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There have been userspace thread libraries for c++ for decades.

• yosefk 5y ago
  Sure, I wrote some myself. Q is what libraries you can use on top of the userspace thread package that are aware of the userspace threads rather than just using OS APIs and thus eg blocking the current OS thread.
  • gpderetta 5y ago
    There are .so interposition tricks that can be used for that. I think Pth used to do that for example.
    • yosefk 5y ago
      Could you elaborate?
      • gpderetta 5y ago
        For example: https://www.gnu.org/software/pth/pth-manual.html#system_call_wrapper_facility https://www.gnu.org/software/pth/pth-manual.html#system_call... See the hard system call wrapping. This is just one option.