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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright (C) 2015 - 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 allocate memory and possibility to exceed pmem kind size."
"\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);
}
// Create PMEM partition with specific size
err = memkind_create_pmem(path, PMEM_MAX_SIZE, &pmem_kind);
if (err) {
print_err_message(err);
return 1;
}
char *pmem_str1 = NULL;
char *pmem_str2 = NULL;
char *pmem_str3 = NULL;
char *pmem_str4 = NULL;
// Allocate 512 Bytes of 32 MB available
pmem_str1 = (char *)memkind_malloc(pmem_kind, 512);
if (pmem_str1 == NULL) {
fprintf(stderr, "Unable to allocate pmem string (pmem_str1).\n");
return 1;
}
// Allocate 8 MB of 31.9 MB available
pmem_str2 = (char *)memkind_malloc(pmem_kind, 8 * 1024 * 1024);
if (pmem_str2 == NULL) {
fprintf(stderr, "Unable to allocate pmem string (pmem_str2).\n");
return 1;
}
// Allocate 16 MB of 23.9 MB available
pmem_str3 = (char *)memkind_malloc(pmem_kind, 16 * 1024 * 1024);
if (pmem_str3 == NULL) {
fprintf(stderr, "Unable to allocate pmem string (pmem_str3).\n");
return 1;
}
// Allocate 16 MB of 7.9 MB available - Out Of Memory expected
pmem_str4 = (char *)memkind_malloc(pmem_kind, 16 * 1024 * 1024);
if (pmem_str4 != NULL) {
fprintf(
stderr,
"Failure, this allocation should not be possible (expected result was NULL).\n");
return 1;
}
sprintf(pmem_str1, "Hello world from pmem - pmem_str1.\n");
sprintf(pmem_str2, "Hello world from pmem - pmem_str2.\n");
sprintf(pmem_str3, "Hello world from persistent memory - pmem_str3.\n");
fprintf(stdout, "%s", pmem_str1);
fprintf(stdout, "%s", pmem_str2);
fprintf(stdout, "%s", pmem_str3);
memkind_free(pmem_kind, pmem_str1);
memkind_free(pmem_kind, pmem_str2);
memkind_free(pmem_kind, pmem_str3);
err = memkind_destroy_kind(pmem_kind);
if (err) {
print_err_message(err);
return 1;
}
fprintf(stdout, "Memory was successfully allocated and released.\n");
return 0;
}
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