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- /* Copyright (c) 2004, 2021, Oracle and/or its affiliates.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License, version 2.0,
- as published by the Free Software Foundation.
-
- This program is also distributed with certain software (including
- but not limited to OpenSSL) that is licensed under separate terms,
- as designated in a particular file or component or in included license
- documentation. The authors of MySQL hereby grant you an additional
- permission to link the program and your derivative works with the
- separately licensed software that they have included with MySQL.
-
- Without limiting anything contained in the foregoing, this file,
- which is part of C Driver for MySQL (Connector/C), is also subject to the
- Universal FOSS Exception, version 1.0, a copy of which can be found at
- http://oss.oracle.com/licenses/universal-foss-exception.
-
- 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, version 2.0, 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
-
- #if defined(_WIN32)
- #include "my_sys.h" /* for my_printf_error */
- typedef VOID(WINAPI *time_fn)(LPFILETIME);
- static time_fn my_get_system_time_as_file_time= GetSystemTimeAsFileTime;
-
- /**
- Initialise highest available time resolution API on Windows
- @return Initialization result
- @retval FALSE Success
- @retval TRUE Error. Couldn't initialize environment
- */
- my_bool win_init_get_system_time_as_file_time()
- {
- DWORD error;
- HMODULE h;
- h= LoadLibrary("kernel32.dll");
- if (h != NULL)
- {
- time_fn pfn= (time_fn) GetProcAddress(h, "GetSystemTimePreciseAsFileTime");
- if (pfn)
- my_get_system_time_as_file_time= pfn;
-
- return FALSE;
- }
-
- error= GetLastError();
- my_printf_error(0,
- "LoadLibrary(\"kernel32.dll\") failed: GetLastError returns %lu",
- MYF(0),
- error);
-
- return TRUE;
- }
- #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.
-
- @retval Number of microseconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC)
- */
-
- ulonglong my_micro_time()
- {
- #ifdef _WIN32
- ulonglong newtime;
- my_get_system_time_as_file_time((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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