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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
wait forever.

mutex_wait would use PCATCH for its sleeps and return EINTR if a signal
was caught.

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