server/event.c

   1 /*
   2  * Server-side event management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  *
   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.
  10  *
  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.
  15  *
  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
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27
  28 #include "windef.h"
  29
  30 #include "handle.h"
  31 #include "thread.h"
  32 #include "request.h"
  33
  34 struct event
  35 {
  36     struct object  obj;             /* object header */
  37     int            manual_reset;    /* is it a manual reset event? */
  38     int            signaled;        /* event has been signaled */
  39 };
  40
  41 static void event_dump( struct object *obj, int verbose );
  42 static int event_signaled( struct object *obj, struct thread *thread );
  43 static int event_satisfied( struct object *obj, struct thread *thread );
  44 static int event_signal( struct object *obj, unsigned int access);
  45
  46 static const struct object_ops event_ops =
  47 {
  48     sizeof(struct event),      /* size */
  49     event_dump,                /* dump */
  50     add_queue,                 /* add_queue */
  51     remove_queue,              /* remove_queue */
  52     event_signaled,            /* signaled */
  53     event_satisfied,           /* satisfied */
  54     event_signal,              /* signal */
  55     no_get_fd,                 /* get_fd */
  56     no_close_handle,           /* close_handle */
  57     no_destroy                 /* destroy */
  58 };
  59
  60
  61 struct event *create_event( const WCHAR *name, size_t len,
  62                             int manual_reset, int initial_state )
  63 {
  64     struct event *event;
  65
  66     if ((event = create_named_object( sync_namespace, &event_ops, name, len )))
  67     {
  68         if (get_error() != STATUS_OBJECT_NAME_COLLISION)
  69         {
  70             /* initialize it if it didn't already exist */
  71             event->manual_reset = manual_reset;
  72             event->signaled     = initial_state;
  73         }
  74     }
  75     return event;
  76 }
  77
  78 struct event *get_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
  79 {
  80     return (struct event *)get_handle_obj( process, handle, access, &event_ops );
  81 }
  82
  83 void pulse_event( struct event *event )
  84 {
  85     event->signaled = 1;
  86     /* wake up all waiters if manual reset, a single one otherwise */
  87     wake_up( &event->obj, !event->manual_reset );
  88     event->signaled = 0;
  89 }
  90
  91 void set_event( struct event *event )
  92 {
  93     event->signaled = 1;
  94     /* wake up all waiters if manual reset, a single one otherwise */
  95     wake_up( &event->obj, !event->manual_reset );
  96 }
  97
  98 void reset_event( struct event *event )
  99 {
 100     event->signaled = 0;
 101 }
 102
 103 static void event_dump( struct object *obj, int verbose )
 104 {
 105     struct event *event = (struct event *)obj;
 106     assert( obj->ops == &event_ops );
 107     fprintf( stderr, "Event manual=%d signaled=%d ",
 108              event->manual_reset, event->signaled );
 109     dump_object_name( &event->obj );
 110     fputc( '\n', stderr );
 111 }
 112
 113 static int event_signaled( struct object *obj, struct thread *thread )
 114 {
 115     struct event *event = (struct event *)obj;
 116     assert( obj->ops == &event_ops );
 117     return event->signaled;
 118 }
 119
 120 static int event_satisfied( struct object *obj, struct thread *thread )
 121 {
 122     struct event *event = (struct event *)obj;
 123     assert( obj->ops == &event_ops );
 124     /* Reset if it's an auto-reset event */
 125     if (!event->manual_reset) event->signaled = 0;
 126     return 0;  /* Not abandoned */
 127 }
 128
 129 static int event_signal( struct object *obj, unsigned int access )
 130 {
 131     struct event *event = (struct event *)obj;
 132     assert( obj->ops == &event_ops );
 133
 134     if (!(access & EVENT_MODIFY_STATE))
 135     {
 136         set_error( STATUS_ACCESS_DENIED );
 137         return 0;
 138     }
 139     set_event( event );
 140     return 1;
 141 }
 142
 143 /* create an event */
 144 DECL_HANDLER(create_event)
 145 {
 146     struct event *event;
 147
 148     reply->handle = 0;
 149     if ((event = create_event( get_req_data(), get_req_data_size(),
 150                                req->manual_reset, req->initial_state )))
 151     {
 152         reply->handle = alloc_handle( current->process, event, req->access, req->inherit );
 153         release_object( event );
 154     }
 155 }
 156
 157 /* open a handle to an event */
 158 DECL_HANDLER(open_event)
 159 {
 160     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 161                                  &event_ops, req->access, req->inherit );
 162 }
 163
 164 /* do an event operation */
 165 DECL_HANDLER(event_op)
 166 {
 167     struct event *event;
 168
 169     if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
 170     switch(req->op)
 171     {
 172     case PULSE_EVENT:
 173         pulse_event( event );
 174         break;
 175     case SET_EVENT:
 176         set_event( event );
 177         break;
 178     case RESET_EVENT:
 179         reset_event( event );
 180         break;
 181     default:
 182         fatal_protocol_error( current, "event_op: invalid operation %d\n", req->op );
 183     }
 184     release_object( event );
 185 }