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Sweden-Number/server/queue.c

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/*
* Server-side message queues
*
* Copyright (C) 2000 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "handle.h"
#include "thread.h"
#include "process.h"
#include "request.h"
#include "user.h"
enum message_kind { SEND_MESSAGE, POST_MESSAGE, COOKED_HW_MESSAGE, RAW_HW_MESSAGE };
#define NB_MSG_KINDS (RAW_HW_MESSAGE+1)
struct message_result
{
struct message_result *send_next; /* next in sender list */
struct message_result *recv_next; /* next in receiver list */
struct msg_queue *sender; /* sender queue */
struct msg_queue *receiver; /* receiver queue */
int replied; /* has it been replied to? */
unsigned int result; /* reply result */
unsigned int error; /* error code to pass back to sender */
void *data; /* message reply data */
unsigned int data_size; /* size of message reply data */
struct timeout_user *timeout; /* result timeout */
};
struct message
{
struct message *next; /* next message in list */
struct message *prev; /* prev message in list */
enum message_type type; /* message type */
user_handle_t win; /* window handle */
unsigned int msg; /* message code */
unsigned int wparam; /* parameters */
unsigned int lparam; /* parameters */
int x; /* x position */
int y; /* y position */
unsigned int time; /* message time */
unsigned int info; /* extra info */
void *data; /* message data for sent messages */
unsigned int data_size; /* size of message data */
struct message_result *result; /* result in sender queue */
};
struct message_list
{
struct message *first; /* head of list */
struct message *last; /* tail of list */
};
struct timer
{
struct timer *next; /* next timer in list */
struct timer *prev; /* prev timer in list */
struct timeval when; /* next expiration */
unsigned int rate; /* timer rate in ms */
user_handle_t win; /* window handle */
unsigned int msg; /* message to post */
unsigned int id; /* timer id */
unsigned int lparam; /* lparam for message */
};
struct msg_queue
{
struct object obj; /* object header */
unsigned int wake_bits; /* wakeup bits */
unsigned int wake_mask; /* wakeup mask */
unsigned int changed_bits; /* changed wakeup bits */
unsigned int changed_mask; /* changed wakeup mask */
int paint_count; /* pending paint messages count */
struct message_list msg_list[NB_MSG_KINDS]; /* lists of messages */
struct message_result *send_result; /* stack of sent messages waiting for result */
struct message_result *recv_result; /* stack of received messages waiting for result */
struct message *last_msg; /* last msg returned to the app and not removed */
enum message_kind last_msg_kind; /* message kind of last_msg */
struct timer *first_timer; /* head of timer list */
struct timer *last_timer; /* tail of timer list */
struct timer *next_timer; /* next timer to expire */
struct timeout_user *timeout; /* timeout for next timer to expire */
};
static void msg_queue_dump( struct object *obj, int verbose );
static int msg_queue_add_queue( struct object *obj, struct wait_queue_entry *entry );
static void msg_queue_remove_queue( struct object *obj, struct wait_queue_entry *entry );
static int msg_queue_signaled( struct object *obj, struct thread *thread );
static int msg_queue_satisfied( struct object *obj, struct thread *thread );
static void msg_queue_destroy( struct object *obj );
static void timer_callback( void *private );
static const struct object_ops msg_queue_ops =
{
sizeof(struct msg_queue), /* size */
msg_queue_dump, /* dump */
msg_queue_add_queue, /* add_queue */
msg_queue_remove_queue, /* remove_queue */
msg_queue_signaled, /* signaled */
msg_queue_satisfied, /* satisfied */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_get_fd, /* get_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
NULL, /* queue_async */
msg_queue_destroy /* destroy */
};
static struct msg_queue *create_msg_queue( struct thread *thread )
{
struct msg_queue *queue;
int i;
if ((queue = alloc_object( &msg_queue_ops, -1 )))
{
queue->wake_bits = 0;
queue->wake_mask = 0;
queue->changed_bits = 0;
queue->changed_mask = 0;
queue->paint_count = 0;
queue->send_result = NULL;
queue->recv_result = NULL;
queue->last_msg = NULL;
queue->first_timer = NULL;
queue->last_timer = NULL;
queue->next_timer = NULL;
queue->timeout = NULL;
for (i = 0; i < NB_MSG_KINDS; i++)
queue->msg_list[i].first = queue->msg_list[i].last = NULL;
thread->queue = queue;
if (!thread->process->queue)
thread->process->queue = (struct msg_queue *)grab_object( queue );
}
return queue;
}
/* check the queue status */
inline static int is_signaled( struct msg_queue *queue )
{
return ((queue->wake_bits & queue->wake_mask) || (queue->changed_bits & queue->changed_mask));
}
/* set some queue bits */
inline static void set_queue_bits( struct msg_queue *queue, unsigned int bits )
{
queue->wake_bits |= bits;
queue->changed_bits |= bits;
if (is_signaled( queue )) wake_up( &queue->obj, 0 );
}
/* clear some queue bits */
inline static void clear_queue_bits( struct msg_queue *queue, unsigned int bits )
{
queue->wake_bits &= ~bits;
queue->changed_bits &= ~bits;
}
/* get the QS_* bit corresponding to a given hardware message */
inline static int get_hardware_msg_bit( struct message *msg )
{
if (msg->msg == WM_MOUSEMOVE || msg->msg == WM_NCMOUSEMOVE) return QS_MOUSEMOVE;
if (msg->msg >= WM_KEYFIRST && msg->msg <= WM_KEYLAST) return QS_KEY;
return QS_MOUSEBUTTON;
}
/* get the current thread queue, creating it if needed */
inline static struct msg_queue *get_current_queue(void)
{
struct msg_queue *queue = current->queue;
if (!queue) queue = create_msg_queue( current );
return queue;
}
/* append a message to the end of a list */
inline static void append_message( struct message_list *list, struct message *msg )
{
msg->next = NULL;
if ((msg->prev = list->last)) msg->prev->next = msg;
else list->first = msg;
list->last = msg;
}
/* unlink a message from a list it */
inline static void unlink_message( struct message_list *list, struct message *msg )
{
if (msg->next) msg->next->prev = msg->prev;
else list->last = msg->prev;
if (msg->prev) msg->prev->next = msg->next;
else list->first = msg->next;
}
/* try to merge a message with the last in the list; return 1 if successful */
static int merge_message( struct message_list *list, const struct message *msg )
{
struct message *prev = list->last;
if (!prev) return 0;
if (prev->result) return 0;
if (prev->win != msg->win) return 0;
if (prev->msg != msg->msg) return 0;
if (prev->type != msg->type) return 0;
/* now we can merge it */
prev->wparam = msg->wparam;
prev->lparam = msg->lparam;
prev->x = msg->x;
prev->y = msg->y;
prev->time = msg->time;
prev->info = msg->info;
return 1;
}
/* free a result structure */
static void free_result( struct message_result *result )
{
if (result->timeout) remove_timeout_user( result->timeout );
if (result->data) free( result->data );
free( result );
}
/* store the message result in the appropriate structure */
static void store_message_result( struct message_result *res, unsigned int result,
unsigned int error )
{
res->result = result;
res->error = error;
res->replied = 1;
if (res->timeout)
{
remove_timeout_user( res->timeout );
res->timeout = NULL;
}
/* wake sender queue if waiting on this result */
if (res->sender && res->sender->send_result == res)
set_queue_bits( res->sender, QS_SMRESULT );
}
/* free a message when deleting a queue or window */
static void free_message( struct message *msg )
{
struct message_result *result = msg->result;
if (result)
{
if (result->sender)
{
result->receiver = NULL;
store_message_result( result, 0, STATUS_ACCESS_DENIED /*FIXME*/ );
}
else free_result( result );
}
if (msg->data) free( msg->data );
free( msg );
}
/* remove (and free) a message from a message list */
static void remove_queue_message( struct msg_queue *queue, struct message *msg,
enum message_kind kind )
{
int clr_bit;
struct message *other;
if (queue->last_msg == msg) queue->last_msg = NULL;
unlink_message( &queue->msg_list[kind], msg );
switch(kind)
{
case SEND_MESSAGE:
if (!queue->msg_list[kind].first) clear_queue_bits( queue, QS_SENDMESSAGE );
break;
case POST_MESSAGE:
if (!queue->msg_list[kind].first) clear_queue_bits( queue, QS_POSTMESSAGE );
break;
case COOKED_HW_MESSAGE:
case RAW_HW_MESSAGE:
clr_bit = get_hardware_msg_bit( msg );
for (other = queue->msg_list[kind].first; other; other = other->next)
if (get_hardware_msg_bit( other ) == clr_bit) break;
if (!other) clear_queue_bits( queue, clr_bit );
break;
}
free_message( msg );
}
/* message timed out without getting a reply */
static void result_timeout( void *private )
{
struct message_result *result = private;
assert( !result->replied );
result->timeout = NULL;
store_message_result( result, 0, STATUS_TIMEOUT );
}
/* allocate and fill a message result structure */
static struct message_result *alloc_message_result( struct msg_queue *send_queue,
struct msg_queue *recv_queue,
unsigned int timeout )
{
struct message_result *result = mem_alloc( sizeof(*result) );
if (result)
{
/* put the result on the sender result stack */
result->sender = send_queue;
result->receiver = recv_queue;
result->replied = 0;
result->data = NULL;
result->data_size = 0;
result->timeout = NULL;
result->send_next = send_queue->send_result;
send_queue->send_result = result;
if (timeout != -1)
{
struct timeval when;
gettimeofday( &when, 0 );
add_timeout( &when, timeout );
result->timeout = add_timeout_user( &when, result_timeout, result );
}
}
return result;
}
/* receive a message, removing it from the sent queue */
static void receive_message( struct msg_queue *queue, struct message *msg,
struct get_message_reply *reply )
{
struct message_result *result = msg->result;
reply->total = msg->data_size;
if (msg->data_size > get_reply_max_size())
{
set_error( STATUS_BUFFER_OVERFLOW );
return;
}
reply->type = msg->type;
reply->win = msg->win;
reply->msg = msg->msg;
reply->wparam = msg->wparam;
reply->lparam = msg->lparam;
reply->x = msg->x;
reply->y = msg->y;
reply->time = msg->time;
reply->info = msg->info;
if (msg->data) set_reply_data_ptr( msg->data, msg->data_size );
unlink_message( &queue->msg_list[SEND_MESSAGE], msg );
/* put the result on the receiver result stack */
if (result)
{
result->recv_next = queue->recv_result;
queue->recv_result = result;
}
free( msg );
if (!queue->msg_list[SEND_MESSAGE].first) clear_queue_bits( queue, QS_SENDMESSAGE );
}
/* set the result of the current received message */
static void reply_message( struct msg_queue *queue, unsigned int result,
unsigned int error, int remove, const void *data, size_t len )
{
struct message_result *res = queue->recv_result;
if (remove)
{
queue->recv_result = res->recv_next;
res->receiver = NULL;
if (!res->sender) /* no one waiting for it */
{
free_result( res );
return;
}
}
if (!res->replied)
{
if (len && (res->data = memdup( data, len ))) res->data_size = len;
store_message_result( res, result, error );
}
}
/* empty a message list and free all the messages */
static void empty_msg_list( struct message_list *list )
{
struct message *msg = list->first;
while (msg)
{
struct message *next = msg->next;
free_message( msg );
msg = next;
}
}
/* cleanup all pending results when deleting a queue */
static void cleanup_results( struct msg_queue *queue )
{
struct message_result *result, *next;
result = queue->send_result;
while (result)
{
next = result->send_next;
result->sender = NULL;
if (!result->receiver) free_result( result );
result = next;
}
while (queue->recv_result)
reply_message( queue, 0, STATUS_ACCESS_DENIED /*FIXME*/, 1, NULL, 0 );
}
static int msg_queue_add_queue( struct object *obj, struct wait_queue_entry *entry )
{
struct msg_queue *queue = (struct msg_queue *)obj;
struct process *process = entry->thread->process;
/* a thread can only wait on its own queue */
if (entry->thread->queue != queue)
{
set_error( STATUS_ACCESS_DENIED );
return 0;
}
/* if waiting on the main process queue, set the idle event */
if (process->queue == queue)
{
if (process->idle_event) set_event( process->idle_event );
}
add_queue( obj, entry );
return 1;
}
static void msg_queue_remove_queue(struct object *obj, struct wait_queue_entry *entry )
{
struct msg_queue *queue = (struct msg_queue *)obj;
struct process *process = entry->thread->process;
remove_queue( obj, entry );
assert( entry->thread->queue == queue );
/* if waiting on the main process queue, reset the idle event */
if (process->queue == queue)
{
if (process->idle_event) reset_event( process->idle_event );
}
}
static void msg_queue_dump( struct object *obj, int verbose )
{
struct msg_queue *queue = (struct msg_queue *)obj;
fprintf( stderr, "Msg queue bits=%x mask=%x\n",
queue->wake_bits, queue->wake_mask );
}
static int msg_queue_signaled( struct object *obj, struct thread *thread )
{
struct msg_queue *queue = (struct msg_queue *)obj;
return is_signaled( queue );
}
static int msg_queue_satisfied( struct object *obj, struct thread *thread )
{
struct msg_queue *queue = (struct msg_queue *)obj;
queue->wake_mask = 0;
queue->changed_mask = 0;
return 0; /* Not abandoned */
}
static void msg_queue_destroy( struct object *obj )
{
struct msg_queue *queue = (struct msg_queue *)obj;
struct timer *timer = queue->first_timer;
int i;
cleanup_results( queue );
for (i = 0; i < NB_MSG_KINDS; i++) empty_msg_list( &queue->msg_list[i] );
while (timer)
{
struct timer *next = timer->next;
free( timer );
timer = next;
}
if (queue->timeout) remove_timeout_user( queue->timeout );
}
/* set the next timer to expire */
static void set_next_timer( struct msg_queue *queue, struct timer *timer )
{
if (queue->timeout)
{
remove_timeout_user( queue->timeout );
queue->timeout = NULL;
}
if ((queue->next_timer = timer))
queue->timeout = add_timeout_user( &timer->when, timer_callback, queue );
/* set/clear QS_TIMER bit */
if (queue->next_timer == queue->first_timer)
clear_queue_bits( queue, QS_TIMER );
else
set_queue_bits( queue, QS_TIMER );
}
/* callback for the next timer expiration */
static void timer_callback( void *private )
{
struct msg_queue *queue = private;
queue->timeout = NULL;
/* move on to the next timer */
set_next_timer( queue, queue->next_timer->next );
}
/* link a timer at its rightful place in the queue list */
static void link_timer( struct msg_queue *queue, struct timer *timer )
{
struct timer *pos = queue->next_timer;
while (pos && time_before( &pos->when, &timer->when )) pos = pos->next;
if (pos) /* insert before pos */
{
if ((timer->prev = pos->prev)) timer->prev->next = timer;
else queue->first_timer = timer;
timer->next = pos;
pos->prev = timer;
}
else /* insert at end */
{
timer->next = NULL;
timer->prev = queue->last_timer;
if (queue->last_timer) queue->last_timer->next = timer;
else queue->first_timer = timer;
queue->last_timer = timer;
}
/* check if we replaced the next timer */
if (pos == queue->next_timer) set_next_timer( queue, timer );
}
/* remove a timer from the queue timer list */
static void unlink_timer( struct msg_queue *queue, struct timer *timer )
{
if (timer->next) timer->next->prev = timer->prev;
else queue->last_timer = timer->prev;
if (timer->prev) timer->prev->next = timer->next;
else queue->first_timer = timer->next;
/* check if we removed the next timer */
if (queue->next_timer == timer) set_next_timer( queue, timer->next );
else if (queue->next_timer == queue->first_timer) clear_queue_bits( queue, QS_TIMER );
}
/* restart an expired timer */
static void restart_timer( struct msg_queue *queue, struct timer *timer )
{
struct timeval now;
unlink_timer( queue, timer );
gettimeofday( &now, 0 );
while (!time_before( &now, &timer->when )) add_timeout( &timer->when, timer->rate );
link_timer( queue, timer );
}
/* find an expired timer matching the filtering parameters */
static struct timer *find_expired_timer( struct msg_queue *queue, user_handle_t win,
unsigned int get_first, unsigned int get_last,
int remove )
{
struct timer *timer;
for (timer = queue->first_timer; (timer && timer != queue->next_timer); timer = timer->next)
{
if (win && timer->win != win) continue;
if (timer->msg >= get_first && timer->msg <= get_last)
{
if (remove) restart_timer( queue, timer );
return timer;
}
}
return NULL;
}
/* kill a timer */
static int kill_timer( struct msg_queue *queue, user_handle_t win,
unsigned int msg, unsigned int id )
{
struct timer *timer;
for (timer = queue->first_timer; timer; timer = timer->next)
{
if (timer->win != win || timer->msg != msg || timer->id != id) continue;
unlink_timer( queue, timer );
free( timer );
return 1;
}
return 0;
}
/* add a timer */
static struct timer *set_timer( struct msg_queue *queue, unsigned int rate )
{
struct timer *timer = mem_alloc( sizeof(*timer) );
if (timer)
{
timer->rate = rate;
gettimeofday( &timer->when, 0 );
add_timeout( &timer->when, rate );
link_timer( queue, timer );
}
return timer;
}
/* increment (or decrement if 'incr' is negative) the queue paint count */
void inc_queue_paint_count( struct thread *thread, int incr )
{
struct msg_queue *queue = thread->queue;
assert( queue );
if ((queue->paint_count += incr) < 0) queue->paint_count = 0;
if (queue->paint_count)
set_queue_bits( queue, QS_PAINT );
else
clear_queue_bits( queue, QS_PAINT );
}
/* remove all messages and timers belonging to a certain window */
void queue_cleanup_window( struct thread *thread, user_handle_t win )
{
struct msg_queue *queue = thread->queue;
struct timer *timer;
struct message *msg;
int i;
if (!queue) return;
/* remove timers */
timer = queue->first_timer;
while (timer)
{
struct timer *next = timer->next;
if (timer->win == win)
{
unlink_timer( queue, timer );
free( timer );
}
timer = next;
}
/* remove messages */
for (i = 0; i < NB_MSG_KINDS; i++)
{
msg = queue->msg_list[i].first;
while (msg)
{
struct message *next = msg->next;
if (msg->win == win) remove_queue_message( queue, msg, i );
msg = next;
}
}
}
/* get the message queue of the current thread */
DECL_HANDLER(get_msg_queue)
{
struct msg_queue *queue = get_current_queue();
reply->handle = 0;
if (queue) reply->handle = alloc_handle( current->process, queue, SYNCHRONIZE, 0 );
}
/* set the current message queue wakeup mask */
DECL_HANDLER(set_queue_mask)
{
struct msg_queue *queue = get_current_queue();
if (queue)
{
queue->wake_mask = req->wake_mask;
queue->changed_mask = req->changed_mask;
reply->wake_bits = queue->wake_bits;
reply->changed_bits = queue->changed_bits;
if (is_signaled( queue ))
{
/* if skip wait is set, do what would have been done in the subsequent wait */
if (req->skip_wait) msg_queue_satisfied( &queue->obj, current );
else wake_up( &queue->obj, 0 );
}
}
}
/* get the current message queue status */
DECL_HANDLER(get_queue_status)
{
struct msg_queue *queue = current->queue;
if (queue)
{
reply->wake_bits = queue->wake_bits;
reply->changed_bits = queue->changed_bits;
if (req->clear) queue->changed_bits = 0;
}
else reply->wake_bits = reply->changed_bits = 0;
}
/* send a message to a thread queue */
DECL_HANDLER(send_message)
{
struct message *msg;
struct msg_queue *send_queue = get_current_queue();
struct msg_queue *recv_queue;
struct thread *thread = get_thread_from_id( req->id );
if (!thread) return;
if (!(recv_queue = thread->queue))
{
set_error( STATUS_INVALID_PARAMETER );
release_object( thread );
return;
}
if ((msg = mem_alloc( sizeof(*msg) )))
{
msg->type = req->type;
msg->win = get_user_full_handle( req->win );
msg->msg = req->msg;
msg->wparam = req->wparam;
msg->lparam = req->lparam;
msg->time = req->time;
msg->x = req->x;
msg->y = req->y;
msg->info = req->info;
msg->result = NULL;
msg->data = NULL;
msg->data_size = 0;
switch(msg->type)
{
case MSG_OTHER_PROCESS:
msg->data_size = get_req_data_size();
if (msg->data_size && !(msg->data = memdup( get_req_data(), msg->data_size )))
{
free( msg );
break;
}
/* fall through */
case MSG_ASCII:
case MSG_UNICODE:
case MSG_CALLBACK:
if (!(msg->result = alloc_message_result( send_queue, recv_queue, req->timeout )))
{
free( msg );
break;
}
/* fall through */
case MSG_NOTIFY:
append_message( &recv_queue->msg_list[SEND_MESSAGE], msg );
set_queue_bits( recv_queue, QS_SENDMESSAGE );
break;
case MSG_POSTED:
/* needed for posted DDE messages */
msg->data_size = get_req_data_size();
if (msg->data_size && !(msg->data = memdup( get_req_data(), msg->data_size )))
{
free( msg );
break;
}
append_message( &recv_queue->msg_list[POST_MESSAGE], msg );
set_queue_bits( recv_queue, QS_POSTMESSAGE );
break;
case MSG_HARDWARE_RAW:
case MSG_HARDWARE_COOKED:
{
struct message_list *list = ((msg->type == MSG_HARDWARE_RAW) ?
&recv_queue->msg_list[RAW_HW_MESSAGE] :
&recv_queue->msg_list[COOKED_HW_MESSAGE]);
if (msg->msg == WM_MOUSEMOVE && merge_message( list, msg ))
{
free( msg );
break;
}
append_message( list, msg );
set_queue_bits( recv_queue, get_hardware_msg_bit(msg) );
break;
}
default:
set_error( STATUS_INVALID_PARAMETER );
free( msg );
break;
}
}
release_object( thread );
}
/* return a message to the application, removing it from the queue if needed */
static void return_message_to_app( struct msg_queue *queue, int flags,
struct get_message_reply *reply,
struct message *msg, enum message_kind kind )
{
reply->total = msg->data_size;
if (msg->data_size > get_reply_max_size())
{
set_error( STATUS_BUFFER_OVERFLOW );
return;
}
reply->type = msg->type;
reply->win = msg->win;
reply->msg = msg->msg;
reply->wparam = msg->wparam;
reply->lparam = msg->lparam;
reply->x = msg->x;
reply->y = msg->y;
reply->time = msg->time;
reply->info = msg->info;
/* raw messages always get removed */
if ((msg->type == MSG_HARDWARE_RAW) || (flags & GET_MSG_REMOVE))
{
queue->last_msg = NULL;
if (msg->data)
{
set_reply_data_ptr( msg->data, msg->data_size );
msg->data = NULL;
msg->data_size = 0;
}
remove_queue_message( queue, msg, kind );
}
else /* remember it as the last returned message */
{
if (msg->data) set_reply_data( msg->data, msg->data_size );
queue->last_msg = msg;
queue->last_msg_kind = kind;
}
}
inline static struct message *find_matching_message( const struct message_list *list,
user_handle_t win,
unsigned int first, unsigned int last )
{
struct message *msg;
for (msg = list->first; msg; msg = msg->next)
{
/* check against the filters */
if (msg->msg == WM_QUIT) break; /* WM_QUIT is never filtered */
if (win && msg->win && msg->win != win && !is_child_window( win, msg->win )) continue;
if (msg->msg < first) continue;
if (msg->msg > last) continue;
break; /* found one */
}
return msg;
}
/* get a message from the current queue */
DECL_HANDLER(get_message)
{
struct timer *timer;
struct message *msg;
struct msg_queue *queue = get_current_queue();
user_handle_t get_win = get_user_full_handle( req->get_win );
if (!queue) return;
/* first check for sent messages */
if ((msg = queue->msg_list[SEND_MESSAGE].first))
{
receive_message( queue, msg, reply );
return;
}
if (req->flags & GET_MSG_SENT_ONLY) goto done; /* nothing else to check */
/* if requested, remove the last returned but not yet removed message */
if ((req->flags & GET_MSG_REMOVE_LAST) && queue->last_msg)
remove_queue_message( queue, queue->last_msg, queue->last_msg_kind );
queue->last_msg = NULL;
/* clear changed bits so we can wait on them if we don't find a message */
queue->changed_bits = 0;
/* then check for posted messages */
if ((msg = find_matching_message( &queue->msg_list[POST_MESSAGE], get_win,
req->get_first, req->get_last )))
{
return_message_to_app( queue, req->flags, reply, msg, POST_MESSAGE );
return;
}
/* then check for cooked hardware messages */
if ((msg = find_matching_message( &queue->msg_list[COOKED_HW_MESSAGE], get_win,
req->get_first, req->get_last )))
{
return_message_to_app( queue, req->flags, reply, msg, COOKED_HW_MESSAGE );
return;
}
/* then check for any raw hardware message */
if ((msg = queue->msg_list[RAW_HW_MESSAGE].first))
{
return_message_to_app( queue, req->flags, reply, msg, RAW_HW_MESSAGE );
return;
}
/* now check for WM_PAINT */
if (queue->paint_count &&
(WM_PAINT >= req->get_first) && (WM_PAINT <= req->get_last) &&
(reply->win = find_window_to_repaint( get_win, current )))
{
reply->type = MSG_POSTED;
reply->msg = WM_PAINT;
reply->wparam = 0;
reply->lparam = 0;
reply->x = 0;
reply->y = 0;
reply->time = get_tick_count();
reply->info = 0;
return;
}
/* now check for timer */
if ((timer = find_expired_timer( queue, get_win, req->get_first,
req->get_last, (req->flags & GET_MSG_REMOVE) )))
{
reply->type = MSG_POSTED;
reply->win = timer->win;
reply->msg = timer->msg;
reply->wparam = timer->id;
reply->lparam = timer->lparam;
reply->x = 0;
reply->y = 0;
reply->time = get_tick_count();
reply->info = 0;
return;
}
done:
set_error( STATUS_PENDING ); /* FIXME */
}
/* reply to a sent message */
DECL_HANDLER(reply_message)
{
if (current->queue && current->queue->recv_result)
reply_message( current->queue, req->result, 0, req->remove,
get_req_data(), get_req_data_size() );
else
set_error( STATUS_ACCESS_DENIED );
}
/* retrieve the reply for the last message sent */
DECL_HANDLER(get_message_reply)
{
struct msg_queue *queue = current->queue;
if (queue)
{
struct message_result *result = queue->send_result;
set_error( STATUS_PENDING );
reply->result = 0;
if (result && (result->replied || req->cancel))
{
if (result->replied)
{
reply->result = result->result;
set_error( result->error );
if (result->data)
{
size_t data_len = min( result->data_size, get_reply_max_size() );
set_reply_data_ptr( result->data, data_len );
result->data = NULL;
result->data_size = 0;
}
}
queue->send_result = result->send_next;
result->sender = NULL;
if (!result->receiver) free_result( result );
if (!queue->send_result || !queue->send_result->replied)
clear_queue_bits( queue, QS_SMRESULT );
}
}
else set_error( STATUS_ACCESS_DENIED );
}
/* set a window timer */
DECL_HANDLER(set_win_timer)
{
struct timer *timer;
struct msg_queue *queue = get_current_queue();
user_handle_t win = get_user_full_handle( req->win );
if (!queue) return;
/* remove it if it existed already */
if (win) kill_timer( queue, win, req->msg, req->id );
if ((timer = set_timer( queue, req->rate )))
{
timer->win = win;
timer->msg = req->msg;
timer->id = req->id;
timer->lparam = req->lparam;
}
}
/* kill a window timer */
DECL_HANDLER(kill_win_timer)
{
struct msg_queue *queue = current->queue;
if (!queue || !kill_timer( queue, get_user_full_handle(req->win), req->msg, req->id ))
set_error( STATUS_INVALID_PARAMETER );
}
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