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