Havender’s method for denying the “wait-for” condition requires that processes must request all of the resources they will need before the system may let them proceed. The system grants resources on an “all-or-none” basis. Discuss the pros and cons of this method.
What will be an ideal response?
Its chief pro is that it works. Also, it is easy to implement. It appears to be a reasonable approach from the user’s perspective. Its cons are many. Because the process must request and receive all its resources in advance, considerable waste can occur if many of these resources are not needed until well into the processing of the job. Depending on how this strategy is implemented, it may cause indefinite postponement of jobs with larger resource needs if jobs with smaller resource needs continue to arrive and are allowed to proceed when their resources become available. If not, then considerable waste of resources also occurs as the system accumulates the resources needed by a larger job. Also, processes may not be able to determine all the resources they will need prior to execution.
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