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mariadb/mysys/my_init.c
Davi Arnaut 7bee52da46 Bug#42054: SELECT CURDATE() is returning bad value 
The problem from a user point of view was that on Solaris the
time related functions (e.g. NOW(), SYSDATE(), etc) would always
return a fixed time.

This bug was happening due to a logic in the time retrieving
wrapper function which would only call the time() function every
half second. This interval between calls would be calculated
using the gethrtime() and the logic relied on the fact that time
returned by it is monotonic.

Unfortunately, due to bugs in the gethrtime() implementation,
there are some cases where the time returned by it can drift
(See Solaris bug id 6600939), potentially causing the interval
calculation logic to fail.

Since newer versions of Solaris (10+) have alleviated the
performance degradation associated with time(2), the solution is
to simply directly rely on time() at each invocation.

This simplification has an upside that it allows us to eliminate
a lock which was used to control access to the variables used
to track the half second interval, thus improving the overall
scalability of timekeeping related functions (e.g. NOW()).

Benchmarks runs have shown no significant degradation associated
with this change. With this, there are actually improvements in
performance for cases involving many connections.

In summary, the changes introduced by this patch are:

a) my_time() and my_micro_time_and_time() no longer use gethrtime().
   Instead, time() and gettimeofdate() are used correspondingly.

b) my_micro_time() is changed to not use gethrtime() so as to
   have the same time source as my_micro_time_and_time().
   There shouldn't be any performance impact from this change
   since this function is used only a few times during statement
   execution and, on Solaris, gettimeofday() shows acceptable
   performance.
2011-01-12 18:36:39 -02:00

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/* Copyright (C) 2000-2003 MySQL AB, 2008-2009 Sun Microsystems, Inc
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 */
#include "mysys_priv.h"
#include "my_static.h"
#include "mysys_err.h"
#include <m_string.h>
#include <m_ctype.h>
#include <signal.h>
#ifdef __WIN__
#ifdef _MSC_VER
#include <locale.h>
#include <crtdbg.h>
/* WSAStartup needs winsock library*/
#pragma comment(lib, "ws2_32")
#endif
my_bool have_tcpip=0;
static void my_win_init(void);
static my_bool win32_init_tcp_ip();
#else
#define my_win_init()
#endif
#define SCALE_SEC 100
#define SCALE_USEC 10000
my_bool my_init_done= 0;
/** True if @c my_basic_init() has been called. */
my_bool my_basic_init_done= 0;
uint mysys_usage_id= 0; /* Incremented for each my_init() */
ulong my_thread_stack_size= 65536;
static ulong atoi_octal(const char *str)
{
long int tmp;
while (*str && my_isspace(&my_charset_latin1, *str))
str++;
str2int(str,
(*str == '0' ? 8 : 10), /* Octalt or decimalt */
0, INT_MAX, &tmp);
return (ulong) tmp;
}
MYSQL_FILE *mysql_stdin= NULL;
static MYSQL_FILE instrumented_stdin;
/**
Perform a limited initialisation of mysys.
This initialisation is sufficient to:
- allocate memory,
- read configuration files,
- parse command lines arguments.
To complete the mysys initialisation,
call my_init().
@return 0 on success
*/
my_bool my_basic_init(void)
{
char * str;
if (my_basic_init_done)
return 0;
my_basic_init_done= 1;
mysys_usage_id++;
my_umask= 0660; /* Default umask for new files */
my_umask_dir= 0700; /* Default umask for new directories */
/* Default creation of new files */
if ((str= getenv("UMASK")) != 0)
my_umask= (int) (atoi_octal(str) | 0600);
/* Default creation of new dir's */
if ((str= getenv("UMASK_DIR")) != 0)
my_umask_dir= (int) (atoi_octal(str) | 0700);
init_glob_errs();
instrumented_stdin.m_file= stdin;
instrumented_stdin.m_psi= NULL; /* not yet instrumented */
mysql_stdin= & instrumented_stdin;
if (my_thread_global_init())
return 1;
#if defined(SAFE_MUTEX)
safe_mutex_global_init(); /* Must be called early */
#endif
#if defined(MY_PTHREAD_FASTMUTEX) && !defined(SAFE_MUTEX)
fastmutex_global_init(); /* Must be called early */
#endif
#if defined(HAVE_PTHREAD_INIT)
pthread_init(); /* Must be called before DBUG_ENTER */
#endif
if (my_thread_basic_global_init())
return 1;
/* $HOME is needed early to parse configuration files located in ~/ */
if ((home_dir= getenv("HOME")) != 0)
home_dir= intern_filename(home_dir_buff, home_dir);
return 0;
}
/*
Init my_sys functions and my_sys variabels
SYNOPSIS
my_init()
RETURN
0 ok
1 Couldn't initialize environment
*/
my_bool my_init(void)
{
if (my_init_done)
return 0;
my_init_done= 1;
if (my_basic_init())
return 1;
if (my_thread_global_init())
return 1;
{
DBUG_ENTER("my_init");
DBUG_PROCESS((char*) (my_progname ? my_progname : "unknown"));
my_win_init();
DBUG_PRINT("exit", ("home: '%s'", home_dir));
#ifdef __WIN__
win32_init_tcp_ip();
#endif
DBUG_RETURN(0);
}
} /* my_init */
/* End my_sys */
void my_end(int infoflag)
{
/*
this code is suboptimal to workaround a bug in
Sun CC: Sun C++ 5.6 2004/06/02 for x86, and should not be
optimized until this compiler is not in use anymore
*/
FILE *info_file= DBUG_FILE;
my_bool print_info= (info_file != stderr);
if (!my_init_done)
return;
/*
We do not use DBUG_ENTER here, as after cleanup DBUG is no longer
operational, so we cannot use DBUG_RETURN.
*/
DBUG_PRINT("info",("Shutting down: infoflag: %d print_info: %d",
infoflag, print_info));
if (!info_file)
{
info_file= stderr;
print_info= 0;
}
if ((infoflag & MY_CHECK_ERROR) || print_info)
{ /* Test if some file is left open */
if (my_file_opened | my_stream_opened)
{
char ebuff[512];
my_snprintf(ebuff, sizeof(ebuff), EE(EE_OPEN_WARNING),
my_file_opened, my_stream_opened);
my_message_stderr(EE_OPEN_WARNING, ebuff, ME_BELL);
DBUG_PRINT("error", ("%s", ebuff));
my_print_open_files();
}
}
free_charsets();
my_error_unregister_all();
my_once_free();
if ((infoflag & MY_GIVE_INFO) || print_info)
{
#ifdef HAVE_GETRUSAGE
struct rusage rus;
#ifdef HAVE_purify
/* Purify assumes that rus is uninitialized after getrusage call */
bzero((char*) &rus, sizeof(rus));
#endif
if (!getrusage(RUSAGE_SELF, &rus))
fprintf(info_file,"\n\
User time %.2f, System time %.2f\n\
Maximum resident set size %ld, Integral resident set size %ld\n\
Non-physical pagefaults %ld, Physical pagefaults %ld, Swaps %ld\n\
Blocks in %ld out %ld, Messages in %ld out %ld, Signals %ld\n\
Voluntary context switches %ld, Involuntary context switches %ld\n",
(rus.ru_utime.tv_sec * SCALE_SEC +
rus.ru_utime.tv_usec / SCALE_USEC) / 100.0,
(rus.ru_stime.tv_sec * SCALE_SEC +
rus.ru_stime.tv_usec / SCALE_USEC) / 100.0,
rus.ru_maxrss, rus.ru_idrss,
rus.ru_minflt, rus.ru_majflt,
rus.ru_nswap, rus.ru_inblock, rus.ru_oublock,
rus.ru_msgsnd, rus.ru_msgrcv, rus.ru_nsignals,
rus.ru_nvcsw, rus.ru_nivcsw);
#endif
#if defined(__WIN__) && defined(_MSC_VER)
_CrtSetReportMode( _CRT_WARN, _CRTDBG_MODE_FILE );
_CrtSetReportFile( _CRT_WARN, _CRTDBG_FILE_STDERR );
_CrtSetReportMode( _CRT_ERROR, _CRTDBG_MODE_FILE );
_CrtSetReportFile( _CRT_ERROR, _CRTDBG_FILE_STDERR );
_CrtSetReportMode( _CRT_ASSERT, _CRTDBG_MODE_FILE );
_CrtSetReportFile( _CRT_ASSERT, _CRTDBG_FILE_STDERR );
_CrtCheckMemory();
_CrtDumpMemoryLeaks();
#endif
}
if (!(infoflag & MY_DONT_FREE_DBUG))
{
DBUG_END(); /* Must be done before my_thread_end */
}
my_thread_end();
my_thread_global_end();
#if defined(SAFE_MUTEX)
/*
Check on destroying of mutexes. A few may be left that will get cleaned
up by C++ destructors
*/
safe_mutex_end((infoflag & (MY_GIVE_INFO | MY_CHECK_ERROR)) ? stderr :
(FILE *) 0);
#endif /* defined(SAFE_MUTEX) */
#ifdef __WIN__
if (have_tcpip)
WSACleanup();
#endif /* __WIN__ */
my_init_done=0;
my_basic_init_done= 0;
} /* my_end */
#ifdef __WIN__
/*
my_parameter_handler
Invalid parameter handler we will use instead of the one "baked"
into the CRT for MSC v8. This one just prints out what invalid
parameter was encountered. By providing this routine, routines like
lseek will return -1 when we expect them to instead of crash.
*/
void my_parameter_handler(const wchar_t * expression, const wchar_t * function,
const wchar_t * file, unsigned int line,
uintptr_t pReserved)
{
DBUG_PRINT("my",("Expression: %s function: %s file: %s, line: %d",
expression, function, file, line));
}
#ifdef __MSVC_RUNTIME_CHECKS
#include <rtcapi.h>
/* Turn off runtime checks for 'handle_rtc_failure' */
#pragma runtime_checks("", off)
/*
handle_rtc_failure
Catch the RTC error and dump it to stderr
*/
int handle_rtc_failure(int err_type, const char *file, int line,
const char* module, const char *format, ...)
{
va_list args;
va_start(args, format);
fprintf(stderr, "Error:");
vfprintf(stderr, format, args);
fprintf(stderr, " At %s:%d\n", file, line);
va_end(args);
(void) fflush(stderr);
return 0; /* Error is handled */
}
#pragma runtime_checks("", restore)
#endif
#define OFFSET_TO_EPOC ((__int64) 134774 * 24 * 60 * 60 * 1000 * 1000 * 10)
#define MS 10000000
static void win_init_time(void)
{
/* The following is used by time functions */
FILETIME ft;
LARGE_INTEGER li, t_cnt;
DBUG_ASSERT(sizeof(LARGE_INTEGER) == sizeof(query_performance_frequency));
if (QueryPerformanceFrequency((LARGE_INTEGER *)&query_performance_frequency) == 0)
query_performance_frequency= 0;
else
{
GetSystemTimeAsFileTime(&ft);
li.LowPart= ft.dwLowDateTime;
li.HighPart= ft.dwHighDateTime;
query_performance_offset= li.QuadPart-OFFSET_TO_EPOC;
QueryPerformanceCounter(&t_cnt);
query_performance_offset-= (t_cnt.QuadPart /
query_performance_frequency * MS +
t_cnt.QuadPart %
query_performance_frequency * MS /
query_performance_frequency);
}
}
/*
Open HKEY_LOCAL_MACHINE\SOFTWARE\MySQL and set any strings found
there as environment variables
*/
static void win_init_registry(void)
{
HKEY key_handle;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, (LPCTSTR)"SOFTWARE\\MySQL",
0, KEY_READ, &key_handle) == ERROR_SUCCESS)
{
LONG ret;
DWORD index= 0;
DWORD type;
char key_name[256], key_data[1024];
DWORD key_name_len= sizeof(key_name) - 1;
DWORD key_data_len= sizeof(key_data) - 1;
while ((ret= RegEnumValue(key_handle, index++,
key_name, &key_name_len,
NULL, &type, (LPBYTE)&key_data,
&key_data_len)) != ERROR_NO_MORE_ITEMS)
{
char env_string[sizeof(key_name) + sizeof(key_data) + 2];
if (ret == ERROR_MORE_DATA)
{
/* Registry value larger than 'key_data', skip it */
DBUG_PRINT("error", ("Skipped registry value that was too large"));
}
else if (ret == ERROR_SUCCESS)
{
if (type == REG_SZ)
{
strxmov(env_string, key_name, "=", key_data, NullS);
/* variable for putenv must be allocated ! */
putenv(strdup(env_string)) ;
}
}
else
{
/* Unhandled error, break out of loop */
break;
}
key_name_len= sizeof(key_name) - 1;
key_data_len= sizeof(key_data) - 1;
}
RegCloseKey(key_handle);
}
}
static void my_win_init(void)
{
DBUG_ENTER("my_win_init");
#if defined(_MSC_VER)
#if _MSC_VER < 1300
/*
Clear the OS system variable TZ and avoid the 100% CPU usage
Only for old versions of Visual C++
*/
_putenv("TZ=");
#endif
#if _MSC_VER >= 1400
/* this is required to make crt functions return -1 appropriately */
_set_invalid_parameter_handler(my_parameter_handler);
#endif
#endif
#ifdef __MSVC_RUNTIME_CHECKS
/*
Install handler to send RTC (Runtime Error Check) warnings
to log file
*/
_RTC_SetErrorFunc(handle_rtc_failure);
#endif
_tzset();
win_init_time();
win_init_registry();
DBUG_VOID_RETURN;
}
/*------------------------------------------------------------------
Name: CheckForTcpip| Desc: checks if tcpip has been installed on system
According to Microsoft Developers documentation the first registry
entry should be enough to check if TCP/IP is installed, but as expected
this doesn't work on all Win32 machines :(
------------------------------------------------------------------*/
#define TCPIPKEY "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters"
#define WINSOCK2KEY "SYSTEM\\CurrentControlSet\\Services\\Winsock2\\Parameters"
#define WINSOCKKEY "SYSTEM\\CurrentControlSet\\Services\\Winsock\\Parameters"
static my_bool win32_have_tcpip(void)
{
HKEY hTcpipRegKey;
if (RegOpenKeyEx ( HKEY_LOCAL_MACHINE, TCPIPKEY, 0, KEY_READ,
&hTcpipRegKey) != ERROR_SUCCESS)
{
if (RegOpenKeyEx ( HKEY_LOCAL_MACHINE, WINSOCK2KEY, 0, KEY_READ,
&hTcpipRegKey) != ERROR_SUCCESS)
{
if (RegOpenKeyEx ( HKEY_LOCAL_MACHINE, WINSOCKKEY, 0, KEY_READ,
&hTcpipRegKey) != ERROR_SUCCESS)
if (!getenv("HAVE_TCPIP") || have_tcpip) /* Provide a workaround */
return (FALSE);
}
}
RegCloseKey ( hTcpipRegKey);
return (TRUE);
}
static my_bool win32_init_tcp_ip()
{
if (win32_have_tcpip())
{
WORD wVersionRequested = MAKEWORD( 2, 2 );
WSADATA wsaData;
/* Be a good citizen: maybe another lib has already initialised
sockets, so dont clobber them unless necessary */
if (WSAStartup( wVersionRequested, &wsaData ))
{
/* Load failed, maybe because of previously loaded
incompatible version; try again */
WSACleanup( );
if (!WSAStartup( wVersionRequested, &wsaData ))
have_tcpip=1;
}
else
{
if (wsaData.wVersion != wVersionRequested)
{
/* Version is no good, try again */
WSACleanup( );
if (!WSAStartup( wVersionRequested, &wsaData ))
have_tcpip=1;
}
else
have_tcpip=1;
}
}
return(0);
}
#endif /* __WIN__ */
#ifdef HAVE_PSI_INTERFACE
#if !defined(HAVE_PREAD) && !defined(_WIN32)
PSI_mutex_key key_my_file_info_mutex;
#endif /* !defined(HAVE_PREAD) && !defined(_WIN32) */
#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
PSI_mutex_key key_LOCK_localtime_r;
#endif /* !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R) */
#ifndef HAVE_GETHOSTBYNAME_R
PSI_mutex_key key_LOCK_gethostbyname_r;
#endif /* HAVE_GETHOSTBYNAME_R */
PSI_mutex_key key_BITMAP_mutex, key_IO_CACHE_append_buffer_lock,
key_IO_CACHE_SHARE_mutex, key_KEY_CACHE_cache_lock, key_LOCK_alarm,
key_my_thread_var_mutex, key_THR_LOCK_charset, key_THR_LOCK_heap,
key_THR_LOCK_isam, key_THR_LOCK_lock, key_THR_LOCK_malloc,
key_THR_LOCK_mutex, key_THR_LOCK_myisam, key_THR_LOCK_net,
key_THR_LOCK_open, key_THR_LOCK_threads,
key_TMPDIR_mutex, key_THR_LOCK_myisam_mmap;
static PSI_mutex_info all_mysys_mutexes[]=
{
#if !defined(HAVE_PREAD) && !defined(_WIN32)
{ &key_my_file_info_mutex, "st_my_file_info:mutex", 0},
#endif /* !defined(HAVE_PREAD) && !defined(_WIN32) */
#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
{ &key_LOCK_localtime_r, "LOCK_localtime_r", PSI_FLAG_GLOBAL},
#endif /* !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R) */
#ifndef HAVE_GETHOSTBYNAME_R
{ &key_LOCK_gethostbyname_r, "LOCK_gethostbyname_r", PSI_FLAG_GLOBAL},
#endif /* HAVE_GETHOSTBYNAME_R */
{ &key_BITMAP_mutex, "BITMAP::mutex", 0},
{ &key_IO_CACHE_append_buffer_lock, "IO_CACHE::append_buffer_lock", 0},
{ &key_IO_CACHE_SHARE_mutex, "IO_CACHE::SHARE_mutex", 0},
{ &key_KEY_CACHE_cache_lock, "KEY_CACHE::cache_lock", 0},
{ &key_LOCK_alarm, "LOCK_alarm", PSI_FLAG_GLOBAL},
{ &key_my_thread_var_mutex, "my_thread_var::mutex", 0},
{ &key_THR_LOCK_charset, "THR_LOCK_charset", PSI_FLAG_GLOBAL},
{ &key_THR_LOCK_heap, "THR_LOCK_heap", PSI_FLAG_GLOBAL},
{ &key_THR_LOCK_isam, "THR_LOCK_isam", PSI_FLAG_GLOBAL},
{ &key_THR_LOCK_lock, "THR_LOCK_lock", PSI_FLAG_GLOBAL},
{ &key_THR_LOCK_malloc, "THR_LOCK_malloc", PSI_FLAG_GLOBAL},
{ &key_THR_LOCK_mutex, "THR_LOCK::mutex", 0},
{ &key_THR_LOCK_myisam, "THR_LOCK_myisam", PSI_FLAG_GLOBAL},
{ &key_THR_LOCK_net, "THR_LOCK_net", PSI_FLAG_GLOBAL},
{ &key_THR_LOCK_open, "THR_LOCK_open", PSI_FLAG_GLOBAL},
{ &key_THR_LOCK_threads, "THR_LOCK_threads", PSI_FLAG_GLOBAL},
{ &key_TMPDIR_mutex, "TMPDIR_mutex", PSI_FLAG_GLOBAL},
{ &key_THR_LOCK_myisam_mmap, "THR_LOCK_myisam_mmap", PSI_FLAG_GLOBAL}
};
PSI_cond_key key_COND_alarm, key_IO_CACHE_SHARE_cond,
key_IO_CACHE_SHARE_cond_writer, key_my_thread_var_suspend,
key_THR_COND_threads;
static PSI_cond_info all_mysys_conds[]=
{
{ &key_COND_alarm, "COND_alarm", PSI_FLAG_GLOBAL},
{ &key_IO_CACHE_SHARE_cond, "IO_CACHE_SHARE::cond", 0},
{ &key_IO_CACHE_SHARE_cond_writer, "IO_CACHE_SHARE::cond_writer", 0},
{ &key_my_thread_var_suspend, "my_thread_var::suspend", 0},
{ &key_THR_COND_threads, "THR_COND_threads", 0}
};
#ifdef USE_ALARM_THREAD
PSI_thread_key key_thread_alarm;
static PSI_thread_info all_mysys_threads[]=
{
{ &key_thread_alarm, "alarm", PSI_FLAG_GLOBAL}
};
#endif /* USE_ALARM_THREAD */
#ifdef HUGETLB_USE_PROC_MEMINFO
PSI_file_key key_file_proc_meminfo;
#endif /* HUGETLB_USE_PROC_MEMINFO */
PSI_file_key key_file_charset, key_file_cnf;
static PSI_file_info all_mysys_files[]=
{
#ifdef HUGETLB_USE_PROC_MEMINFO
{ &key_file_proc_meminfo, "proc_meminfo", 0},
#endif /* HUGETLB_USE_PROC_MEMINFO */
{ &key_file_charset, "charset", 0},
{ &key_file_cnf, "cnf", 0}
};
void my_init_mysys_psi_keys()
{
const char* category= "mysys";
int count;
if (PSI_server == NULL)
return;
count= sizeof(all_mysys_mutexes)/sizeof(all_mysys_mutexes[0]);
PSI_server->register_mutex(category, all_mysys_mutexes, count);
count= sizeof(all_mysys_conds)/sizeof(all_mysys_conds[0]);
PSI_server->register_cond(category, all_mysys_conds, count);
#ifdef USE_ALARM_THREAD
count= sizeof(all_mysys_threads)/sizeof(all_mysys_threads[0]);
PSI_server->register_thread(category, all_mysys_threads, count);
#endif /* USE_ALARM_THREAD */
count= sizeof(all_mysys_files)/sizeof(all_mysys_files[0]);
PSI_server->register_file(category, all_mysys_files, count);
}
#endif /* HAVE_PSI_INTERFACE */
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