Worksheet 21

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Worksheet 21: Atomics

Given the documentation for AtomicInteger's get, compareAndSet, and incrementAndGet methods:

- - get
```
public final int get()
```
    Gets the current value.
    
    Returns:
    
    the current value
  - compareAndSet
```
public final boolean compareAndSet(int expect, int update)
```
    Atomically sets the value to the given updated value if the current value == the expected value.
    
    Parameters:
    
    expect - the expected value
    
    update - the new value
    
    Returns:
    
    true if successful. False return indicates that the actual value was not equal to the expected value.
  - incrementAndGet
```
public final int incrementAndGet()
```
    Atomically increments by one the current value.
    
    Returns:
    
    the updated value

1) Write pseudocode for incrementAndGet() invoking only get and compareAndSet methods:

2) How would the code would perform under (high, medium, low) levels of contention?

Post Lecture

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