dongjiuzhu1
291199f833
When a thread is terminated via pthread_exit() while blocked in epoll_wait(), the file reference taken at the beginning of epoll_wait() is not properly released, leading to resource leaks. Problem scenario found during libuv test: 1. Echo server thread is blocked in epoll_wait() 2. Main task sends pthread_kill signal to the server thread 3. Signal handler calls pthread_exit() to terminate the thread 4. epoll_wait() is interrupted before reaching the file_put() call 5. The epoll fd reference count remains elevated 6. epoll_do_close() is never called, leaving fds in internal queues 7. File descriptors leak Solution: Register a TLS (Thread Local Storage) cleanup handler using tls_cleanup_push() at the beginning of epoll_wait() blocking section. This ensures that if the thread exits abnormally (via pthread_exit, pthread_cancel, etc.), the cleanup handler (epoll_cleanup) will be called automatically to release the file reference via file_put(). The cleanup handler is properly paired with tls_cleanup_pop() when epoll_wait() completes normally, ensuring the handler is only invoked on abnormal exit. This fix is applied to both epoll_wait() code paths (with and without extended mode) to ensure consistent behavior. Impact: - Prevents epoll fd reference count leaks on thread cancellation - Ensures proper cleanup even when epoll_wait() is interrupted by pthread_exit - Critical for multi-threaded applications using signals and thread termination - Works together with previous fix for teardown/oneshot list cleanup Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
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