Semaphore is also known as signal lock, mainly used in inter-process synchronization and mutual exclusion, are used in mutually exclusive, it is usually as a resource lock. Semaphore usually through two atomic operations wait (P) and signal (V) to access. semaphore wait operation so that the value of+ 1, signal operation of the signal value of the volume of-1. The procedure to amend wait operation, so that it can apply more than one semaphore

pv2
...\basic.h
...\pv.cpp
...\pv.dsp
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...\pv.ncb
...\pv.opt
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