diff options
author | Xanadu <none@none> | 2010-07-20 02:49:28 +0200 |
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committer | Xanadu <none@none> | 2010-07-20 02:49:28 +0200 |
commit | 79622802f397258ee0f34327ba3ae6977ca3e7ff (patch) | |
tree | 1868946c234ab9ee256a6b7766a15713eae94235 /externals/mysql/mysys/my_getsystime.c | |
parent | 7dd2dc91816ab8b3bc3b99a1b1c99c7ea314d5a8 (diff) | |
parent | f906976837502fa5aa81b982b901d1509f5aa0c4 (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
Diffstat (limited to 'externals/mysql/mysys/my_getsystime.c')
-rw-r--r-- | externals/mysql/mysys/my_getsystime.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/externals/mysql/mysys/my_getsystime.c b/externals/mysql/mysys/my_getsystime.c new file mode 100644 index 00000000000..46e0c5469e4 --- /dev/null +++ b/externals/mysql/mysys/my_getsystime.c @@ -0,0 +1,225 @@ +/* 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__) */ +} + |