Fixed compiler warnings

snake.c

@@ -2,6 +2,8 @@
 // Created by snapshot112 on 10/15/25.
 //
 
+#define _POSIX_C_SOURCE 199309
+
 #include "snake.h"
 
 #include <ncurses.h>
@@ -240,8 +242,12 @@ static void update_snake(coordinate new_head, snake_action action) {
 }
 
 static void *snake_move(void *arg) {
+    struct timespec timer;
+    timer.tv_sec = 0;
+    timer.tv_nsec = 250000000L;
+
     while (rooster_vraag_toestand(GRID) == STATE_AAN_HET_SPELEN) {
-        usleep(250000);
+        nanosleep(&timer, NULL);
         pthread_mutex_lock(&MUTEX);
         coordinate new_head = SNAKE_HEAD;
         switch (CURRENT_DIRECTION) {
@@ -332,17 +338,15 @@ void snake(void) {
 
     rooster_zet_toestand(GRID, STATE_AAN_HET_SPELEN);
 
-    // Allow turning before you let the snake move.
-    pthread_create(&user_input, NULL, play_snake, NULL);
-
     while (getch() != ' ') {}
 
     // Cleanup the start playing message.
     mvaddstr(MESSAGE_LOCATION.y, MESSAGE_LOCATION.x, "                                ");
 
+    pthread_create(&user_input, NULL, play_snake, NULL);
     pthread_create(&game_tick, NULL, snake_move, NULL);
 
-    // Cleanup game thread logic.
+    // Wait until the gamestate is no longer STATE_AAN_HET_SPELEN
     pthread_join(game_tick, NULL);
     pthread_join(user_input, NULL);
     pthread_mutex_destroy(&MUTEX);