// Update reward variables of the given pool to be up-to-date.
function updatePool(uint _pid) public {
    PoolInfo storage pool = poolInfo[_pid];
    if (block.number <= pool.lastRewardBlock) {
        return;
    }
    uint lpSupply = pool.depositToken.balanceOf(address(this));
    if (lpSupply == 0 || pool.allocPoint == 0) {
        pool.lastRewardBlock = block.number;
        return;
    }
    if(block.number >= endBlock) {
        pool.lastRewardBlock = block.number;
        return;
    }        

    uint multiplier = getMultiplier(pool.lastRewardBlock, block.number);
    uint concurReward = multiplier.mul(concurPerBlock).mul(pool.allocPoint).div(totalAllocPoint);
    pool.accConcurPerShare = pool.accConcurPerShare.add(concurReward.mul(_concurShareMultiplier).div(lpSupply));
    pool.lastRewardBlock = block.number;
}
