/*
* libhugetlbfs - Easy use of Linux hugepages
* Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/shm.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <hugetlbfs.h>
#include "hugetests.h"
#define P "shm-fork"
#define DESC \
"* Test shared memory behavior when multiple threads are attached *\n"\
"* to a segment. A segment is created and then children are *\n"\
"* spawned which attach, write, read (verify), and detach from the *\n"\
"* shared memory segment. *"
extern int errno;
/* Global Configuration */
static int nr_hugepages;
static int numprocs;
static int shmid = -1;
#define MAX_PROCS 200
#define BUF_SZ 256
#define CHILD_FAIL(thread, fmt, ...) \
do { \
verbose_printf("Thread %d (pid=%d) FAIL: " fmt, \
thread, getpid(), __VA_ARGS__); \
exit(1); \
} while (0)
void cleanup(void)
{
remove_shmid(shmid);
}
static void do_child(int thread, unsigned long size)
{
volatile char *shmaddr;
int j;
unsigned long k;
verbose_printf(".");
for (j=0; j<5; j++) {
shmaddr = shmat(shmid, 0, SHM_RND);
if (shmaddr == MAP_FAILED)
CHILD_FAIL(thread, "shmat() failed: %s",
strerror(errno));
for (k=0;k<size;k++)
shmaddr[k] = (char) (k);
for (k=0;k<size;k++)
if (shmaddr[k] != (char)k)
CHILD_FAIL(thread, "Index %lu mismatch", k);
if (shmdt((const void *)shmaddr) != 0)
CHILD_FAIL(thread, "shmdt() failed: %s",
strerror(errno));
}
exit(0);
}
int main(int argc, char ** argv)
{
unsigned long size;
long hpage_size;
int pid, status;
int i;
int wait_list[MAX_PROCS];
test_init(argc, argv);
if (argc < 3)
CONFIG("Usage: %s <# procs> <# pages>", argv[0]);
numprocs = atoi(argv[1]);
nr_hugepages = atoi(argv[2]);
if (numprocs > MAX_PROCS)
CONFIG("Cannot spawn more than %d processes", MAX_PROCS);
check_hugetlb_shm_group();
hpage_size = check_hugepagesize();
size = hpage_size * nr_hugepages;
verbose_printf("Requesting %lu bytes\n", size);
if ((shmid = shmget(2, size, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W )) < 0)
FAIL("shmget(): %s", strerror(errno));
verbose_printf("shmid: %d\n", shmid);
verbose_printf("Spawning children:\n");
for (i=0; i<numprocs; i++) {
if ((pid = fork()) < 0)
FAIL("fork(): %s", strerror(errno));
if (pid == 0)
do_child(i, size);
wait_list[i] = pid;
}
for (i=0; i<numprocs; i++) {
waitpid(wait_list[i], &status, 0);
if (WEXITSTATUS(status) != 0)
FAIL("Thread %d (pid=%d) failed", i, wait_list[i]);
if (WIFSIGNALED(status))
FAIL("Thread %d (pid=%d) received unhandled signal",
i, wait_list[i]);
}
PASS();
}