Matt Kline ebed0296b3 Axe atomic int (#4326) ...

* ThreadableJob: Move from AtomicInt to std::atomic

This is the first in a series of commits that migrates away from
AtomicInt towards the C++11 standard library types.
This would allow the removal of AtomicInt and related Qt
version-specific code.

While we're at it, also make ProcessingState an `enum class` so that
it's not implicitly convertible to integers.

* LocklessAllocator: Switch from AtomicInt to std::atomic_int

If it looks like some assignments around the Compare & Swap loops went
missing, it's because compare_exchange_weak() updates the first argument
to the current value when it fails (i.e., returns false).

* BufferManager: Remove extra AtomicInt include

* MixerWorkerThread: AtomicInt to std::atomic_int

* NotePlayHandle: AtomicInt to std::atomic_int

* Remove AtomicInt.h

* Move from QAtomicPointer to std::atomic<T*>

This removes some #ifdef trickery that was being used to get
load-acquire and store-release from Qt5 and "plain" (presumably
sequentially-consistent) loads and stores from Qt4.

2018-04-28 12:54:46 -07:00

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