An indirect method of deadlock prevention is to prevent the occurrence of one of the first three necessary conditions. A direct method of deadlock prevention is to prevent the occurrence of a circular wait.
 |
Mutual exclusion: The operating system has to support the mutual exclusion of resources. |
|
Hold and wait: The hold-and-wait condition can be prevented if the process has to request all the |
| needed resources at one time. |
|
No preemption: This condition can be prevented if a process cannot have a requested resource will |
| release its original resources. |
|
Circular wait: This condition can be prevented if the resources are defined in order. Then the process |
| can request the resources in order. |