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