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/* Copyright (C) 2015 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "precompiled.h"
#include "lib/sysdep/os/win/wiocp.h"
#include "lib/file/file.h" // ERR::IO
#include "lib/sysdep/os/win/wutil.h"
void AttachToCompletionPort(HANDLE hFile, HANDLE& hIOCP, ULONG_PTR key, DWORD numConcurrentThreads)
{
WinScopedPreserveLastError s; // CreateIoCompletionPort
// (when called for the first time, ends up creating hIOCP)
hIOCP = CreateIoCompletionPort(hFile, hIOCP, key, numConcurrentThreads);
ENSURE(wutil_IsValidHandle(hIOCP));
}
Status PollCompletionPort(HANDLE hIOCP, DWORD timeout, DWORD& bytesTransferred, ULONG_PTR& key, OVERLAPPED*& ovl)
{
if(hIOCP == 0)
return ERR::INVALID_HANDLE; // NOWARN (happens if called before the first Attach)
WinScopedPreserveLastError s;
bytesTransferred = 0;
key = 0;
ovl = 0;
if(GetQueuedCompletionStatus(hIOCP, &bytesTransferred, &key, &ovl, timeout))
return INFO::OK;
const Status ret = StatusFromWin();
if(ret == ERR::AGAIN || ret == ERR::ABORTED) // avoid polluting last error
SetLastError(0);
return ret; // NOWARN (let caller decide what to do)
}
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