| vchtchetkine | 8267511 | 2009-07-24 11:30:41 -0700 | [diff] [blame] | 1 | /*
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| 2 | * Copyright (C) 2009 The Android Open Source Project
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | */
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| 16 |
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| 17 | /** \file
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| 18 | This file consists of implementation of class AdbWinUsbIOCompletion that
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| 19 | encapsulates a wrapper around OVERLAPPED Win32 structure returned from
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| 20 | asynchronous I/O requests issued via WinUsb API.
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| 21 | */
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| 22 |
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| 23 | #include "stdafx.h"
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| 24 | #include "adb_winusb_io_completion.h"
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| 25 |
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| 26 | AdbWinUsbIOCompletion::AdbWinUsbIOCompletion(
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| 27 | AdbWinUsbEndpointObject* parent_io_obj,
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| 28 | ULONG expected_trans_size,
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| 29 | HANDLE event_hndl)
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| 30 | : AdbIOCompletion(parent_io_obj, expected_trans_size, event_hndl) {
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| 31 | }
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| 32 |
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| 33 | AdbWinUsbIOCompletion::~AdbWinUsbIOCompletion() {
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| 34 | }
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| 35 |
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| vchtchetkine | 8267511 | 2009-07-24 11:30:41 -0700 | [diff] [blame] | 36 | bool AdbWinUsbIOCompletion::GetOvelappedIoResult(LPOVERLAPPED ovl_data,
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| 37 | ULONG* bytes_transferred,
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| 38 | bool wait) {
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| 39 | if (NULL != bytes_transferred) {
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| 40 | *bytes_transferred = 0;
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| 41 | }
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| 42 |
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| 43 | if (!IsOpened()) {
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| 44 | SetLastError(ERROR_INVALID_HANDLE);
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| 45 | return false;
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| 46 | }
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| 47 |
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| 48 | ULONG transfer;
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| 49 | bool ret = WinUsb_GetOverlappedResult(
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| 50 | parent_winusb_io_object()->winusb_handle(),
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| 51 | overlapped(),
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| 52 | &transfer,
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| 53 | wait ? TRUE : FALSE) ? true : false;
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| 54 |
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| 55 | // TODO: This is bizzare but I've seen it happening
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| 56 | // that GetOverlappedResult with wait set to true returns "prematurely",
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| 57 | // with wrong transferred bytes value and GetLastError reporting
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| 58 | // ERROR_IO_PENDING. So, lets give it an up to a 20 ms loop!
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| 59 | ULONG error = GetLastError();
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| 60 |
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| 61 | if (wait && ret && (0 == transfer) && (0 != expected_transfer_size_) &&
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| 62 | ((ERROR_IO_INCOMPLETE == error) || (ERROR_IO_PENDING == error))) {
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| 63 | for (int trying = 0; trying < 10; trying++) {
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| 64 | Sleep(2);
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| 65 | ret = WinUsb_GetOverlappedResult(
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| 66 | parent_winusb_io_object()->winusb_handle(),
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| 67 | overlapped(),
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| 68 | &transfer,
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| 69 | wait ? TRUE : FALSE) ? true : false;
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| 70 | error = GetLastError();
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| 71 | if (!ret || (0 != transfer) ||
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| 72 | ((ERROR_IO_INCOMPLETE != error) && (ERROR_IO_PENDING != error))) {
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| 73 | break;
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| 74 | }
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| 75 | }
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| 76 | }
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| 77 |
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| 78 | if (NULL != ovl_data) {
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| 79 | CopyMemory(ovl_data, overlapped(), sizeof(OVERLAPPED));
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| 80 | }
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| 81 |
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| 82 | if (NULL != bytes_transferred) {
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| 83 | *bytes_transferred = transfer;
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| 84 | }
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| 85 |
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| 86 | return ret;
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| 87 | }
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