glib/gio/gasynchelper.c

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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include "gasynchelper.h"
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/*< private >
* SECTION:gasynchelper
* @short_description: Asynchronous Helper Functions
* @include: gio/gio.h
* @see_also: #GAsyncResult
*
* Provides helper functions for asynchronous operations.
*
**/
#ifdef G_OS_WIN32
gboolean
_g_win32_overlap_wait_result (HANDLE hfile,
OVERLAPPED *overlap,
DWORD *transferred,
GCancellable *cancellable)
{
GPollFD pollfd[2];
gboolean result = FALSE;
gint num, npoll;
pollfd[0].fd = (gint)overlap->hEvent;
pollfd[0].events = G_IO_IN;
num = 1;
if (g_cancellable_make_pollfd (cancellable, &pollfd[1]))
num++;
loop:
npoll = g_poll (pollfd, num, -1);
if (npoll <= 0)
/* error out, should never happen */
goto end;
if (g_cancellable_is_cancelled (cancellable))
{
/* CancelIO only cancels pending operations issued by the
* current thread and since we're doing only sync operations,
* this is safe.... */
/* CancelIoEx is only Vista+. Since we have only one overlap
* operaton on this thread, we can just use: */
result = CancelIo (hfile);
g_warn_if_fail (result);
}
result = GetOverlappedResult (overlap->hEvent, overlap, transferred, FALSE);
if (result == FALSE &&
GetLastError () == ERROR_IO_INCOMPLETE &&
!g_cancellable_is_cancelled (cancellable))
goto loop;
end:
if (num > 1)
g_cancellable_release_fd (cancellable);
return result;
}
#endif