XBT_PUBLIC void TRACE_host_push_state(const char* host, const char* state, const char* value);
XBT_PUBLIC void TRACE_host_pop_state(const char* host, const char* state);
XBT_PUBLIC void TRACE_host_push_state(const char* host, const char* state, const char* value);
XBT_PUBLIC void TRACE_host_pop_state(const char* host, const char* state);