database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-12-24 11:21:21 +03:00
Code Activity

WL#4259 - Debug Sync Facility

Browse Source 
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.
This commit is contained in:
Ingo Struewing
2009-09-29 17:38:40 +02:00
parent 8b9843408d
commit 21586dfb08
25 changed files with 2846 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
sql/sql_base.cc
View File

@@ -17,6 +17,7 @@
/* Basic functions needed by many modules */
#include "mysql_priv.h"
#include "debug_sync.h"
#include "sql_select.h"
#include "sp_head.h"
#include "sp.h"
@@ -950,6 +951,7 @@ bool close_cached_tables(THD *thd, TABLE_LIST *tables, bool have_lock,
close_old_data_files(thd,thd->open_tables,1,1);
mysql_ha_flush(thd);
DEBUG_SYNC(thd, "after_flush_unlock");
bool found=1;
/* Wait until all threads has closed all the tables we had locked */
@@ -5289,6 +5291,8 @@ int lock_tables(THD *thd, TABLE_LIST *tables, uint count, bool *need_reopen)
}
}
DEBUG_SYNC(thd, "before_lock_tables_takes_lock");
if (! (thd->lock= mysql_lock_tables(thd, start, (uint) (ptr - start),
lock_flag, need_reopen)))
{