1 /* Copyright (C) 2015 Wildfire Games.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining
4 * a copy of this software and associated documentation files (the
5 * "Software"), to deal in the Software without restriction, including
6 * without limitation the rights to use, copy, modify, merge, publish,
7 * distribute, sublicense, and/or sell copies of the Software, and to
8 * permit persons to whom the Software is furnished to do so, subject to
9 * the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included
12 * in all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
15 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
17 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
18 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
19 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
20 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 */
22
23 #include "precompiled.h"
24 #include "lib/sysdep/os/win/wiocp.h"
25
26 #include "lib/file/file.h" // ERR::IO
27 #include "lib/sysdep/os/win/wutil.h"
28
29
AttachToCompletionPort(HANDLE hFile,HANDLE & hIOCP,ULONG_PTR key,DWORD numConcurrentThreads)30 void AttachToCompletionPort(HANDLE hFile, HANDLE& hIOCP, ULONG_PTR key, DWORD numConcurrentThreads)
31 {
32 WinScopedPreserveLastError s; // CreateIoCompletionPort
33
34 // (when called for the first time, ends up creating hIOCP)
35 hIOCP = CreateIoCompletionPort(hFile, hIOCP, key, numConcurrentThreads);
36 ENSURE(wutil_IsValidHandle(hIOCP));
37 }
38
39
PollCompletionPort(HANDLE hIOCP,DWORD timeout,DWORD & bytesTransferred,ULONG_PTR & key,OVERLAPPED * & ovl)40 Status PollCompletionPort(HANDLE hIOCP, DWORD timeout, DWORD& bytesTransferred, ULONG_PTR& key, OVERLAPPED*& ovl)
41 {
42 if(hIOCP == 0)
43 return ERR::INVALID_HANDLE; // NOWARN (happens if called before the first Attach)
44
45 WinScopedPreserveLastError s;
46
47 bytesTransferred = 0;
48 key = 0;
49 ovl = 0;
50 if(GetQueuedCompletionStatus(hIOCP, &bytesTransferred, &key, &ovl, timeout))
51 return INFO::OK;
52 const Status ret = StatusFromWin();
53 if(ret == ERR::AGAIN || ret == ERR::ABORTED) // avoid polluting last error
54 SetLastError(0);
55 return ret; // NOWARN (let caller decide what to do)
56 }
57