Sweden-Number/server/queue.c

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/*
* Server-side message queues
*
* Copyright (C) 2000 Alexandre Julliard
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "handle.h"
#include "thread.h"
#include "process.h"
#include "request.h"
struct msg_queue
{
struct object obj; /* object header */
struct thread *thread; /* thread owning this queue */
int signaled; /* queue has been signaled */
};
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 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 */
no_destroy /* destroy */
};
static struct msg_queue *create_msg_queue( struct thread *thread )
{
struct msg_queue *queue;
if ((queue = alloc_object( &msg_queue_ops, -1 )))
{
queue->signaled = 0;
queue->thread = thread;
thread->queue = queue;
if (!thread->process->queue)
thread->process->queue = (struct msg_queue *)grab_object( queue );
}
return queue;
}
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;
/* if waiting on the main process queue, set the idle event */
if (entry->thread == queue->thread && 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 );
/* if waiting on the main process queue, reset the idle event */
if (entry->thread == queue->thread && 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 signaled=%d owner=%p\n", queue->signaled, queue->thread );
}
static int msg_queue_signaled( struct object *obj, struct thread *thread )
{
struct msg_queue *queue = (struct msg_queue *)obj;
return queue->signaled;
}
static int msg_queue_satisfied( struct object *obj, struct thread *thread )
{
struct msg_queue *queue = (struct msg_queue *)obj;
queue->signaled = 0;
return 0; /* Not abandoned */
}
/* get the message queue of the current thread */
DECL_HANDLER(get_msg_queue)
{
struct msg_queue *queue = current->queue;
req->handle = -1;
if (!queue) queue = create_msg_queue( current );
if (queue) req->handle = alloc_handle( current->process, queue, SYNCHRONIZE, 0 );
}
/* wake up a message queue */
DECL_HANDLER(wake_queue)
{
struct msg_queue *queue = (struct msg_queue *)get_handle_obj( current->process, req->handle,
0, &msg_queue_ops );
if (queue)
{
queue->signaled = 1;
wake_up( &queue->obj, 0 );
release_object( queue );
}
}