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#include "controller.h"
#include <assert.h>
#include "config.h"
#include "util/lock.h"
#include "util/log.h"
bool
controller_init(struct controller *controller, socket_t control_socket) {
cbuf_init(&controller->queue);
if (!receiver_init(&controller->receiver, control_socket)) {
return false;
}
if (!(controller->mutex = SDL_CreateMutex())) {
receiver_destroy(&controller->receiver);
return false;
}
if (!(controller->msg_cond = SDL_CreateCond())) {
receiver_destroy(&controller->receiver);
SDL_DestroyMutex(controller->mutex);
return false;
}
controller->control_socket = control_socket;
controller->stopped = false;
return true;
}
void
controller_destroy(struct controller *controller) {
SDL_DestroyCond(controller->msg_cond);
SDL_DestroyMutex(controller->mutex);
struct control_msg msg;
while (cbuf_take(&controller->queue, &msg)) {
control_msg_destroy(&msg);
}
receiver_destroy(&controller->receiver);
}
bool
controller_push_msg(struct controller *controller,
const struct control_msg *msg) {
mutex_lock(controller->mutex);
bool was_empty = cbuf_is_empty(&controller->queue);
bool res = cbuf_push(&controller->queue, *msg);
if (was_empty) {
cond_signal(controller->msg_cond);
}
mutex_unlock(controller->mutex);
return res;
}
static bool
process_msg(struct controller *controller,
const struct control_msg *msg) {
static unsigned char serialized_msg[CONTROL_MSG_MAX_SIZE];
int length = control_msg_serialize(msg, serialized_msg);
if (!length) {
return false;
}
int w = net_send_all(controller->control_socket, serialized_msg, length);
return w == length;
}
static int
run_controller(void *data) {
struct controller *controller = data;
for (;;) {
mutex_lock(controller->mutex);
while (!controller->stopped && cbuf_is_empty(&controller->queue)) {
cond_wait(controller->msg_cond, controller->mutex);
}
if (controller->stopped) {
// stop immediately, do not process further msgs
mutex_unlock(controller->mutex);
break;
}
struct control_msg msg;
bool non_empty = cbuf_take(&controller->queue, &msg);
assert(non_empty);
(void) non_empty;
mutex_unlock(controller->mutex);
bool ok = process_msg(controller, &msg);
control_msg_destroy(&msg);
if (!ok) {
LOGD("Could not write msg to socket");
break;
}
}
return 0;
}
bool
controller_start(struct controller *controller) {
LOGD("Starting controller thread");
controller->thread = SDL_CreateThread(run_controller, "controller",
controller);
if (!controller->thread) {
LOGC("Could not start controller thread");
return false;
}
if (!receiver_start(&controller->receiver)) {
controller_stop(controller);
SDL_WaitThread(controller->thread, NULL);
return false;
}
return true;
}
void
controller_stop(struct controller *controller) {
mutex_lock(controller->mutex);
controller->stopped = true;
cond_signal(controller->msg_cond);
mutex_unlock(controller->mutex);
}
void
controller_join(struct controller *controller) {
SDL_WaitThread(controller->thread, NULL);
receiver_join(&controller->receiver);
}
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