Merge mysql.com:/home/svoj/devel/mysql/BUG25712/mysql-4.1-engines

into  mysql.com:/home/svoj/devel/mysql/BUG25712/mysql-5.0-engines

include/my_sys.h

@@ -66,8 +66,8 @@ extern int NEAR my_errno;		/* Last error in mysys */
 #define MY_ALLOW_ZERO_PTR 64	/* my_realloc() ; zero ptr -> malloc */
 #define MY_FREE_ON_ERROR 128	/* my_realloc() ; Free old ptr on error */
 #define MY_HOLD_ON_ERROR 256	/* my_realloc() ; Return old ptr on error */
-#define MY_THREADSAFE	128	/* pread/pwrite:  Don't allow interrupts */
 #define MY_DONT_OVERWRITE_FILE 1024	/* my_copy: Don't overwrite file */
+#define MY_THREADSAFE 2048      /* my_seek(): lock fd mutex */
 
 #define MY_CHECK_ERROR	1	/* Params to my_end; Check open-close */
 #define MY_GIVE_INFO	2	/* Give time info about process*/