99 lines
3.1 KiB
C++
Executable File
99 lines
3.1 KiB
C++
Executable File
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/** \file
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This file consists of implementation of class AdbWinUsbIOCompletion that
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encapsulates a wrapper around OVERLAPPED Win32 structure returned from
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asynchronous I/O requests issued via WinUsb API.
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*/
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#include "stdafx.h"
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#include "adb_winusb_io_completion.h"
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AdbWinUsbIOCompletion::AdbWinUsbIOCompletion(
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AdbWinUsbEndpointObject* parent_io_obj,
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ULONG expected_trans_size,
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HANDLE event_hndl)
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: AdbIOCompletion(parent_io_obj, expected_trans_size, event_hndl) {
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}
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AdbWinUsbIOCompletion::~AdbWinUsbIOCompletion() {
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}
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LONG AdbWinUsbIOCompletion::Release() {
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ATLASSERT(ref_count_ > 0);
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LONG ret = InterlockedDecrement(&ref_count_);
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ATLASSERT(ret >= 0);
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if (0 == ret) {
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LastReferenceReleased();
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delete this;
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}
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return ret;
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}
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bool AdbWinUsbIOCompletion::GetOvelappedIoResult(LPOVERLAPPED ovl_data,
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ULONG* bytes_transferred,
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bool wait) {
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if (NULL != bytes_transferred) {
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*bytes_transferred = 0;
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}
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if (!IsOpened()) {
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SetLastError(ERROR_INVALID_HANDLE);
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return false;
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}
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ULONG transfer;
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bool ret = WinUsb_GetOverlappedResult(
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parent_winusb_io_object()->winusb_handle(),
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overlapped(),
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&transfer,
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wait ? TRUE : FALSE) ? true : false;
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// TODO: This is bizzare but I've seen it happening
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// that GetOverlappedResult with wait set to true returns "prematurely",
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// with wrong transferred bytes value and GetLastError reporting
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// ERROR_IO_PENDING. So, lets give it an up to a 20 ms loop!
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ULONG error = GetLastError();
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if (wait && ret && (0 == transfer) && (0 != expected_transfer_size_) &&
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((ERROR_IO_INCOMPLETE == error) || (ERROR_IO_PENDING == error))) {
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for (int trying = 0; trying < 10; trying++) {
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Sleep(2);
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ret = WinUsb_GetOverlappedResult(
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parent_winusb_io_object()->winusb_handle(),
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overlapped(),
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&transfer,
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wait ? TRUE : FALSE) ? true : false;
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error = GetLastError();
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if (!ret || (0 != transfer) ||
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((ERROR_IO_INCOMPLETE != error) && (ERROR_IO_PENDING != error))) {
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break;
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}
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}
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}
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if (NULL != ovl_data) {
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CopyMemory(ovl_data, overlapped(), sizeof(OVERLAPPED));
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}
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if (NULL != bytes_transferred) {
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*bytes_transferred = transfer;
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}
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return ret;
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}
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