-// ========== MSG Layer ==============
-typedef struct s_msg_host_priv *msg_host_priv_t;
-msg_host_priv_t sg_host_msg(sg_host_t host);
-XBT_PUBLIC(void) sg_host_msg_set(sg_host_t host, msg_host_priv_t priv);
-
-// ========== Simix layer =============
-XBT_PUBLIC(smx_host_priv_t) sg_host_simix(sg_host_t host);
-