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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_keycache,
THR_LOCK_lock,THR_LOCK_isam,THR_LOCK_myisam,THR_LOCK_heap,
THR_LOCK_net, THR_LOCK_charset;
#ifndef HAVE_LOCALTIME_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 PPTHREAD_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_keycache,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
#ifndef HAVE_LOCALTIME_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
#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
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);
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=my_thread_var;
#ifdef EXTRA_DEBUG_THREADS
fprintf(stderr,"my_thread_end(): tmp=%p,thread_id=%ld\n",
tmp,pthread_self());
#endif
if (tmp)
{
#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);
#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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