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38 lines
1.4 KiB
38 lines
1.4 KiB
pragma solidity ^0.5.0;
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/**
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* @dev Contract module that helps prevent reentrant calls to a function.
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*
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* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
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* available, which can be applied to functions to make sure there are no nested
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* (reentrant) calls to them.
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*
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* Note that because there is a single `nonReentrant` guard, functions marked as
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* `nonReentrant` may not call one another. This can be worked around by making
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* those functions `private`, and then adding `external` `nonReentrant` entry
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* points to them.
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*/
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contract ReentrancyGuard {
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// counter to allow mutex lock with only one SSTORE operation
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uint256 private _guardCounter;
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constructor () internal {
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// The counter starts at one to prevent changing it from zero to a non-zero
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// value, which is a more expensive operation.
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_guardCounter = 1;
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}
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/**
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* @dev Prevents a contract from calling itself, directly or indirectly.
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* Calling a `nonReentrant` function from another `nonReentrant`
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* function is not supported. It is possible to prevent this from happening
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* by making the `nonReentrant` function external, and make it call a
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* `private` function that does the actual work.
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*/
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modifier nonReentrant() {
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_guardCounter += 1;
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uint256 localCounter = _guardCounter;
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_;
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require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call");
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}
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}
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