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- - we should probably extend pthread_mutexattr_t with a field to create a
- single linked list of all instances. This requires changing the
- pthread_mutexattr_* functions.
- - a new attribute for mutexes: number of times we spin before calling
- sys_futex
- - for adaptive mutexes: when releasing, determine whether somebody spins.
- If yes, for a short time release lock. If someone else locks no wakeup
- syscall needed.
- - test with threaded process terminating and semadj (?) being applied
- only after all threads are gone
- - semaphore changes:
- - sem_post should only wake one thread and only when the state of
- the semaphore changed from 0 to 1
- this also requires that sem_wait and sem_timedwait don't drop the
- post if they get canceled.
- - possibly add counter field. This requires reviving the
- differences between old and new semaphose funtions. The old ones
- stay as they are now. The new once can use an additional field
- wich is the counter for the number of waiters
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