function exitShelter(uint256[] calldata _pids) external onlyOwner {
    for(uint256 i = 0; i<_pids.length; i++){
        IRewardStaking pool = IRewardStaking(convexPool[_pids[i]]);
        IERC20 lpToken = IERC20(
            pool.poolInfo(_pids[i]).lptoken
        );
        amountInShelter[lpToken] = 0;
        shelter.deactivate(lpToken);
    }
}
function withdraw(uint256 _pid, uint256 _amount)
    external
    nonReentrant
    whenNotInShelter(_pid)
{
    WithdrawRequest memory request = withdrawRequest[_pid][msg.sender];
    require(request.epoch < currentEpoch() && deposits[_pid][msg.sender].epoch + 1 < currentEpoch(), "wait");
    require(request.amount >= _amount, "too much");
    _checkpoint(_pid, msg.sender);
    deposits[_pid][msg.sender].amount -= uint192(_amount);
    if (_amount > 0) {
        IRewardStaking(convexPool[_pid]).withdrawAndUnwrap(_amount, false);
        IERC20 lpToken = IERC20(
            IRewardStaking(convexPool[_pid]).poolInfo(_pid).lptoken
        );
        lpToken.safeTransfer(msg.sender, _amount);
        uint256 pid = masterChef.pid(address(lpToken));
        masterChef.withdraw(msg.sender, pid, _amount);
    }
    delete withdrawRequest[_pid][msg.sender];
    //events
    emit Withdrawn(msg.sender, _amount);
}
