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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program 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
* General Public License for more details.
*/
/*
* Author: Anatol Pomozov <anatol.pomozov@gmail.com>
*
* Description: This code tests to make sure that when io_destroy
* returns, all outstanding I/Os have been completed. It does this by
* issuing one I/O and then calling io_destroy (without calling
* io_getevents). After the call to io_destroy, the buffer is checked
* to ensure that the data was retrieved. This is done simultaneously
* from 100 threads.
*/
#define _GNU_SOURCE
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include <libaio.h>
#include <stdbool.h>
#define FILENAME "tempfile"
#define FILEPATTERN '1'
#define DESTROY_PATTERN '2'
#define THREADS_NUM 100
static size_t page_size;
void
aio_worker(void *ptr)
{
int i, j, fd, ret;
char *buffer = NULL;
ret = posix_memalign((void **)&buffer, page_size, page_size);
assert(ret == 0);
assert(buffer != NULL);
fd = open(FILENAME, O_DIRECT|O_RDONLY);
if (fd < 0 && errno == EINVAL)
exit(3); /* skip this test, O_DIRECT is unavailable */
assert(fd >= 0);
for (i = 0; i < 1000; i++) {
io_context_t ctx;
struct iocb cb;
struct iocb *cbs[1];
assert(!io_queue_init(1, &ctx));
io_prep_pread(&cb, fd, buffer, page_size, 0);
cbs[0] = &cb;
memset(buffer, '0', page_size);
assert(io_submit(ctx, 1, &cbs[0]) == 1);
// wait random time (0-500ms) ?
io_destroy(ctx);
memset(buffer, DESTROY_PATTERN, page_size);
// wait random for (0-500ms) ?
// check it is still DESTROY_PATTERN
for (j = 0; j < page_size; j++) {
if (buffer[j] != DESTROY_PATTERN) {
fprintf(stderr,
"Buffer has unexpected character: %c\n",
buffer[j]);
exit(EXIT_FAILURE);
}
}
}
free(buffer);
close(fd);
}
int
test_main(void)
{
int i, fd, ret;
char *buffer = NULL;
pthread_t threads[THREADS_NUM];
page_size = sysconf(_SC_PAGESIZE);
assert(page_size >= 1);
ret = posix_memalign((void **)&buffer, page_size, page_size);
assert(ret == 0);
assert(buffer != NULL);
fd = open(FILENAME, O_CREAT|O_TRUNC|O_APPEND|O_RDWR, S_IRUSR|S_IWUSR);
assert(fd != -1);
memset(buffer, FILEPATTERN, page_size);
ret = write(fd, buffer, page_size);
assert(ret == page_size);
close(fd);
for (i = 0; i < THREADS_NUM; i++) {
ret = pthread_create(&threads[i], NULL,
(void *)&aio_worker, NULL);
assert(ret == 0);
}
for (i = 0; i < THREADS_NUM; i++) {
ret = pthread_join(threads[i], NULL);
assert(ret == 0);
}
return EXIT_SUCCESS;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 8
* End:
*/
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