Linked Questions
12 questions linked to/from What is the order and concurrency behavior of multiple calls to a contract in a single transaction?
9
votes
2
answers
953
views
Update the same variable in parallel? [duplicate]
I have a global variable foo that I'd like people to be able to increment in a shared fashion.
int foo;
function addToFoo(int value) public {
foo += value
}
Im concerned that if this function ...
- 95
8
votes
1
answer
1k
views
Can you execute a contract twice in one block? [duplicate]
If you call a contract with two different tx from different account, can they be executed and mined in the same block?
If yes how do you guarantee order and concurrency integrity like deadlocks?
- 11.7k
0
votes
1
answer
2k
views
How do smart contracts handle race conditions? [duplicate]
Let's say I have deployed a smart contract game that rewards the first user that writes to contract after a point in time T. Naturally, every player will try to be that winner, causing many requests ...
- 125
0
votes
1
answer
2k
views
how blockchain can handle the concurrency? [duplicate]
I read some pages here about concurrency but I didn't give my answer, actually I am new to Bchain, consider this scenario:
There is a game contract on the blockchain for 4 Players, so far three ...
- 123
28
votes
3
answers
13k
views
What is the default ordering of transactions during mining?
I know that the yellow paper does not specify how transactions are to be ordered in a block and this is up to the miner to decide. But I am interested in how this is practically handled (I assume not ...
- 8,784
20
votes
2
answers
4k
views
What happens when a smart contract gets several similar calls in the same block?
What happens when a smart contract gets several similar calls in the same block?
Consider for instance this greeter:
contract greeter {
string name;
function setName(string name_) {
...
- 1,109
8
votes
4
answers
3k
views
Race conditions when calling remote contracts
Below I extracted the logic which calls a remote contract to calculate the amount of tokens to withdraw funds.
contact Example {
mapping (address => uint256) balances;
ERC20 token = ...; // ...
- 336
4
votes
1
answer
787
views
getStorageAt: What if two transactions in the same block?
I use web3.getStorageAt to access historical information. I can specify a block to see the content of a variable in a given block. But one block can contain several transactions, each modifying this ...
- 693
5
votes
2
answers
485
views
Is it possible to time a transaction such that it is the last in a block?
Is there some method to create a transaction and make sure that it is the last in that block? If not, how close can you get to being last?
The reason I ask is that the following page depends on that ...
- 1,322
3
votes
2
answers
654
views
Can a miner "cheat" my lottery smart contract?
I developed a smart contract that you:
1) Send 1 ether to an address, the contract saves your address
2) After 5 people have sent one ether, the contract chooses one address at random and sends the ...
- 311
1
vote
1
answer
96
views
Smart Contract GridLock / Stuck Thread
Since Smart Contracts can call multiple contracts, is there a chance that smart contracts enter a gridlock situation?
- 1,954
0
votes
1
answer
65
views
How to be sure registered array/queue are always the same?
I'm trying to a smart-contract where user can register himself (in an sorted array) and when a amount of people is registered (here 2) a Battle is created and firsts registered users battle each other....
- 194