void *buffer_thread(){
PID pid;
PacketDescriptor p1;
while(1){
p1 = blockingReadBB(buffer);
pid = packet_descriptor_get_pid(&p1);
blockingWriteBB(incoming[pid], p1);
}
return NULL;
}
void blocking_read_sector(SectorDescriptor sd, Voucher *v) {
struct voucher* vouch = (struct voucher*) malloc(sizeof(struct voucher));
vouch->sector = sd;
vouch->status = -1;
vouch->type = READ_REQ;
pthread_mutex_init(&(vouch->voucherMutex), NULL);
pthread_cond_init(&(vouch->voucherCond), NULL);
*v = (Voucher) vouch;
blockingWriteBB(readVoucherBuffer, *v);
}
//the 4 methods for read/write are very similar, so i only comment this one
void blocking_write_sector(SectorDescriptor sd, Voucher *v) {
struct Voucher* vouch = (struct Voucher*) malloc(sizeof(struct Voucher)); //create a new voucher
vouch->sector = sd; //initialise with sd that will be read/written
vouch->status = -1; //initial status flag
vouch->type = WRITE; //its of type write
pthread_mutex_init(&(vouch->vouchMut), NULL); //initiate mutex
pthread_cond_init(&(vouch->vouchCond), NULL); //initate condition variable
*v = (Voucher) vouch; //return the created voucher inside v provided
blockingWriteBB(writeBuffer, *v); //does a blocking add to the write buffer
}
void blocking_read_sector(SectorDescriptor sd, Voucher *v) {
struct Voucher* vouch = (struct Voucher*) malloc(sizeof(struct Voucher));
pthread_mutex_init(&(vouch->vouchMut), NULL);
pthread_cond_init(&(vouch->vouchCond), NULL);
vouch->sector = sd;
vouch->status = -1;
vouch->type = READ;
*v = (Voucher) vouch;
blockingWriteBB(readBuffer, *v); //does a blocking add to the read buffer
}
void blocking_send_packet(PacketDescriptor pd){//a way for applications to queue up their packets to be sent
blockingWriteBB(outgoing, pd);
return;
}
