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...and there you have it. Checked your code, you now have a race condition thanks to semaphores. First, what does the semaphore exactly protect? Anything it protects in LibOpen can go away without getting the semaphore in LibClose(), so it's not exactly helping, right?
Second, a task could remove your library while the semaphore is blocked. You need to increment the lib Open counter *outside* of the semaphore as this counter protects the library from going away *while* the semaphore is blocked.
Then, as said, you need to get LibClose() right to work with the semaphore.
As I said, avoid this... Think twice where a task could block, and what could happen in parallel while the semaphore is blocked.
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