osfmk/kern/task.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
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  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_FREE_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53 /*
  54  */
  55 /*
  56  *      File:   task.h
  57  *      Author: Avadis Tevanian, Jr.
  58  *
  59  *      This file contains the structure definitions for tasks.
  60  *
  61  */
  62 /*
  63  * Copyright (c) 1993 The University of Utah and
  64  * the Computer Systems Laboratory (CSL).  All rights reserved.
  65  *
  66  * Permission to use, copy, modify and distribute this software and its
  67  * documentation is hereby granted, provided that both the copyright
  68  * notice and this permission notice appear in all copies of the
  69  * software, derivative works or modified versions, and any portions
  70  * thereof, and that both notices appear in supporting documentation.
  71  *
  72  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
  73  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
  74  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  75  *
  76  * CSL requests users of this software to return to csl-dist@cs.utah.edu any
  77  * improvements that they make and grant CSL redistribution rights.
  78  *
  79  */
  80
  81 #ifndef _KERN_TASK_H_
  82 #define _KERN_TASK_H_
  83
  84 #include <kern/kern_types.h>
  85 #include <mach/mach_types.h>
  86 #include <vm/pmap.h>
  87
  88 #ifdef  __APPLE_API_PRIVATE
  89
  90 #ifdef  MACH_KERNEL_PRIVATE
  91
  92 #include <mach/boolean.h>
  93 #include <mach/port.h>
  94 #include <mach/time_value.h>
  95 #include <mach/message.h>
  96 #include <mach/mach_param.h>
  97 #include <mach/task_info.h>
  98 #include <mach/exception_types.h>
  99 #include <mach_prof.h>
 100 #include <machine/task.h>
 101 #include <kern/queue.h>
 102 #include <kern/exception.h>
 103 #include <kern/lock.h>
 104 #include <kern/syscall_emulation.h>
 105 #include <norma_task.h>
 106 #include <mach_host.h>
 107 #include <fast_tas.h>
 108 #include <task_swapper.h>
 109 #include <kern/thread_act.h>
 110
 111 typedef struct task {
 112         /* Synchronization/destruction information */
 113         decl_mutex_data(,lock)          /* Task's lock */
 114         int             ref_count;      /* Number of references to me */
 115         boolean_t       active;         /* Task has not been terminated */
 116         boolean_t       kernel_loaded;  /* Created with kernel_task_create() */
 117
 118         /* Miscellaneous */
 119         vm_map_t        map;            /* Address space description */
 120         queue_chain_t   pset_tasks;     /* list of tasks assigned to pset */
 121         void            *user_data;     /* Arbitrary data settable via IPC */
 122         int             suspend_count;  /* Internal scheduling only */
 123
 124 #if     TASK_SWAPPER
 125         /* Task swapper data */
 126         unsigned short  swap_state;     /* swap state (e.g. IN/OUT) */
 127         unsigned short  swap_flags;     /* swap flags (e.g. MAKE_UNSWAPP) */
 128         unsigned int    swap_stamp;     /* when last swapped */
 129         unsigned long   swap_rss;       /* size (pages) when last swapped */
 130         int             swap_ast_waiting; /* number of threads that have not */
 131                                           /* reached a clean point and halted */
 132         int             swap_nswap;     /* number of times this task swapped */
 133         queue_chain_t   swapped_tasks;  /* list of non-resident tasks */
 134 #endif  /* TASK_SWAPPER */
 135
 136         /* Activations in this task */
 137         queue_head_t    thr_acts;       /* list of thread_activations */
 138         int             thr_act_count;
 139         int             res_act_count;
 140         int             active_act_count; /* have not terminate_self yet */
 141
 142         processor_set_t processor_set;  /* processor set for new threads */
 143 #if     MACH_HOST
 144         boolean_t       may_assign;     /* can assigned pset be changed? */
 145         boolean_t       assign_active;  /* waiting for may_assign */
 146 #endif  /* MACH_HOST */
 147
 148         /* User-visible scheduling information */
 149         integer_t               user_stop_count;        /* outstanding stops */
 150
 151         task_role_t             role;
 152
 153         integer_t               priority;                       /* base priority for threads */
 154         integer_t               max_priority;           /* maximum priority for threads */
 155
 156         /* Task security token */
 157         security_token_t sec_token;
 158
 159         /* Statistics */
 160         time_value_t    total_user_time;        /* user time for dead threads */
 161         time_value_t    total_system_time;      /* system time for dead threads */
 162
 163 #if     MACH_PROF
 164         boolean_t       task_profiled;  /* is task being profiled ? */
 165         struct prof_data *profil_buffer;/* profile struct if so */
 166 #endif  /* MACH_PROF */
 167
 168         /* IPC structures */
 169         decl_mutex_data(,itk_lock_data)
 170         struct ipc_port *itk_self;      /* not a right, doesn't hold ref */
 171         struct ipc_port *itk_sself;     /* a send right */
 172         struct exception_action exc_actions[EXC_TYPES_COUNT];
 173                                         /* a send right each valid element  */
 174         struct ipc_port *itk_host;      /* a send right */
 175         struct ipc_port *itk_bootstrap; /* a send right */
 176         struct ipc_port *itk_registered[TASK_PORT_REGISTER_MAX];
 177                                         /* all send rights */
 178
 179         struct ipc_space *itk_space;
 180
 181         /* Synchronizer ownership information */
 182         queue_head_t    semaphore_list;         /* list of owned semaphores   */
 183         queue_head_t    lock_set_list;          /* list of owned lock sets    */
 184         int             semaphores_owned;       /* number of semaphores owned */
 185         int             lock_sets_owned;        /* number of lock sets owned  */
 186
 187         /* User space system call emulation support */
 188         struct  eml_dispatch    *eml_dispatch;
 189
 190         /* Ledgers */
 191         struct ipc_port *wired_ledger_port;
 192         struct ipc_port *paged_ledger_port;
 193
 194 #if     NORMA_TASK
 195         long            child_node;     /* if != -1, node for new children */
 196 #endif  /* NORMA_TASK */
 197 #if     FAST_TAS
 198         vm_offset_t     fast_tas_base;
 199         vm_offset_t     fast_tas_end;
 200 #endif  /* FAST_TAS */
 201         MACHINE_TASK
 202         integer_t faults;              /* faults counter */
 203         integer_t pageins;             /* pageins counter */
 204         integer_t cow_faults;          /* copy on write fault counter */
 205         integer_t messages_sent;       /* messages sent counter */
 206         integer_t messages_received;   /* messages received counter */
 207         integer_t syscalls_mach;       /* mach system call counter */
 208         integer_t syscalls_unix;       /* unix system call counter */
 209         integer_t csw;                 /* context switch counter */
 210 #ifdef  MACH_BSD
 211         void *bsd_info;
 212 #endif
 213         vm_offset_t     system_shared_region;
 214         vm_offset_t     dynamic_working_set;
 215 } Task;
 216
 217 #define task_lock(task)         mutex_lock(&(task)->lock)
 218 #define task_lock_try(task)     mutex_try(&(task)->lock)
 219 #define task_unlock(task)       mutex_unlock(&(task)->lock)
 220
 221 #define itk_lock_init(task)     mutex_init(&(task)->itk_lock_data, \
 222                                            ETAP_THREAD_TASK_ITK)
 223 #define itk_lock(task)          mutex_lock(&(task)->itk_lock_data)
 224 #define itk_unlock(task)        mutex_unlock(&(task)->itk_lock_data)
 225
 226 #define task_reference_locked(task) ((task)->ref_count++)
 227
 228 /*
 229  *      Internal only routines
 230  */
 231
 232 /* Initialize task module */
 233 extern void             task_init(void);
 234
 235 /* task create */
 236 extern kern_return_t    task_create_local(
 237                                 task_t          parent_task,
 238                                 boolean_t       inherit_memory,
 239                                 boolean_t       kernel_loaded,
 240                                 task_t          *child_task);   /* OUT */
 241
 242 extern void             consider_task_collect(void);
 243
 244 #define current_task_fast()     (current_act_fast()->task)
 245 #define current_task()          current_task_fast()
 246
 247 #endif  /* MACH_KERNEL_PRIVATE */
 248
 249 extern task_t           kernel_task;
 250
 251 /* Temporarily hold all threads in a task */
 252 extern kern_return_t    task_hold(
 253                                 task_t  task);
 254
 255 /* Release temporary hold on all threads in a task */
 256 extern kern_return_t    task_release(
 257                                 task_t  task);
 258
 259 /* Get a task prepared for major changes */
 260 extern kern_return_t    task_halt(
 261                                 task_t  task);
 262
 263 #if defined(MACH_KERNEL_PRIVATE) || defined(BSD_BUILD)
 264 extern kern_return_t    task_importance(
 265                                                         task_t                  task,
 266                                                         integer_t               importance);
 267 #endif
 268
 269 /* JMM - should just be temporary (implementation in bsd_kern still) */
 270 extern void     *get_bsdtask_info(task_t);
 271 extern void     set_bsdtask_info(task_t,void *);
 272 extern vm_map_t get_task_map(task_t);
 273 extern vm_map_t swap_task_map(task_t, vm_map_t);
 274 extern pmap_t   get_task_pmap(task_t);
 275
 276 extern boolean_t        task_reference_try(task_t task);
 277
 278 #endif  /* __APPLE_API_PRIVATE */
 279
 280 #if             !defined(MACH_KERNEL_PRIVATE)
 281
 282 extern task_t   current_task(void);
 283
 284 #endif  /* MACH_KERNEL_TASK */
 285
 286 /* Take reference on task (make sure it doesn't go away) */
 287 extern void             task_reference(task_t   task);
 288
 289 /* Remove reference to task */
 290 extern void             task_deallocate(task_t  task);
 291
 292 #endif  /* _KERN_TASK_H_ */