Binary Semaphore a.k.a. Mutex a.k.a. Lock

Pben Pbud

wait( S ) wait( S )

… …

Withdrawal Deposit

… …

signal( S ) signal( S )

Balance = $100.00

S = 1

Ben B.

1 means free

0 means busy

critical

section

(C. S.)

critical

section

(C. S.)

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