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 "winnt.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
  45 static const struct object_ops event_ops =
  46 {
  47     sizeof(struct event),      /* size */
  48     event_dump,                /* dump */
  49     add_queue,                 /* add_queue */
  50     remove_queue,              /* remove_queue */
  51     event_signaled,            /* signaled */
  52     event_satisfied,           /* satisfied */
  53     NULL,                      /* get_poll_events */
  54     NULL,                      /* poll_event */
  55     no_get_fd,                 /* get_fd */
  56     no_flush,                  /* flush */
  57     no_get_file_info,          /* get_file_info */
  58     NULL,                      /* queue_async */
  59     no_destroy                 /* destroy */
  60 };
  61
  62
  63 struct event *create_event( const WCHAR *name, size_t len,
  64                             int manual_reset, int initial_state )
  65 {
  66     struct event *event;
  67
  68     if ((event = create_named_object( sync_namespace, &event_ops, name, len )))
  69     {
  70         if (get_error() != STATUS_OBJECT_NAME_COLLISION)
  71         {
  72             /* initialize it if it didn't already exist */
  73             event->manual_reset = manual_reset;
  74             event->signaled     = initial_state;
  75         }
  76     }
  77     return event;
  78 }
  79
  80 struct event *get_event_obj( struct process *process, obj_handle_t handle, unsigned int access )
  81 {
  82     return (struct event *)get_handle_obj( process, handle, access, &event_ops );
  83 }
  84
  85 void pulse_event( struct event *event )
  86 {
  87     event->signaled = 1;
  88     /* wake up all waiters if manual reset, a single one otherwise */
  89     wake_up( &event->obj, !event->manual_reset );
  90     event->signaled = 0;
  91 }
  92
  93 void set_event( struct event *event )
  94 {
  95     event->signaled = 1;
  96     /* wake up all waiters if manual reset, a single one otherwise */
  97     wake_up( &event->obj, !event->manual_reset );
  98 }
  99
 100 void reset_event( struct event *event )
 101 {
 102     event->signaled = 0;
 103 }
 104
 105 static void event_dump( struct object *obj, int verbose )
 106 {
 107     struct event *event = (struct event *)obj;
 108     assert( obj->ops == &event_ops );
 109     fprintf( stderr, "Event manual=%d signaled=%d ",
 110              event->manual_reset, event->signaled );
 111     dump_object_name( &event->obj );
 112     fputc( '\n', stderr );
 113 }
 114
 115 static int event_signaled( struct object *obj, struct thread *thread )
 116 {
 117     struct event *event = (struct event *)obj;
 118     assert( obj->ops == &event_ops );
 119     return event->signaled;
 120 }
 121
 122 static int event_satisfied( struct object *obj, struct thread *thread )
 123 {
 124     struct event *event = (struct event *)obj;
 125     assert( obj->ops == &event_ops );
 126     /* Reset if it's an auto-reset event */
 127     if (!event->manual_reset) event->signaled = 0;
 128     return 0;  /* Not abandoned */
 129 }
 130
 131 /* create an event */
 132 DECL_HANDLER(create_event)
 133 {
 134     struct event *event;
 135
 136     reply->handle = 0;
 137     if ((event = create_event( get_req_data(), get_req_data_size(),
 138                                req->manual_reset, req->initial_state )))
 139     {
 140         reply->handle = alloc_handle( current->process, event, EVENT_ALL_ACCESS, req->inherit );
 141         release_object( event );
 142     }
 143 }
 144
 145 /* open a handle to an event */
 146 DECL_HANDLER(open_event)
 147 {
 148     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 149                                  &event_ops, req->access, req->inherit );
 150 }
 151
 152 /* do an event operation */
 153 DECL_HANDLER(event_op)
 154 {
 155     struct event *event;
 156
 157     if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
 158     switch(req->op)
 159     {
 160     case PULSE_EVENT:
 161         pulse_event( event );
 162         break;
 163     case SET_EVENT:
 164         set_event( event );
 165         break;
 166     case RESET_EVENT:
 167         reset_event( event );
 168         break;
 169     default:
 170         fatal_protocol_error( current, "event_op: invalid operation %d\n", req->op );
 171     }
 172     release_object( event );
 173 }