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mariadb/mysys/my_thr_init.c
monty@mashka.mysql.fi cab1dc628c CLIENT_MULTI_QUERIES -> CLIENT_MULTI_STATEMENTS 
New multi-key-cache handling. This was needed becasue the old one didn't work reliable with MERGE tables.
ALTER TABLE table_name ... CHARACTER SET  ... now changes all char/varchar/text columns to the given character set
(One must use ALTER TABLE ... DEFAULT CHARACTER SET ... to change the default character set)
Fixed that have_compress is detected properly (fixes problems with func_compress.test on platforms without zlib)
New syntax for CACHE INDEX ('keys' is optional if no index name is given and one mentions the key cache name only ones)
Removed compiler warnings
Added mysql_set_server_option() to allow clients like PHP to easaily set/reset the multi-statement flag.
2003-11-18 13:47:27 +02:00

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/* Copyright (C) 2000 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; either version 2 of the License, or
(at your option) any later version.
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 */
/*
Functions to handle initializating and allocationg of all mysys & debug
thread variables.
*/
#include "mysys_priv.h"
#include <m_string.h>
#ifdef THREAD
#ifdef USE_TLS
pthread_key(struct st_my_thread_var*, THR_KEY_mysys);
#else
pthread_key(struct st_my_thread_var, THR_KEY_mysys);
#endif /* USE_TLS */
pthread_mutex_t THR_LOCK_malloc,THR_LOCK_open,
THR_LOCK_lock,THR_LOCK_isam,THR_LOCK_myisam,THR_LOCK_heap,
THR_LOCK_net, THR_LOCK_charset;
#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
pthread_mutex_t LOCK_localtime_r;
#endif
#ifndef HAVE_GETHOSTBYNAME_R
pthread_mutex_t LOCK_gethostbyname_r;
#endif
#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
pthread_mutexattr_t my_fast_mutexattr;
#endif
#ifdef PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
pthread_mutexattr_t my_errchk_mutexattr;
#endif
my_bool my_thread_global_init(void)
{
if (pthread_key_create(&THR_KEY_mysys,free))
{
fprintf(stderr,"Can't initialize threads: error %d\n",errno);
exit(1);
}
#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
pthread_mutexattr_init(&my_fast_mutexattr);
pthread_mutexattr_setkind_np(&my_fast_mutexattr,PTHREAD_MUTEX_ADAPTIVE_NP);
#endif
#ifdef PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
pthread_mutexattr_init(&my_errchk_mutexattr);
pthread_mutexattr_setkind_np(&my_errchk_mutexattr,
PTHREAD_MUTEX_ERRORCHECK_NP);
#endif
pthread_mutex_init(&THR_LOCK_malloc,MY_MUTEX_INIT_FAST);
pthread_mutex_init(&THR_LOCK_open,MY_MUTEX_INIT_FAST);
pthread_mutex_init(&THR_LOCK_lock,MY_MUTEX_INIT_FAST);
pthread_mutex_init(&THR_LOCK_isam,MY_MUTEX_INIT_SLOW);
pthread_mutex_init(&THR_LOCK_myisam,MY_MUTEX_INIT_SLOW);
pthread_mutex_init(&THR_LOCK_heap,MY_MUTEX_INIT_FAST);
pthread_mutex_init(&THR_LOCK_net,MY_MUTEX_INIT_FAST);
pthread_mutex_init(&THR_LOCK_charset,MY_MUTEX_INIT_FAST);
#if defined( __WIN__) || defined(OS2)
win_pthread_init();
#endif
#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
pthread_mutex_init(&LOCK_localtime_r,MY_MUTEX_INIT_SLOW);
#endif
#ifndef HAVE_GETHOSTBYNAME_R
pthread_mutex_init(&LOCK_gethostbyname_r,MY_MUTEX_INIT_SLOW);
#endif
return my_thread_init();
}
void my_thread_global_end(void)
{
#if defined(USE_TLS)
(void) TlsFree(THR_KEY_mysys);
#endif
#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
pthread_mutexattr_destroy(&my_fast_mutexattr);
#endif
#ifdef PPTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
pthread_mutexattr_destroy(&my_errchk_mutexattr);
#endif
pthread_mutex_destroy(&THR_LOCK_malloc);
pthread_mutex_destroy(&THR_LOCK_open);
pthread_mutex_destroy(&THR_LOCK_lock);
pthread_mutex_destroy(&THR_LOCK_isam);
pthread_mutex_destroy(&THR_LOCK_myisam);
pthread_mutex_destroy(&THR_LOCK_heap);
pthread_mutex_destroy(&THR_LOCK_net);
pthread_mutex_destroy(&THR_LOCK_charset);
#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
pthread_mutex_destroy(&LOCK_localtime_r);
#endif
#ifndef HAVE_GETHOSTBYNAME_R
pthread_mutex_destroy(&LOCK_gethostbyname_r);
#endif
}
static long thread_id=0;
/*
We can't use mutex_locks here if we are using windows as
we may have compiled the program with SAFE_MUTEX, in which
case the checking of mutex_locks will not work until
the pthread_self thread specific variable is initialized.
*/
my_bool my_thread_init(void)
{
struct st_my_thread_var *tmp;
my_bool error=0;
#ifdef EXTRA_DEBUG_THREADS
fprintf(stderr,"my_thread_init(): thread_id=%ld\n",pthread_self());
#endif
#if !defined(__WIN__) || defined(USE_TLS) || ! defined(SAFE_MUTEX)
pthread_mutex_lock(&THR_LOCK_lock);
#endif
#if !defined(__WIN__) || defined(USE_TLS)
if (my_pthread_getspecific(struct st_my_thread_var *,THR_KEY_mysys))
{
#ifdef EXTRA_DEBUG_THREADS
fprintf(stderr,"my_thread_init() called more than once in thread %ld\n",
pthread_self());
#endif
goto end;
}
if (!(tmp= (struct st_my_thread_var *) calloc(1, sizeof(*tmp))))
{
error= 1;
goto end;
}
pthread_setspecific(THR_KEY_mysys,tmp);
#else
/*
Skip initialization if the thread specific variable is already initialized
*/
if (THR_KEY_mysys.id)
goto end;
tmp= &THR_KEY_mysys;
#endif
tmp->id= ++thread_id;
pthread_mutex_init(&tmp->mutex,MY_MUTEX_INIT_FAST);
pthread_cond_init(&tmp->suspend, NULL);
tmp->init= 1;
end:
#if !defined(__WIN__) || defined(USE_TLS) || ! defined(SAFE_MUTEX)
pthread_mutex_unlock(&THR_LOCK_lock);
#endif
return error;
}
void my_thread_end(void)
{
struct st_my_thread_var *tmp;
tmp= my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
#ifdef EXTRA_DEBUG_THREADS
fprintf(stderr,"my_thread_end(): tmp=%p,thread_id=%ld\n",
tmp,pthread_self());
#endif
if (tmp && tmp->init)
{
#if !defined(DBUG_OFF)
/* tmp->dbug is allocated inside DBUG library */
if (tmp->dbug)
{
free(tmp->dbug);
tmp->dbug=0;
}
#endif
#if !defined(__bsdi__) || defined(HAVE_mit_thread) /* bsdi dumps core here */
pthread_cond_destroy(&tmp->suspend);
#endif
pthread_mutex_destroy(&tmp->mutex);
#if (!defined(__WIN__) && !defined(OS2)) || defined(USE_TLS)
free(tmp);
#else
tmp->init= 0;
#endif
}
/* The following free has to be done, even if my_thread_var() is 0 */
#if (!defined(__WIN__) && !defined(OS2)) || defined(USE_TLS)
pthread_setspecific(THR_KEY_mysys,0);
#endif
}
struct st_my_thread_var *_my_thread_var(void)
{
struct st_my_thread_var *tmp=
my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
#if defined(USE_TLS)
/* This can only happen in a .DLL */
if (!tmp)
{
my_thread_init();
tmp=my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
}
#endif
return tmp;
}
/****************************************************************************
Get name of current thread.
****************************************************************************/
#define UNKNOWN_THREAD -1
long my_thread_id()
{
#if defined(HAVE_PTHREAD_GETSEQUENCE_NP)
return pthread_getsequence_np(pthread_self());
#elif (defined(__sun) || defined(__sgi) || defined(__linux__)) && !defined(HAVE_mit_thread)
return pthread_self();
#else
return my_thread_var->id;
#endif
}
#ifdef DBUG_OFF
const char *my_thread_name(void)
{
return "no_name";
}
#else
const char *my_thread_name(void)
{
char name_buff[100];
struct st_my_thread_var *tmp=my_thread_var;
if (!tmp->name[0])
{
long id=my_thread_id();
sprintf(name_buff,"T@%ld", id);
strmake(tmp->name,name_buff,THREAD_NAME_SIZE);
}
return tmp->name;
}
#endif /* DBUG_OFF */
#endif /* THREAD */
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