You are adding a public method named UpdateGrade to a public class named ReportCard.
The code region that updates the grade field must meet the following requirements:
It must be accessed by only one thread at a time.
It must not be vulnerable to a deadlock situation.
You need to implement the UpdateGrade() method.
What should you do?
A.
Option A
B.
Option B
C.
Option C
D.
Option D
I believe the answer is Option A.
Because the class is public, you need a private lock Object.
https://msdn.microsoft.com/en-us/library/c5kehkcz.aspx
I believe in A.
Once the ReportCard is public, other process can lock on type or instance
– So, B and C are leaning to a DEADLOCK;
[MethodImpl] attribute works locking on type (for static members) or on the instance(for instance members). So, D could cause a DEADLOCK too.