void TX()
{
//dequeue out_q to write to port
char ch = '\0'; //Nul, '\0'
ch = MsgDeQ(&port_data.echo_buffer); //******************echo_buffer????********
if((&port_data.echo_buffer !=0)//if echo buffer of port data is not empty
{
ch = MsgDeQ(&port_data.echo_buffer)); //ch = dequeue from echo buffer
}
void MsgRcvISR(msg_t *p)
{
if(!MsgEmptyQ(&(mboxes[cur_pid].msg_q)))
MsgDeQ(p, &(mboxes[cur_pid].msg_q));
else
{
EnQ(cur_pid, &(mboxes[cur_pid].wait_q));
pcbs[cur_pid].state = WAIT;
cur_pid = -1;
}
}
void MsgRcvISR(int msg_addr) {
msg_t *receiving_msg_ptr, *queued_msg_ptr;
int msg_q_id;
receiving_msg_ptr = (msg_t*)msg_addr;
msg_q_id = receiving_msg_ptr->recipient;
if (msg_q[msg_q_id].len > 0) {
queued_msg_ptr = MsgDeQ(&msg_q[msg_q_id]);
*receiving_msg_ptr = *queued_msg_ptr;
}else {
EnQ( running_pid, &msg_q[msg_q_id].wait_q);
pcb[running_pid].state = WAIT;
running_pid=-1;
}
}
void MsgRcvISR(int msg_addr)
{
int msg_q_id;
msg_t *receiving_msg_ptr, *queued_msg_ptr;
receiving_msg_ptr = (msg_t *) msg_addr; //set 1st abot to point to msg space
msg_q_id = receiving_msg_ptr->recipient;
if(msg_q[msg_q_id].len > 0)
{
queued_msg_ptr = MsgDeQ(&(msg_q[msg_q_id]));
*receiving_msg_ptr = *queued_msg_ptr;
return;
}
else
{
EnQ(running_pid, &msg_q[msg_q_id].wait_q);
pcb[running_pid].state = WAIT;
running_pid = -1;
}
}
void MsgRcvISR()
{
int mid;
msg_t *dest, *src;
mid = cur_pid; // private mbox only now
dest = (msg_t *)pcbs[cur_pid].tf_p->eax; // eax since MsgRcv changed
if(MsgEmptyQ(&mboxes[mid].msg_q))
{
EnQ(cur_pid, &mboxes[mid].wait_q);
pcbs[cur_pid].state = WAIT;
cur_pid = -1;
}
else
{
src = MsgDeQ(&mboxes[mid].msg_q);
*dest = *src;
}
}
void MsgRcvISR(int msg_addr)
{
int msg_q_id;
msg_t *receiving_msg_ptr, *queued_msg_ptr;
receiving_msg_ptr = (msg_t *) msg_addr; //set 1st abot to point to msg space
msg_q_id = receiving_msg_ptr->recipient; // *************
if(msg_q[msg_q_id].len > 0)
{
queued_msg_ptr = MsgDeQ(&(msg_q[msg_q_id]));
*receiving_msg_ptr = *queued_msg_ptr;
return;
}
else
{
cons_printf("MsgRcvISR: BLOCKING process # %d !\n", running_pid);
EnQ(running_pid, &msg_q[msg_q_id].wait_q);
pcb[running_pid].state = WAIT;
running_pid = -1;
}
}
