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295 lines
9.1 KiB
C
295 lines
9.1 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.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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static const WCHAR timer_name[] = {'T','i','m','e','r'};
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struct type_descr timer_type =
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{
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{ timer_name, sizeof(timer_name) }, /* name */
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TIMER_ALL_ACCESS, /* valid_access */
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{ /* mapping */
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STANDARD_RIGHTS_READ | TIMER_QUERY_STATE,
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STANDARD_RIGHTS_WRITE | TIMER_MODIFY_STATE,
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STANDARD_RIGHTS_EXECUTE | SYNCHRONIZE,
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TIMER_ALL_ACCESS
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},
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};
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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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unsigned int period; /* timer period in ms */
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abstime_t 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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client_ptr_t callback; /* callback APC function */
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client_ptr_t 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 wait_queue_entry *entry );
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static void timer_satisfied( struct object *obj, struct wait_queue_entry *entry );
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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_type, /* type */
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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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default_map_access, /* map_access */
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default_get_sd, /* get_sd */
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default_set_sd, /* set_sd */
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default_get_full_name, /* get_full_name */
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no_lookup_name, /* lookup_name */
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directory_link_name, /* link_name */
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default_unlink_name, /* unlink_name */
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no_open_file, /* open_file */
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no_kernel_obj_list, /* get_kernel_obj_list */
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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( struct object *root, const struct unicode_str *name,
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unsigned int attr, int manual, const struct security_descriptor *sd )
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{
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struct timer *timer;
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if ((timer = create_named_object( root, &timer_ops, name, attr, sd )))
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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 = 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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apc_call_t data;
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assert (timer->callback);
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memset( &data, 0, sizeof(data) );
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data.type = APC_USER;
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data.user.func = timer->callback;
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data.user.args[0] = timer->arg;
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data.user.args[1] = (unsigned int)timer->when;
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data.user.args[2] = timer->when >> 32;
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if (!thread_queue_apc( NULL, timer->thread, &timer->obj, &data ))
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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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if (timer->when > 0) timer->when = -monotonic_time;
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timer->when -= (abstime_t)timer->period * 10000;
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timer->timeout = add_timeout_user( abstime_to_timeout(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, APC_USER );
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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, timeout_t expire, unsigned int period,
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client_ptr_t callback, client_ptr_t 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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timer->when = (expire <= 0) ? expire - monotonic_time : max( expire, current_time );
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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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if (expire != TIMEOUT_INFINITE)
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timer->timeout = add_timeout_user( expire, 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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timeout_t timeout = abstime_to_timeout( timer->when );
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assert( obj->ops == &timer_ops );
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fprintf( stderr, "Timer manual=%d when=%s period=%u\n",
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timer->manual, get_timeout_str(timeout), timer->period );
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}
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static int timer_signaled( struct object *obj, struct wait_queue_entry *entry )
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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 void timer_satisfied( struct object *obj, struct wait_queue_entry *entry )
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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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}
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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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struct object *root;
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const struct security_descriptor *sd;
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const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
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if (!objattr) return;
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if ((timer = create_timer( root, &name, objattr->attributes, req->manual, sd )))
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{
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reply->handle = alloc_handle( current->process, timer, req->access, objattr->attributes );
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release_object( timer );
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}
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if (root) release_object( root );
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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 = get_req_unicode_str();
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reply->handle = open_object( current->process, req->rootdir, req->access,
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&timer_ops, &name, 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 = timer->when;
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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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