Perform action using A and B Release resource A Release resource B

The resources A and B are the same as in the previous example – not simply dummy variables, as otherwise the programs are identical.

As before, if there are several such programs, Q1,Q2,Q3 which run at the same time using resources as before, there will be no problem.

However, if several of the Ps are set to run at the same time as several of the Qs, then a deadlock