130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*
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* Server-side message queues
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*
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* Copyright (C) 2000 Alexandre Julliard
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*/
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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 "handle.h"
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#include "thread.h"
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#include "process.h"
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#include "request.h"
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struct msg_queue
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{
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struct object obj; /* object header */
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struct thread *thread; /* thread owning this queue */
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int signaled; /* queue has been signaled */
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};
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static void msg_queue_dump( struct object *obj, int verbose );
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static int msg_queue_add_queue( struct object *obj, struct wait_queue_entry *entry );
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static void msg_queue_remove_queue( struct object *obj, struct wait_queue_entry *entry );
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static int msg_queue_signaled( struct object *obj, struct thread *thread );
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static int msg_queue_satisfied( struct object *obj, struct thread *thread );
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static const struct object_ops msg_queue_ops =
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{
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sizeof(struct msg_queue), /* size */
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msg_queue_dump, /* dump */
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msg_queue_add_queue, /* add_queue */
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msg_queue_remove_queue, /* remove_queue */
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msg_queue_signaled, /* signaled */
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msg_queue_satisfied, /* satisfied */
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NULL, /* get_poll_events */
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NULL, /* poll_event */
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no_get_fd, /* get_fd */
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no_flush, /* flush */
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no_get_file_info, /* get_file_info */
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no_destroy /* destroy */
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};
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static struct msg_queue *create_msg_queue( struct thread *thread )
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{
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struct msg_queue *queue;
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if ((queue = alloc_object( &msg_queue_ops, -1 )))
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{
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queue->signaled = 0;
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queue->thread = thread;
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thread->queue = queue;
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if (!thread->process->queue)
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thread->process->queue = (struct msg_queue *)grab_object( queue );
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}
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return queue;
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}
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static int msg_queue_add_queue( struct object *obj, struct wait_queue_entry *entry )
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{
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struct msg_queue *queue = (struct msg_queue *)obj;
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struct process *process = entry->thread->process;
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/* if waiting on the main process queue, set the idle event */
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if (entry->thread == queue->thread && process->queue == queue)
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{
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if (process->idle_event) set_event( process->idle_event );
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}
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add_queue( obj, entry );
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return 1;
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}
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static void msg_queue_remove_queue(struct object *obj, struct wait_queue_entry *entry )
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{
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struct msg_queue *queue = (struct msg_queue *)obj;
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struct process *process = entry->thread->process;
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remove_queue( obj, entry );
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/* if waiting on the main process queue, reset the idle event */
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if (entry->thread == queue->thread && process->queue == queue)
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{
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if (process->idle_event) reset_event( process->idle_event );
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}
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}
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static void msg_queue_dump( struct object *obj, int verbose )
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{
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struct msg_queue *queue = (struct msg_queue *)obj;
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fprintf( stderr, "Msg queue signaled=%d owner=%p\n", queue->signaled, queue->thread );
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}
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static int msg_queue_signaled( struct object *obj, struct thread *thread )
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{
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struct msg_queue *queue = (struct msg_queue *)obj;
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return queue->signaled;
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}
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static int msg_queue_satisfied( struct object *obj, struct thread *thread )
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{
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struct msg_queue *queue = (struct msg_queue *)obj;
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queue->signaled = 0;
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return 0; /* Not abandoned */
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}
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/* get the message queue of the current thread */
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DECL_HANDLER(get_msg_queue)
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{
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struct msg_queue *queue = current->queue;
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req->handle = -1;
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if (!queue) queue = create_msg_queue( current );
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if (queue) req->handle = alloc_handle( current->process, queue, SYNCHRONIZE, 0 );
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}
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/* wake up a message queue */
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DECL_HANDLER(wake_queue)
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{
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struct msg_queue *queue = (struct msg_queue *)get_handle_obj( current->process, req->handle,
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0, &msg_queue_ops );
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if (queue)
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{
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queue->signaled = 1;
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wake_up( &queue->obj, 0 );
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release_object( queue );
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}
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}
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