Method CheckState

include/Eigen/Eigen/src/ThreadPool/EventCount.h:211–220

  MaxSizeVector<Waiter>& waiters_;

  static void CheckState(uint64_t state, bool waiter = false) {
    static_assert(kEpochBits >= 20, "not enough bits to prevent ABA problem");
    const uint64_t waiters = (state & kWaiterMask) >> kWaiterShift;
    const uint64_t signals = (state & kSignalMask) >> kSignalShift;
    eigen_plain_assert(waiters >= signals);
    eigen_plain_assert(waiters < (1 << kWaiterBits) - 1);
    eigen_plain_assert(!waiter || waiters > 0);
    (void)waiters;
    (void)signals;
  }

  void Park(Waiter* w) {
    EIGEN_MUTEX_LOCK lock(w->mu);