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138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/*
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* Structures and static functions for handling asynchronous I/O.
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*
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* Copyright (C) 2002 Mike McCormack, Martin Wilck
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* This file declares static functions.
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* It should only be included by those source files that implement async I/O requests.
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*/
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#ifndef __WINE_ASYNC_H
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#define __WINE_ASYNC_H
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#include <thread.h>
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#include <ntstatus.h>
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#include <wine/server.h>
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#include <winternl.h>
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struct async_private;
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typedef void (*async_handler)(struct async_private *ovp);
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typedef void (CALLBACK *async_call_completion_func)(ULONG_PTR data);
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typedef DWORD (*async_get_count)(const struct async_private *ovp);
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typedef void (*async_cleanup)(struct async_private *ovp);
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typedef struct async_ops
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{
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async_get_count get_count;
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async_call_completion_func call_completion;
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async_cleanup cleanup;
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} async_ops;
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typedef struct async_private
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{
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struct async_ops* ops;
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HANDLE handle;
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HANDLE event;
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int fd;
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async_handler func;
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int type;
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IO_STATUS_BLOCK* iosb;
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struct async_private* next;
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struct async_private* prev;
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} async_private;
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/* All functions declared static for Dll separation purposes */
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static void CALLBACK call_user_apc( ULONG_PTR arg1, ULONG_PTR arg2, ULONG_PTR arg3 )
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{
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PAPCFUNC func = (PAPCFUNC)arg1;
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func( arg2 );
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}
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inline static void finish_async( async_private *ovp )
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{
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if (ovp->prev)
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ovp->prev->next = ovp->next;
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else
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NtCurrentTeb()->pending_list = ovp->next;
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if (ovp->next)
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ovp->next->prev = ovp->prev;
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ovp->next = ovp->prev = NULL;
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close(ovp->fd);
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if ( ovp->event != INVALID_HANDLE_VALUE )
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NtSetEvent( ovp->event, NULL );
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if ( ovp->ops->call_completion )
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NtQueueApcThread( GetCurrentThread(), call_user_apc,
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(ULONG_PTR)ovp->ops->call_completion, (ULONG_PTR)ovp, 0 );
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else
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ovp->ops->cleanup( ovp );
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}
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inline static NTSTATUS __register_async( async_private *ovp, const DWORD status )
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{
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NTSTATUS ret;
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SERVER_START_REQ( register_async )
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{
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req->handle = ovp->handle;
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req->overlapped = ovp;
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req->type = ovp->type;
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req->count = ovp->ops->get_count( ovp );
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req->status = status;
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ret = wine_server_call( req );
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}
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SERVER_END_REQ;
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if (ret) ovp->iosb->u.Status = ret;
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if ( ovp->iosb->u.Status != STATUS_PENDING )
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finish_async(ovp);
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return ret;
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}
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#define register_old_async(ovp) \
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__register_async(ovp, ovp->iosb->u.Status);
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inline static NTSTATUS register_new_async( async_private *ovp )
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{
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ovp->iosb->u.Status = STATUS_PENDING;
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ovp->next = NtCurrentTeb()->pending_list;
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ovp->prev = NULL;
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if ( ovp->next ) ovp->next->prev = ovp;
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NtCurrentTeb()->pending_list = ovp;
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return __register_async( ovp, STATUS_PENDING );
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}
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inline static NTSTATUS cancel_async( async_private *ovp )
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{
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/* avoid multiple cancellations */
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if ( ovp->iosb->u.Status != STATUS_PENDING )
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return STATUS_SUCCESS;
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ovp->iosb->u.Status = STATUS_CANCELLED;
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return __register_async( ovp, STATUS_CANCELLED );
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}
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#endif /* __WINE_ASYNC_H */
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