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 #include <stdarg.h>
  28
  29 #include "windef.h"
  30 #include "winternl.h"
  31
  32 #include "handle.h"
  33 #include "thread.h"
  34 #include "request.h"
  35
  36 struct event
  37 {
  38     struct object  obj;             /* object header */
  39     int            manual_reset;    /* is it a manual reset event? */
  40     int            signaled;        /* event has been signaled */
  41 };
  42
  43 static void event_dump( struct object *obj, int verbose );
  44 static int event_signaled( struct object *obj, struct thread *thread );
  45 static int event_satisfied( struct object *obj, struct thread *thread );
  46 static int event_signal( struct object *obj, unsigned int access);
  47
  48 static const struct object_ops event_ops =
  49 {
  50     sizeof(struct event),      /* size */
  51     event_dump,                /* dump */
  52     add_queue,                 /* add_queue */
  53     remove_queue,              /* remove_queue */
  54     event_signaled,            /* signaled */
  55     event_satisfied,           /* satisfied */
  56     event_signal,              /* signal */
  57     no_get_fd,                 /* get_fd */
  58     no_lookup_name,            /* lookup_name */
  59     no_close_handle,           /* close_handle */
  60     no_destroy                 /* destroy */
  61 };
  62
  63
  64 struct event *create_event( const struct unicode_str *name, unsigned int attr,
  65                             int manual_reset, int initial_state )
  66 {
  67     struct event *event;
  68
  69     if ((event = create_named_object( sync_namespace, &event_ops, name, attr )))
  70     {
  71         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
  72         {
  73             /* initialize it if it didn't already exist */
  74             event->manual_reset = manual_reset;
  75             event->signaled     = initial_state;
  76         }
  77     }
  78     return event;
  79 }
  80
  81 struct event *get_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
  82 {
  83     return (struct event *)get_handle_obj( process, handle, access, &event_ops );
  84 }
  85
  86 void pulse_event( struct event *event )
  87 {
  88     event->signaled = 1;
  89     /* wake up all waiters if manual reset, a single one otherwise */
  90     wake_up( &event->obj, !event->manual_reset );
  91     event->signaled = 0;
  92 }
  93
  94 void set_event( struct event *event )
  95 {
  96     event->signaled = 1;
  97     /* wake up all waiters if manual reset, a single one otherwise */
  98     wake_up( &event->obj, !event->manual_reset );
  99 }
 100
 101 void reset_event( struct event *event )
 102 {
 103     event->signaled = 0;
 104 }
 105
 106 static void event_dump( struct object *obj, int verbose )
 107 {
 108     struct event *event = (struct event *)obj;
 109     assert( obj->ops == &event_ops );
 110     fprintf( stderr, "Event manual=%d signaled=%d ",
 111              event->manual_reset, event->signaled );
 112     dump_object_name( &event->obj );
 113     fputc( '\n', stderr );
 114 }
 115
 116 static int event_signaled( struct object *obj, struct thread *thread )
 117 {
 118     struct event *event = (struct event *)obj;
 119     assert( obj->ops == &event_ops );
 120     return event->signaled;
 121 }
 122
 123 static int event_satisfied( struct object *obj, struct thread *thread )
 124 {
 125     struct event *event = (struct event *)obj;
 126     assert( obj->ops == &event_ops );
 127     /* Reset if it's an auto-reset event */
 128     if (!event->manual_reset) event->signaled = 0;
 129     return 0;  /* Not abandoned */
 130 }
 131
 132 static int event_signal( struct object *obj, unsigned int access )
 133 {
 134     struct event *event = (struct event *)obj;
 135     assert( obj->ops == &event_ops );
 136
 137     if (!(access & EVENT_MODIFY_STATE))
 138     {
 139         set_error( STATUS_ACCESS_DENIED );
 140         return 0;
 141     }
 142     set_event( event );
 143     return 1;
 144 }
 145
 146 /* create an event */
 147 DECL_HANDLER(create_event)
 148 {
 149     struct event *event;
 150     struct unicode_str name;
 151
 152     reply->handle = 0;
 153     get_req_unicode_str( &name );
 154     if ((event = create_event( &name, req->attributes, req->manual_reset, req->initial_state )))
 155     {
 156         reply->handle = alloc_handle( current->process, event, req->access,
 157                                       req->attributes & OBJ_INHERIT );
 158         release_object( event );
 159     }
 160 }
 161
 162 /* open a handle to an event */
 163 DECL_HANDLER(open_event)
 164 {
 165     struct unicode_str name;
 166
 167     get_req_unicode_str( &name );
 168     reply->handle = open_object( sync_namespace, &name, &event_ops, req->access, req->attributes );
 169 }
 170
 171 /* do an event operation */
 172 DECL_HANDLER(event_op)
 173 {
 174     struct event *event;
 175
 176     if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
 177     switch(req->op)
 178     {
 179     case PULSE_EVENT:
 180         pulse_event( event );
 181         break;
 182     case SET_EVENT:
 183         set_event( event );
 184         break;
 185     case RESET_EVENT:
 186         reset_event( event );
 187         break;
 188     default:
 189         fatal_protocol_error( current, "event_op: invalid operation %d\n", req->op );
 190     }
 191     release_object( event );
 192 }