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Marius Gerbershagen authored
Replace slow homegrown mutex implementation by standard OS functions. We try our best to be interrupt safe, however a completely safe implementation is impossible (unless one completely removes the ability to interrupt a thread waiting on a mutex). There is always a window after the OS specific function has returned, but before we can set the owner, in which interrupts will see an inconsistent state of the mutex with regards to owner and count. Condition variables are now based on OS functions as well. Timed waiting on condition variables has also been implemented.
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