mirror of
https://github.com/MariaDB/server.git
synced 2025-01-17 12:32:27 +01:00
21586dfb08
Backport from 6.0 to 5.1.
Only those sync points are included, which are used in debug_sync.test.
The Debug Sync Facility allows to place synchronization points
in the code:
open_tables(...)
DEBUG_SYNC(thd, "after_open_tables");
lock_tables(...)
When activated, a sync point can
- Send a signal and/or
- Wait for a signal
Nomenclature:
- signal: A value of a global variable that persists
until overwritten by a new signal. The global
variable can also be seen as a "signal post"
or "flag mast". Then the signal is what is
attached to the "signal post" or "flag mast".
- send a signal: Assign the value (the signal) to the global
variable ("set a flag") and broadcast a
global condition to wake those waiting for
a signal.
- wait for a signal: Loop over waiting for the global condition until
the global value matches the wait-for signal.
Please find more information in the top comment in debug_sync.cc
or in the worklog entry.
60 lines
2 KiB
C++
60 lines
2 KiB
C++
#ifndef DEBUG_SYNC_INCLUDED
|
|
#define DEBUG_SYNC_INCLUDED
|
|
|
|
/* Copyright (C) 2008 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 */
|
|
|
|
/**
|
|
@file
|
|
|
|
Declarations for the Debug Sync Facility. See debug_sync.cc for details.
|
|
*/
|
|
|
|
#ifdef USE_PRAGMA_INTERFACE
|
|
#pragma interface /* gcc class implementation */
|
|
#endif
|
|
|
|
#include <my_global.h>
|
|
|
|
class THD;
|
|
|
|
#if defined(ENABLED_DEBUG_SYNC)
|
|
|
|
/* Macro to be put in the code at synchronization points. */
|
|
#define DEBUG_SYNC(_thd_, _sync_point_name_) \
|
|
do { if (unlikely(opt_debug_sync_timeout)) \
|
|
debug_sync(_thd_, STRING_WITH_LEN(_sync_point_name_)); \
|
|
} while (0)
|
|
|
|
/* Command line option --debug-sync-timeout. See mysqld.cc. */
|
|
extern uint opt_debug_sync_timeout;
|
|
|
|
/* Default WAIT_FOR timeout if command line option is given without argument. */
|
|
#define DEBUG_SYNC_DEFAULT_WAIT_TIMEOUT 300
|
|
|
|
/* Debug Sync prototypes. See debug_sync.cc. */
|
|
extern int debug_sync_init(void);
|
|
extern void debug_sync_end(void);
|
|
extern void debug_sync_init_thread(THD *thd);
|
|
extern void debug_sync_end_thread(THD *thd);
|
|
extern void debug_sync(THD *thd, const char *sync_point_name, size_t name_len);
|
|
|
|
#else /* defined(ENABLED_DEBUG_SYNC) */
|
|
|
|
#define DEBUG_SYNC(_thd_, _sync_point_name_) /* disabled DEBUG_SYNC */
|
|
|
|
#endif /* defined(ENABLED_DEBUG_SYNC) */
|
|
|
|
#endif /* DEBUG_SYNC_INCLUDED */
|