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{$/\ast$\rmfamily\upshape{} only one process can enter critical section at one time: $\ast/$}\mbox{}\\
semaphore s = 1;\mbox{}\\
\mbox{}\\
down( s );\mbox{}\\
{$/\ast$\rmfamily\upshape{} critical section $\ast/$}\mbox{}\\
up( s );\mbox{}\\
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