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 "ntstatus.h"
  30 #define WIN32_NO_STATUS
  31 #include "windef.h"
  32 #include "winternl.h"
  33
  34 #include "handle.h"
  35 #include "thread.h"
  36 #include "request.h"
  37
  38 struct event
  39 {
  40     struct object  obj;             /* object header */
  41     int            manual_reset;    /* is it a manual reset event? */
  42     int            signaled;        /* event has been signaled */
  43 };
  44
  45 static void event_dump( struct object *obj, int verbose );
  46 static int event_signaled( struct object *obj, struct thread *thread );
  47 static int event_satisfied( struct object *obj, struct thread *thread );
  48 static int event_signal( struct object *obj, unsigned int access);
  49
  50 static const struct object_ops event_ops =
  51 {
  52     sizeof(struct event),      /* size */
  53     event_dump,                /* dump */
  54     add_queue,                 /* add_queue */
  55     remove_queue,              /* remove_queue */
  56     event_signaled,            /* signaled */
  57     event_satisfied,           /* satisfied */
  58     event_signal,              /* signal */
  59     no_get_fd,                 /* get_fd */
  60     no_lookup_name,            /* lookup_name */
  61     no_close_handle,           /* close_handle */
  62     no_destroy                 /* destroy */
  63 };
  64
  65
  66 struct event *create_event( const struct unicode_str *name, unsigned int attr,
  67                             int manual_reset, int initial_state )
  68 {
  69     struct event *event;
  70
  71     if ((event = create_named_object( sync_namespace, &event_ops, name, attr )))
  72     {
  73         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
  74         {
  75             /* initialize it if it didn't already exist */
  76             event->manual_reset = manual_reset;
  77             event->signaled     = initial_state;
  78         }
  79     }
  80     return event;
  81 }
  82
  83 struct event *get_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
  84 {
  85     return (struct event *)get_handle_obj( process, handle, access, &event_ops );
  86 }
  87
  88 void pulse_event( struct event *event )
  89 {
  90     event->signaled = 1;
  91     /* wake up all waiters if manual reset, a single one otherwise */
  92     wake_up( &event->obj, !event->manual_reset );
  93     event->signaled = 0;
  94 }
  95
  96 void set_event( struct event *event )
  97 {
  98     event->signaled = 1;
  99     /* wake up all waiters if manual reset, a single one otherwise */
 100     wake_up( &event->obj, !event->manual_reset );
 101 }
 102
 103 void reset_event( struct event *event )
 104 {
 105     event->signaled = 0;
 106 }
 107
 108 static void event_dump( struct object *obj, int verbose )
 109 {
 110     struct event *event = (struct event *)obj;
 111     assert( obj->ops == &event_ops );
 112     fprintf( stderr, "Event manual=%d signaled=%d ",
 113              event->manual_reset, event->signaled );
 114     dump_object_name( &event->obj );
 115     fputc( '\n', stderr );
 116 }
 117
 118 static int event_signaled( struct object *obj, struct thread *thread )
 119 {
 120     struct event *event = (struct event *)obj;
 121     assert( obj->ops == &event_ops );
 122     return event->signaled;
 123 }
 124
 125 static int event_satisfied( struct object *obj, struct thread *thread )
 126 {
 127     struct event *event = (struct event *)obj;
 128     assert( obj->ops == &event_ops );
 129     /* Reset if it's an auto-reset event */
 130     if (!event->manual_reset) event->signaled = 0;
 131     return 0;  /* Not abandoned */
 132 }
 133
 134 static int event_signal( struct object *obj, unsigned int access )
 135 {
 136     struct event *event = (struct event *)obj;
 137     assert( obj->ops == &event_ops );
 138
 139     if (!(access & EVENT_MODIFY_STATE))
 140     {
 141         set_error( STATUS_ACCESS_DENIED );
 142         return 0;
 143     }
 144     set_event( event );
 145     return 1;
 146 }
 147
 148 /* create an event */
 149 DECL_HANDLER(create_event)
 150 {
 151     struct event *event;
 152     struct unicode_str name;
 153
 154     reply->handle = 0;
 155     get_req_unicode_str( &name );
 156     if ((event = create_event( &name, req->attributes, req->manual_reset, req->initial_state )))
 157     {
 158         reply->handle = alloc_handle( current->process, event, req->access,
 159                                       req->attributes & OBJ_INHERIT );
 160         release_object( event );
 161     }
 162 }
 163
 164 /* open a handle to an event */
 165 DECL_HANDLER(open_event)
 166 {
 167     struct unicode_str name;
 168
 169     get_req_unicode_str( &name );
 170     reply->handle = open_object( sync_namespace, &name, &event_ops, req->access, req->attributes );
 171 }
 172
 173 /* do an event operation */
 174 DECL_HANDLER(event_op)
 175 {
 176     struct event *event;
 177
 178     if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
 179     switch(req->op)
 180     {
 181     case PULSE_EVENT:
 182         pulse_event( event );
 183         break;
 184     case SET_EVENT:
 185         set_event( event );
 186         break;
 187     case RESET_EVENT:
 188         reset_event( event );
 189         break;
 190     default:
 191         fatal_protocol_error( current, "event_op: invalid operation %d\n", req->op );
 192     }
 193     release_object( event );
 194 }