Replace amd::Atomic with std::atomic. Remove make_atomic uses by
converting the variable to std::atomic and making sure the memory
order is relaxed when synchronizes-with is not needed.
Delete utils/atomic.hpp.
Change-Id: I0b36db8d604a8510ac6e36b32885fd16a1b8ccfa
There is a small window where a thread can go to sleep in
Monitor::wait after releasing the lock but before another thread
notifies the monitor and updates the on-deck thread.
A simple approach to fix this problem is to wake-up the Monitor::wait
every 10 milliseconds and check if it is on-deck.
Change-Id: I4b9abda89d1fc653cdae2b4c84cdda01efde1cf2
There is no synchronize with relationship between the monitor micro-
lock and the onDeck microlock, so it is possible for an onDeck.load to
move above a contendersList.store, or a contendersList.load to move
above an ondeck.store.
To fix this issue a full memory fence (mm_mfence on x86) is needed
after the last store in the contendersList and onDeck critical regions.
Change-Id: I5beb7dfe0d21010c5bf00cd65d59b9c7af58e919
Laurent Morichetti