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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* File: ipc/ipc_mqueue.h
* Author: Rich Draves
* Date: 1989
*
* Definitions for message queues.
*/
#ifndef _IPC_IPC_MQUEUE_H_
#define _IPC_IPC_MQUEUE_H_
#include <mach/message.h>
#include <kern/assert.h>
#include <kern/lock.h>
#include <kern/macro_help.h>
#include <ipc/ipc_kmsg.h>
#include <ipc/ipc_thread.h>
typedef struct ipc_mqueue {
decl_simple_lock_data(, imq_lock_data)
struct ipc_kmsg_queue imq_messages;
struct ipc_thread_queue imq_threads;
} *ipc_mqueue_t;
#define IMQ_NULL ((ipc_mqueue_t) 0)
#define imq_lock_init(mq) simple_lock_init(&(mq)->imq_lock_data)
#define imq_lock(mq) simple_lock(&(mq)->imq_lock_data)
#define imq_lock_try(mq) simple_lock_try(&(mq)->imq_lock_data)
#define imq_unlock(mq) simple_unlock(&(mq)->imq_lock_data)
extern void
ipc_mqueue_init(/* ipc_mqueue_t */);
extern void
ipc_mqueue_move(/* ipc_mqueue_t, ipc_mqueue_t, ipc_port_t */);
extern void
ipc_mqueue_changed(/* ipc_mqueue_t, mach_msg_return_t */);
extern mach_msg_return_t
ipc_mqueue_send(/* ipc_kmsg_t, mach_msg_option_t, mach_msg_timeout_t */);
#define IMQ_NULL_CONTINUE ((void (*)()) 0)
extern mach_msg_return_t
ipc_mqueue_receive(/* ipc_mqueue_t, mach_msg_option_t,
mach_msg_size_t, mach_msg_timeout_t,
boolean_t, void (*)(),
ipc_kmsg_t *, mach_port_seqno_t * */);
/*
* extern void
* ipc_mqueue_send_always(ipc_kmsg_t);
*
* Unfortunately, to avoid warnings/lint about unused variables
* when assertions are turned off, we need two versions of this.
*/
#include <kern/assert.h>
#if MACH_ASSERT
#define ipc_mqueue_send_always(kmsg) \
MACRO_BEGIN \
mach_msg_return_t mr; \
\
mr = ipc_mqueue_send((kmsg), MACH_SEND_ALWAYS, \
MACH_MSG_TIMEOUT_NONE); \
assert(mr == MACH_MSG_SUCCESS); \
MACRO_END
#else /* MACH_ASSERT */
#define ipc_mqueue_send_always(kmsg) \
MACRO_BEGIN \
(void) ipc_mqueue_send((kmsg), MACH_SEND_ALWAYS, \
MACH_MSG_TIMEOUT_NONE); \
MACRO_END
#endif /* MACH_ASSERT */
#endif /* _IPC_IPC_MQUEUE_H_ */
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