4. A multithreaded web server wishes to keep track of the number of requests it services (known as hits). Consider the two following strategies to prevent a race condition on the
variable hits. The first strategy is to use a basic mutex lock when updating hits:
int hits;
mutex_lock hit_lock;
hit_lock. acquire();
hits++;
hit_lock. release();
A second strategy is to use an atomic integer:
Atomic_t hits;
Atomic_inc(&hits);
Explain which of these two strategies is more efficient.

Pp 4.1 design and implement a class called sphere that contains instance data that represents the sphere’s diameter. define the sphere constructor to accept and initialize the diameter and include getter and setter methods for the diameter. include methods that calculate and return the volume and surface area of the sphere (see pp 3.5 for the formulas). include a tostring method that returns a one-line description of the sphere. create a driver class called multisphere, whose main method instantiates and updates several sphere objects.

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What does the faves button do? a. users mark a web page as a favorite b. leads other readers to favor a specific page c. readers sort and align their favicons, or favorite icons d. leads users to a message board where they can post questions