I am implementing a coroutine scheduler. A thread is interrupted(by SIGURG) regularly to make a switch. I am using swapcontext(from ucontext.h) in sighandler to achieve that. But I found swapcontext doesn't atomically set sigmask and do a long jump. Instead it firstly call sigprocmask and then do a jmp(which I think may cause trouble like signal handler reentry). How can I avoid this?
How to set sigmask and do a long jump atomically in my signal handler?
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