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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
- test with threaded process terminating and semadj (?) being applied
only after all threads are gone
- system() is cancelable. What happens to the child process? It probably
should be killed.
The signal handler setting is a process resource. Setting and resetting
it from multiple thread must be possible.
- the syscall wrapping code should really be in libc
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