void irq_subscribe(uint8_t irq)
{
if (irq == 0) return;
Thread* current = scheduler_current();
if (!irqThread[irq])
{
irq_register(irq, irq_notify);
irqThread[irq] = current->tid;
}
}
void irq_wait(uint8_t irq)
{
Thread* current = scheduler_current();
if (irqThread[irq] != current->tid) return;
if (irqPending[current->waitingIrq])
irqPending[current->waitingIrq] = false;
else
{
current->waitingIrq = irq;
scheduler_wait(0, WAIT_RECEIVING);
}
}
void send_receive(uint16_t to, uint16_t from)
{
Thread *sender, *receiver, *current = scheduler_current();
if (to)
{
receiver = thread_get(to);
if (receiver->state != WAIT_RECEIVING ||
!(receiver->waitingFor == (uint16_t)-1 ||
receiver->waitingFor == current->tid))
{
if (from)
return scheduler_wait(to, WAIT_SEND_RECV);
else
return scheduler_wait(to, WAIT_SENDING);
}
deliver(current, receiver);
scheduler_unblock(receiver);
}
if (from)
{
if (!list_empty(¤t->waitingList))
{
sender = list_item(list_pop(¤t->waitingList), Thread, queueLink);
deliver(sender, current);
if (sender->state == WAIT_SENDING)
scheduler_unblock(sender);
else
sender->state = WAIT_RECEIVING;
}
else
scheduler_wait(from, WAIT_RECEIVING);
}
return;
}
/**
* Changes the priority of the the process that calls nice.
*
* @param priority, the new priority.
* @return the new priority.
*/
int _nice(int priority) {
struct Process* proc = scheduler_current();
proc->schedule.priority = priority;
return proc->schedule.priority;
}
/**
* Blocks the process a certain amount of time.
*
* @param seconds, the quantity of seconds to be blocked.
*/
void _sleep(int seconds) {
scheduler_sleep(scheduler_current(), seconds);
}
/**
* Waits for a child process to finish its execution.
*
* @return the pid of the child that has finished.
*/
pid_t _wait(void) {
return process_table_wait(scheduler_current());
}
/**
* Finishes the process in a clean way.
*/
void _exit(void) {
process_table_exit(scheduler_current());
}
/**
* Runs a new process.
*
* @param entrypoint, the entrypoint of the new process.
* @param args, the arguments that the new process receives.
* @param active, if the process runs on foreground.
* @return the process id of the new process.
*/
pid_t _run(EntryPoint entryPoint, char* args, int active) {
struct Process* parent = scheduler_current();
struct Process* p = process_table_new(entryPoint, args, parent, 0, parent->terminal, active);
return p->pid;
}
/**
* Gets the process id of the parent.
*
* @return the process id of the parent.
*/
pid_t _getppid(void) {
return scheduler_current()->ppid;
}