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Minimal test - lines (24, 42)

Code

void NS_DispatchEventualMemoryPressure(MemoryPressureState aState) {
  /*
   * A new memory pressure event erases an ongoing (or stop of) memory pressure,
   * but an existing "new" memory pressure event takes precedence over a new
   * "ongoing" or "stop" memory pressure event.
   */
  switch (aState) {
    case MemPressure_None:
      sMemoryPressurePending = MemPressure_None;
      break;
    case MemPressure_New:
      sMemoryPressurePending = MemPressure_New;
      break;
    case MemPressure_Ongoing:
    case MemPressure_Stopping:
      sMemoryPressurePending.compareExchange(MemPressure_None, aState);
      break;
  }
}

Minimal test - lines (19, 22)

Code

MemoryPressureState NS_GetPendingMemoryPressure() {
  int32_t value = sMemoryPressurePending.exchange(MemPressure_None);
  return MemoryPressureState(value);
}

Minimal test - lines (44, 49)

Code

nsresult NS_DispatchMemoryPressure(MemoryPressureState aState) {
  NS_DispatchEventualMemoryPressure(aState);
  nsCOMPtr event =
      new Runnable("NS_DispatchEventualMemoryPressure");
  return NS_DispatchToMainThread(event);
}