Reader/Writer with Semaphores

SharedLock::AcquireRead() {

rmx.P();

if (first reader)

wsem.P();

rmx.V();

}

SharedLock::ReleaseRead() {

rmx.P();

if (last reader)

wsem.V();

rmx.V();

}

SharedLock::AcquireWrite() {

wsem.P();

}

SharedLock::ReleaseWrite() {

wsem.V();

}

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