Zelda64Recomp/ultramodern/scheduling.cpp

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#include "ultramodern.hpp"
void ultramodern::run_next_thread(RDRAM_ARG1) {
if (thread_queue_empty(PASS_RDRAM running_queue)) {
throw std::runtime_error("No threads left to run!\n");
}
OSThread* to_run = TO_PTR(OSThread, thread_queue_pop(PASS_RDRAM running_queue));
debug_printf("[Scheduling] Resuming execution of thread %d\n", to_run->id);
to_run->context->running.signal();
}
void ultramodern::schedule_running_thread(RDRAM_ARG PTR(OSThread) t_) {
debug_printf("[Scheduling] Adding thread %d to the running queue\n", TO_PTR(OSThread, t_)->id);
thread_queue_insert(PASS_RDRAM running_queue, t_);
TO_PTR(OSThread, t_)->state = OSThreadState::QUEUED;
}
void ultramodern::check_running_queue(RDRAM_ARG1) {
// Check if there are any threads in the running queue.
if (!thread_queue_empty(PASS_RDRAM running_queue)) {
// Check if the highest priority thread in the queue is higher priority than the current thread.
OSThread* next_thread = TO_PTR(OSThread, ultramodern::thread_queue_peek(PASS_RDRAM running_queue));
OSThread* self = TO_PTR(OSThread, ultramodern::this_thread());
if (next_thread->priority > self->priority) {
ultramodern::thread_queue_pop(PASS_RDRAM running_queue);
// Swap to the higher priority thread.
ultramodern::swap_to_thread(PASS_RDRAM next_thread);
}
}
}
void ultramodern::swap_to_thread(RDRAM_ARG OSThread *to) {
debug_printf("[Scheduling] Thread %d giving execution to thread %d\n", TO_PTR(OSThread, ultramodern::this_thread())->id, to->id);
// Insert this thread in the running queue.
thread_queue_insert(PASS_RDRAM running_queue, ultramodern::this_thread());
TO_PTR(OSThread, ultramodern::this_thread())->state = OSThreadState::QUEUED;
// Unpause the target thread and wait for this one to be unpaused.
ultramodern::resume_thread(to);
ultramodern::wait_for_resumed(PASS_RDRAM1);
}
void ultramodern::wait_for_resumed(RDRAM_ARG1) {
TO_PTR(OSThread, ultramodern::this_thread())->context->running.wait();
// If this thread was marked to be destroyed by another thre, destroy it again from its own context.
// This will actually destroy the thread instead of just marking it to be destroyed.
if (TO_PTR(OSThread, ultramodern::this_thread())->destroyed) {
osDestroyThread(PASS_RDRAM NULLPTR);
}
}
void ultramodern::resume_thread(OSThread *t) {
if (t->state != OSThreadState::QUEUED) {
assert(false && "Threads should only be resumed from the queued state!");
}
t->state = OSThreadState::RUNNING;
t->context->running.signal();
}
extern "C" void pause_self(RDRAM_ARG1) {
while (true) {
// Wait until an external message arrives, then allow the next thread to run.
ultramodern::wait_for_external_message(PASS_RDRAM1);
ultramodern::check_running_queue(PASS_RDRAM1);
}
}