The implementation uses fcontext_t per default. fcontext_t is based on assembler and not available for all platforms. It provides a much better performance than ucontext_t (the context switch takes two magnitudes of order less CPU cycles) and WinFiber.
As an alternative, ucontext_t
can be used by compiling with
and b2 property
ucontext_t might be available on a broader range of
POSIX-platforms but has some (for instance deprecated since POSIX.1-2003,
not C99 conform).
call/cc supports Segmented stacks only with ucontext_t as its implementation.
Win32-Fibers are used as implementation for call/cc.
Because the TIB (thread information block) is not fully described in the MSDN, it might be possible that not all required TIB-parts are swapped.
The first call of call/cc converts the thread into
a Windows fiber by invoking