#include <stdio.h>
#include <SDL2/SDL.h>


SDL_mutex *s_lock = NULL;
SDL_cond *s_cond = NULL;

int work_thread(void *arg) {
    SDL_LockMutex(s_lock);
    printf("<=========work_thread sleep=========>\n");
    sleep(10);
    printf("<=========work_thread wait condition=========>\n");
    SDL_CondWait(s_cond, s_lock);
    printf("<=========work_thread receive signal=========>\n");
    printf("<=========work_thread end=========>\n");
    SDL_UnlockMutex(s_lock);

    return 0;
}

#undef main
int main()
{
    s_lock = SDL_CreateMutex();
    s_cond = SDL_CreateCond();
    SDL_Thread *t = SDL_CreateThread(work_thread, "work_thread", NULL);

    if (!t) {
        printf("SDL_CreateThread() failed\n");
        return -1;
    }

    for (int i = 0; i < 2; i++) {
        sleep(2);
        printf("main execute\n");
    }

    printf("SDL_LockMutex(s_lock) before\n");
    SDL_LockMutex(s_lock);
    printf("SDL_LockMutex(s_lock) after\n");
    printf("SDL_CondSignal(s_cond) before\n");
    SDL_CondSignal(s_cond);
    printf("SDL_CondSignal(s_cond) after\n");
    sleep(10);
    printf("SDL_UnlockMutex(s_lock) before\n");
    SDL_UnlockMutex(s_lock);
    printf("SDL_UnlockMutex(s_lock) after\n");

    SDL_WaitThread(t, NULL);
    SDL_DestroyMutex(s_lock);
    SDL_DestroyCond(s_cond);

    return 0;
}