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32 lines
1007 B
Plaintext
32 lines
1007 B
Plaintext
- we should probably extend pthread_mutexattr_t with a field to create a
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single linked list of all instances. This requires changing the
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pthread_mutexattr_* functions.
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- a new attribute for mutexes: number of times we spin before calling
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sys_futex
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- for adaptive mutexes: when releasing, determine whether somebody spins.
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If yes, for a short time release lock. If someone else locks no wakeup
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syscall needed.
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- test with threaded process terminating and semadj (?) being applied
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only after all threads are gone
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- semaphore changes:
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- sem_post should only wake one thread and only when the state of
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the semaphore changed from 0 to 1
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this also requires that sem_wait and sem_timedwait don't drop the
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post if they get canceled.
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- possibly add counter field. This requires reviving the
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differences between old and new semaphose funtions. The old ones
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stay as they are now. The new once can use an additional field
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wich is the counter for the number of waiters
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