Hi, I've uploaded an alternative version to boost vault (boost.context-alternative_version.zip : http://tinyurl.com/6fpnkro). The documentation is available at http://ok73.ok.funpic.de/alternative/boost/libs/context/doc/html/. changes: - fixed bug for x86_64/sysv/elf assembler file: missing assembler directive .type added - as suggested by Artyom and Vicente: - assembler implementation and native implementation of context switching functions compiled and applied as template arg to context<> -> context<> == context< protected_stack, asm_impl > on UNIX, context< protected_stack, native_impl > on Windows - for Windows assembler implementation is disabled Oliver