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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.
61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
#ifndef DEBUG_SYNC_INCLUDED
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#define DEBUG_SYNC_INCLUDED
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/* Copyright (C) 2008 Sun Microsystems, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/**
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@file
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Declarations for the Debug Sync Facility. See debug_sync.cc for details.
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*/
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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface /* gcc class implementation */
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#endif
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#include <my_global.h>
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class THD;
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#if defined(ENABLED_DEBUG_SYNC)
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/* Macro to be put in the code at synchronization points. */
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#define DEBUG_SYNC(_thd_, _sync_point_name_) \
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do { if (unlikely(opt_debug_sync_timeout)) \
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debug_sync(_thd_, STRING_WITH_LEN(_sync_point_name_)); \
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} while (0)
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/* Command line option --debug-sync-timeout. See mysqld.cc. */
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extern uint opt_debug_sync_timeout;
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/* Default WAIT_FOR timeout if command line option is given without argument. */
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#define DEBUG_SYNC_DEFAULT_WAIT_TIMEOUT 300
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/* Debug Sync prototypes. See debug_sync.cc. */
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extern int debug_sync_init(void);
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extern void debug_sync_end(void);
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extern void debug_sync_init_thread(THD *thd);
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extern void debug_sync_end_thread(THD *thd);
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extern void debug_sync(THD *thd, const char *sync_point_name, size_t name_len);
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#else /* defined(ENABLED_DEBUG_SYNC) */
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#define DEBUG_SYNC(_thd_, _sync_point_name_) /* disabled DEBUG_SYNC */
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#endif /* defined(ENABLED_DEBUG_SYNC) */
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#endif /* DEBUG_SYNC_INCLUDED */
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