2 * Structures and static functions for handling asynchronous I/O.
4 * Copyright (C) 2002 Mike McCormack, Martin Wilck
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * This file declares static functions.
23 * It should only be included by those source files that implement async I/O requests.
26 #ifndef __WINE_ASYNC_H
27 #define __WINE_ASYNC_H
29 #include "wine/server.h"
33 typedef void (*async_handler)(struct async_private *ovp);
34 typedef void (CALLBACK *async_call_completion_func)(ULONG_PTR data);
35 typedef DWORD (*async_get_status)(const struct async_private *ovp);
36 typedef DWORD (*async_get_count)(const struct async_private *ovp);
37 typedef void (*async_set_status)(struct async_private *ovp, const DWORD status);
38 typedef void (*async_cleanup)(struct async_private *ovp);
40 typedef struct async_ops
42 async_get_status get_status;
43 async_set_status set_status;
44 async_get_count get_count;
45 async_call_completion_func call_completion;
46 async_cleanup cleanup;
49 typedef struct async_private
51 struct async_ops *ops;
57 struct async_private *next;
58 struct async_private *prev;
61 /* All functions declared static for Dll separation purposes */
63 inline static void finish_async( async_private *ovp )
66 ovp->prev->next = ovp->next;
68 NtCurrentTeb()->pending_list = ovp->next;
71 ovp->next->prev = ovp->prev;
73 ovp->next = ovp->prev = NULL;
76 if( ovp->event != INVALID_HANDLE_VALUE )
77 NtSetEvent( ovp->event, NULL );
79 if ( ovp->ops->call_completion )
80 QueueUserAPC( ovp->ops->call_completion, GetCurrentThread(), (ULONG_PTR)ovp );
82 ovp->ops->cleanup ( ovp );
85 inline static BOOL __register_async( async_private *ovp, const DWORD status )
89 SERVER_START_REQ( register_async )
91 req->handle = ovp->handle;
92 req->overlapped = ovp;
93 req->type = ovp->type;
94 req->count = ovp->ops->get_count( ovp );
96 ret = wine_server_call( req );
101 SetLastError( RtlNtStatusToDosError(ret) );
102 ovp->ops->set_status ( ovp, ret );
105 if ( ovp->ops->get_status (ovp) != STATUS_PENDING )
111 #define register_old_async(ovp) \
112 __register_async (ovp, ovp->ops->get_status( ovp ));
114 inline static BOOL register_new_async( async_private *ovp )
116 ovp->ops->set_status ( ovp, STATUS_PENDING );
118 ovp->next = NtCurrentTeb()->pending_list;
120 if ( ovp->next ) ovp->next->prev = ovp;
121 NtCurrentTeb()->pending_list = ovp;
123 return __register_async( ovp, STATUS_PENDING );
126 inline static BOOL cancel_async ( async_private *ovp )
128 /* avoid multiple cancellations */
129 if ( ovp->ops->get_status( ovp ) != STATUS_PENDING )
131 ovp->ops->set_status ( ovp, STATUS_CANCELLED );
132 return __register_async ( ovp, STATUS_CANCELLED );
135 #endif /* __WINE_ASYNC_H */