The circuit then occurs only when a shared resource
(Mutual exclusion)
holding and looking forward (Hold and Wait).
do not insert in the middle (No Preemption)
when the process needs to use the resources of the system. Will have to follow the sequence of various:
.Request (Request) if the request is not approved by the system immediately
usage (Use) process that can use resources get
night. (Release) process to return the resources used, back to the system.
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