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tim@threads.polyesthetic.msg
210
bdb/examples_cxx/MpoolExample.cpp
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210
bdb/examples_cxx/MpoolExample.cpp
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/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997, 1998, 1999, 2000
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* Sleepycat Software. All rights reserved.
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*
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* $Id: MpoolExample.cpp,v 11.9 2000/10/27 20:32:01 dda Exp $
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*/
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#include "db_config.h"
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <iostream.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#endif
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#include <db_cxx.h>
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#define MPOOL "mpool"
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void init(char *, int, int);
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void run(DB_ENV *, int, int, int);
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static void usage();
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char *progname = "MpoolExample"; // Program name.
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class MpoolExample : public DbEnv
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{
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public:
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MpoolExample();
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void initdb(const char *home, int cachesize);
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void run(int hits, int pagesize, int npages);
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private:
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static const char FileName[];
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// no need for copy and assignment
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MpoolExample(const MpoolExample &);
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void operator = (const MpoolExample &);
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};
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int main(int argc, char *argv[])
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{
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int cachesize = 20 * 1024;
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int hits = 1000;
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int npages = 50;
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int pagesize = 1024;
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for (int i = 1; i < argc; ++i) {
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if (strcmp(argv[i], "-c") == 0) {
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if ((cachesize = atoi(argv[++i])) < 20 * 1024)
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usage();
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}
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else if (strcmp(argv[i], "-h") == 0) {
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if ((hits = atoi(argv[++i])) <= 0)
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usage();
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}
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else if (strcmp(argv[i], "-n") == 0) {
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if ((npages = atoi(argv[++i])) <= 0)
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usage();
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}
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else if (strcmp(argv[i], "-p") == 0) {
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if ((pagesize = atoi(argv[++i])) <= 0)
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usage();
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}
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else {
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usage();
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}
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}
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// Initialize the file.
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init(MPOOL, pagesize, npages);
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try {
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MpoolExample app;
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cout << progname
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<< ": cachesize: " << cachesize
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<< "; pagesize: " << pagesize
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<< "; N pages: " << npages << "\n";
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app.initdb(NULL, cachesize);
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app.run(hits, pagesize, npages);
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cout << "MpoolExample: completed\n";
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return 0;
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}
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catch (DbException &dbe) {
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cerr << "MpoolExample: " << dbe.what() << "\n";
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return 1;
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}
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}
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//
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// init --
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// Create a backing file.
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//
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void
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init(char *file, int pagesize, int npages)
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{
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//
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// Create a file with the right number of pages, and store a page
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// number on each page.
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//
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int fd;
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int flags = O_CREAT | O_RDWR | O_TRUNC;
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#ifdef DB_WIN32
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flags |= O_BINARY;
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#endif
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if ((fd = open(file, flags, 0666)) < 0) {
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cerr << "MpoolExample: " << file << ": " << strerror(errno) << "\n";
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exit(1);
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}
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char *p = new char[pagesize];
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memset(p, 0, pagesize);
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// The pages are numbered from 0.
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for (int cnt = 0; cnt <= npages; ++cnt) {
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*(db_pgno_t *)p = cnt;
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if (write(fd, p, pagesize) != pagesize) {
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cerr << "MpoolExample: " << file
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<< ": " << strerror(errno) << "\n";
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exit(1);
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}
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}
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delete [] p;
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}
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static void
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usage()
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{
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cerr << "usage: MpoolExample [-c cachesize] "
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<< "[-h hits] [-n npages] [-p pagesize]\n";
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exit(1);
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}
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// Note: by using DB_CXX_NO_EXCEPTIONS, we get explicit error returns
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// from various methods rather than exceptions so we can report more
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// information with each error.
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//
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MpoolExample::MpoolExample()
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: DbEnv(DB_CXX_NO_EXCEPTIONS)
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{
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}
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void MpoolExample::initdb(const char *home, int cachesize)
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{
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set_error_stream(&cerr);
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set_errpfx("MpoolExample");
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set_cachesize(0, cachesize, 0);
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open(home, DB_CREATE | DB_INIT_MPOOL, 0);
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}
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//
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// run --
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// Get a set of pages.
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//
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void
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MpoolExample::run(int hits, int pagesize, int npages)
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{
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db_pgno_t pageno;
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int cnt;
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void *p;
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// Open the file in the pool.
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DbMpoolFile *dbmfp;
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DbMpoolFile::open(this, MPOOL, 0, 0, pagesize, NULL, &dbmfp);
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cout << "retrieve " << hits << " random pages... ";
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srand((unsigned int)time(NULL));
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for (cnt = 0; cnt < hits; ++cnt) {
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pageno = (rand() % npages) + 1;
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if ((errno = dbmfp->get(&pageno, 0, &p)) != 0) {
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cerr << "MpoolExample: unable to retrieve page "
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<< (unsigned long)pageno << ": "
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<< strerror(errno) << "\n";
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exit(1);
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}
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if (*(db_pgno_t *)p != pageno) {
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cerr << "MpoolExample: wrong page retrieved ("
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<< (unsigned long)pageno << " != "
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<< *(int *)p << ")\n";
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exit(1);
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}
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if ((errno = dbmfp->put(p, 0)) != 0) {
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cerr << "MpoolExample: unable to return page "
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<< (unsigned long)pageno << ": "
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<< strerror(errno) << "\n";
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exit(1);
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}
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}
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cout << "successful.\n";
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// Close the pool.
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if ((errno = close(0)) != 0) {
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cerr << "MpoolExample: " << strerror(errno) << "\n";
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exit(1);
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}
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}
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