1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
%% This tests the presence of possible races due to an mnesia:dirty_read/
%% mnesia:dirty_write combination. It takes into account multiple
%% mnesia:dirty_writes that might exist.
-module(mnesia_dirty_read_write_double1).
-export([raise/3]).
-record(employee, {emp_no,
name,
salary,
sex,
phone,
room_no}).
raise(Eno, Raise, Room) ->
[E] = mnesia:dirty_read(employee, Eno),
Salary = E#employee.salary + Raise,
New = E#employee{salary = Salary},
mnesia:dirty_write(employee, New),
move(E, Room).
move(E, Room) ->
New = E#employee{room_no = Room},
mnesia:dirty_write(employee, New).
|
