/* * 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; unsigned long 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 long 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] = (unsigned long)async->data.arg; data.user.args[1] = (unsigned long)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 */ } }