typedef s4u_Semaphore* sg_sem_t;
typedef s4u_NetZone* sg_netzone_t;
typedef s4u_Host* sg_host_t;
typedef s4u_Link* sg_link_t;
typedef s4u_Semaphore* sg_sem_t;
typedef s4u_NetZone* sg_netzone_t;
typedef s4u_Host* sg_host_t;
typedef s4u_Link* sg_link_t;