wyr-7 opened a new pull request, #3397:
URL: https://github.com/apache/nuttx-apps/pull/3397
…mization
VELAPLATFO-51602
Add a comprehensive test suite to validate the reader-writer semaphore
optimization that reduces unnecessary context switches. The optimization
ensures up_wait() is only called when the lock is actually released
(writer/reader count reaches 0), avoiding premature wake-ups.
Test Coverage:
- Core Correctness Tests (6 tests):
* Multiple readers with no writers (concurrent read access)
* Multiple writers exclusive access verification
* Mixed reader-writer access patterns
* Waiter wake-up correctness
* Lock holder tracking (recursive write lock support)
* Context switch reduction verification
- Performance Tests (3 tests):
* Recursive write lock performance
* Converted lock (read->write) performance
* High contention multi-threaded performance (8 threads)
- Basic Functionality Tests (1 test):
* Basic read/write/recursive lock operations
Key APIs Tested:
- init_rwsem() / destroy_rwsem()
- down_read() / up_read()
- down_write() / up_write()
- Recursive locking behavior
- Lock holder field tracking
This test suite validates commit Id3b49dda0309b098f04e8ab499c28c94fe1f77ce
which optimizes rwsem to reduce context switches in NuttX.
Change-Id: Icabbc9a65e879d6689529d0c8e3aecbdbd9bd6be
*Note: Please adhere to [Contributing
Guidelines](https://github.com/apache/nuttx/blob/master/CONTRIBUTING.md).*
## Summary
*Update this section with information on why change is necessary,
what it exactly does and how, if new feature shows up, provide
references (dependencies, similar problems and solutions), etc.*
## Impact
*Update this section, where applicable, on how change affects users,
build process, hardware, documentation, security, compatibility, etc.*
## Testing
*Update this section with details on how did you verify the change,
what Host was used for build (OS, CPU, compiler, ..), what Target was
used for verification (arch, board:config, ..), etc. Providing build
and runtime logs from before and after change is highly appreciated.*
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