Deadlock Prevention

• Having seen that deadlock avoidance is essentially impossible, because it requires information about future requests, which is not known, how do real systems avoid deadlock?
• If we can ensure that at least one of the four following conditions is never satisfied, then deadlocks will be structurally impossible.
• The various approaches to deadlock prevention are summarized in Fig. 7.8.

  Figure 7.8: Summary of approaches, to deadlock prevention.