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Many virtual machines, including Go VM, depend on signals using
SA_ONSTACK. This flag allows a thread to define a new alternate signal stack. Many argue thatSA_ONSTACKshould be a default, but it's not the case (yet).This patch sets the
SA_ONSTACKflag when C-Thread-Pool callssigaction().Python merged a similar patch (python/cpython#24730) in 2021 (Python 3.10+) for the same reasons, and I did a similar patch for PHP, with no issues.