WL#4259 - Debug Sync Facility

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.


.bzrignore:
  WL#4259 - Debug Sync Facility
  Added the symbolic link libmysqld/debug_sync.cc.
CMakeLists.txt:
  WL#4259 - Debug Sync Facility
  Added definition for ENABLED_DEBUG_SYNC.
configure.in:
  WL#4259 - Debug Sync Facility
  Added definition for ENABLED_DEBUG_SYNC.
include/my_sys.h:
  WL#4259 - Debug Sync Facility
  Added definition for the DEBUG_SYNC_C macro.
libmysqld/CMakeLists.txt:
  WL#4259 - Debug Sync Facility
  Added sql/debug_sync.cc.
libmysqld/Makefile.am:
  WL#4259 - Debug Sync Facility
  Added sql/debug_sync.cc.
mysql-test/include/have_debug_sync.inc:
  WL#4259 - Debug Sync Facility
  New include file.
mysql-test/mysql-test-run.pl:
  WL#4259 - Debug Sync Facility
  Added option --debug_sync_timeout.
mysql-test/r/debug_sync.result:
  WL#4259 - Debug Sync Facility
  New test result.
mysql-test/r/have_debug_sync.require:
  WL#4259 - Debug Sync Facility
  New require file.
mysql-test/t/debug_sync.test:
  WL#4259 - Debug Sync Facility
  New test file.
mysys/my_static.c:
  WL#4259 - Debug Sync Facility
  Added definition for debug_sync_C_callback_ptr.
mysys/thr_lock.c:
  WL#4259 - Debug Sync Facility
  Added sync point "wait_for_lock".
sql/CMakeLists.txt:
  WL#4259 - Debug Sync Facility
  Added debug_sync.cc and debug_sync.h.
sql/Makefile.am:
  WL#4259 - Debug Sync Facility
  Added debug_sync.cc and debug_sync.h.
sql/debug_sync.cc:
  WL#4259 - Debug Sync Facility
  New source file.
sql/debug_sync.h:
  WL#4259 - Debug Sync Facility
  New header file.
sql/mysqld.cc:
  WL#4259 - Debug Sync Facility
  Added opt_debug_sync_timeout.
  Added calls to debug_sync_init() and debug_sync_end().
  Fixed a purecov comment (unrelated).
sql/set_var.cc:
  WL#4259 - Debug Sync Facility
  Added server variable "debug_sync".
sql/set_var.h:
  WL#4259 - Debug Sync Facility
  Added declaration for server variable "debug_sync".
sql/share/errmsg.txt:
  WL#4259 - Debug Sync Facility
  Added error messages ER_DEBUG_SYNC_TIMEOUT and ER_DEBUG_SYNC_HIT_LIMIT.
sql/sql_base.cc:
  WL#4259 - Debug Sync Facility
  Added sync points "after_flush_unlock" and "before_lock_tables_takes_lock".
sql/sql_class.cc:
  WL#4259 - Debug Sync Facility
  Added initialization for debug_sync_control to THD::THD.
  Added calls to debug_sync_init_thread() and debug_sync_end_thread().
sql/sql_class.h:
  WL#4259 - Debug Sync Facility
  Added element debug_sync_control to THD.
storage/myisam/myisamchk.c:
  Fixed a typo in an error message string (unrelated).

1 files changed, 15 insertions, 0 deletions

diff --git a/sql/sql_class.cc b/sql/sql_class.cc
index daef5a26742..f75dc2cb88a 100644
--- a/sql/sql_class.cc
+++ b/sql/sql_class.cc
@@ -42,6 +42,7 @@
 
 #include "sp_rcontext.h"
 #include "sp_cache.h"
+#include "debug_sync.h"
 
 /*
   The following is used to initialise Table_ident with a internal
@@ -584,6 +585,9 @@ THD::THD()
    derived_tables_processing(FALSE),
    spcont(NULL),
    m_parser_state(NULL)
+#if defined(ENABLED_DEBUG_SYNC)
+   , debug_sync_control(0)
+#endif /* defined(ENABLED_DEBUG_SYNC) */
 {
   ulong tmp;
 
@@ -832,6 +836,11 @@ void THD::init(void)
   reset_current_stmt_binlog_row_based();
   bzero((char *) &status_var, sizeof(status_var));
   sql_log_bin_toplevel= options & OPTION_BIN_LOG;
+
+#if defined(ENABLED_DEBUG_SYNC)
+  /* Initialize the Debug Sync Facility. See debug_sync.cc. */
+  debug_sync_init_thread(this);
+#endif /* defined(ENABLED_DEBUG_SYNC) */
 }
 
 
@@ -911,6 +920,12 @@ void THD::cleanup(void)
     lock=locked_tables; locked_tables=0;
     close_thread_tables(this);
   }
+
+#if defined(ENABLED_DEBUG_SYNC)
+  /* End the Debug Sync Facility. See debug_sync.cc. */
+  debug_sync_end_thread(this);
+#endif /* defined(ENABLED_DEBUG_SYNC) */
+
   mysql_ha_cleanup(this);
   delete_dynamic(&user_var_events);
   hash_free(&user_vars);