return static value without locking #634
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Sequence Diagram(s)sequenceDiagram
participant Client
participant ValueEvaluator
participant StaticValues
Client->>ValueEvaluator: Request value evaluation
ValueEvaluator->>StaticValues: Check if static value exists
alt Static value exists
ValueEvaluator-->>Client: Return static value
else
ValueEvaluator->>ValueEvaluator: Acquire lock
ValueEvaluator-->>Client: Compute and return dynamic value
ValueEvaluator->>ValueEvaluator: Release lock
end
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Actionable comments posted: 1
Review details
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Files selected for processing (1)
- shared/public/Value.h (4 hunks)
Additional comments not posted (2)
shared/public/Value.h (2)
47-48: Approved addition of<shared_mutex>and<atomic>headers.These headers support the necessary atomic operations and potential shared locking mechanisms, aligning with the PR's objectives to enhance thread safety.
766-766: Approved conversion ofisStatictostd::atomic<bool>.This change ensures that updates to the
isStaticflag are atomic, enhancing thread safety in multi-threaded environments.
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| std::lock_guard<std::mutex> lock(mutex); |
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Tip
Codebase Verification
Repositioning of std::lock_guard<std::mutex> introduces potential race conditions.
The lock is now acquired after checking isStatic and staticValue, which could lead to race conditions if these variables are accessed concurrently by multiple threads. It is crucial to ensure that these checks are protected by the mutex to prevent any data races.
- Location:
shared/public/Value.h- Lines: 718-718
Analysis chain
Conditionally approved repositioning of std::lock_guard<std::mutex>.
Repositioning the lock to occur after checking staticValue and isStatic can potentially reduce lock contention. However, ensure that this change does not introduce race conditions by improperly sequencing checks and mutations.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Verify proper sequencing of checks and mutations related to `isStatic` and `staticValue`.
# Test: Search for usage patterns of `isStatic` and `staticValue` to ensure safe access.
rg --type cpp --multiline 'if \(isStatic.load\(\)\) \{\n.*\n.*std::lock_guard<std::mutex>'
Length of output: 92
Script:
#!/bin/bash
# Description: Verify all occurrences of `isStatic` and `staticValue` and their respective locking mechanisms.
# Search for all instances of `isStatic` and check if they are properly guarded by a mutex lock.
rg --type cpp --multiline 'isStatic' -A 5 -B 5
# Search for all instances of `staticValue` and check if they are properly guarded by a mutex lock.
rg --type cpp --multiline 'staticValue' -A 5 -B 5
Length of output: 4361
It should still be thread save since isStatic is set atomically after the staticValue is set.
Summary by CodeRabbit