272 lines
8.1 KiB
C
272 lines
8.1 KiB
C
/*
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* Waitable timers management
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*
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* Copyright (C) 1999 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <stdarg.h>
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "winternl.h"
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#include "file.h"
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#include "handle.h"
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#include "request.h"
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struct timer
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{
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struct object obj; /* object header */
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int manual; /* manual reset */
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int signaled; /* current signaled state */
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int period; /* timer period in ms */
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struct timeval when; /* next expiration */
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struct timeout_user *timeout; /* timeout user */
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struct thread *thread; /* thread that set the APC function */
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void *callback; /* callback APC function */
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void *arg; /* callback argument */
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};
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static void timer_dump( struct object *obj, int verbose );
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static int timer_signaled( struct object *obj, struct thread *thread );
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static int timer_satisfied( struct object *obj, struct thread *thread );
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static void timer_destroy( struct object *obj );
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static const struct object_ops timer_ops =
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{
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sizeof(struct timer), /* size */
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timer_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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timer_signaled, /* signaled */
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timer_satisfied, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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no_lookup_name, /* lookup_name */
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no_close_handle, /* close_handle */
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timer_destroy /* destroy */
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};
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/* create a timer object */
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static struct timer *create_timer( const struct unicode_str *name, unsigned int attr,
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int manual )
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{
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struct timer *timer;
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if ((timer = create_named_object( sync_namespace, &timer_ops, name, attr )))
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{
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if (get_error() != STATUS_OBJECT_NAME_EXISTS)
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{
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/* initialize it if it didn't already exist */
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timer->manual = manual;
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timer->signaled = 0;
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timer->when.tv_sec = 0;
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timer->when.tv_usec = 0;
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timer->period = 0;
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timer->timeout = NULL;
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timer->thread = NULL;
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}
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}
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return timer;
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}
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/* callback on timer expiration */
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static void timer_callback( void *private )
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{
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struct timer *timer = (struct timer *)private;
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/* queue an APC */
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if (timer->thread)
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{
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if (!thread_queue_apc( timer->thread, &timer->obj, timer->callback, APC_TIMER, 0,
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(void *)timer->when.tv_sec, (void *)timer->when.tv_usec, timer->arg))
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{
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release_object( timer->thread );
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timer->thread = NULL;
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}
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}
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if (timer->period) /* schedule the next expiration */
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{
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add_timeout( &timer->when, timer->period );
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timer->timeout = add_timeout_user( &timer->when, timer_callback, timer );
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}
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else timer->timeout = NULL;
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/* wake up waiters */
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timer->signaled = 1;
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wake_up( &timer->obj, 0 );
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}
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/* cancel a running timer */
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static int cancel_timer( struct timer *timer )
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{
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int signaled = timer->signaled;
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if (timer->timeout)
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{
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remove_timeout_user( timer->timeout );
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timer->timeout = NULL;
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}
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if (timer->thread)
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{
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thread_cancel_apc( timer->thread, &timer->obj, 0 );
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release_object( timer->thread );
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timer->thread = NULL;
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}
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return signaled;
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}
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/* set the timer expiration and period */
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static int set_timer( struct timer *timer, const abs_time_t *expire, int period,
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void *callback, void *arg )
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{
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int signaled = cancel_timer( timer );
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if (timer->manual)
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{
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period = 0; /* period doesn't make any sense for a manual timer */
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timer->signaled = 0;
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}
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if (!expire->sec && !expire->usec)
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{
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/* special case: use now + period as first expiration */
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gettimeofday( &timer->when, NULL );
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add_timeout( &timer->when, period );
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}
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else
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{
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timer->when.tv_sec = expire->sec;
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timer->when.tv_usec = expire->usec;
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}
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timer->period = period;
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timer->callback = callback;
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timer->arg = arg;
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if (callback) timer->thread = (struct thread *)grab_object( current );
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timer->timeout = add_timeout_user( &timer->when, timer_callback, timer );
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return signaled;
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}
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static void timer_dump( struct object *obj, int verbose )
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{
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struct timer *timer = (struct timer *)obj;
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assert( obj->ops == &timer_ops );
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fprintf( stderr, "Timer manual=%d when=%ld.%06ld period=%d ",
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timer->manual, timer->when.tv_sec, timer->when.tv_usec, timer->period );
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dump_object_name( &timer->obj );
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fputc( '\n', stderr );
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}
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static int timer_signaled( struct object *obj, struct thread *thread )
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{
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struct timer *timer = (struct timer *)obj;
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assert( obj->ops == &timer_ops );
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return timer->signaled;
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}
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static int timer_satisfied( struct object *obj, struct thread *thread )
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{
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struct timer *timer = (struct timer *)obj;
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assert( obj->ops == &timer_ops );
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if (!timer->manual) timer->signaled = 0;
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return 0;
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}
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static void timer_destroy( struct object *obj )
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{
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struct timer *timer = (struct timer *)obj;
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assert( obj->ops == &timer_ops );
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if (timer->timeout) remove_timeout_user( timer->timeout );
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if (timer->thread) release_object( timer->thread );
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}
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/* create a timer */
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DECL_HANDLER(create_timer)
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{
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struct timer *timer;
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struct unicode_str name;
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reply->handle = 0;
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get_req_unicode_str( &name );
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if ((timer = create_timer( &name, req->attributes, req->manual )))
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{
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reply->handle = alloc_handle( current->process, timer, req->access,
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req->attributes & OBJ_INHERIT );
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release_object( timer );
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}
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}
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/* open a handle to a timer */
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DECL_HANDLER(open_timer)
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{
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struct unicode_str name;
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get_req_unicode_str( &name );
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reply->handle = open_object( sync_namespace, &name, &timer_ops, req->access, req->attributes );
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}
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/* set a waitable timer */
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DECL_HANDLER(set_timer)
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{
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struct timer *timer;
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if ((timer = (struct timer *)get_handle_obj( current->process, req->handle,
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TIMER_MODIFY_STATE, &timer_ops )))
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{
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reply->signaled = set_timer( timer, &req->expire, req->period, req->callback, req->arg );
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release_object( timer );
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}
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}
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/* cancel a waitable timer */
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DECL_HANDLER(cancel_timer)
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{
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struct timer *timer;
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if ((timer = (struct timer *)get_handle_obj( current->process, req->handle,
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TIMER_MODIFY_STATE, &timer_ops )))
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{
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reply->signaled = cancel_timer( timer );
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release_object( timer );
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}
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}
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/* Get information on a waitable timer */
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DECL_HANDLER(get_timer_info)
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{
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struct timer *timer;
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if ((timer = (struct timer *)get_handle_obj( current->process, req->handle,
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TIMER_QUERY_STATE, &timer_ops )))
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{
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reply->when.sec = timer->when.tv_sec;
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reply->when.usec = timer->when.tv_usec;
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reply->signaled = timer->signaled;
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release_object( timer );
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}
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}
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