[apple/xnu.git] / osfmk / ipc / ipc_mqueue.h

/*
 * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * 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_assert.h>

#include <mach/message.h>

#include <kern/assert.h>
#include <kern/macro_help.h>
#include <kern/kern_types.h>
#include <kern/spl.h>
#include <kern/wait_queue.h>

#include <ipc/ipc_kmsg.h>
#include <ipc/ipc_object.h>
#include <ipc/ipc_types.h>

#include <sys/event.h>

typedef struct ipc_mqueue {
	union {
		struct {
			struct  wait_queue	wait_queue;	
			struct ipc_kmsg_queue	messages;
			mach_port_msgcount_t	msgcount;
			mach_port_msgcount_t	qlimit;
			mach_port_seqno_t 	seqno;
			mach_port_name_t	receiver_name;
			boolean_t		fullwaiters;
		} port;
		struct {
			struct wait_queue_set	set_queue;
			mach_port_name_t	local_name;
		} pset;
	} data;
} *ipc_mqueue_t;

#define	IMQ_NULL		((ipc_mqueue_t) 0)

#define imq_wait_queue		data.port.wait_queue
#define imq_messages		data.port.messages
#define imq_msgcount		data.port.msgcount
#define imq_qlimit		data.port.qlimit
#define imq_seqno		data.port.seqno
#define imq_receiver_name	data.port.receiver_name
#define imq_fullwaiters		data.port.fullwaiters

#define imq_set_queue		data.pset.set_queue
#define imq_setlinks		data.pset.set_queue.wqs_setlinks
#define imq_preposts		data.pset.set_queue.wqs_preposts
#define imq_local_name		data.pset.local_name
#define imq_is_set(mq)		wait_queue_is_set(&(mq)->imq_set_queue)

#define	imq_lock(mq)		wait_queue_lock(&(mq)->imq_wait_queue)
#define	imq_lock_try(mq)	wait_queue_lock_try(&(mq)->imq_wait_queue)
#define	imq_unlock(mq)		wait_queue_unlock(&(mq)->imq_wait_queue)
#define imq_held(mq)		wait_queue_held(&(mq)->imq_wait_queue)

#define imq_full(mq)		((mq)->imq_msgcount >= (mq)->imq_qlimit)
#define imq_full_kernel(mq)	((mq)->imq_msgcount >= MACH_PORT_QLIMIT_KERNEL)

extern int ipc_mqueue_full;
// extern int ipc_mqueue_rcv;

#define IPC_MQUEUE_FULL		CAST_EVENT64_T(&ipc_mqueue_full)
#define IPC_MQUEUE_RECEIVE	NO_EVENT64

/*
 * Exported interfaces
 */

/* Initialize a newly-allocated message queue */
extern void ipc_mqueue_init(
	ipc_mqueue_t		mqueue,
	boolean_t		is_set);

/* destroy an mqueue */
extern void ipc_mqueue_destroy(
	ipc_mqueue_t		mqueue);

/* Wake up receivers waiting in a message queue */
extern void ipc_mqueue_changed(
	ipc_mqueue_t		mqueue);

/* Add the specific mqueue as a member of the set */
extern kern_return_t ipc_mqueue_add(
	ipc_mqueue_t		mqueue,
	ipc_mqueue_t	 	set_mqueue);

/* Check to see if mqueue is member of set_mqueue */
extern boolean_t ipc_mqueue_member(
	ipc_mqueue_t		mqueue,
	ipc_mqueue_t		set_mqueue);

/* Remove an mqueue from a specific set */
extern kern_return_t ipc_mqueue_remove(
	ipc_mqueue_t	 	mqueue,
	ipc_mqueue_t		set_mqueue);

/* Remove an mqueue from all sets */
extern void ipc_mqueue_remove_from_all(
	ipc_mqueue_t		mqueue);

/* Remove all the members of the specifiied set */
extern void ipc_mqueue_remove_all(
	ipc_mqueue_t		mqueue);

/* Send a message to a port */
extern mach_msg_return_t ipc_mqueue_send(
	ipc_mqueue_t		mqueue,
	ipc_kmsg_t		kmsg,
	mach_msg_option_t	option,
	mach_msg_timeout_t	timeout_val,
	spl_t			s);

/* Deliver message to message queue or waiting receiver */
extern void ipc_mqueue_post(
	ipc_mqueue_t		mqueue,
	ipc_kmsg_t		kmsg);

/* Receive a message from a message queue */
extern void ipc_mqueue_receive(
	ipc_mqueue_t		mqueue,
	mach_msg_option_t	option,
	mach_msg_size_t		max_size,
	mach_msg_timeout_t	timeout_val,
	int                     interruptible);

/* Receive a message from a message queue using a specified thread */
extern wait_result_t ipc_mqueue_receive_on_thread(
        ipc_mqueue_t            mqueue,
	mach_msg_option_t       option,
	mach_msg_size_t         max_size,
	mach_msg_timeout_t      rcv_timeout,
	int                     interruptible,
	thread_t                thread);

/* Continuation routine for message receive */
extern void ipc_mqueue_receive_continue(
	void			*param,
	wait_result_t		wresult);

/* Select a message from a queue and try to post it to ourself */
extern void ipc_mqueue_select_on_thread(
	ipc_mqueue_t		mqueue,
	mach_msg_option_t	option,
	mach_msg_size_t		max_size,
	thread_t                thread);

/* Peek into a messaqe queue to see if there are messages */
extern unsigned ipc_mqueue_peek(
	ipc_mqueue_t		mqueue);

/* Clear a message count reservation */
extern void ipc_mqueue_release_msgcount(
	ipc_mqueue_t		mqueue);

/* Change a queue limit */
extern void ipc_mqueue_set_qlimit(
	ipc_mqueue_t		mqueue,
	mach_port_msgcount_t	qlimit);

/* Change a queue's sequence number */
extern void ipc_mqueue_set_seqno(
	ipc_mqueue_t		mqueue, 
	mach_port_seqno_t 	seqno);

/* Convert a name in a space to a message queue */
extern mach_msg_return_t ipc_mqueue_copyin(
	ipc_space_t		space,
	mach_port_name_t	name,
	ipc_mqueue_t		*mqueuep,
	ipc_object_t		*objectp);

#endif	/* _IPC_IPC_MQUEUE_H_ */
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
1c79356b	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* @OSF_COPYRIGHT@
	30	*/
	31	/*
	32	* Mach Operating System
	33	* Copyright (c) 1991,1990,1989 Carnegie Mellon University
	34	* All Rights Reserved.
	35	*
	36	* Permission to use, copy, modify and distribute this software and its
	37	* documentation is hereby granted, provided that both the copyright
	38	* notice and this permission notice appear in all copies of the
	39	* software, derivative works or modified versions, and any portions
	40	* thereof, and that both notices appear in supporting documentation.
	41	*
	42	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	43	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	44	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	45	*
	46	* Carnegie Mellon requests users of this software to return to
	47	*
	48	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	49	* School of Computer Science
	50	* Carnegie Mellon University
	51	* Pittsburgh PA 15213-3890
	52	*
	53	* any improvements or extensions that they make and grant Carnegie Mellon
	54	* the rights to redistribute these changes.
	55	*/
	56	/*
	57	*/
	58	/*
	59	* File: ipc/ipc_mqueue.h
	60	* Author: Rich Draves
	61	* Date: 1989
	62	*
	63	* Definitions for message queues.
	64	*/
	65
	66	#ifndef _IPC_IPC_MQUEUE_H_
	67	#define _IPC_IPC_MQUEUE_H_
	68
	69	#include <mach_assert.h>
	70
	71	#include <mach/message.h>
	72
	73	#include <kern/assert.h>
	74	#include <kern/macro_help.h>
91447636	75	#include <kern/kern_types.h>
b0d623f7	76	#include <kern/spl.h>
1c79356b A	77	#include <kern/wait_queue.h>
	78
	79	#include <ipc/ipc_kmsg.h>
	80	#include <ipc/ipc_object.h>
	81	#include <ipc/ipc_types.h>
	82
b0d623f7 A	83	#include <sys/event.h>
b0d623f7 A	84
1c79356b A	85	typedef struct ipc_mqueue {
	86	union {
	87	struct {
	88	struct wait_queue wait_queue;
	89	struct ipc_kmsg_queue messages;
	90	mach_port_msgcount_t msgcount;
	91	mach_port_msgcount_t qlimit;
b0d623f7 A	92	mach_port_seqno_t seqno;
b0d623f7 A	93	mach_port_name_t receiver_name;
1c79356b A	94	boolean_t fullwaiters;
1c79356b A	95	} port;
b0d623f7 A	96	struct {
	97	struct wait_queue_set set_queue;
	98	mach_port_name_t local_name;
	99	} pset;
1c79356b A	100	} data;
	101	} *ipc_mqueue_t;
	102
	103	#define IMQ_NULL ((ipc_mqueue_t) 0)
	104
	105	#define imq_wait_queue data.port.wait_queue
	106	#define imq_messages data.port.messages
	107	#define imq_msgcount data.port.msgcount
	108	#define imq_qlimit data.port.qlimit
	109	#define imq_seqno data.port.seqno
b0d623f7	110	#define imq_receiver_name data.port.receiver_name
1c79356b A	111	#define imq_fullwaiters data.port.fullwaiters
1c79356b A	112
b0d623f7 A	113	#define imq_set_queue data.pset.set_queue
	114	#define imq_setlinks data.pset.set_queue.wqs_setlinks
	115	#define imq_preposts data.pset.set_queue.wqs_preposts
	116	#define imq_local_name data.pset.local_name
9bccf70c	117	#define imq_is_set(mq) wait_queue_is_set(&(mq)->imq_set_queue)
1c79356b A	118
	119	#define imq_lock(mq) wait_queue_lock(&(mq)->imq_wait_queue)
	120	#define imq_lock_try(mq) wait_queue_lock_try(&(mq)->imq_wait_queue)
	121	#define imq_unlock(mq) wait_queue_unlock(&(mq)->imq_wait_queue)
	122	#define imq_held(mq) wait_queue_held(&(mq)->imq_wait_queue)
	123
	124	#define imq_full(mq) ((mq)->imq_msgcount >= (mq)->imq_qlimit)
c910b4d9	125	#define imq_full_kernel(mq) ((mq)->imq_msgcount >= MACH_PORT_QLIMIT_KERNEL)
1c79356b A	126
1c79356b A	127	extern int ipc_mqueue_full;
b0d623f7	128	// extern int ipc_mqueue_rcv;
1c79356b	129
cf7d32b8	130	#define IPC_MQUEUE_FULL CAST_EVENT64_T(&ipc_mqueue_full)
b0d623f7	131	#define IPC_MQUEUE_RECEIVE NO_EVENT64
1c79356b A	132
	133	/*
	134	* Exported interfaces
	135	*/
	136
	137	/* Initialize a newly-allocated message queue */
	138	extern void ipc_mqueue_init(
91447636 A	139	ipc_mqueue_t mqueue,
	140	boolean_t is_set);
	141
	142	/* destroy an mqueue */
	143	extern void ipc_mqueue_destroy(
	144	ipc_mqueue_t mqueue);
1c79356b	145
1c79356b A	146	/* Wake up receivers waiting in a message queue */
	147	extern void ipc_mqueue_changed(
	148	ipc_mqueue_t mqueue);
	149
91447636 A	150	/* Add the specific mqueue as a member of the set */
	151	extern kern_return_t ipc_mqueue_add(
	152	ipc_mqueue_t mqueue,
	153	ipc_mqueue_t set_mqueue);
	154
	155	/* Check to see if mqueue is member of set_mqueue */
	156	extern boolean_t ipc_mqueue_member(
	157	ipc_mqueue_t mqueue,
	158	ipc_mqueue_t set_mqueue);
	159
	160	/* Remove an mqueue from a specific set */
	161	extern kern_return_t ipc_mqueue_remove(
	162	ipc_mqueue_t mqueue,
	163	ipc_mqueue_t set_mqueue);
	164
	165	/* Remove an mqueue from all sets */
	166	extern void ipc_mqueue_remove_from_all(
	167	ipc_mqueue_t mqueue);
	168
	169	/* Remove all the members of the specifiied set */
	170	extern void ipc_mqueue_remove_all(
	171	ipc_mqueue_t mqueue);
	172
1c79356b A	173	/* Send a message to a port */
	174	extern mach_msg_return_t ipc_mqueue_send(
	175	ipc_mqueue_t mqueue,
	176	ipc_kmsg_t kmsg,
	177	mach_msg_option_t option,
b0d623f7 A	178	mach_msg_timeout_t timeout_val,
b0d623f7 A	179	spl_t s);
1c79356b A	180
	181	/* Deliver message to message queue or waiting receiver */
	182	extern void ipc_mqueue_post(
	183	ipc_mqueue_t mqueue,
	184	ipc_kmsg_t kmsg);
	185
	186	/* Receive a message from a message queue */
	187	extern void ipc_mqueue_receive(
	188	ipc_mqueue_t mqueue,
	189	mach_msg_option_t option,
	190	mach_msg_size_t max_size,
91447636	191	mach_msg_timeout_t timeout_val,
1c79356b A	192	int interruptible);
1c79356b A	193
b0d623f7 A	194	/* Receive a message from a message queue using a specified thread */
	195	extern wait_result_t ipc_mqueue_receive_on_thread(
	196	ipc_mqueue_t mqueue,
	197	mach_msg_option_t option,
	198	mach_msg_size_t max_size,
	199	mach_msg_timeout_t rcv_timeout,
	200	int interruptible,
	201	thread_t thread);
	202
1c79356b	203	/* Continuation routine for message receive */
91447636 A	204	extern void ipc_mqueue_receive_continue(
	205	void *param,
	206	wait_result_t wresult);
1c79356b A	207
1c79356b A	208	/* Select a message from a queue and try to post it to ourself */
b0d623f7	209	extern void ipc_mqueue_select_on_thread(
1c79356b A	210	ipc_mqueue_t mqueue,
1c79356b A	211	mach_msg_option_t option,
b0d623f7 A	212	mach_msg_size_t max_size,
	213	thread_t thread);
	214
	215	/* Peek into a messaqe queue to see if there are messages */
6d2010ae	216	extern unsigned ipc_mqueue_peek(
b0d623f7	217	ipc_mqueue_t mqueue);
1c79356b A	218
	219	/* Clear a message count reservation */
	220	extern void ipc_mqueue_release_msgcount(
	221	ipc_mqueue_t mqueue);
	222
	223	/* Change a queue limit */
	224	extern void ipc_mqueue_set_qlimit(
	225	ipc_mqueue_t mqueue,
	226	mach_port_msgcount_t qlimit);
	227
	228	/* Change a queue's sequence number */
	229	extern void ipc_mqueue_set_seqno(
	230	ipc_mqueue_t mqueue,
	231	mach_port_seqno_t seqno);
	232
	233	/* Convert a name in a space to a message queue */
	234	extern mach_msg_return_t ipc_mqueue_copyin(
	235	ipc_space_t space,
	236	mach_port_name_t name,
	237	ipc_mqueue_t *mqueuep,
	238	ipc_object_t *objectp);
	239
	240	#endif /* _IPC_IPC_MQUEUE_H_ */