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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02111-1301, USA */
/*
** Functions to handle initializating and allocationg of all mysys & debug
** thread variables.
*/
#include "mysys_priv.h"
#include <m_string.h>
#include <dbug.h>
#ifdef HAVE_OPENSSL
#include <openssl/ssl.h>
#include <openssl/err.h>
#endif
#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_net, THR_LOCK_mysys;
#ifdef HAVE_OPENSSL
pthread_mutex_t LOCK_ssl_config;
#endif
#ifndef HAVE_LOCALTIME_R
pthread_mutex_t LOCK_localtime_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 THR_KEY_mysys_initialized= FALSE;
/* FIXME Note. TlsAlloc does not set an auto destructor, so
the function my_thread_global_free must be called from
somewhere before final exit of the library */
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
THR_KEY_mysys_initialized= TRUE;
#ifdef HAVE_OPENSSL
pthread_mutex_init(&LOCK_ssl_config,MY_MUTEX_INIT_FAST);
#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_net,MY_MUTEX_INIT_FAST);
#ifdef _WIN32
/* win_pthread_init(); */
#endif
#ifndef HAVE_LOCALTIME_R
pthread_mutex_init(&LOCK_localtime_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
#ifdef HAVE_OPENSSL
pthread_mutex_destroy(&LOCK_ssl_config);
#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;
if (my_pthread_getspecific(struct st_my_thread_var *,THR_KEY_mysys))
{
DBUG_PRINT("info", ("my_thread_init was already called. Thread id: %lu",
pthread_self()));
return 0; /* Safequard */
}
/* We must have many calloc() here because these are freed on
pthread_exit */
if (!(tmp=(struct st_my_thread_var *)
calloc(1,sizeof(struct st_my_thread_var))))
{
return 1;
}
pthread_setspecific(THR_KEY_mysys,tmp);
if (tmp->initialized) /* Already initialized */
{
return 0;
}
pthread_mutex_init(&tmp->mutex,MY_MUTEX_INIT_FAST);
pthread_cond_init(&tmp->suspend, NULL);
pthread_mutex_lock(&THR_LOCK_lock);
tmp->id= ++thread_id;
pthread_mutex_unlock(&THR_LOCK_lock);
tmp->initialized= TRUE;
return 0;
}
void my_thread_end(void)
{
struct st_my_thread_var *tmp=
my_pthread_getspecific(struct st_my_thread_var *, THR_KEY_mysys);
if (tmp && tmp->initialized)
{
#if defined(HAVE_OPENSSL) && OPENSSL_VERSION_NUMBER < 0x10100000L
ERR_remove_thread_state(NULL);
#endif
#if !defined(DBUG_OFF)
if (tmp->dbug)
{
DBUG_POP();
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);
free(tmp);
pthread_setspecific(THR_KEY_mysys,0);
}
else
pthread_setspecific(THR_KEY_mysys,0);
}
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)
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;
}
extern void **my_thread_var_dbug()
{
struct st_my_thread_var *tmp;
/*
Instead of enforcing DBUG_ASSERT(THR_KEY_mysys_initialized) here,
which causes any DBUG_ENTER and related traces to fail when
used in init / cleanup code, we are more tolerant:
using DBUG_ENTER / DBUG_PRINT / DBUG_RETURN
when the dbug instrumentation is not in place will do nothing.
*/
if (! THR_KEY_mysys_initialized)
return NULL;
tmp= _my_thread_var();
return tmp && tmp->initialized ? (void **)&tmp->dbug : 0;
}
#endif /* DBUG_OFF */
#endif /* THREAD */
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