From 21586dfb084b05ac7d98ee990d64637b4be9222a Mon Sep 17 00:00:00 2001
From: Ingo Struewing <ingo.struewing@sun.com>
Date: Tue, 29 Sep 2009 17:38:40 +0200
Subject: 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.
---
 configure.in | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index b974d7076d7..bec902f83c1 100644
--- a/configure.in
+++ b/configure.in
@@ -1708,6 +1708,23 @@ else
   CXXFLAGS="$OPTIMIZE_CXXFLAGS $CXXFLAGS"
 fi
 
+# Debug Sync Facility. NOTE: depends on 'with_debug'. Must be behind it.
+AC_MSG_CHECKING(if Debug Sync Facility should be enabled.)
+AC_ARG_ENABLE(debug_sync,
+              AS_HELP_STRING([--enable-debug-sync],
+                             [Build a version with Debug Sync Facility]),
+              [ enable_debug_sync=$enableval ],
+              [ enable_debug_sync=$with_debug ])
+
+if test "$enable_debug_sync" != "no"
+then
+  AC_DEFINE([ENABLED_DEBUG_SYNC], [1],
+            [If Debug Sync Facility should be enabled])
+  AC_MSG_RESULT([yes]) 
+else
+  AC_MSG_RESULT([no])
+fi
+
 # If we should allow error injection tests
 AC_ARG_WITH(error-inject,
     AC_HELP_STRING([--with-error-inject],[Enable error injection in MySQL Server]),
-- 
cgit v1.2.1