From 354bb40e75d94466e91fe6960523612c9d17ccfb Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 2 Nov 2017 23:11:29 +0300
Subject: Add implementation

---
 mysql/mysys/my_getsystime.c | 122 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 mysql/mysys/my_getsystime.c

(limited to 'mysql/mysys/my_getsystime.c')

diff --git a/mysql/mysys/my_getsystime.c b/mysql/mysys/my_getsystime.c
new file mode 100644
index 0000000..3007c4e
--- /dev/null
+++ b/mysql/mysys/my_getsystime.c
@@ -0,0 +1,122 @@
+/* Copyright (c) 2004, 2014, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
+
+/* get time since epoc in 100 nanosec units */
+/* thus to get the current time we should use the system function
+   with the highest possible resolution */
+
+#include "mysys_priv.h"
+#include "my_static.h"
+
+#if HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+/**
+  Get high-resolution time.
+
+  @remark For windows platforms we need the frequency value of
+          the CPU. This is initialized in my_init.c through
+          QueryPerformanceFrequency(). If the Windows platform
+          doesn't support QueryPerformanceFrequency(), zero is
+          returned.
+
+  @retval current high-resolution time.
+*/
+
+ulonglong my_getsystime()
+{
+#ifdef HAVE_CLOCK_GETTIME
+  struct timespec tp;
+  clock_gettime(CLOCK_REALTIME, &tp);
+  return (ulonglong)tp.tv_sec*10000000+(ulonglong)tp.tv_nsec/100;
+#elif defined(_WIN32)
+  LARGE_INTEGER t_cnt;
+  if (query_performance_frequency)
+  {
+    QueryPerformanceCounter(&t_cnt);
+    return ((t_cnt.QuadPart / query_performance_frequency * 10000000) +
+            ((t_cnt.QuadPart % query_performance_frequency) * 10000000 /
+             query_performance_frequency) + query_performance_offset);
+  }
+  return 0;
+#else
+  /* TODO: check for other possibilities for hi-res timestamping */
+  struct timeval tv;
+  gettimeofday(&tv,NULL);
+  return (ulonglong)tv.tv_sec*10000000+(ulonglong)tv.tv_usec*10;
+#endif
+}
+
+
+/**
+  Return current time.
+
+  @param  flags   If MY_WME is set, write error if time call fails.
+
+  @retval current time.
+*/
+
+time_t my_time(myf flags)
+{
+  time_t t;
+  /*
+    The following loop is here beacuse time() may fail on some systems.
+    We're using a hardcoded my_message_stderr() here rather than going
+    through the hook in my_message_local() because it's far too easy to
+    come full circle with any logging function that writes timestamps ...
+  */
+  while ((t= time(0)) == (time_t) -1)
+  {
+    if (flags & MY_WME)
+      my_message_stderr(0, "time() call failed", MYF(0));
+  }
+  return t;
+}
+
+
+#define OFFSET_TO_EPOCH 116444736000000000ULL
+
+/**
+  Return time in microseconds.
+
+  @remark This function is to be used to measure performance in
+          micro seconds. As it's not defined whats the start time
+          for the clock, this function us only useful to measure
+          time between two moments.
+
+  @retval Value in microseconds from some undefined point in time.
+*/
+
+ulonglong my_micro_time()
+{
+#ifdef _WIN32
+  ulonglong newtime;
+  GetSystemTimeAsFileTime((FILETIME*)&newtime);
+  newtime-= OFFSET_TO_EPOCH;
+  return (newtime/10);
+#else
+  ulonglong newtime;
+  struct timeval t;
+  /*
+    The following loop is here because gettimeofday may fail on some systems
+  */
+  while (gettimeofday(&t, NULL) != 0)
+  {}
+  newtime= (ulonglong)t.tv_sec * 1000000 + t.tv_usec;
+  return newtime;
+#endif
+}
+
-- 
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