Hamish Morrison d6d439f3f7 Reimplement unnamed POSIX semaphores using user_mutex
* Fixes sharing semantics, so non-shared semaphores in non-shared
  memory do not become shared after a fork.
* Adds two new system calls: _user_mutex_sem_acquire/release(),
  which reuse the user_mutex address-hashed wait mechanism.
* Named semaphores continue to use traditional sem_id semaphores.
2015-05-24 14:03:40 +01:00
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