public void rpc_PlayGame(PlayGameRequest req, OnRpcReturn <PlayGameResponse> callback)
{
// <--- 此处如果不加锁，假如同时两个PlayGameRequest过来，则可能会导致coinCount为负数
this.coinLocker.LockAsync().ContinueWith((_lock) =>
{
//判断硬币数量够不够
if (coinCount > req.count)
{
//异步调用，消耗硬币
machine.Call <PlayGameResponse>(req, new OnRpcReturn <PlayGameResponse>((rsp, err) =>
{
//消耗硬币
coinCount -= rsp.usedCoin;
//返回结果
callback(rsp);
_lock.Dispose();
}));
}
else
{
//返回失败结果
callback(new PlayGameResponse()
{
s2c_code = Response.CODE_ERROR
});
_lock.Dispose();
}
});
}