Answer Posted / manzoor elahi laskar

A deadlock is a situation in which two computer programs
sharing the same resource are effectively preventing each
other from accessing the resource, resulting in both
programs ceasing to function.
In order for deadlock order to avoid deadlock following
cases must be avoided.

• Mutual exclusion -a resource that cannot be used by
more than one process at a time. (Two processes cannot
simultaneously control the same resource or be in their
critical section).
• Hold and Wait - processes already holding resources
may request new resources
• No preemption - Once a process holds a resource, it
cannot be taken away by another process or the kernel.
• Circular wait - Each process is waiting to obtain a
resource which is held by another process.

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