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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright (C) 2018 - 2021 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);
int status = memkind_check_dax_path(path);
if (!status) {
fprintf(stdout, "PMEM kind %s is on DAX-enabled file system.\n", path);
} else {
fprintf(stdout, "PMEM kind %s is not on DAX-enabled file system.\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;
}
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