void *buffer_thread(){
PID pid;
PacketDescriptor p1;
while(1){
p1 = blockingReadBB(buffer);
pid = packet_descriptor_get_pid(&p1);
blockingWriteBB(incoming[pid], p1);
}
return NULL;
}
static void* writeThreadRun(void* args) {
while(1) {
struct voucher* v = (struct voucher*) blockingReadBB(readVoucherBuffer);
int status = write_sector(diskDevice, &(v->sector));
pthread_mutex_lock(&(v->voucherMutex));
v->status = status;
pthread_cond_signal(&(v->voucherCond));
pthread_mutex_unlock(&(v->voucherMutex));
}
pthread_exit(NULL);
}
void *sending_thread(){
int i;
PacketDescriptor pd;
int r;
int sleep;
while (1){
pd = blockingReadBB(outgoing);
for (i=0;i<10;i++){
if ((send_packet(netdev, pd)) == 1){
break;
}
r=random();
sleep = (unsigned int) r; //casting to unsigned removes any negative numbers
sleep = sleep % powers(2,i); // limits it to the desired range//
usleep(sleep); //I believe this code is waiting a random time in the range 0-(2 to the power i) microseconds
}
blocking_put_pd(fpds, pd);
}
return NULL;
}
/* Neither call should delay until the packet is actually sent */
void blocking_get_packet(PacketDescriptor* pd, PID pid){ // a way for applications to definitely get packets from their respective "cubbyholes"
*pd = blockingReadBB(incoming[pid]);
return;
}
