sched_yield(): 2108 cycles ucontext_t: 1795 cycles fcontext_t: 156 cycles
Actually it is quite consistent with what you had show, the Boost.Context is better (but not significantly) then real OS (kernel) context switch.
factor 13x ?
It would be very useful to see real usability cases. Because otherwise it is hard to estimate usefulness of this library
The lib is intended to be a building block for higher abstractions like coroutines.
I understand, it may be useful for "yeild" like iterators and so but it is not clear how does it work and what is the advantage in comparison to ordinary event driven approach.
I remember that factor (http://factorcode.org/) does context switching for its internal working. You can preserve local data: void myfunc() { std::string s = "abc"; for ( int i = 0; i< 10; ++i) { if ( 5 == i) // jump out to another code path not related to myfunc() // and preserve value of i and s yield(); // if we jumped back we return from yield i==5, s == "abc" } } reagrds, Oliver -- GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit gratis Handy-Flat! http://portal.gmx.net/de/go/dsl