wincall_file.cpp

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/***************************************************************************
 * lib/io/wincall_file.cpp
 *
 * Part of the STXXL. See http://stxxl.sourceforge.net
 *
 * Copyright (C) 2005-2006 Roman Dementiev <[email protected]>
 * Copyright (C) 2008-2010 Andreas Beckmann <[email protected]>
 *
 * 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(const request* req) throw (io_error)
{
 scoped_mutex_lock fd_lock(fd_mutex);
 assert(req->get_file() == this);
 offset_type offset = req->get_offset();
 void* buffer = req->get_buffer();
 size_type bytes = req->get_size();
 request::request_type type = req->get_type();

 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