fixed race that caused sig11s on simultaneous FLUSH LOGS

(possibly also fixes binlog filename corruption problems--hasn't
been reproduced since)

BitKeeper/etc/logging_ok

@@ -30,3 +30,4 @@ zak@balfor.local
 bar@bar.mysql.r18.ru
 paul@teton.kitebird.com
 serg@build.mysql2.com
+nick@mysql.com

sql/log.cc

@@ -513,12 +513,12 @@ bool MYSQL_LOG::is_active(const char* log_file_name)
 
 void MYSQL_LOG::new_file(bool inside_mutex)
 {
+  if (!inside_mutex)
+    VOID(pthread_mutex_lock(&LOCK_log));
   if (is_open())
   {
     char new_name[FN_REFLEN], *old_name=name;
-    if (!inside_mutex)
-      VOID(pthread_mutex_lock(&LOCK_log));
-
+ 
     if (!no_rotate)
     {
       /*
@@ -550,9 +550,9 @@ void MYSQL_LOG::new_file(bool inside_mutex)
     my_free(old_name,MYF(0));
     last_time=query_start=0;
     write_error=0;
-    if (!inside_mutex)
-      VOID(pthread_mutex_unlock(&LOCK_log));
   }
+  if (!inside_mutex)
+    VOID(pthread_mutex_unlock(&LOCK_log));
 }
 
 

sql/sql_parse.cc

@@ -2839,10 +2839,10 @@ bool reload_acl_and_cache(THD *thd, uint options, TABLE_LIST *tables)
   }
   if (options & REFRESH_LOG)
   {
-    mysql_log.new_file();
-    mysql_update_log.new_file();
-    mysql_bin_log.new_file();
-    mysql_slow_log.new_file();
+    mysql_log.new_file(0);
+    mysql_update_log.new_file(0);
+    mysql_bin_log.new_file(0);
+    mysql_slow_log.new_file(0);
     if (ha_flush_logs())
       result=1;
   }