fixed race condition in automatic binlog rotation

remove extension from binary log if the user specifies one to avoid
    non-rotatable logs
fixed possible use of unitialized IO_CACHE in debug mode

sql/log.cc

@@ -511,17 +511,19 @@ bool MYSQL_LOG::is_active(const char* log_file_name)
   return inited && !strcmp(log_file_name, this->log_file_name);
 }
 
-void MYSQL_LOG::new_file()
+void MYSQL_LOG::new_file(bool inside_mutex)
 {
   // only rotate open logs that are marked non-rotatable
   // (binlog with constant name are non-rotatable)
   if (is_open() && ! no_rotate)
   {
     char new_name[FN_REFLEN], *old_name=name;
-    VOID(pthread_mutex_lock(&LOCK_log));
+    if (!inside_mutex)
+      VOID(pthread_mutex_lock(&LOCK_log));
     if (generate_new_name(new_name, name))
     {
-      VOID(pthread_mutex_unlock(&LOCK_log));
+      if (!inside_mutex)
+        VOID(pthread_mutex_unlock(&LOCK_log));
       return;					// Something went wrong
     }
     if (log_type == LOG_BIN)
@@ -540,7 +542,8 @@ void MYSQL_LOG::new_file()
     my_free(old_name,MYF(0));
     last_time=query_start=0;
     write_error=0;
-    VOID(pthread_mutex_unlock(&LOCK_log));
+    if (!inside_mutex)
+      VOID(pthread_mutex_unlock(&LOCK_log));
   }
 }
 
@@ -695,9 +698,9 @@ err:
     if (file == &log_file)
       VOID(pthread_cond_broadcast(&COND_binlog_update));
   }
+  if (should_rotate)
+    new_file(1); // inside mutex
   VOID(pthread_mutex_unlock(&LOCK_log));
-  if(should_rotate)
-    new_file();
   return error;
 }
 
@@ -782,11 +785,13 @@ bool MYSQL_LOG::write(Load_log_event* event_info)
 	VOID(pthread_cond_broadcast(&COND_binlog_update));
       }
     }
+    
+    if(should_rotate)
+      new_file(1); // inside mutex
+    
     VOID(pthread_mutex_unlock(&LOCK_log));
   }
 
-  if(should_rotate)
-    new_file();
   
   return error;
 }

sql/mysqld.cc

@@ -1477,6 +1477,13 @@ static void open_log(MYSQL_LOG *log, const char *hostname,
     strmov(strcend(tmp,'.'),extension);
     opt_name=tmp;
   }
+  // get rid of extention if the log is binary to avoid problems
+  if (type == LOG_BIN)
+  {
+    char* p = strrchr(opt_name, FN_EXTCHAR);
+    if (p)
+      *p = 0;
+  }
   log->open(opt_name,type);
 }
 

sql/slave.cc

@@ -189,6 +189,11 @@ static void free_string_array(DYNAMIC_ARRAY *a)
 
 void end_slave()
 {
+  pthread_mutex_lock(&LOCK_slave);
+  while (slave_running)
+    pthread_cond_wait(&COND_slave_stopped, &LOCK_slave);
+  pthread_mutex_unlock(&LOCK_slave);
+  
   end_master_info(&glob_mi);
   if(do_table_inited)
     hash_free(&replicate_do_table);

sql/sql_class.h

@@ -74,7 +74,7 @@ public:
   void init(enum_log_type log_type_arg);
   void open(const char *log_name,enum_log_type log_type,
 	    const char *new_name=0);
-  void new_file(void);
+  void new_file(bool inside_mutex = 0);
   bool open_index(int options);
   void close_index();
   bool write(THD *thd, enum enum_server_command command,const char *format,...);

sql/sql_repl.cc

@@ -274,6 +274,7 @@ void mysql_binlog_send(THD* thd, char* log_ident, ulong pos, ushort flags)
   int left_events = max_binlog_dump_events;
 #endif  
   DBUG_ENTER("mysql_binlog_send");
+  bzero((char*) &log,sizeof(log));
 
 #ifndef DBUG_OFF
   if (opt_sporadic_binlog_dump_fail && (binlog_dump_count++ % 2))
@@ -283,7 +284,6 @@ void mysql_binlog_send(THD* thd, char* log_ident, ulong pos, ushort flags)
   }
 #endif  
 
-  bzero((char*) &log,sizeof(log));
 
   if(!mysql_bin_log.is_open())
   {