Atomic variable Vs. Atomic operation

Question

Suppose I have two common variables - aand b- related to each other. When several applications use these common variables, access to them must be an atomic operation, otherwise the connection may be broken. Therefore, to ensure mutual exclusion, I placed their modification in a critical section protected by a lock.

critical_code
{
    P(mutex)
    a := something
    b := something
    V(mutex)
}

Suppose my hardware / OS / compiler supports atomic variables. Then I changed my code above as follows.

code
{
    atomic a := something
    atomic b := something
}

Can this code provide mutual exclusion when accessing multiple applications?

Regards,
Srinivas Nayak

Answer 1

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