;
+  return from_ns((ns100 - UINT64_C(116444736000000000)) * 100u);
+#else
+  struct timespec ts;
+  if (unlikely(clock_gettime(CLOCK_REALTIME, &ts)))
+    failure_perror("clock_gettime(CLOCK_REALTIME", errno);
+
+  return from_timespec(ts);
+#endif
+}
+
+time now_motonic() {
+#if defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS)
+  static uint64_t reciprocal;
+  static LARGE_INTEGER Frequency;
+  if (reciprocal == 0) {
+    if (!QueryPerformanceFrequency(&Frequency))
+      failure_perror("QueryPerformanceFrequency()", GetLastError());
+    reciprocal = (((UINT64_C(1) << 48) + Frequency.QuadPart / 2 + 1) /
+                  Frequency.QuadPart);
+    assert(reciprocal);
+  }
+
+  LARGE_INTEGER Counter;
+  if (!QueryPerformanceCounter(&Counter))
+    failure_perror("QueryPerformanceCounter()", GetLastError());
+
+  time result;
+  result.fixedpoint = (Counter.QuadPart / Frequency.QuadPart) << 32;
+  uint64_t mod = Counter.QuadPart % Frequency.QuadPart;
+  result.fixedpoint += (mod * reciprocal) >> 16;
+  return result;
+#else
+  struct timespec ts;
+  if (unlikely(clock_gettime(CLOCK_MONOTONIC, &ts)))
+    failure_perror("clock_gettime(CLOCK_MONOTONIC)", errno);
+
+  return from_timespec(ts);
+#endif
+}
+
+} /* namespace chrono */