server/timer.c

   1 /*
   2  * Waitable timers management
   3  *
   4  * Copyright (C) 1999 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 <sys/time.h>
  28 #include <sys/types.h>
  29
  30 #include "windef.h"
  31
  32 #include "file.h"
  33 #include "handle.h"
  34 #include "request.h"
  35
  36 struct timer
  37 {
  38     struct object        obj;       /* object header */
  39     int                  manual;    /* manual reset */
  40     int                  signaled;  /* current signaled state */
  41     int                  period;    /* timer period in ms */
  42     struct timeval       when;      /* next expiration */
  43     struct timeout_user *timeout;   /* timeout user */
  44     struct thread       *thread;    /* thread that set the APC function */
  45     void                *callback;  /* callback APC function */
  46     void                *arg;       /* callback argument */
  47 };
  48
  49 static void timer_dump( struct object *obj, int verbose );
  50 static int timer_signaled( struct object *obj, struct thread *thread );
  51 static int timer_satisfied( struct object *obj, struct thread *thread );
  52 static void timer_destroy( struct object *obj );
  53
  54 static const struct object_ops timer_ops =
  55 {
  56     sizeof(struct timer),      /* size */
  57     timer_dump,                /* dump */
  58     add_queue,                 /* add_queue */
  59     remove_queue,              /* remove_queue */
  60     timer_signaled,            /* signaled */
  61     timer_satisfied,           /* satisfied */
  62     no_get_fd,                 /* get_fd */
  63     timer_destroy              /* destroy */
  64 };
  65
  66
  67 /* create a timer object */
  68 static struct timer *create_timer( const WCHAR *name, size_t len, int manual )
  69 {
  70     struct timer *timer;
  71
  72     if ((timer = create_named_object( sync_namespace, &timer_ops, name, len )))
  73     {
  74         if (get_error() != STATUS_OBJECT_NAME_COLLISION)
  75         {
  76             /* initialize it if it didn't already exist */
  77             timer->manual       = manual;
  78             timer->signaled     = 0;
  79             timer->when.tv_sec  = 0;
  80             timer->when.tv_usec = 0;
  81             timer->period       = 0;
  82             timer->timeout      = NULL;
  83             timer->thread       = NULL;
  84         }
  85     }
  86     return timer;
  87 }
  88
  89 /* callback on timer expiration */
  90 static void timer_callback( void *private )
  91 {
  92     struct timer *timer = (struct timer *)private;
  93
  94     /* queue an APC */
  95     if (timer->thread)
  96     {
  97         if (!thread_queue_apc( timer->thread, &timer->obj, timer->callback, APC_TIMER, 0,
  98                                (void *)timer->when.tv_sec, (void *)timer->when.tv_usec, timer->arg))
  99         {
 100             release_object( timer->thread );
 101             timer->thread = NULL;
 102         }
 103     }
 104
 105     if (timer->period)  /* schedule the next expiration */
 106     {
 107         add_timeout( &timer->when, timer->period );
 108         timer->timeout = add_timeout_user( &timer->when, timer_callback, timer );
 109     }
 110     else timer->timeout = NULL;
 111
 112     /* wake up waiters */
 113     timer->signaled = 1;
 114     wake_up( &timer->obj, 0 );
 115 }
 116
 117 /* cancel a running timer */
 118 static int cancel_timer( struct timer *timer )
 119 {
 120     int signaled = timer->signaled;
 121
 122     if (timer->timeout)
 123     {
 124         remove_timeout_user( timer->timeout );
 125         timer->timeout = NULL;
 126     }
 127     if (timer->thread)
 128     {
 129         thread_cancel_apc( timer->thread, &timer->obj, 0 );
 130         release_object( timer->thread );
 131         timer->thread = NULL;
 132     }
 133     return signaled;
 134 }
 135
 136 /* set the timer expiration and period */
 137 static int set_timer( struct timer *timer, const abs_time_t *expire, int period,
 138                       void *callback, void *arg )
 139 {
 140     int signaled = cancel_timer( timer );
 141     if (timer->manual)
 142     {
 143         period = 0;  /* period doesn't make any sense for a manual timer */
 144         timer->signaled = 0;
 145     }
 146     if (!expire->sec && !expire->usec)
 147     {
 148         /* special case: use now + period as first expiration */
 149         gettimeofday( &timer->when, 0 );
 150         add_timeout( &timer->when, period );
 151     }
 152     else
 153     {
 154         timer->when.tv_sec  = expire->sec;
 155         timer->when.tv_usec = expire->usec;
 156     }
 157     timer->period       = period;
 158     timer->callback     = callback;
 159     timer->arg          = arg;
 160     if (callback) timer->thread = (struct thread *)grab_object( current );
 161     timer->timeout = add_timeout_user( &timer->when, timer_callback, timer );
 162     return signaled;
 163 }
 164
 165 static void timer_dump( struct object *obj, int verbose )
 166 {
 167     struct timer *timer = (struct timer *)obj;
 168     assert( obj->ops == &timer_ops );
 169     fprintf( stderr, "Timer manual=%d when=%ld.%06ld period=%d ",
 170              timer->manual, timer->when.tv_sec, timer->when.tv_usec, timer->period );
 171     dump_object_name( &timer->obj );
 172     fputc( '\n', stderr );
 173 }
 174
 175 static int timer_signaled( struct object *obj, struct thread *thread )
 176 {
 177     struct timer *timer = (struct timer *)obj;
 178     assert( obj->ops == &timer_ops );
 179     return timer->signaled;
 180 }
 181
 182 static int timer_satisfied( struct object *obj, struct thread *thread )
 183 {
 184     struct timer *timer = (struct timer *)obj;
 185     assert( obj->ops == &timer_ops );
 186     if (!timer->manual) timer->signaled = 0;
 187     return 0;
 188 }
 189
 190 static void timer_destroy( struct object *obj )
 191 {
 192     struct timer *timer = (struct timer *)obj;
 193     assert( obj->ops == &timer_ops );
 194
 195     if (timer->timeout) remove_timeout_user( timer->timeout );
 196     if (timer->thread) release_object( timer->thread );
 197 }
 198
 199 /* create a timer */
 200 DECL_HANDLER(create_timer)
 201 {
 202     struct timer *timer;
 203
 204     reply->handle = 0;
 205     if ((timer = create_timer( get_req_data(), get_req_data_size(), req->manual )))
 206     {
 207         reply->handle = alloc_handle( current->process, timer, TIMER_ALL_ACCESS, req->inherit );
 208         release_object( timer );
 209     }
 210 }
 211
 212 /* open a handle to a timer */
 213 DECL_HANDLER(open_timer)
 214 {
 215     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 216                                  &timer_ops, req->access, req->inherit );
 217 }
 218
 219 /* set a waitable timer */
 220 DECL_HANDLER(set_timer)
 221 {
 222     struct timer *timer;
 223
 224     if ((timer = (struct timer *)get_handle_obj( current->process, req->handle,
 225                                                  TIMER_MODIFY_STATE, &timer_ops )))
 226     {
 227         reply->signaled = set_timer( timer, &req->expire, req->period, req->callback, req->arg );
 228         release_object( timer );
 229     }
 230 }
 231
 232 /* cancel a waitable timer */
 233 DECL_HANDLER(cancel_timer)
 234 {
 235     struct timer *timer;
 236
 237     if ((timer = (struct timer *)get_handle_obj( current->process, req->handle,
 238                                                  TIMER_MODIFY_STATE, &timer_ops )))
 239     {
 240         reply->signaled = cancel_timer( timer );
 241         release_object( timer );
 242     }
 243 }