kc3-lang/SDL/src/atomic

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• Hash : 014f507c
  Author :
  Date : 2021-01-03T12:13:40
  

  Use specific acquire and release variants of InterlockedExchange on ARM
  
  _InterlockedExchange_rel() is required for correctness on ARM because
  the _ReadWriteBarrier() macro is only a compiler memory barrier, not a
  hardware memory barrier. Due to ARM's relaxed memory model, this means
  the '*lock = 0' write may be observed before the operations inside the
  lock, causing possible corruption of data protected by the lock.
  
  _InterlockedExchange_acq() is more efficient on ARM because it avoids an
  expensive full memory barrier that _InterlockedExchange() does.
  

• Files

• SDL_atomic.c
• SDL_spinlock.c

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