Stxxl  1.2.1
io/test_io.cpp

This is an example of use of <stxxl> files, requests, and completion tracking mechanisms, i.e. stxxl::file , stxxl::request

/***************************************************************************
* io/test_io.cpp
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2002 Roman Dementiev <dementiev@mpi-sb.mpg.de>
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
**************************************************************************/
#include <stxxl/io>
#include <stxxl/aligned_alloc>
using stxxl::file;
struct my_handler
{
void operator () (stxxl::request * ptr)
{
STXXL_MSG("Request completed: " << ptr);
}
};
namespace stxxl
{
std::string hr(uint64, const char *);
}
int main()
{
std::cout << sizeof(void *) << std::endl;
const int size = 1024 * 384;
char * buffer = (char *)stxxl::aligned_alloc<4096>(size);
memset(buffer, 0, size);
#ifdef BOOST_MSVC
const char * paths[2] = { "data1", "data2" };
#else
const char * paths[2] = { "/var/tmp/data1", "/var/tmp/data2" };
stxxl::mmap_file file1(paths[0], file::CREAT | file::RDWR /* | file::DIRECT */, 0);
file1.set_size(size * 1024);
#endif
stxxl::syscall_file file2(paths[1], file::CREAT | file::RDWR /* | file::DIRECT */, 1);
stxxl::request_ptr req[16];
unsigned i = 0;
for ( ; i < 16; i++)
req[i] = file2.awrite(buffer, i * size, size, my_handler());
wait_all(req, 16);
stxxl::aligned_dealloc<4096>(buffer);
std::cout << *(stxxl::stats::get_instance());
stxxl::uint64 sz = 123;
for (i = 0; i < 20; ++i, sz *= 10)
STXXL_MSG(stxxl::hr(sz, "B"));
STXXL_MSG(stxxl::hr((std::numeric_limits<stxxl::uint64>::max)(), "B"));
unlink(paths[0]);
unlink(paths[1]);
return 0;
}