Commit d3b7fce8 authored by istruewing@blade08.mysql.com's avatar istruewing@blade08.mysql.com

Merge istruewing@bk-internal.mysql.com:/home/bk/mysql-5.1-engines

into  blade08.mysql.com:/data0/istruewing/autopush/mysql-5.1-bug25460
parents 31329c83 67d97254
......@@ -350,11 +350,13 @@ int mi_extra(MI_INFO *info, enum ha_extra_function function, void *extra_arg)
#ifdef HAVE_MMAP
pthread_mutex_lock(&share->intern_lock);
/*
Memory map the data file if it is not already mapped and if there
are no other threads using this table. intern_lock prevents other
threads from starting to use the table while we are mapping it.
Memory map the data file if it is not already mapped. It is safe
to memory map a file while other threads are using file I/O on it.
Assigning a new address to a function pointer is an atomic
operation. intern_lock prevents that two or more mappings are done
at the same time.
*/
if (!share->file_map && (share->tot_locks == 1))
if (!share->file_map)
{
if (mi_dynmap_file(info, share->state.state.data_file_length))
{
......
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