Windows fibers and the fibers Gor Nishanov rants about as being bad in C++ have very little to do with user-mode threads in managed runtimes like Java or Go des

Windows fibers and the fibers Gor Nishanov rants about as being bad in C++ have very little to do with user-mode threads in managed runtimes like Java or Go despite sharing superficial similarities. In particular, a managed runtime knows exactly how code uses the stack and understands its representation, and Java does not have pointers into the stack. This means that stacks can be moved and resized very, very cheaply. The constraints and capabilities that matter the most simply don't transfer from one language or environment to another.