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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
- in case a thread calls 'fork' the stacks of all the other threads in
the child process are currently list. Instead they should be recovered
and added to the stack cache. This can be done by adding another global
list (maybe one per cluster) which lists all running threads and which
is processed by the child branch of fork. All the stacks are simply
added to the stack cache.
- test with threaded process terminating and semadj (?) being applied
only after all threads are gone
- raise sends the signal to calling thread or process?
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