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would a mutex_wait be useful?
I'd like to be able to do a mutex_enter(9) which could be interruptable.
If interrupted, it would return the error why it was interrupted.
Maybe called int mutex_wait(kmutex_t *mtx, int ticks); and if ticks == 0
becomes (mutex_tryenter(mtx) ? 0 : ETIMEOUT). If tick == -1, means
mutex_wait would use PCATCH for its sleeps and return EINTR if a signal
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