What marks the end of stack or how does uw_frame_state_for() detect the end of stack? I've a coroutine library and I'm using _Unwind_ForcedUnwind() for stack cleanup. Function _Unwind_ForcedUnwind_Phase2() never sets _URC_END_OF_STACK! any ideas? Oliver -- NEU: FreePhone 3-fach-Flat mit kostenlosem Smartphone! Jetzt informieren: http://mobile.1und1.de/?ac=OM.PW.PW003K20328T7073a