| /* |
| * Server-side async I/O support |
| * |
| * Copyright (C) 2007 Alexandre Julliard |
| * |
| * 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 2.1 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 Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA |
| */ |
| |
| #include <assert.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stdarg.h> |
| |
| #include "ntstatus.h" |
| #define WIN32_NO_STATUS |
| #include "windef.h" |
| #include "winternl.h" |
| |
| #include "object.h" |
| #include "file.h" |
| #include "request.h" |
| |
| struct async |
| { |
| struct object obj; /* object header */ |
| struct thread *thread; /* owning thread */ |
| struct list queue_entry; /* entry in async queue list */ |
| struct async_queue *queue; /* queue containing this async */ |
| unsigned int status; /* current status */ |
| struct timeout_user *timeout; |
| unsigned int timeout_status; /* status to report upon timeout */ |
| struct event *event; |
| struct completion *completion; |
| apc_param_t comp_key; |
| async_data_t data; /* data for async I/O call */ |
| }; |
| |
| static void async_dump( struct object *obj, int verbose ); |
| static void async_destroy( struct object *obj ); |
| |
| static const struct object_ops async_ops = |
| { |
| sizeof(struct async), /* size */ |
| async_dump, /* dump */ |
| no_get_type, /* get_type */ |
| no_add_queue, /* add_queue */ |
| NULL, /* remove_queue */ |
| NULL, /* signaled */ |
| NULL, /* satisfied */ |
| no_signal, /* signal */ |
| no_get_fd, /* get_fd */ |
| no_map_access, /* map_access */ |
| default_get_sd, /* get_sd */ |
| default_set_sd, /* set_sd */ |
| no_lookup_name, /* lookup_name */ |
| no_open_file, /* open_file */ |
| no_close_handle, /* close_handle */ |
| async_destroy /* destroy */ |
| }; |
| |
| |
| struct async_queue |
| { |
| struct object obj; /* object header */ |
| struct fd *fd; /* file descriptor owning this queue */ |
| struct list queue; /* queue of async objects */ |
| }; |
| |
| static void async_queue_dump( struct object *obj, int verbose ); |
| |
| static const struct object_ops async_queue_ops = |
| { |
| sizeof(struct async_queue), /* size */ |
| async_queue_dump, /* dump */ |
| no_get_type, /* get_type */ |
| no_add_queue, /* add_queue */ |
| NULL, /* remove_queue */ |
| NULL, /* signaled */ |
| NULL, /* satisfied */ |
| no_signal, /* signal */ |
| no_get_fd, /* get_fd */ |
| no_map_access, /* map_access */ |
| default_get_sd, /* get_sd */ |
| default_set_sd, /* set_sd */ |
| no_lookup_name, /* lookup_name */ |
| no_open_file, /* open_file */ |
| no_close_handle, /* close_handle */ |
| no_destroy /* destroy */ |
| }; |
| |
| |
| static inline void async_reselect( struct async *async ) |
| { |
| if (async->queue->fd) fd_reselect_async( async->queue->fd, async->queue ); |
| } |
| |
| static void async_dump( struct object *obj, int verbose ) |
| { |
| struct async *async = (struct async *)obj; |
| assert( obj->ops == &async_ops ); |
| fprintf( stderr, "Async thread=%p\n", async->thread ); |
| } |
| |
| static void async_destroy( struct object *obj ) |
| { |
| struct async *async = (struct async *)obj; |
| assert( obj->ops == &async_ops ); |
| |
| list_remove( &async->queue_entry ); |
| async_reselect( async ); |
| |
| if (async->timeout) remove_timeout_user( async->timeout ); |
| if (async->event) release_object( async->event ); |
| if (async->completion) release_object( async->completion ); |
| release_object( async->queue ); |
| release_object( async->thread ); |
| } |
| |
| static void async_queue_dump( struct object *obj, int verbose ) |
| { |
| struct async_queue *async_queue = (struct async_queue *)obj; |
| assert( obj->ops == &async_queue_ops ); |
| fprintf( stderr, "Async queue fd=%p\n", async_queue->fd ); |
| } |
| |
| /* notifies client thread of new status of its async request */ |
| void async_terminate( struct async *async, unsigned int status ) |
| { |
| apc_call_t data; |
| |
| assert( status != STATUS_PENDING ); |
| |
| if (async->status != STATUS_PENDING) |
| { |
| /* already terminated, just update status */ |
| async->status = status; |
| return; |
| } |
| |
| memset( &data, 0, sizeof(data) ); |
| data.type = APC_ASYNC_IO; |
| data.async_io.func = async->data.callback; |
| data.async_io.user = async->data.arg; |
| data.async_io.sb = async->data.iosb; |
| data.async_io.status = status; |
| thread_queue_apc( async->thread, &async->obj, &data ); |
| async->status = status; |
| async_reselect( async ); |
| release_object( async ); /* so that it gets destroyed when the async is done */ |
| } |
| |
| /* callback for timeout on an async request */ |
| static void async_timeout( void *private ) |
| { |
| struct async *async = private; |
| |
| async->timeout = NULL; |
| async_terminate( async, async->timeout_status ); |
| } |
| |
| /* create a new async queue for a given fd */ |
| struct async_queue *create_async_queue( struct fd *fd ) |
| { |
| struct async_queue *queue = alloc_object( &async_queue_ops ); |
| |
| if (queue) |
| { |
| queue->fd = fd; |
| list_init( &queue->queue ); |
| } |
| return queue; |
| } |
| |
| /* free an async queue, cancelling all async operations */ |
| void free_async_queue( struct async_queue *queue ) |
| { |
| if (!queue) return; |
| queue->fd = NULL; |
| async_wake_up( queue, STATUS_HANDLES_CLOSED ); |
| release_object( queue ); |
| } |
| |
| /* create an async on a given queue of a fd */ |
| struct async *create_async( struct thread *thread, struct async_queue *queue, const async_data_t *data ) |
| { |
| struct event *event = NULL; |
| struct async *async; |
| |
| if (data->event && !(event = get_event_obj( thread->process, data->event, EVENT_MODIFY_STATE ))) |
| return NULL; |
| |
| if (!(async = alloc_object( &async_ops ))) |
| { |
| if (event) release_object( event ); |
| return NULL; |
| } |
| |
| async->thread = (struct thread *)grab_object( thread ); |
| async->event = event; |
| async->status = STATUS_PENDING; |
| async->data = *data; |
| async->timeout = NULL; |
| async->queue = (struct async_queue *)grab_object( queue ); |
| async->completion = NULL; |
| if (queue->fd) fd_assign_completion( queue->fd, &async->completion, &async->comp_key ); |
| |
| list_add_tail( &queue->queue, &async->queue_entry ); |
| grab_object( async ); |
| |
| if (queue->fd) set_fd_signaled( queue->fd, 0 ); |
| if (event) reset_event( event ); |
| return async; |
| } |
| |
| /* set the timeout of an async operation */ |
| void async_set_timeout( struct async *async, timeout_t timeout, unsigned int status ) |
| { |
| if (async->timeout) remove_timeout_user( async->timeout ); |
| if (timeout != TIMEOUT_INFINITE) async->timeout = add_timeout_user( timeout, async_timeout, async ); |
| else async->timeout = NULL; |
| async->timeout_status = status; |
| } |
| |
| /* store the result of the client-side async callback */ |
| void async_set_result( struct object *obj, unsigned int status, unsigned int total ) |
| { |
| struct async *async = (struct async *)obj; |
| |
| if (obj->ops != &async_ops) return; /* in case the client messed up the APC results */ |
| |
| assert( async->status != STATUS_PENDING ); /* it must have been woken up if we get a result */ |
| |
| if (status == STATUS_PENDING) /* restart it */ |
| { |
| status = async->status; |
| async->status = STATUS_PENDING; |
| grab_object( async ); |
| |
| if (status != STATUS_ALERTED) /* it was terminated in the meantime */ |
| async_terminate( async, status ); |
| else |
| async_reselect( async ); |
| } |
| else |
| { |
| if (async->timeout) remove_timeout_user( async->timeout ); |
| async->timeout = NULL; |
| async->status = status; |
| if (async->completion && async->data.cvalue) |
| add_completion( async->completion, async->comp_key, async->data.cvalue, status, total ); |
| if (async->data.apc) |
| { |
| apc_call_t data; |
| memset( &data, 0, sizeof(data) ); |
| data.type = APC_USER; |
| data.user.func = async->data.apc; |
| data.user.args[0] = (apc_param_t)async->data.arg; |
| data.user.args[1] = (apc_param_t)async->data.iosb; |
| data.user.args[2] = 0; |
| thread_queue_apc( async->thread, NULL, &data ); |
| } |
| if (async->event) set_event( async->event ); |
| else if (async->queue->fd) set_fd_signaled( async->queue->fd, 1 ); |
| } |
| } |
| |
| /* check if an async operation is waiting to be alerted */ |
| int async_waiting( struct async_queue *queue ) |
| { |
| struct list *ptr; |
| struct async *async; |
| |
| if (!queue) return 0; |
| if (!(ptr = list_head( &queue->queue ))) return 0; |
| async = LIST_ENTRY( ptr, struct async, queue_entry ); |
| return async->status == STATUS_PENDING; |
| } |
| |
| /* wake up async operations on the queue */ |
| void async_wake_up( struct async_queue *queue, unsigned int status ) |
| { |
| struct list *ptr, *next; |
| |
| if (!queue) return; |
| |
| LIST_FOR_EACH_SAFE( ptr, next, &queue->queue ) |
| { |
| struct async *async = LIST_ENTRY( ptr, struct async, queue_entry ); |
| async_terminate( async, status ); |
| if (status == STATUS_ALERTED) break; /* only wake up the first one */ |
| } |
| } |