Merge amd64.(none):/src/mysql-5.1-bugteam

into  amd64.(none):/src/bug26243/my51-bug26243


libmysql/libmysql.c:
  Auto merged
sql/mysqld.cc:
  Auto merged
sql/set_var.cc:
  Auto merged
sql/slave.cc:
  Auto merged
sql/sql_cache.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
storage/federated/ha_federated.cc:
  Auto merged
storage/innobase/handler/ha_innodb.cc:
  Auto merged
storage/myisam/mi_open.c:
  Auto merged
storage/myisammrg/ha_myisammrg.cc:
  Auto merged
tests/mysql_client_test.c:
  Auto merged

client/mysql.cc

@@ -1269,12 +1269,12 @@ sig_handler handle_sigint(int sig)
 
   /* terminate if no query being executed, or we already tried interrupting */
   if (!executing_query || interrupted_query)
-    mysql_end(sig);
+    goto err;
 
   kill_mysql= mysql_init(kill_mysql);
   if (!mysql_real_connect(kill_mysql,current_host, current_user, opt_password,
                           "", opt_mysql_port, opt_mysql_unix_port,0))
-    mysql_end(sig);
+    goto err;
 
   /* kill_buffer is always big enough because max length of %lu is 15 */
   sprintf(kill_buffer, "KILL /*!50000 QUERY */ %lu", mysql_thread_id(&mysql));
@@ -1283,6 +1283,22 @@ sig_handler handle_sigint(int sig)
   tee_fprintf(stdout, "Query aborted by Ctrl+C\n");
 
   interrupted_query= 1;
+
+  return;
+
+err:
+#ifdef _WIN32
+  /*
+   When SIGINT is raised on Windows, the OS creates a new thread to handle the
+   interrupt. Once that thread completes, the main thread continues running 
+   only to find that it's resources have already been free'd when the sigint 
+   handler called mysql_end(). 
+  */
+  mysql_thread_end();
+  return;
+#else
+  mysql_end(sig);
+#endif  
 }