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/***************************************************************************
* lib/io/wincall_file.cpp
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2005-2006 Roman Dementiev <dementiev@ira.uka.de>
* Copyright (C) 2008-2010 Andreas Beckmann <beckmann@cs.uni-frankfurt.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/bits/io/wincall_file.h>
#if STXXL_HAVE_WINCALL_FILE
#include <stxxl/bits/io/iostats.h>
#include <stxxl/bits/common/error_handling.h>
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <windows.h>
STXXL_BEGIN_NAMESPACE
void wincall_file::serve(void* buffer, offset_type offset, size_type bytes,
request::request_type type)
{
scoped_mutex_lock fd_lock(fd_mutex);
if (bytes > 32 * 1024 * 1024) {
STXXL_ERRMSG("Using a block size larger than 32 MiB may not work with the " << io_type() << " filetype");
}
HANDLE handle = file_des;
LARGE_INTEGER desired_pos;
desired_pos.QuadPart = offset;
if (!SetFilePointerEx(handle, desired_pos, NULL, FILE_BEGIN))
{
STXXL_THROW_WIN_LASTERROR(io_error,
"SetFilePointerEx in wincall_request::serve()" <<
" offset=" << offset <<
" this=" << this <<
" buffer=" << buffer <<
" bytes=" << bytes <<
" type=" << ((type == request::READ) ? "READ" : "WRITE"));
}
else
{
stats::scoped_read_write_timer read_write_timer(bytes, type == request::WRITE);
if (type == request::READ)
{
DWORD NumberOfBytesRead = 0;
assert(bytes <= std::numeric_limits<DWORD>::max());
if (!ReadFile(handle, buffer, (DWORD)bytes, &NumberOfBytesRead, NULL))
{
STXXL_THROW_WIN_LASTERROR(io_error,
"ReadFile" <<
" this=" << this <<
" offset=" << offset <<
" buffer=" << buffer <<
" bytes=" << bytes <<
" type=" << ((type == request::READ) ? "READ" : "WRITE") <<
" NumberOfBytesRead= " << NumberOfBytesRead);
}
else if (NumberOfBytesRead != bytes) {
STXXL_THROW_WIN_LASTERROR(io_error, " partial read: missing " << (bytes - NumberOfBytesRead) << " out of " << bytes << " bytes");
}
}
else
{
DWORD NumberOfBytesWritten = 0;
assert(bytes <= std::numeric_limits<DWORD>::max());
if (!WriteFile(handle, buffer, (DWORD)bytes, &NumberOfBytesWritten, NULL))
{
STXXL_THROW_WIN_LASTERROR(io_error,
"WriteFile" <<
" this=" << this <<
" offset=" << offset <<
" buffer=" << buffer <<
" bytes=" << bytes <<
" type=" << ((type == request::READ) ? "READ" : "WRITE") <<
" NumberOfBytesWritten= " << NumberOfBytesWritten);
}
else if (NumberOfBytesWritten != bytes) {
STXXL_THROW_WIN_LASTERROR(io_error, " partial write: missing " << (bytes - NumberOfBytesWritten) << " out of " << bytes << " bytes");
}
}
}
}
const char* wincall_file::io_type() const
{
return "wincall";
}
STXXL_END_NAMESPACE
#endif // #if STXXL_HAVE_WINCALL_FILE
// vim: et:ts=4:sw=4
|
