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

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/*
 * @OSF_COPYRIGHT@
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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_pset.h
 *	Author:	Rich Draves
 *	Date:	1989
 *
 *	Definitions for port sets.
 */

#ifndef _IPC_IPC_PSET_H_
#define _IPC_IPC_PSET_H_

#include <mach/mach_types.h>
#include <mach/port.h>
#include <mach/kern_return.h>
#include <kern/kern_types.h>
#include <ipc/ipc_types.h>
#include <ipc/ipc_object.h>
#include <ipc/ipc_mqueue.h>

struct ipc_pset {
	/*
	 * Initial sub-structure in common with all ipc_objects.
	 */
	struct ipc_object       ips_object;
	struct ipc_mqueue       ips_messages;
};

#define ips_references          ips_object.io_references

#define ips_object_to_pset(io)  __container_of(io, struct ipc_pset, ips_object)
#define ips_to_object(pset)     (&(pset)->ips_object)
#define ips_active(pset)        io_active(ips_to_object(pset))
#define ips_lock(pset)          io_lock(ips_to_object(pset))
#define ips_lock_try(pset)      io_lock_try(ips_to_object(pset))
#define ips_lock_held_kdp(pset) io_lock_held_kdp(ips_to_object(pset))
#define ips_unlock(pset)        io_unlock(ips_to_object(pset))
#define ips_reference(pset)     io_reference(ips_to_object(pset))
#define ips_release(pset)       io_release(ips_to_object(pset))

/* get an ipc_pset pointer from an ipc_mqueue pointer */
#define ips_from_mq(mq) \
	        __container_of(mq, struct ipc_pset, ips_messages)

/* Allocate a port set */
extern kern_return_t ipc_pset_alloc(
	ipc_space_t             space,
	mach_port_name_t        *namep,
	ipc_pset_t              *psetp);

/* Allocate a port set, with a specific name */
extern kern_return_t ipc_pset_alloc_name(
	ipc_space_t             space,
	mach_port_name_t        name,
	ipc_pset_t              *psetp);

/* Allocate a port set in a special space */
extern ipc_pset_t ipc_pset_alloc_special(
	ipc_space_t             space);

/* Add a port to a port set */
extern kern_return_t ipc_pset_add(
	ipc_pset_t      pset,
	ipc_port_t      port,
	uint64_t        *reserved_link,
	uint64_t        *reserved_prepost);

/* determine if port is a member of set */
extern boolean_t ipc_pset_member(
	ipc_pset_t      pset,
	ipc_port_t      port);

/* Remove a port from a port set */
extern kern_return_t ipc_pset_remove(
	ipc_pset_t      pset,
	ipc_port_t      port);

/* lazily initialize the wqset of a port set */
extern kern_return_t ipc_pset_lazy_allocate(
	ipc_space_t      space,
	mach_port_name_t psname);

/* Remove a port from all its current port sets */
extern kern_return_t ipc_pset_remove_from_all(
	ipc_port_t      port);

/* Destroy a port_set */
extern void ipc_pset_destroy(
	ipc_space_t     space,
	ipc_pset_t      pset);

#if MACH_KERNEL_PRIVATE
extern struct turnstile *filt_ipc_kqueue_turnstile(
	struct knote *kn);
bool
filt_machport_kqueue_has_turnstile(
	struct knote *kn);

extern void filt_machport_turnstile_prepare_lazily(
	struct knote *kn,
	mach_msg_type_name_t    msgt_name,
	ipc_port_t port);

extern struct turnstile *filt_machport_stash_port(
	struct knote *kn,
	ipc_port_t port,
	int *link);
#endif

#endif  /* _IPC_IPC_PSET_H_ */