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146 lines
4.3 KiB
C
146 lines
4.3 KiB
C
/* Copyright (c) 2004, 2011, Oracle and/or its affiliates.
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Copyright (c) 2009-2011 Monty Program Ab
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
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#include "mysys_priv.h"
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#include "my_static.h"
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#ifdef _WIN32
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#define OFFSET_TO_EPOC 116444736000000000LL
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static ulonglong query_performance_frequency;
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#endif
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#ifdef HAVE_LINUX_UNISTD_H
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#include <linux/unistd.h>
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#endif
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/* For CYGWIN */
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#if !defined(CLOCK_THREAD_CPUTIME_ID) && defined(CLOCK_THREAD_CPUTIME)
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#define CLOCK_THREAD_CPUTIME_ID CLOCK_THREAD_CPUTIME
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#endif
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/*
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return number of nanoseconds since unspecified (but always the same)
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point in the past
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NOTE:
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Thus to get the current time we should use the system function
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with the highest possible resolution
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The value is not anchored to any specific point in time (e.g. epoch) nor
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is it subject to resetting or drifting by way of adjtime() or settimeofday(),
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and thus it is *NOT* appropriate for getting the current timestamp. It can be
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used for calculating time intervals, though.
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*/
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ulonglong my_interval_timer()
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{
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#ifdef HAVE_CLOCK_GETTIME
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struct timespec tp;
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clock_gettime(CLOCK_MONOTONIC, &tp);
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return tp.tv_sec*1000000000ULL+tp.tv_nsec;
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#elif defined(HAVE_GETHRTIME)
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return gethrtime();
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#elif defined(_WIN32)
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DBUG_ASSERT(query_performance_frequency);
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LARGE_INTEGER t_cnt;
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QueryPerformanceCounter(&t_cnt);
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return (t_cnt.QuadPart / query_performance_frequency * 1000000000ULL) +
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((t_cnt.QuadPart % query_performance_frequency) * 1000000000ULL /
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query_performance_frequency);
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#else
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/* TODO: check for other possibilities for hi-res timestamping */
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struct timeval tv;
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gettimeofday(&tv,NULL);
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return tv.tv_sec*1000000000ULL+tv.tv_usec*1000ULL;
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#endif
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}
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/* Return current time in HRTIME_RESOLUTION (microseconds) since epoch */
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my_hrtime_t my_hrtime()
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{
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my_hrtime_t hrtime;
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#if defined(_WIN32)
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ulonglong newtime;
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GetSystemTimePreciseAsFileTime((FILETIME*)&newtime);
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hrtime.val= (newtime - OFFSET_TO_EPOC)/10;
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#elif defined(HAVE_CLOCK_GETTIME)
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struct timespec tp;
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clock_gettime(CLOCK_REALTIME, &tp);
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hrtime.val= tp.tv_sec*1000000ULL+tp.tv_nsec/1000ULL;
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#else
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struct timeval t;
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/* The following loop is here because gettimeofday may fail */
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while (gettimeofday(&t, NULL) != 0) {}
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hrtime.val= t.tv_sec*1000000ULL + t.tv_usec;
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#endif
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DBUG_EXECUTE_IF("system_time_plus_one_hour", hrtime.val += 3600*1000000ULL;);
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DBUG_EXECUTE_IF("system_time_minus_one_hour", hrtime.val -= 3600*1000000ULL;);
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return hrtime;
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}
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#ifdef _WIN32
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/*
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Low accuracy, "coarse" timer.
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Has lower latency than my_hrtime(). Used in situations, where microsecond
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precision is not needed, e.g in Windows pthread_cond_timedwait, where POSIX
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interface needs nanoseconds, yet the underlying Windows function only
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accepts millisecons.
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*/
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my_hrtime_t my_hrtime_coarse()
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{
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my_hrtime_t hrtime;
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ulonglong t;
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GetSystemTimeAsFileTime((FILETIME*)&t);
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hrtime.val= (t - OFFSET_TO_EPOC)/10;
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return hrtime;
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}
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#endif
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void my_time_init()
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{
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#ifdef _WIN32
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compile_time_assert(sizeof(LARGE_INTEGER) ==
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sizeof(query_performance_frequency));
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QueryPerformanceFrequency((LARGE_INTEGER *)&query_performance_frequency);
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DBUG_ASSERT(query_performance_frequency);
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#endif
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}
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/*
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Return cpu time in 1/10th on a microsecond (1e-7 s)
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*/
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ulonglong my_getcputime()
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{
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#ifdef CLOCK_THREAD_CPUTIME_ID
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struct timespec tp;
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if (clock_gettime(CLOCK_THREAD_CPUTIME_ID, &tp))
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return 0;
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return (ulonglong)tp.tv_sec*10000000+(ulonglong)tp.tv_nsec/100;
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#elif defined(__NR_clock_gettime)
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struct timespec tp;
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if (syscall(__NR_clock_gettime, CLOCK_THREAD_CPUTIME_ID, &tp))
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return 0;
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return (ulonglong)tp.tv_sec*10000000+(ulonglong)tp.tv_nsec/100;
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#endif /* CLOCK_THREAD_CPUTIME_ID */
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return 0;
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}
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