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// SPDX-License-Identifier: BSD-3-Clause
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/* Copyright (C) 2015 - 2020 Intel Corporation. */
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#include <memkind.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define PMEM_MAX_SIZE (1024 * 1024 * 32)
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static char path[PATH_MAX]="/tmp/";
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static void print_err_message(int err)
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{
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char error_message[MEMKIND_ERROR_MESSAGE_SIZE];
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memkind_error_message(err, error_message, MEMKIND_ERROR_MESSAGE_SIZE);
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fprintf(stderr, "%s\n", error_message);
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}
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int main(int argc, char *argv[])
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{
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struct memkind *pmem_kind = NULL;
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int err = 0;
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if (argc > 2) {
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fprintf(stderr, "Usage: %s [pmem_kind_dir_path]\n", argv[0]);
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return 1;
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} else if (argc == 2 && (realpath(argv[1], path) == NULL)) {
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fprintf(stderr, "Incorrect pmem_kind_dir_path %s\n", argv[1]);
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return 1;
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}
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fprintf(stdout,
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"This example shows how to allocate memory and possibility to exceed pmem kind size."
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"\nPMEM kind directory: %s\n", path);
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// Create PMEM partition with specific size
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err = memkind_create_pmem(path, PMEM_MAX_SIZE, &pmem_kind);
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if (err) {
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print_err_message(err);
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return 1;
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}
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char *pmem_str1 = NULL;
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char *pmem_str2 = NULL;
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char *pmem_str3 = NULL;
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char *pmem_str4 = NULL;
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// Allocate 512 Bytes of 32 MB available
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pmem_str1 = (char *)memkind_malloc(pmem_kind, 512);
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if (pmem_str1 == NULL) {
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fprintf(stderr, "Unable to allocate pmem string (pmem_str1).\n");
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return 1;
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}
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// Allocate 8 MB of 31.9 MB available
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pmem_str2 = (char *)memkind_malloc(pmem_kind, 8 * 1024 * 1024);
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if (pmem_str2 == NULL) {
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fprintf(stderr, "Unable to allocate pmem string (pmem_str2).\n");
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return 1;
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}
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// Allocate 16 MB of 23.9 MB available
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pmem_str3 = (char *)memkind_malloc(pmem_kind, 16 * 1024 * 1024);
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if (pmem_str3 == NULL) {
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fprintf(stderr, "Unable to allocate pmem string (pmem_str3).\n");
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return 1;
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}
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// Allocate 16 MB of 7.9 MB available - Out Of Memory expected
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pmem_str4 = (char *)memkind_malloc(pmem_kind, 16 * 1024 * 1024);
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if (pmem_str4 != NULL) {
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fprintf(stderr,
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"Failure, this allocation should not be possible (expected result was NULL).\n");
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return 1;
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}
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sprintf(pmem_str1, "Hello world from pmem - pmem_str1.\n");
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sprintf(pmem_str2, "Hello world from pmem - pmem_str2.\n");
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sprintf(pmem_str3, "Hello world from persistent memory - pmem_str3.\n");
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fprintf(stdout, "%s", pmem_str1);
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fprintf(stdout, "%s", pmem_str2);
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fprintf(stdout, "%s", pmem_str3);
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memkind_free(pmem_kind, pmem_str1);
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memkind_free(pmem_kind, pmem_str2);
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memkind_free(pmem_kind, pmem_str3);
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err = memkind_destroy_kind(pmem_kind);
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if (err) {
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print_err_message(err);
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return 1;
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}
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fprintf(stdout, "Memory was successfully allocated and released.\n");
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return 0;
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}
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