1 /*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /** \file
18 This file consists of implementation of class AdbWinUsbIOCompletion that
19 encapsulates a wrapper around OVERLAPPED Win32 structure returned from
20 asynchronous I/O requests issued via WinUsb API.
21 */
22
23 #include "stdafx.h"
24 #include "adb_winusb_io_completion.h"
25
AdbWinUsbIOCompletion(AdbWinUsbEndpointObject * parent_io_obj,ULONG expected_trans_size,HANDLE event_hndl)26 AdbWinUsbIOCompletion::AdbWinUsbIOCompletion(
27 AdbWinUsbEndpointObject* parent_io_obj,
28 ULONG expected_trans_size,
29 HANDLE event_hndl)
30 : AdbIOCompletion(parent_io_obj, expected_trans_size, event_hndl) {
31 }
32
~AdbWinUsbIOCompletion()33 AdbWinUsbIOCompletion::~AdbWinUsbIOCompletion() {
34 }
35
Release()36 LONG AdbWinUsbIOCompletion::Release() {
37 ATLASSERT(ref_count_ > 0);
38 LONG ret = InterlockedDecrement(&ref_count_);
39 ATLASSERT(ret >= 0);
40 if (0 == ret) {
41 LastReferenceReleased();
42 delete this;
43 }
44 return ret;
45 }
46
GetOvelappedIoResult(LPOVERLAPPED ovl_data,ULONG * bytes_transferred,bool wait)47 bool AdbWinUsbIOCompletion::GetOvelappedIoResult(LPOVERLAPPED ovl_data,
48 ULONG* bytes_transferred,
49 bool wait) {
50 if (NULL != bytes_transferred) {
51 *bytes_transferred = 0;
52 }
53
54 if (!IsOpened()) {
55 SetLastError(ERROR_INVALID_HANDLE);
56 return false;
57 }
58
59 ULONG transfer;
60 bool ret = WinUsb_GetOverlappedResult(
61 parent_winusb_io_object()->winusb_handle(),
62 overlapped(),
63 &transfer,
64 wait ? TRUE : FALSE) ? true : false;
65
66 // TODO: This is bizzare but I've seen it happening
67 // that GetOverlappedResult with wait set to true returns "prematurely",
68 // with wrong transferred bytes value and GetLastError reporting
69 // ERROR_IO_PENDING. So, lets give it an up to a 20 ms loop!
70 ULONG error = GetLastError();
71
72 if (wait && ret && (0 == transfer) && (0 != expected_transfer_size_) &&
73 ((ERROR_IO_INCOMPLETE == error) || (ERROR_IO_PENDING == error))) {
74 for (int trying = 0; trying < 10; trying++) {
75 Sleep(2);
76 ret = WinUsb_GetOverlappedResult(
77 parent_winusb_io_object()->winusb_handle(),
78 overlapped(),
79 &transfer,
80 wait ? TRUE : FALSE) ? true : false;
81 error = GetLastError();
82 if (!ret || (0 != transfer) ||
83 ((ERROR_IO_INCOMPLETE != error) && (ERROR_IO_PENDING != error))) {
84 break;
85 }
86 }
87 }
88
89 if (NULL != ovl_data) {
90 CopyMemory(ovl_data, overlapped(), sizeof(OVERLAPPED));
91 }
92
93 if (NULL != bytes_transferred) {
94 *bytes_transferred = transfer;
95 }
96
97 return ret;
98 }
99