#include <sys/time.h>
#include <pthread.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "base.h"
#include "singleton.h"

static Singleton* Singleton_construct(void* addr);

static pthread_once_t once_control = PTHREAD_ONCE_INIT;
static Singleton* singleton = NULL;

Singleton* Singleton_construct(void* addr)
{
    if (addr == NULL) {
        return NULL;
    }

    struct timeval tv;

    int errCode = gettimeofday(&tv, NULL);

    if (errCode) {
        fprintf(stderr, "gettimeofday error. [err=%s]",
                strerror(errCode));
        abort();
    }

    Singleton* singleton = addr;
    singleton->currentTime = tv.tv_sec * 1000000 + tv.tv_usec;

    return singleton;
}

Singleton* getSingleton()
{
    void init() {
        singleton = new(Singleton);

        if (singleton == NULL) {
            fprintf(stderr, "Fail to new singleton.\n");
            abort();
        }
    }

    int errCode = pthread_once(&once_control, init);

    if (errCode) {
        fprintf(stderr, "pthread_once error. [err=%s]",
                strerror(errCode));
        abort();
    }

    return singleton;
}