Merge quad.:/mnt/raid/alik/MySQL/devel/5.0-rt

into  quad.:/mnt/raid/alik/MySQL/devel/5.1-rt-merged


client/mysqlbinlog.cc:
  Auto merged
sql/slave.cc:
  Auto merged
sql/slave.h:
  Auto merged

2 files changed, 8 insertions, 7 deletions

diff --git a/sql/slave.cc b/sql/slave.cc
index 9dd52c60dad..ea0dde942da 100644
--- a/sql/slave.cc
+++ b/sql/slave.cc
@@ -1337,14 +1337,15 @@ bool show_master_info(THD* thd, Master_info* mi)
     protocol->prepare_for_resend();
 
     /*
-      TODO: we read slave_running without run_lock, whereas these variables
-      are updated under run_lock and not data_lock. In 5.0 we should lock
-      run_lock on top of data_lock (with good order).
+      slave_running can be accessed without run_lock but not other
+      non-volotile members like mi->io_thd, which is guarded by the mutex.
     */
+    pthread_mutex_lock(&mi->run_lock);
+    protocol->store(mi->io_thd ? mi->io_thd->proc_info : "", &my_charset_bin);
+    pthread_mutex_unlock(&mi->run_lock);
+
     pthread_mutex_lock(&mi->data_lock);
     pthread_mutex_lock(&mi->rli.data_lock);
-
-    protocol->store(mi->io_thd ? mi->io_thd->proc_info : "", &my_charset_bin);
     protocol->store(mi->host, &my_charset_bin);
     protocol->store(mi->user, &my_charset_bin);
     protocol->store((uint32) mi->port);
diff --git a/sql/slave.h b/sql/slave.h
index f1772bbc1fc..b4f1b7f7467 100644
--- a/sql/slave.h
+++ b/sql/slave.h
@@ -80,8 +80,8 @@ class Master_info;
   mi->rli does not either.
 
   In Master_info: run_lock, data_lock
-  run_lock protects all information about the run state: slave_running, and the
-  existence of the I/O thread (to stop/start it, you need this mutex).
+  run_lock protects all information about the run state: slave_running, thd
+  and the existence of the I/O thread to stop/start it, you need this mutex).
   data_lock protects some moving members of the struct: counters (log name,
   position) and relay log (MYSQL_BIN_LOG object).