void asyncRead (char* buf, int nbytes, int blockno, void (*handler) (char*, int, int)) {
// call disk_scheduleRead to schedule a read TODO
struct PendingRead* PR = malloc(sizeof *PR);
PR->buf = buf;
PR->nbytes = nbytes;
PR->blockno = blockno;
PR->handler = handler;
queue_enqueue (&prq, PR);
disk_scheduleRead (buf, nbytes, blockno);
disk_waitForReads ();
}
void* readAndHandleBlock (void* args_voidstar) {
// TODO
// Synchronously:
// (1) call disk_scheduleRead to request the block
// (2) wait read for it to complete
// (3) call handleRead
struct readAndHandleBlockArgs* obj = args_voidstar;
disk_scheduleRead(obj->buf,obj->nbytes,obj->blockno); //call disk_scheduleRead to request the block
blockUntilComplete();
handleRead(obj->buf,obj->nbytes,obj->blockno);
free(obj->buf);
free(obj); //how do we get the information after the reading
return NULL;
// read first, because it takes time to read so we block it first. And then
// when it finishes reading, we unblock it and put it into a queue. We call interrupt service
// routine to handle the data
}
void syncRead (char* buf, int nBytes, int blockNo) {
disk_scheduleRead (buf, 4096, blockNo);
disk_waitForReads ();
assert (*((int*) buf) == blockNo);
}
