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/* message-buffer.h - Interface for managing messaging data structures.
Copyright (C) 2008 Free Software Foundation, Inc.
Written by Neal H. Walfield <neal@gnu.org>.
This file is part of the GNU Hurd.
GNU Hurd 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 3 of the
License, or (at your option) any later version.
GNU Hurd 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 GNU Hurd. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef __have_hurd_message_buffer
# define __have_hurd_message_buffer
# include <stdint.h>
# include <stdbool.h>
# include <viengoos/addr.h>
/* Forward. */
struct vg_message;
#define HURD_MESSAGE_BUFFER_MAGIC 0x111A61C
struct hurd_message_buffer
{
uintptr_t magic;
struct hurd_message_buffer *next;
/* A messenger associated REQUEST. The messenger's identifier is
set to the data structure's address. */
vg_addr_t sender;
struct vg_message *request;
/* A messenger associated with REPLY. The messenger's identifier is
set to the data structure's address. */
vg_addr_t receiver_strong;
/* A weakened version. */
vg_addr_t receiver;
struct vg_message *reply;
/* If not NULL, then this routine is called. */
void (*closure) (struct hurd_message_buffer *mb);
/* XXX: Whether the activation should resume the thread or simply
free the buffer. Ignored if callback is not NULL. */
bool just_free;
void *cookie;
};
#endif /* __have_hurd_message_buffer */
#ifdef __need_hurd_message_buffer
# undef __need_hurd_message_buffer
#else
# ifndef _HURD_MESSAGE_BUFFER
# define _HURD_MESSAGE_BUFFER
/* Allocate a message buffer. */
extern struct hurd_message_buffer *hurd_message_buffer_alloc (void);
/* Allocate a message buffer, which is unlikely to be freed soon. */
extern struct hurd_message_buffer *hurd_message_buffer_alloc_long (void);
/* Free a message buffer. */
extern void hurd_message_buffer_free (struct hurd_message_buffer *buf);
# endif /* _HURD_MESSAGE_BUFFER */
#endif /* !__need_hurd_message_buffer */
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