You've used thread_local for the sigjmp_buf. Are you sure the mechanism used by thread_local is safe to use in a signal handler? Relevant bug from Rust: "TLS

You've used thread_local for the sigjmp_buf. Are you sure the mechanism used by thread_local is safe to use in a signal handler? Relevant bug from Rust: "TLS accesses aren't async-signal-safe", https://github.com/rust-lang/rust/issues/43146 https://github.com/rust-lang/rust/issues/43146 I'm thinking even if it works on certain OSes, it's not guaranteed, because a signal handler's context is not a thread context - or is it? E.g. the thread_local mechanism might depend on compile-time options (affecting how thread_local, whether it allocates memory on demand, and how it relocates the memory block when loading a shared library), whether it's main program or an -fPIC shared library, and the type of thread library (different ways of implementing pthreads).