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93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
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#ident "$Id$"
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#ident "Copyright (c) 2007-2012 Tokutek Inc. All rights reserved."
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#ident "The technology is licensed by the Massachusetts Institute of Technology, Rutgers State University of New Jersey, and the Research Foundation of State University of New York at Stony Brook under United States of America Serial No. 11/760379 and to the patents and/or patent applications resulting from it."
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#include "dbufio.h"
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#include <stdio.h>
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#include <fcntl.h>
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#include <toku_assert.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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enum { N = 5 };
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enum { M = 10 };
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static void test1 (size_t chars_per_file, size_t bytes_per_read) {
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int fds[N];
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char fnames[N][100];
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size_t n_read[N];
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int still_live[N];
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int n_live=N;
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for (int i=0; i<N; i++) {
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snprintf(fnames[i], 100, "dbufio-test-file%d.data", i);
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unlink(fnames[i]);
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fds[i] = open(fnames[i], O_CREAT|O_RDWR, S_IRWXU);
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//printf("fds[%d]=%d is %s\n", i, fds[i], fnames[i]);
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assert(fds[i]>=0);
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n_read[i]=0;
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still_live[i]=i;
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for (size_t j=0; j<chars_per_file; j++) {
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unsigned char c = (i+j)%256;
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int r = toku_os_write(fds[i], &c, 1);
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if (r!=0) printf("fds[%d]=%d r=%d errno=%d (%s)\n", i, fds[i], r, errno, strerror(errno));
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assert(r==0);
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}
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{
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int r = lseek(fds[i], 0, SEEK_SET);
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assert(r==0);
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}
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}
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DBUFIO_FILESET bfs;
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{
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int r = create_dbufio_fileset(&bfs, N, fds, M);
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assert(r==0);
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}
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while (n_live>0) {
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int indirectnum = random()%n_live;
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int filenum = still_live[indirectnum];
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char buf[bytes_per_read];
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size_t n_read_here=0;
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int r = dbufio_fileset_read(bfs, filenum, buf, bytes_per_read, &n_read_here);
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//printf("read(%d) -> %d (%ld) (old n_read=%ld)\n", filenum, r, n_read_here, n_read[filenum]);
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if (r==0) {
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// did read something
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assert(n_read_here==bytes_per_read);
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n_read[filenum]+=n_read_here;
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//printf(" new n_read=%ld\n", n_read[filenum]);
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assert(n_read[filenum]<=chars_per_file);
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} else {
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assert(r==EOF);
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assert(n_read[filenum]==chars_per_file);
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still_live[indirectnum] = still_live[n_live-1];
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n_live--;
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}
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}
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{
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int r = destroy_dbufio_fileset(bfs);
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assert(r==0);
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}
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for (int i=0; i<N; i++) {
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{
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int r = unlink(fnames[i]);
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assert(r==0);
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}
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{
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int r = close(fds[i]);
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assert(r==0);
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}
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assert(n_read[i]==chars_per_file);
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}
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}
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int main (int argc __attribute__((__unused__)), char *argv[]__attribute__((__unused__))) {
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// test1(0, 1);
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// test1(1, 1);
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// test1(15, 1);
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// test1(100, 1);
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test1(30, 3); // 3 and M are relatively prime. But 3 divides the file size.
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return 0;
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}
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