replication updates. This changeset seems to be working fine on test systems.

If no problems are discovered in the next week, this will make the replication
code ready for 4.0.2 release.


dbug/dbug.c:
  cleanup of my previous fix
sql/mysqld.cc:
  fixed a REALLY NASTY BUG - slave threads were being launched before 
  initialization of global thread keys. Thus if the slave thread was slow
  to start everything worked fine, but if it started quickly, we would get
  into trouble using the unitinialized keys
sql/net_pkg.cc:
  make net_printf() work with 0 error code taking the third argument as 
  format string in that case
sql/slave.cc:
  misc fix-ups and debugging instrumentations
sql/slave.h:
  added skip_log_purge member
sql/sql_class.cc:
  debugging instrumentation to track down random memory corruption
sql/sql_class.h:
  added debugging sentry to THD to track down memory corruption
sql/sql_repl.cc:
  fixed bugs in CHANGE MASTER

1 files changed, 8 insertions, 0 deletions

diff --git a/sql/sql_class.h b/sql/sql_class.h
index fa63cd90976..289a2ab9255 100644
--- a/sql/sql_class.h
+++ b/sql/sql_class.h
@@ -251,6 +251,11 @@ public:
 
 class delayed_insert;
 
+#define THD_SENTRY_MAGIC 0xfeedd1ff
+#define THD_SENTRY_GONE  0xdeadbeef
+
+#define THD_CHECK_SENTRY(thd) DBUG_ASSERT(thd->dbug_sentry == THD_SENTRY_MAGIC)
+
 /* For each client connection we create a separate thread with THD serving as
    a thread/connection descriptor */
 
@@ -312,6 +317,9 @@ public:
   // TODO: document the variables below
   MYSQL_LOCK *lock,*locked_tables;
   ULL	  *ull;
+#ifndef DBUG_OFF
+  uint dbug_sentry; // watch out for memory corruption
+#endif  
   struct st_my_thread_var *mysys_var;
   enum enum_server_command command;
   uint32 server_id;