mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-16 03:52:35 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions
mariadb/mysys/my_thr_init.c
Marc Alff 3d91522561 WL#2360 Performance schema 
Part IV: sql instrumentation
2010-01-06 22:42:07 -07:00

532 lines
15 KiB
C
Raw Blame History

/* Copyright (C) 2000 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 */
/*
Functions to handle initializating and allocationg of all mysys & debug
thread variables.
*/
#include "mysys_priv.h"
#include <m_string.h>
#include <signal.h>
#ifdef THREAD
pthread_key(struct st_my_thread_var*, THR_KEY_mysys);
mysql_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, THR_LOCK_threads, THR_LOCK_time,
THR_LOCK_myisam_mmap;
mysql_cond_t THR_COND_threads;
uint THR_thread_count= 0;
uint my_thread_end_wait_time= 5;
#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
mysql_mutex_t LOCK_localtime_r;
#endif
#ifndef HAVE_GETHOSTBYNAME_R
mysql_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_errorcheck_mutexattr;
#endif
#ifdef _MSC_VER
static void install_sigabrt_handler();
#endif
#ifdef TARGET_OS_LINUX
/*
Dummy thread spawned in my_thread_global_init() below to avoid
race conditions in NPTL pthread_exit code.
*/
static pthread_handler_t
nptl_pthread_exit_hack_handler(void *arg __attribute((unused)))
{
/* Do nothing! */
pthread_exit(0);
return 0;
}
#endif /* TARGET_OS_LINUX */
static uint get_thread_lib(void);
/** True if @c my_thread_basic_global_init() has been called. */
static my_bool my_thread_basic_global_init_done= 0;
/**
Perform a minimal initialisation of mysys, when compiled with threads.
The initialisation performed is sufficient to:
- allocate memory
- perform file operations
- use charsets
- use my_errno
@sa my_basic_init
@sa my_thread_basic_global_reinit
*/
my_bool my_thread_basic_global_init(void)
{
int pth_ret;
if (my_thread_basic_global_init_done)
return 0;
my_thread_basic_global_init_done= 1;
mysql_mutex_init(key_THR_LOCK_malloc, &THR_LOCK_malloc, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_THR_LOCK_open, &THR_LOCK_open, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_THR_LOCK_charset, &THR_LOCK_charset, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_THR_LOCK_threads, &THR_LOCK_threads, MY_MUTEX_INIT_FAST);
if ((pth_ret= pthread_key_create(&THR_KEY_mysys, NULL)) != 0)
{
fprintf(stderr, "Can't initialize threads: error %d\n", pth_ret);
return 1;
}
if (my_thread_init())
return 1;
return 0;
}
/**
Re-initialize components initialized early with @c my_thread_basic_global_init.
Some mutexes were initialized before the instrumentation.
Destroy + create them again, now that the instrumentation
is in place.
This is safe, since this function() is called before creating new threads,
so the mutexes are not in use.
*/
void my_thread_basic_global_reinit(void)
{
struct st_my_thread_var *tmp;
DBUG_ASSERT(my_thread_basic_global_init_done);
#ifdef HAVE_PSI_INTERFACE
my_init_mysys_psi_keys();
#endif
mysql_mutex_destroy(&THR_LOCK_malloc);
mysql_mutex_init(key_THR_LOCK_malloc, &THR_LOCK_malloc, MY_MUTEX_INIT_FAST);
mysql_mutex_destroy(&THR_LOCK_open);
mysql_mutex_init(key_THR_LOCK_open, &THR_LOCK_open, MY_MUTEX_INIT_FAST);
mysql_mutex_destroy(&THR_LOCK_charset);
mysql_mutex_init(key_THR_LOCK_charset, &THR_LOCK_charset, MY_MUTEX_INIT_FAST);
mysql_mutex_destroy(&THR_LOCK_threads);
mysql_mutex_init(key_THR_LOCK_threads, &THR_LOCK_threads, MY_MUTEX_INIT_FAST);
tmp= my_pthread_getspecific(struct st_my_thread_var*, THR_KEY_mysys);
DBUG_ASSERT(tmp);
mysql_mutex_destroy(&tmp->mutex);
mysql_mutex_init(key_my_thread_var_mutex, &tmp->mutex, MY_MUTEX_INIT_FAST);
mysql_cond_destroy(&tmp->suspend);
mysql_cond_init(key_my_thread_var_suspend, &tmp->suspend, NULL);
}
/*
initialize thread environment
SYNOPSIS
my_thread_global_init()
RETURN
0 ok
1 error (Couldn't create THR_KEY_mysys)
*/
my_bool my_thread_global_init(void)
{
if (my_thread_basic_global_init())
return 1;
thd_lib_detected= get_thread_lib();
#ifdef TARGET_OS_LINUX
/*
BUG#24507: Race conditions inside current NPTL pthread_exit()
implementation.
To avoid a possible segmentation fault during concurrent
executions of pthread_exit(), a dummy thread is spawned which
initializes internal variables of pthread lib. See bug description
for a full explanation.
TODO: Remove this code when fixed versions of glibc6 are in common
use.
*/
if (thd_lib_detected == THD_LIB_NPTL)
{
pthread_t dummy_thread;
pthread_attr_t dummy_thread_attr;
pthread_attr_init(&dummy_thread_attr);
pthread_attr_setdetachstate(&dummy_thread_attr, PTHREAD_CREATE_JOINABLE);
if (pthread_create(&dummy_thread,&dummy_thread_attr,
nptl_pthread_exit_hack_handler, NULL) == 0)
(void)pthread_join(dummy_thread, NULL);
}
#endif /* TARGET_OS_LINUX */
#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
/*
Set mutex type to "fast" a.k.a "adaptive"
In this case the thread may steal the mutex from some other thread
that is waiting for the same mutex. This will save us some
context switches but may cause a thread to 'starve forever' while
waiting for the mutex (not likely if the code within the mutex is
short).
*/
pthread_mutexattr_init(&my_fast_mutexattr);
pthread_mutexattr_settype(&my_fast_mutexattr,
PTHREAD_MUTEX_ADAPTIVE_NP);
#endif
#ifdef PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
/*
Set mutex type to "errorcheck"
*/
pthread_mutexattr_init(&my_errorcheck_mutexattr);
pthread_mutexattr_settype(&my_errorcheck_mutexattr,
PTHREAD_MUTEX_ERRORCHECK);
#endif
mysql_mutex_init(key_THR_LOCK_lock, &THR_LOCK_lock, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_THR_LOCK_isam, &THR_LOCK_isam, MY_MUTEX_INIT_SLOW);
mysql_mutex_init(key_THR_LOCK_myisam, &THR_LOCK_myisam, MY_MUTEX_INIT_SLOW);
mysql_mutex_init(key_THR_LOCK_myisam_mmap, &THR_LOCK_myisam_mmap, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_THR_LOCK_heap, &THR_LOCK_heap, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_THR_LOCK_net, &THR_LOCK_net, MY_MUTEX_INIT_FAST);
mysql_mutex_init(key_THR_LOCK_time, &THR_LOCK_time, MY_MUTEX_INIT_FAST);
mysql_cond_init(key_THR_COND_threads, &THR_COND_threads, NULL);
#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
mysql_mutex_init(key_LOCK_localtime_r, &LOCK_localtime_r, MY_MUTEX_INIT_SLOW);
#endif
#ifndef HAVE_GETHOSTBYNAME_R
mysql_mutex_init(key_LOCK_gethostbyname_r,
&LOCK_gethostbyname_r, MY_MUTEX_INIT_SLOW);
#endif
#ifdef _MSC_VER
install_sigabrt_handler();
#endif
if (my_thread_init())
{
my_thread_global_end(); /* Clean up */
return 1;
}
return 0;
}
void my_thread_global_end(void)
{
struct timespec abstime;
my_bool all_threads_killed= 1;
set_timespec(abstime, my_thread_end_wait_time);
mysql_mutex_lock(&THR_LOCK_threads);
while (THR_thread_count > 0)
{
int error= mysql_cond_timedwait(&THR_COND_threads, &THR_LOCK_threads,
&abstime);
if (error == ETIMEDOUT || error == ETIME)
{
#ifdef HAVE_PTHREAD_KILL
/*
We shouldn't give an error here, because if we don't have
pthread_kill(), programs like mysqld can't ensure that all threads
are killed when we enter here.
*/
if (THR_thread_count)
fprintf(stderr,
"Error in my_thread_global_end(): %d threads didn't exit\n",
THR_thread_count);
#endif
all_threads_killed= 0;
break;
}
}
mysql_mutex_unlock(&THR_LOCK_threads);
pthread_key_delete(THR_KEY_mysys);
#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
pthread_mutexattr_destroy(&my_fast_mutexattr);
#endif
#ifdef PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
pthread_mutexattr_destroy(&my_errorcheck_mutexattr);
#endif
mysql_mutex_destroy(&THR_LOCK_malloc);
mysql_mutex_destroy(&THR_LOCK_open);
mysql_mutex_destroy(&THR_LOCK_lock);
mysql_mutex_destroy(&THR_LOCK_isam);
mysql_mutex_destroy(&THR_LOCK_myisam);
mysql_mutex_destroy(&THR_LOCK_myisam_mmap);
mysql_mutex_destroy(&THR_LOCK_heap);
mysql_mutex_destroy(&THR_LOCK_net);
mysql_mutex_destroy(&THR_LOCK_time);
mysql_mutex_destroy(&THR_LOCK_charset);
if (all_threads_killed)
{
mysql_mutex_destroy(&THR_LOCK_threads);
mysql_cond_destroy(&THR_COND_threads);
}
#if !defined(HAVE_LOCALTIME_R) || !defined(HAVE_GMTIME_R)
mysql_mutex_destroy(&LOCK_localtime_r);
#endif
#ifndef HAVE_GETHOSTBYNAME_R
mysql_mutex_destroy(&LOCK_gethostbyname_r);
#endif
}
static my_thread_id thread_id= 0;
/*
Allocate thread specific memory for the thread, used by mysys and dbug
SYNOPSIS
my_thread_init()
NOTES
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.
This function may called multiple times for a thread, for example
if one uses my_init() followed by mysql_server_init().
RETURN
0 ok
1 Fatal error; mysys/dbug functions can't be used
*/
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: 0x%lx\n",
(ulong) pthread_self());
#endif
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 0x%lx\n",
(long) pthread_self());
#endif
goto end;
}
#ifdef _MSC_VER
install_sigabrt_handler();
#endif
if (!(tmp= (struct st_my_thread_var *) calloc(1, sizeof(*tmp))))
{
error= 1;
goto end;
}
pthread_setspecific(THR_KEY_mysys,tmp);
tmp->pthread_self= pthread_self();
mysql_mutex_init(key_my_thread_var_mutex, &tmp->mutex, MY_MUTEX_INIT_FAST);
mysql_cond_init(key_my_thread_var_suspend, &tmp->suspend, NULL);
tmp->stack_ends_here= (char*)&tmp +
STACK_DIRECTION * (long)my_thread_stack_size;
mysql_mutex_lock(&THR_LOCK_threads);
tmp->id= ++thread_id;
++THR_thread_count;
mysql_mutex_unlock(&THR_LOCK_threads);
tmp->init= 1;
#ifndef DBUG_OFF
/* Generate unique name for thread */
(void) my_thread_name();
#endif
end:
return error;
}
/*
Deallocate memory used by the thread for book-keeping
SYNOPSIS
my_thread_end()
NOTE
This may be called multiple times for a thread.
This happens for example when one calls 'mysql_server_init()'
mysql_server_end() and then ends with a mysql_end().
*/
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: 0x%lx pthread_self: 0x%lx thread_id: %ld\n",
(long) tmp, (long) pthread_self(), tmp ? (long) tmp->id : 0L);
#endif
#ifdef HAVE_PSI_INTERFACE
/*
Remove the instrumentation for this thread.
This must be done before trashing st_my_thread_var,
because the LF_HASH depends on it.
*/
if (PSI_server)
PSI_server->delete_current_thread();
#endif
if (tmp && tmp->init)
{
#if !defined(DBUG_OFF)
/* tmp->dbug is allocated inside DBUG library */
if (tmp->dbug)
{
DBUG_POP();
free(tmp->dbug);
tmp->dbug=0;
}
#endif
#if !defined(__bsdi__) && !defined(__OpenBSD__)
/* bsdi and openbsd 3.5 dumps core here */
mysql_cond_destroy(&tmp->suspend);
#endif
mysql_mutex_destroy(&tmp->mutex);
free(tmp);
/*
Decrement counter for number of running threads. We are using this
in my_thread_global_end() to wait until all threads have called
my_thread_end and thus freed all memory they have allocated in
my_thread_init() and DBUG_xxxx
*/
mysql_mutex_lock(&THR_LOCK_threads);
DBUG_ASSERT(THR_thread_count != 0);
if (--THR_thread_count == 0)
mysql_cond_signal(&THR_COND_threads);
mysql_mutex_unlock(&THR_LOCK_threads);
}
pthread_setspecific(THR_KEY_mysys,0);
}
struct st_my_thread_var *_my_thread_var(void)
{
return my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
}
/****************************************************************************
Get name of current thread.
****************************************************************************/
my_thread_id my_thread_dbug_id()
{
return my_thread_var->id;
}
#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])
{
my_thread_id id= my_thread_dbug_id();
sprintf(name_buff,"T@%lu", (ulong) id);
strmake(tmp->name,name_buff,THREAD_NAME_SIZE);
}
return tmp->name;
}
/* Return pointer to DBUG for holding current state */
extern void **my_thread_var_dbug()
{
struct st_my_thread_var *tmp=
my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
return tmp && tmp->init ? &tmp->dbug : 0;
}
#endif /* DBUG_OFF */
static uint get_thread_lib(void)
{
#ifdef _CS_GNU_LIBPTHREAD_VERSION
char buff[64];
confstr(_CS_GNU_LIBPTHREAD_VERSION, buff, sizeof(buff));
if (!strncasecmp(buff, "NPTL", 4))
return THD_LIB_NPTL;
if (!strncasecmp(buff, "linuxthreads", 12))
return THD_LIB_LT;
#endif
return THD_LIB_OTHER;
}
#ifdef _WIN32
/*
In Visual Studio 2005 and later, default SIGABRT handler will overwrite
any unhandled exception filter set by the application and will try to
call JIT debugger. This is not what we want, this we calling __debugbreak
to stop in debugger, if process is being debugged or to generate
EXCEPTION_BREAKPOINT and then handle_segfault will do its magic.
*/
#if (_MSC_VER >= 1400)
static void my_sigabrt_handler(int sig)
{
__debugbreak();
}
#endif /*_MSC_VER >=1400 */
static void install_sigabrt_handler(void)
{
#if (_MSC_VER >=1400)
/*abort() should not override our exception filter*/
_set_abort_behavior(0,_CALL_REPORTFAULT);
signal(SIGABRT,my_sigabrt_handler);
#endif /* _MSC_VER >=1400 */
}
#endif
#endif /* THREAD */
Reference in a new issue View git blame Copy permalink