P3a

Shared memory layout

1 PG = 4 KB

divide into 64 segments

64 bytes for each segment

*** reserve one segment for mutex

and use the rest of the 63 segments to keep track
of the stats of each client

If client A registers segment 8, then this segment is only for process A

When multiple clients enter the process pool
almost simultaneously, 

if the first available segment is 6,

then all these clients will potentially be
assigned to seg 6

Mutual exclusion / lock

Use lock to protect the instructions, where you assign the segment