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#include "time.hpp"
#include "sched.hpp"
#include "packet.hpp"
extern "C" {
#include "log.h"
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
}
using namespace std;
#define SCHED_SLEEPING 1
#define SCHED_BURST 2
#define SCHED_IDLE 3
scheduler::scheduler()
{
state = SCHED_IDLE;
sleep_threshold = (1LL<<32)/10;
scheduled_classid = -1;
bw_adm = 0;
total_bytes = total_packets = 0;
}
scheduler::~scheduler()
{
}
int scheduler::send(generic_packet *packet)
{
int result;
result = fsm();
if( result==-1 ) {
return -1;
}
result = __send(packet);
if( result==-1 ) {
return -1;
}
return 0;
}
int scheduler::can_send()
{
int result;
result = fsm();
if( result==-1 ) {
return -1;
}
if( state!=SCHED_IDLE && state!=SCHED_BURST ) {
return 0;
}
return 1;
}
int scheduler::is_sleeping()
{
int result;
result = fsm();
if( result==-1 ) {
return -1;
}
if( state!=SCHED_SLEEPING ) {
return 0;
}
return usleep;
}
int scheduler::fsm_burst()
{
u_int64_t now = ck();
u_int64_t dt = burst_end - now;
if( burst_end <= now) {
state = SCHED_IDLE;
return 0;
} else if( dt > sleep_threshold ) {
state = SCHED_SLEEPING;
usleep = to_usec(dt);
log_info(LL_ERR,
"scheduler::fsm_burst() warning: "
"inconsistent fsm state, usleep=%d {%s:%d}",
usleep, __FILE__, __LINE__);
return 0;
} else {
return 0;
}
}
int scheduler::fsm_sleeping()
{
u_int64_t now = ck();
u_int64_t dt = burst_end - now;
if( burst_end <= now ) {
state = SCHED_IDLE;
return 0;
} else if( dt > sleep_threshold ) {
state = SCHED_SLEEPING;
usleep = to_usec(dt);
return 0;
} else {
state = SCHED_BURST;
burst_start = now;
return 0;
}
}
int scheduler::fsm()
{
int result;
switch(state) {
case SCHED_IDLE:
result = 0;
break;
case SCHED_BURST:
result = fsm_burst();
break;
case SCHED_SLEEPING:
result = fsm_sleeping();
break;
default:
log_info(LL_ALERT, "invalid fsm state {%s:%d}",
__FILE__, __LINE__);
result = -1;
break;
}
return result;
}
// handles low-level stuff
int scheduler::__send(generic_packet *packet)
{
int result;
u_int64_t dt, now;
if( state!=SCHED_IDLE && state!=SCHED_BURST ) {
log_info(LL_ERR, "scheduler::__send() can't transmit in this "
"state (%d) {%s:%d}", state, __FILE__, __LINE__);
return -1;
}
result = bw_adm->getbw(scheduled_classid, packet->payload_size, &dt);
if( result==1 ) {
log_info(LL_DEBUG1, "dropping packet (class' bw=0) {%s:%d}",
__FILE__, __LINE__);
return 0;
}
now = ck();
if( state==SCHED_IDLE ) {
state = SCHED_BURST;
burst_start = now;
burst_end = now + dt;
} else {
burst_end += dt;
}
if( burst_end > now ) {
u_int64_t burst_left = burst_end - now;
if( burst_left > sleep_threshold ) {
state = SCHED_SLEEPING;
usleep = to_usec(burst_left);
}
}
result = packet->send_back();
if( result==-1 ) {
return -1;
}
total_packets++;
total_bytes += packet->payload_size;
return 0;
}
void scheduler::set_classid(int id)
{
scheduled_classid = id;
}
void scheduler::set_bwadm(bwadm *ptr)
{
bw_adm = ptr;
}
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