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authorXanadu <none@none>2010-07-20 02:49:28 +0200
committerXanadu <none@none>2010-07-20 02:49:28 +0200
commit79622802f397258ee0f34327ba3ae6977ca3e7ff (patch)
tree1868946c234ab9ee256a6b7766a15713eae94235 /externals/mysql/mysys/my_getsystime.c
parent7dd2dc91816ab8b3bc3b99a1b1c99c7ea314d5a8 (diff)
parentf906976837502fa5aa81b982b901d1509f5aa0c4 (diff)
Merge. Revision history for source files should be all back now.
--HG-- branch : trunk rename : sql/CMakeLists.txt => sql/tools/CMakeLists.txt rename : src/server/game/Pools/PoolHandler.cpp => src/server/game/Pools/PoolMgr.cpp rename : src/server/game/Pools/PoolHandler.h => src/server/game/Pools/PoolMgr.h rename : src/server/game/PrecompiledHeaders/NixCorePCH.cpp => src/server/game/PrecompiledHeaders/gamePCH.cpp rename : src/server/game/PrecompiledHeaders/NixCorePCH.h => src/server/game/PrecompiledHeaders/gamePCH.h
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diff --git a/externals/mysql/mysys/my_getsystime.c b/externals/mysql/mysys/my_getsystime.c
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+/* Copyright (C) 2004 MySQL AB
+
+ 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 */
+
+/*
+ TODO: in functions my_micro_time() and my_micro_time_and_time() there
+ exists some common code that should be merged into a function.
+*/
+
+#include "mysys_priv.h"
+#include "my_static.h"
+
+#ifdef __NETWARE__
+#include <nks/time.h>
+#endif
+
+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(__WIN__)
+ 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;
+#elif defined(__NETWARE__)
+ NXTime_t tm;
+ NXGetTime(NX_SINCE_1970, NX_NSECONDS, &tm);
+ return (ulonglong)tm/100;
+#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
+
+ SYNOPSIS
+ my_time()
+ flags If MY_WME is set, write error if time call fails
+
+*/
+
+time_t my_time(myf flags __attribute__((unused)))
+{
+ time_t t;
+#ifdef HAVE_GETHRTIME
+ (void) my_micro_time_and_time(&t);
+ return t;
+#else
+ /* The following loop is here beacuse time() may fail on some systems */
+ while ((t= time(0)) == (time_t) -1)
+ {
+ if (flags & MY_WME)
+ fprintf(stderr, "%s: Warning: time() call failed\n", my_progname);
+ }
+ return t;
+#endif
+}
+
+
+/*
+ Return time in micro seconds
+
+ SYNOPSIS
+ my_micro_time()
+
+ NOTES
+ 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.
+
+ For windows platforms we need the frequency value of the CUP. This is
+ initalized in my_init.c through QueryPerformanceFrequency().
+
+ If Windows platform doesn't support QueryPerformanceFrequency() we will
+ obtain the time via GetClockCount, which only supports milliseconds.
+
+ RETURN
+ Value in microseconds from some undefined point in time
+*/
+
+ulonglong my_micro_time()
+{
+#if defined(__WIN__)
+ ulonglong newtime;
+ GetSystemTimeAsFileTime((FILETIME*)&newtime);
+ return (newtime/10);
+#elif defined(HAVE_GETHRTIME)
+ return gethrtime()/1000;
+#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 /* defined(__WIN__) */
+}
+
+
+/*
+ Return time in seconds and timer in microseconds (not different start!)
+
+ SYNOPSIS
+ my_micro_time_and_time()
+ time_arg Will be set to seconds since epoch (00:00:00 UTC,
+ January 1, 1970)
+
+ NOTES
+ This function is to be useful when we need both the time and microtime.
+ For example in MySQL this is used to get the query time start of a query
+ and to measure the time of a query (for the slow query log)
+
+ IMPLEMENTATION
+ Value of time is as in time() call.
+ Value of microtime is same as my_micro_time(), which may be totally
+ unrealated to time()
+
+ RETURN
+ Value in microseconds from some undefined point in time
+*/
+
+#define DELTA_FOR_SECONDS 500000000LL /* Half a second */
+
+ulonglong my_micro_time_and_time(time_t *time_arg)
+{
+#if defined(__WIN__)
+ ulonglong newtime;
+ GetSystemTimeAsFileTime((FILETIME*)&newtime);
+ *time_arg= (time_t) ((newtime - OFFSET_TO_EPOCH) / 10000000);
+ return (newtime/10);
+#elif defined(HAVE_GETHRTIME)
+ /*
+ Solaris has a very slow time() call. We optimize this by using the very
+ fast gethrtime() call and only calling time() every 1/2 second
+ */
+ static hrtime_t prev_gethrtime= 0;
+ static time_t cur_time= 0;
+ hrtime_t cur_gethrtime;
+
+ pthread_mutex_lock(&THR_LOCK_time);
+ cur_gethrtime= gethrtime();
+ if ((cur_gethrtime - prev_gethrtime) > DELTA_FOR_SECONDS)
+ {
+ cur_time= time(0);
+ prev_gethrtime= cur_gethrtime;
+ }
+ *time_arg= cur_time;
+ pthread_mutex_unlock(&THR_LOCK_time);
+ return cur_gethrtime/1000;
+#else
+ ulonglong newtime;
+ struct timeval t;
+ /*
+ The following loop is here because gettimeofday may fail on some systems
+ */
+ while (gettimeofday(&t, NULL) != 0)
+ {}
+ *time_arg= t.tv_sec;
+ newtime= (ulonglong)t.tv_sec * 1000000 + t.tv_usec;
+ return newtime;
+#endif /* defined(__WIN__) */
+}
+
+
+/*
+ Returns current time
+
+ SYNOPSIS
+ my_time_possible_from_micro()
+ microtime Value from very recent my_micro_time()
+
+ NOTES
+ This function returns the current time. The microtime argument is only used
+ if my_micro_time() uses a function that can safely be converted to the
+ current time.
+
+ RETURN
+ current time
+*/
+
+time_t my_time_possible_from_micro(ulonglong microtime __attribute__((unused)))
+{
+#if defined(__WIN__)
+ time_t t;
+ while ((t= time(0)) == (time_t) -1)
+ {}
+ return t;
+#elif defined(HAVE_GETHRTIME)
+ return my_time(0); /* Cached time */
+#else
+ return (time_t) (microtime / 1000000);
+#endif /* defined(__WIN__) */
+}
+