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WL#4259 - Debug Sync Facility

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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
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9
mysql-test/mysql-test-run.pl
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@ -226,6 +226,7 @@ my @default_valgrind_args= ("--show-reachable=yes");
my @valgrind_args;
my $opt_valgrind_path;
my $opt_callgrind;
my $opt_debug_sync_timeout= 300; # Default timeout for WAIT_FOR actions.
our $opt_warnings= 1;
@ -867,6 +868,7 @@ sub command_line_setup {
'valgrind-option=s' => \@valgrind_args,
'valgrind-path=s' => \$opt_valgrind_path,
'callgrind' => \$opt_callgrind,
'debug-sync-timeout=i' => \$opt_debug_sync_timeout,
# Directories
'tmpdir=s' => \$opt_tmpdir,
@ -4170,6 +4172,11 @@ sub mysqld_arguments ($$$) {
mtr_add_arg($args, "%s", "--core-file");
}
# Enable the debug sync facility, set default wait timeout.
# Facility stays disabled if timeout value is zero.
mtr_add_arg($args, "--loose-debug-sync-timeout=%s",
$opt_debug_sync_timeout);
return $args;
}
@ -5280,6 +5287,8 @@ Misc options
to turn off.
sleep=SECONDS Passed to mysqltest, will be used as fixed sleep time
debug-sync-timeout=NUM Set default timeout for WAIT_FOR debug sync
actions. Disable facility with NUM=0.
gcov Collect coverage information after the test.
The result is a gcov file per source and header file.
experimental=<file> Refer to list of tests considered experimental;