29 lines
878 B
Solidity
29 lines
878 B
Solidity
pragma solidity ^0.4.8;
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/// @title Helps contracts guard agains rentrancy attacks.
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/// @author Remco Bloemen <remco@2π.com>
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/// @notice If you mark a function `nonReentrant`, you should also
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/// mark it `external`.
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contract ReentrancyGuard {
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/// @dev We use a single lock for the whole contract.
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bool private rentrancy_lock = false;
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/// Prevent contract from calling itself, directly or indirectly.
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/// @notice If you mark a function `nonReentrant`, you should also
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/// mark it `external`. Calling one nonReentrant function from
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/// another is not supported. Instead, you can implement a
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/// `private` function doing the actual work, and a `external`
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/// wrapper marked as `nonReentrant`.
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modifier nonReentrant() {
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if(rentrancy_lock == false) {
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rentrancy_lock = true;
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_;
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rentrancy_lock = false;
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} else {
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throw;
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}
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}
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}
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