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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?