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