msgq: refactor blocking recv for improved robustness and performance #616
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Replaced the previous method of installing, saving, and restoring signal handlers with a more streamlined and standard approach using signal masks (pthread_sigmask, sigtimedwait) for blocking receive operations. This update enhances the consistency and reliability of signal handling, aligning with best practices. It also removes the need for
msgq_poll, thereby improving the efficiency of the receive function.Additionally, a new test case,
test_receive_interrupts_on_sigint, has been added to confirm and verify the functionality of the updated signal handling.Since signal blocking is now managed in the C++ code,
nogilis used in the Cython code to ensure the GIL is released during the execution of the receive function. This prevents it from impacting other Python threads.