/**
* Switches the CPU's active thread context to that of the specified thread
* @param new_thread The thread to switch to
*/
static void SwitchContext(Thread* new_thread) {
DEBUG_ASSERT_MSG(new_thread->status == THREADSTATUS_READY, "Thread must be ready to become running.");
Thread* previous_thread = GetCurrentThread();
// Save context for previous thread
if (previous_thread) {
Core::g_app_core->SaveContext(previous_thread->context);
if (previous_thread->status == THREADSTATUS_RUNNING) {
// This is only the case when a reschedule is triggered without the current thread
// yielding execution (i.e. an event triggered, system core time-sliced, etc)
ready_queue.push_front(previous_thread->current_priority, previous_thread);
previous_thread->status = THREADSTATUS_READY;
}
}
// Load context of new thread
if (new_thread) {
current_thread = new_thread;
ready_queue.remove(new_thread->current_priority, new_thread);
new_thread->status = THREADSTATUS_RUNNING;
Core::g_app_core->LoadContext(new_thread->context);
} else {
current_thread = nullptr;
}
}
/// Change a thread to "ready" state
void ChangeReadyState(Thread* t, bool ready) {
Handle handle = t->GetHandle();
if (t->IsReady()) {
if (!ready) {
g_thread_ready_queue.remove(t->current_priority, handle);
}
} else if (ready) {
if (t->IsRunning()) {
g_thread_ready_queue.push_front(t->current_priority, handle);
} else {
g_thread_ready_queue.push_back(t->current_priority, handle);
}
t->status = THREADSTATUS_READY;
}
}