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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright (C) 2018 - 2021 Intel Corporation. */
#include <memkind.h>
#include <limits.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define PMEM_MAX_SIZE (1024 * 1024 * 32)
#define NUM_THREADS 10
static char path[PATH_MAX] = "/tmp/";
void *thread_ind(void *arg);
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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[])
{
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 multithreading with independent pmem kinds."
"\nPMEM kind directory: %s\n",
path);
pthread_t pmem_threads[NUM_THREADS];
int t;
// Create many independent threads
for (t = 0; t < NUM_THREADS; t++) {
if (pthread_create(&pmem_threads[t], NULL, thread_ind, NULL) != 0) {
fprintf(stderr, "Unable to create a thread.\n");
return 1;
}
}
sleep(1);
if (pthread_cond_broadcast(&cond) != 0) {
fprintf(stderr, "Unable to broadcast a condition.\n");
return 1;
}
for (t = 0; t < NUM_THREADS; t++) {
if (pthread_join(pmem_threads[t], NULL) != 0) {
fprintf(stderr, "Thread join failed.\n");
return 1;
}
}
fprintf(stdout,
"Threads successfully allocated memory in the PMEM kinds.\n");
return 0;
}
void *thread_ind(void *arg)
{
struct memkind *pmem_kind;
if (pthread_mutex_lock(&mutex) != 0) {
fprintf(stderr, "Failed to acquire mutex.\n");
return NULL;
}
if (pthread_cond_wait(&cond, &mutex) != 0) {
fprintf(stderr, "Failed to block mutex on condition.\n");
return NULL;
}
if (pthread_mutex_unlock(&mutex) != 0) {
fprintf(stderr, "Failed to release mutex.\n");
return NULL;
}
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);
}
int err = memkind_create_pmem(path, PMEM_MAX_SIZE, &pmem_kind);
if (err) {
print_err_message(err);
return NULL;
}
void *test = memkind_malloc(pmem_kind, 32);
if (test == NULL) {
fprintf(stderr, "Unable to allocate pmem (test) in thread.\n");
return NULL;
}
memkind_free(pmem_kind, test);
err = memkind_destroy_kind(pmem_kind);
if (err) {
print_err_message(err);
}
return NULL;
}
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