// SPDX-License-Identifier: BSD-3-Clause

/* Copyright (C) 2018 - 2020 Intel Corporation. */

#include <memkind.h>

#include <limits.h>

#include <stdio.h>

#include <stdlib.h>

#define PMEM_MAX_SIZE (1024 * 1024 * 32)

static char path[PATH_MAX] = "/tmp/";

static void print_err_message(int err)

{

    char error_message[MEMKIND_ERROR_MESSAGE_SIZE];

    memkind_error_message(err, error_message, MEMKIND_ERROR_MESSAGE_SIZE);

    fprintf(stderr, "%s\n", error_message);

}

int main(int argc, char *argv[])

{

    struct memkind *pmem_kind = NULL;

    int err = 0;

    if (argc > 2) {

        fprintf(stderr, "Usage: %s [pmem_kind_dir_path]\n", argv[0]);

        return 1;

    } else if (argc == 2 && (realpath(argv[1], path) == NULL)) {

        fprintf(stderr, "Incorrect pmem_kind_dir_path %s\n", argv[1]);

        return 1;

    }

    fprintf(stdout,

            "This example shows how to use memkind alignment and how it affects allocations.\nPMEM kind directory: %s\n",

            path);

    err = memkind_create_pmem(path, PMEM_MAX_SIZE, &pmem_kind);

    if (err) {

        print_err_message(err);

        return 1;

    }

    char *pmem_str10 = NULL;

    char *pmem_str11 = NULL;

    // Perform two allocations - 32 bytes

    pmem_str10 = (char *)memkind_malloc(pmem_kind, 32);

    if (pmem_str10 == NULL) {

        fprintf(stderr, "Unable to allocate pmem string (pmem_str10).\n");

        return 1;

    }

    pmem_str11 = (char *)memkind_malloc(pmem_kind, 32);

    if (pmem_str11 == NULL) {

        fprintf(stderr, "Unable to allocate pmem string (pmem_str11)\n");

        return 1;

    }

    // The allocations should be very close to each other in memory

    if (pmem_str11 - pmem_str10 != 32) {

        fprintf(stderr, "Something went wrong with allocations.\n");

        return 1;

    }

    memkind_free(pmem_kind, pmem_str10);

    memkind_free(pmem_kind, pmem_str11);

    // Perform two allocations - 32 bytes with alignment 64

    err = memkind_posix_memalign(pmem_kind, (void **)&pmem_str10, 64, 32);

    if (err) {

        fprintf(stderr,

                "Unable to allocate pmem string (pmem_str10) with alignment.\n");

        return 1;

    }

    err = memkind_posix_memalign(pmem_kind, (void **)&pmem_str11, 64, 32);

    if (err) {

        fprintf(stderr,

                "Unable to allocate pmem string (pmem_str11) with alignment.\n");

        return 1;

    }

    // The addresses of allocations are not close to each other in memory, they are aligned to 64

    if (pmem_str11 - pmem_str10 != 64) {

        fprintf(stderr, "Something went wrong with alignment allocations.\n");

        return 1;

    }

    memkind_free(pmem_kind, pmem_str10);

    memkind_free(pmem_kind, pmem_str11);

    err = memkind_destroy_kind(pmem_kind);

    if (err) {

        print_err_message(err);

        return 1;

    }

    fprintf(stdout,

            "The memory has been successfully allocated using memkind alignment.\n");

    return 0;

}