task.h   [plain text]

/*
 * Copyright (c) 2000-2010, 2015 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_FREE_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988 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:	task.h
 *	Author:	Avadis Tevanian, Jr.
 *
 *	This file contains the structure definitions for tasks.
 *
 */
/*
 * Copyright (c) 1993 The University of Utah and
 * the Computer Systems Laboratory (CSL).  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.
 *
 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
 * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * CSL requests users of this software to return to csl-dist@cs.utah.edu any
 * improvements that they make and grant CSL redistribution rights.
 *
 */
/*
 * NOTICE: This file was modified by McAfee Research in 2004 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 * Copyright (c) 2005 SPARTA, Inc.
 */

#ifndef	_KERN_TASK_H_
#define _KERN_TASK_H_

#include <kern/kern_types.h>
#include <mach/mach_types.h>
#include <sys/cdefs.h>

#ifdef XNU_KERNEL_PRIVATE
#include <kern/kern_cdata.h>
#include <mach/sfi_class.h>
#include <kern/queue.h>
#endif /* XNU_KERNEL_PRIVATE */

#ifdef	MACH_KERNEL_PRIVATE

#include <mach/boolean.h>
#include <mach/port.h>
#include <mach/time_value.h>
#include <mach/message.h>
#include <mach/mach_param.h>
#include <mach/task_info.h>
#include <mach/exception_types.h>
#include <mach/vm_statistics.h>
#include <machine/task.h>

#include <kern/cpu_data.h>
#include <kern/queue.h>
#include <kern/exception.h>
#include <kern/locks.h>
#include <security/_label.h>
#include <ipc/ipc_port.h>

#include <kern/thread.h>
#include <mach/coalition.h>

#ifdef CONFIG_ATM
#include <atm/atm_internal.h>
#endif

struct _cpu_time_qos_stats {
        uint64_t cpu_time_qos_default;
        uint64_t cpu_time_qos_maintenance;
        uint64_t cpu_time_qos_background;
        uint64_t cpu_time_qos_utility;
        uint64_t cpu_time_qos_legacy;
        uint64_t cpu_time_qos_user_initiated;
        uint64_t cpu_time_qos_user_interactive;
};

#ifdef CONFIG_BANK
#include <bank/bank_internal.h>
#endif

struct task {
	/* Synchronization/destruction information */
	decl_lck_mtx_data(,lock)		/* Task's lock */
	uint32_t	ref_count;	/* Number of references to me */
	boolean_t	active;		/* Task has not been terminated */
	boolean_t	halting;	/* Task is being halted */

	/* Miscellaneous */
	vm_map_t	map;		/* Address space description */
	queue_chain_t	tasks;	/* global list of tasks */
	void		*user_data;	/* Arbitrary data settable via IPC */

#if defined(CONFIG_SCHED_MULTIQ)
	sched_group_t sched_group;
#endif /* defined(CONFIG_SCHED_MULTIQ) */

	/* Threads in this task */
	queue_head_t		threads;

	processor_set_t		pset_hint;
	struct affinity_space	*affinity_space;

	int			thread_count;
	uint32_t		active_thread_count;
	int			suspend_count;	/* Internal scheduling only */

	/* User-visible scheduling information */
	integer_t		user_stop_count;	/* outstanding stops */
	integer_t		legacy_stop_count;	/* outstanding legacy stops */

	integer_t		priority;			/* base priority for threads */
	integer_t		max_priority;		/* maximum priority for threads */

	integer_t		importance;		/* priority offset (BSD 'nice' value) */

	/* Task security and audit tokens */
	security_token_t sec_token;
	audit_token_t	audit_token;
        
	/* Statistics */
	uint64_t		total_user_time;	/* terminated threads only */
	uint64_t		total_system_time;
	
	/* Virtual timers */
	uint32_t		vtimers;

	/* IPC structures */
	decl_lck_mtx_data(,itk_lock_data)
	struct ipc_port *itk_self;	/* not a right, doesn't hold ref */
	struct ipc_port *itk_nself;	/* not a right, doesn't hold ref */
	struct ipc_port *itk_sself;	/* a send right */
	struct exception_action exc_actions[EXC_TYPES_COUNT];
		 			/* a send right each valid element  */
	struct ipc_port *itk_host;	/* a send right */
	struct ipc_port *itk_bootstrap;	/* a send right */
	struct ipc_port *itk_seatbelt;	/* a send right */
	struct ipc_port *itk_gssd;	/* yet another send right */
	struct ipc_port *itk_debug_control; /* send right for debugmode communications */
	struct ipc_port *itk_task_access; /* and another send right */ 
	struct ipc_port *itk_resume;	/* a receive right to resume this task */
	struct ipc_port *itk_registered[TASK_PORT_REGISTER_MAX];
					/* all send rights */

	struct ipc_space *itk_space;

	/* Synchronizer ownership information */
	queue_head_t	semaphore_list;		/* list of owned semaphores   */
	int		semaphores_owned;	/* number of semaphores owned */

	ledger_t	ledger;

	unsigned int	priv_flags;			/* privilege resource flags */
#define VM_BACKING_STORE_PRIV	0x1

	MACHINE_TASK
        
	integer_t faults;              /* faults counter */
        integer_t pageins;             /* pageins counter */
        integer_t cow_faults;          /* copy on write fault counter */
        integer_t messages_sent;       /* messages sent counter */
        integer_t messages_received;   /* messages received counter */
        integer_t syscalls_mach;       /* mach system call counter */
        integer_t syscalls_unix;       /* unix system call counter */
		uint32_t  c_switch;			   /* total context switches */
		uint32_t  p_switch;			   /* total processor switches */
		uint32_t  ps_switch;		   /* total pset switches */

#ifdef  MACH_BSD 
	void *bsd_info;
#endif  
	kcdata_descriptor_t		corpse_info;
	void *				corpse_info_kernel;
	queue_chain_t			corpse_tasks;
#ifdef CONFIG_MACF
	struct label *			crash_label;
#endif
	struct vm_shared_region		*shared_region;
	volatile uint32_t t_flags;                                      /* general-purpose task flags protected by task_lock (TL) */
#define TF_NONE                 0
#define TF_64B_ADDR             0x00000001                              /* task has 64-bit addressing */
#define TF_64B_DATA             0x00000002                              /* task has 64-bit data registers */
#define TF_CPUMON_WARNING       0x00000004                              /* task has at least one thread in CPU usage warning zone */
#define TF_WAKEMON_WARNING      0x00000008                              /* task is in wakeups monitor warning zone */
#define TF_TELEMETRY            (TF_CPUMON_WARNING | TF_WAKEMON_WARNING) /* task is a telemetry participant */
#define TF_GPU_DENIED           0x00000010                              /* task is not allowed to access the GPU */
#define TF_CORPSE               0x00000020                              /* task is a corpse */
#define TF_PENDING_CORPSE       0x00000040                              /* task corpse has not been reported yet */
#define TF_CORPSE_FORK          0x00000080                              /* task is a forked corpse */
#define TF_LRETURNWAIT          0x00000100                              /* task is waiting for fork/posix_spawn/exec to complete */
#define TF_LRETURNWAITER        0x00000200                              /* task is waiting for TF_LRETURNWAIT to get cleared */


#define task_has_64BitAddr(task)	\
	 (((task)->t_flags & TF_64B_ADDR) != 0)
#define task_set_64BitAddr(task)	\
	 ((task)->t_flags |= TF_64B_ADDR)
#define task_clear_64BitAddr(task)	\
	 ((task)->t_flags &= ~TF_64B_ADDR)
#define task_has_64BitData(task)    \
	 (((task)->t_flags & TF_64B_DATA) != 0)

#define task_is_a_corpse(task)      \
	 (((task)->t_flags & TF_CORPSE) != 0)

#define task_set_corpse(task)       \
	 ((task)->t_flags |= TF_CORPSE)

#define task_corpse_pending_report(task) 	\
	 (((task)->t_flags & TF_PENDING_CORPSE) != 0)

#define task_set_corpse_pending_report(task)       \
	 ((task)->t_flags |= TF_PENDING_CORPSE)

#define task_clear_corpse_pending_report(task)       \
	 ((task)->t_flags &= ~TF_PENDING_CORPSE)

#define task_is_a_corpse_fork(task)	\
	(((task)->t_flags & TF_CORPSE_FORK) != 0)

	uint32_t t_procflags;                                            /* general-purpose task flags protected by proc_lock (PL) */
#define TPF_NONE                 0
#define TPF_DID_EXEC             0x00000001                              /* task has been execed to a new task */
#define TPF_EXEC_COPY            0x00000002                              /* task is the new copy of an exec */

#define task_did_exec_internal(task)		\
	(((task)->t_procflags & TPF_DID_EXEC) != 0)

#define task_is_exec_copy_internal(task)	\
	(((task)->t_procflags & TPF_EXEC_COPY) != 0)

	mach_vm_address_t	all_image_info_addr; /* dyld __all_image_info     */
	mach_vm_size_t		all_image_info_size; /* section location and size */

#if KPERF
#define TASK_PMC_FLAG			0x1	/* Bit in "t_chud" signifying PMC interest */
#define TASK_KPC_FORCED_ALL_CTRS	0x2	/* Bit in "t_chud" signifying KPC forced all counters */

	uint32_t t_chud;		/* CHUD flags, used for Shark */
#endif

	boolean_t pidsuspended; /* pid_suspend called; no threads can execute */
	boolean_t frozen;       /* frozen; private resident pages committed to swap */
	boolean_t changing_freeze_state;	/* in the process of freezing or thawing */
	uint16_t policy_ru_cpu          :4,
	         policy_ru_cpu_ext      :4,
	         applied_ru_cpu         :4,
	         applied_ru_cpu_ext     :4;
	uint8_t  rusage_cpu_flags;
	uint8_t  rusage_cpu_percentage;		/* Task-wide CPU limit percentage */
	uint64_t rusage_cpu_interval;		/* Task-wide CPU limit interval */
	uint8_t  rusage_cpu_perthr_percentage;  /* Per-thread CPU limit percentage */
	uint64_t rusage_cpu_perthr_interval;    /* Per-thread CPU limit interval */
	uint64_t rusage_cpu_deadline;
	thread_call_t rusage_cpu_callt;

#if CONFIG_ATM
	struct atm_task_descriptor *atm_context;  /* pointer to per task atm descriptor */
#endif
#if CONFIG_BANK
	struct bank_task *bank_context;  /* pointer to per task bank structure */
#endif

#if IMPORTANCE_INHERITANCE
	struct ipc_importance_task  *task_imp_base;	/* Base of IPC importance chain */
#endif /* IMPORTANCE_INHERITANCE */

	vm_extmod_statistics_data_t	extmod_statistics;

#if MACH_ASSERT
	int8_t		suspends_outstanding;	/* suspends this task performed in excess of resumes */
#endif

	struct task_requested_policy requested_policy;
	struct task_effective_policy effective_policy;

	/*
	 * Can be merged with imp_donor bits, once the IMPORTANCE_INHERITANCE macro goes away.
	 */
	uint32_t        low_mem_notified_warn		:1,	/* warning low memory notification is sent to the task */
	                low_mem_notified_critical	:1,	/* critical low memory notification is sent to the task */
	                purged_memory_warn		:1,	/* purgeable memory of the task is purged for warning level pressure */
	                purged_memory_critical		:1,	/* purgeable memory of the task is purged for critical level pressure */
			low_mem_privileged_listener	:1,	/* if set, task would like to know about pressure changes before other tasks on the system */
	                mem_notify_reserved		:27;	/* reserved for future use */

	io_stat_info_t 		task_io_stats;
	uint64_t 		task_immediate_writes __attribute__((aligned(8)));
	uint64_t 		task_deferred_writes __attribute__((aligned(8)));
	uint64_t 		task_invalidated_writes __attribute__((aligned(8)));
	uint64_t 		task_metadata_writes __attribute__((aligned(8)));

	/* 
	 * The cpu_time_qos_stats fields are protected by the task lock
	 */
	struct _cpu_time_qos_stats 	cpu_time_qos_stats;

	/* Statistics accumulated for terminated threads from this task */
	uint32_t	task_timer_wakeups_bin_1;
	uint32_t	task_timer_wakeups_bin_2;
	uint64_t	task_gpu_ns;
	uint64_t	task_energy;

	/* # of purgeable volatile VM objects owned by this task: */
	int		task_volatile_objects;
	/* # of purgeable but not volatile VM objects owned by this task: */
	int		task_nonvolatile_objects;
	boolean_t	task_purgeable_disowning;
	boolean_t	task_purgeable_disowned;

	/*
	 * A task's coalition set is "adopted" in task_create_internal
	 * and unset in task_deallocate_internal, so each array member
	 * can be referenced without the task lock.
	 * Note: these fields are protected by coalition->lock,
	 *       not the task lock.
	 */
	coalition_t	coalition[COALITION_NUM_TYPES];
	queue_chain_t   task_coalition[COALITION_NUM_TYPES];
	uint64_t        dispatchqueue_offset;

#if DEVELOPMENT || DEBUG
	boolean_t	task_unnested;
	int		task_disconnected_count;
#endif

#if HYPERVISOR
	void *hv_task_target; /* hypervisor virtual machine object associated with this task */
#endif /* HYPERVISOR */

#if CONFIG_SECLUDED_MEMORY
	boolean_t	task_can_use_secluded_mem;
	boolean_t	task_could_use_secluded_mem;
	boolean_t	task_could_also_use_secluded_mem;
#endif /* CONFIG_SECLUDED_MEMORY */

	queue_head_t    io_user_clients;
	uint32_t	exec_token;
};

#define task_lock(task)		 	lck_mtx_lock(&(task)->lock)
#define	task_lock_assert_owned(task)	lck_mtx_assert(&(task)->lock, LCK_MTX_ASSERT_OWNED)
#define task_lock_try(task)	 	lck_mtx_try_lock(&(task)->lock)
#define task_unlock(task)	 	lck_mtx_unlock(&(task)->lock)

#define	itk_lock_init(task)	lck_mtx_init(&(task)->itk_lock_data, &ipc_lck_grp, &ipc_lck_attr)
#define	itk_lock_destroy(task)	lck_mtx_destroy(&(task)->itk_lock_data, &ipc_lck_grp)
#define	itk_lock(task)		lck_mtx_lock(&(task)->itk_lock_data)
#define	itk_unlock(task)	lck_mtx_unlock(&(task)->itk_lock_data)

#define TASK_REFERENCE_LEAK_DEBUG 0

#if TASK_REFERENCE_LEAK_DEBUG
extern void task_reference_internal(task_t task);
extern uint32_t task_deallocate_internal(task_t task);
#else
#define task_reference_internal(task)		\
			(void)hw_atomic_add(&(task)->ref_count, 1)

#define task_deallocate_internal(task)		\
			hw_atomic_sub(&(task)->ref_count, 1)
#endif

#define task_reference(task)					\
MACRO_BEGIN										\
	if ((task) != TASK_NULL)					\
		task_reference_internal(task);			\
MACRO_END

extern kern_return_t	kernel_task_create(
							task_t			task,
							vm_offset_t		map_base,
							vm_size_t		map_size,
							task_t 			*child);

/* Initialize task module */
extern void		task_init(void);

/* coalition_init() calls this to initialize ledgers before task_init() */
extern void		init_task_ledgers(void);

#define	current_task_fast()	(current_thread()->task)
#define current_task()		current_task_fast()

extern lck_attr_t      task_lck_attr;
extern lck_grp_t       task_lck_grp;


#else	/* MACH_KERNEL_PRIVATE */

__BEGIN_DECLS

extern task_t	current_task(void);

extern void		task_reference(task_t	task);

#define TF_NONE                 0
#define TF_LRETURNWAIT          0x00000100                              /* task is waiting for fork/posix_spawn/exec to complete */
#define TF_LRETURNWAITER        0x00000200                              /* task is waiting for TF_LRETURNWAIT to get cleared */

#define TPF_NONE                0
#define TPF_EXEC_COPY           0x00000002                              /* task is the new copy of an exec */


__END_DECLS

#endif	/* MACH_KERNEL_PRIVATE */

__BEGIN_DECLS

#ifdef	XNU_KERNEL_PRIVATE

/* Hold all threads in a task */
extern kern_return_t	task_hold(
							task_t		task);

/* Wait for task to stop running, either just to get off CPU or to cease being runnable */
extern kern_return_t	task_wait(
							task_t		task,
							boolean_t 	until_not_runnable);

/* Release hold on all threads in a task */
extern kern_return_t	task_release(
							task_t		task);

/* Suspend/resume a task where the kernel owns the suspend count */
extern kern_return_t    task_suspend_internal(          task_t          task);
extern kern_return_t    task_resume_internal(           task_t          task);

/* Suspends a task by placing a hold on its threads */
extern kern_return_t    task_pidsuspend(
							task_t		task);
extern kern_return_t    task_pidsuspend_locked(
							task_t		task);

/* Resumes a previously paused task */
extern kern_return_t    task_pidresume(
							task_t		task);

extern kern_return_t	task_send_trace_memory(
							task_t		task,
							uint32_t	pid,
							uint64_t	uniqueid);

#if DEVELOPMENT || DEBUG

extern kern_return_t	task_disconnect_page_mappings(
	                                                task_t		task);
#endif

extern void 			tasks_system_suspend(boolean_t suspend);

#if CONFIG_FREEZE

/* Freeze a task's resident pages */
extern kern_return_t	task_freeze(
							task_t		task,
							uint32_t	*purgeable_count,
							uint32_t	*wired_count,
							uint32_t	*clean_count,
							uint32_t	*dirty_count,
							uint32_t	dirty_budget,
							boolean_t	*shared,
							boolean_t	walk_only);

/* Thaw a currently frozen task */
extern kern_return_t	task_thaw(
							task_t		task);

#endif /* CONFIG_FREEZE */

/* Halt all other threads in the current task */
extern kern_return_t	task_start_halt(
							task_t		task);

/* Wait for other threads to halt and free halting task resources */
extern void		task_complete_halt(
							task_t		task);

extern kern_return_t	task_terminate_internal(
							task_t			task);

extern kern_return_t	task_create_internal(
							task_t		parent_task,
							coalition_t	*parent_coalitions,
							boolean_t	inherit_memory,
							boolean_t	is_64bit,
							uint32_t	flags,
							uint32_t	procflags,
							task_t		*child_task);	/* OUT */


extern void 		task_power_info_locked(
							task_t			task,
							task_power_info_t	info,
							gpu_energy_data_t gpu_energy,
							uint64_t *task_power);

extern uint64_t		task_gpu_utilisation(
							task_t	 task);

extern uint64_t		task_energy(
							task_t	 task);

extern void		task_vtimer_set(
					task_t		task,
					integer_t	which);

extern void		task_vtimer_clear(
					task_t		task,
					integer_t	which);

extern void		task_vtimer_update(
					task_t		task,
					integer_t	which,
					uint32_t	*microsecs);

#define	TASK_VTIMER_USER		0x01
#define	TASK_VTIMER_PROF		0x02
#define	TASK_VTIMER_RLIM		0x04

extern void		task_set_64bit(
					task_t		task,
					boolean_t	is64bit);

extern void		task_backing_store_privileged(
					task_t		task);

extern void		task_set_dyld_info(
    					task_t		task,
					mach_vm_address_t addr,
					mach_vm_size_t size);

/* Get number of activations in a task */
extern int		get_task_numacts(
					task_t		task);

extern int get_task_numactivethreads(task_t task);
extern kern_return_t task_collect_crash_info(task_t task, struct proc *p, int is_corpse_fork);
void task_port_notify(mach_msg_header_t *msg);
void task_wait_till_threads_terminate_locked(task_t task);

/* JMM - should just be temporary (implementation in bsd_kern still) */
extern void	set_bsdtask_info(task_t,void *);
extern vm_map_t get_task_map_reference(task_t);
extern vm_map_t	swap_task_map(task_t, thread_t, vm_map_t, boolean_t);
extern pmap_t	get_task_pmap(task_t);
extern uint64_t	get_task_resident_size(task_t);
extern uint64_t	get_task_compressed(task_t);
extern uint64_t	get_task_resident_max(task_t);
extern uint64_t	get_task_phys_footprint(task_t);
extern uint64_t	get_task_phys_footprint_max(task_t);
extern uint64_t	get_task_phys_footprint_limit(task_t);
extern uint64_t	get_task_purgeable_size(task_t);
extern uint64_t	get_task_cpu_time(task_t);
extern uint64_t get_task_dispatchqueue_offset(task_t);
extern uint64_t get_task_dispatchqueue_serialno_offset(task_t);
extern uint64_t get_task_uniqueid(task_t);

extern uint64_t get_task_internal(task_t);
extern uint64_t get_task_internal_compressed(task_t);
extern uint64_t get_task_purgeable_nonvolatile(task_t);
extern uint64_t get_task_purgeable_nonvolatile_compressed(task_t);
extern uint64_t get_task_iokit_mapped(task_t);
extern uint64_t get_task_alternate_accounting(task_t);
extern uint64_t get_task_alternate_accounting_compressed(task_t);
extern uint64_t get_task_memory_region_count(task_t);
extern uint64_t get_task_page_table(task_t);

extern kern_return_t task_convert_phys_footprint_limit(int, int *);
extern kern_return_t task_set_phys_footprint_limit_internal(task_t, int, int *, boolean_t);
extern kern_return_t task_get_phys_footprint_limit(task_t task, int *limit_mb);

extern boolean_t	is_kerneltask(task_t task);
extern boolean_t	is_corpsetask(task_t task);

extern kern_return_t check_actforsig(task_t task, thread_t thread, int setast);

extern kern_return_t machine_task_get_state(
					task_t task, 
					int flavor, 
					thread_state_t state, 
					mach_msg_type_number_t *state_count);

extern kern_return_t machine_task_set_state(
					task_t task, 
					int flavor, 
					thread_state_t state, 
					mach_msg_type_number_t state_count);

extern void machine_task_terminate(task_t task);

struct _task_ledger_indices {
	int cpu_time;
	int tkm_private;
	int tkm_shared;
	int phys_mem;
	int wired_mem;
	int internal;
	int iokit_mapped;
	int alternate_accounting;
	int alternate_accounting_compressed;
	int page_table;
	int phys_footprint;
	int internal_compressed;
	int purgeable_volatile;
	int purgeable_nonvolatile;
	int purgeable_volatile_compressed;
	int purgeable_nonvolatile_compressed;
	int platform_idle_wakeups;
	int interrupt_wakeups;
#if CONFIG_SCHED_SFI
	int sfi_wait_times[MAX_SFI_CLASS_ID];
#endif /* CONFIG_SCHED_SFI */
#ifdef CONFIG_BANK
	int cpu_time_billed_to_me;
	int cpu_time_billed_to_others;
#endif
	int physical_writes;
	int logical_writes;
};
extern struct _task_ledger_indices task_ledgers;

/* requires task to be unlocked, returns a referenced thread */
thread_t task_findtid(task_t task, uint64_t tid);

extern kern_return_t task_wakeups_monitor_ctl(task_t task, uint32_t *rate_hz, int32_t *flags);
extern kern_return_t task_cpu_usage_monitor_ctl(task_t task, uint32_t *flags);
extern void task_rollup_accounting_info(task_t new_task, task_t parent_task);
extern kern_return_t task_io_monitor_ctl(task_t task, uint32_t *flags);
extern void task_set_did_exec_flag(task_t task);
extern void task_clear_exec_copy_flag(task_t task);
extern boolean_t task_is_exec_copy(task_t);
extern boolean_t task_did_exec(task_t task);
extern boolean_t task_is_active(task_t task);
extern void task_clear_return_wait(task_t task);
extern void task_wait_to_return(void);
extern event_t task_get_return_wait_event(task_t task);

extern void task_atm_reset(task_t task);
extern void task_bank_reset(task_t task);
extern void task_bank_init(task_t task);

extern int task_pid(task_t task);
extern boolean_t task_has_assertions(task_t task);
/* End task_policy */

extern void      task_set_gpu_denied(task_t task, boolean_t denied);
extern boolean_t task_is_gpu_denied(task_t task);

extern queue_head_t * task_io_user_clients(task_t task);

#endif	/* XNU_KERNEL_PRIVATE */

#ifdef	KERNEL_PRIVATE

extern void 	*get_bsdtask_info(task_t);
extern void	*get_bsdthreadtask_info(thread_t);
extern void task_bsdtask_kill(task_t);
extern vm_map_t get_task_map(task_t);
extern ledger_t	get_task_ledger(task_t);

extern boolean_t get_task_pidsuspended(task_t);
extern boolean_t get_task_frozen(task_t);

/* Convert from a task to a port */
extern ipc_port_t convert_task_to_port(task_t);
extern ipc_port_t convert_task_name_to_port(task_name_t);
extern ipc_port_t convert_task_suspension_token_to_port(task_suspension_token_t task);

/* Convert from a port (in this case, an SO right to a task's resume port) to a task. */
extern task_suspension_token_t convert_port_to_task_suspension_token(ipc_port_t port);

extern boolean_t task_suspension_notify(mach_msg_header_t *);

#define TASK_WRITE_IMMEDIATE 		0x1
#define TASK_WRITE_DEFERRED 		0x2
#define TASK_WRITE_INVALIDATED		0x4
#define TASK_WRITE_METADATA 		0x8
extern void 	task_update_logical_writes(task_t task, uint32_t io_size, int flags, void *vp);

#if CONFIG_SECLUDED_MEMORY
extern void task_set_can_use_secluded_mem(
	task_t task,
	boolean_t can_use_secluded_mem);
extern void task_set_could_use_secluded_mem(
	task_t task,
	boolean_t could_use_secluded_mem);
extern void task_set_could_also_use_secluded_mem(
	task_t task,
	boolean_t could_also_use_secluded_mem);
extern boolean_t task_can_use_secluded_mem(task_t task);
extern boolean_t task_could_use_secluded_mem(task_t task);
#endif /* CONFIG_SECLUDED_MEMORY */

#if CONFIG_MACF
extern struct label *get_task_crash_label(task_t task);
extern void set_task_crash_label(task_t task, struct label *label);
#endif /* CONFIG_MACF */

#endif	/* KERNEL_PRIVATE */

extern task_t	kernel_task;

extern void		task_deallocate(
					task_t		task);

extern void		task_name_deallocate(
					task_name_t		task_name);

extern void		task_suspension_token_deallocate(
					task_suspension_token_t	token);
__END_DECLS

#endif	/* _KERN_TASK_H_ */