osfmk/kern/task.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_FREE_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52 /*
  53  *      File:   task.h
  54  *      Author: Avadis Tevanian, Jr.
  55  *
  56  *      This file contains the structure definitions for tasks.
  57  *
  58  */
  59 /*
  60  * Copyright (c) 1993 The University of Utah and
  61  * the Computer Systems Laboratory (CSL).  All rights reserved.
  62  *
  63  * Permission to use, copy, modify and distribute this software and its
  64  * documentation is hereby granted, provided that both the copyright
  65  * notice and this permission notice appear in all copies of the
  66  * software, derivative works or modified versions, and any portions
  67  * thereof, and that both notices appear in supporting documentation.
  68  *
  69  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
  70  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
  71  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  72  *
  73  * CSL requests users of this software to return to csl-dist@cs.utah.edu any
  74  * improvements that they make and grant CSL redistribution rights.
  75  *
  76  */
  77
  78 #ifndef _KERN_TASK_H_
  79 #define _KERN_TASK_H_
  80
  81 #include <kern/kern_types.h>
  82 #include <mach/mach_types.h>
  83 #include <vm/pmap.h>
  84
  85 #ifdef MACH_KERNEL_PRIVATE
  86 #include <mach/boolean.h>
  87 #include <mach/port.h>
  88 #include <mach/time_value.h>
  89 #include <mach/message.h>
  90 #include <mach/mach_param.h>
  91 #include <mach/task_info.h>
  92 #include <mach/exception_types.h>
  93 #include <mach_prof.h>
  94 #include <machine/task.h>
  95 #include <kern/queue.h>
  96 #include <kern/exception.h>
  97 #include <kern/lock.h>
  98 #include <kern/syscall_emulation.h>
  99 #include <norma_task.h>
 100 #include <mach_host.h>
 101 #include <fast_tas.h>
 102 #include <task_swapper.h>
 103 #include <kern/thread_act.h>
 104
 105 typedef struct task {
 106         /* Synchronization/destruction information */
 107         decl_mutex_data(,lock)          /* Task's lock */
 108         int             ref_count;      /* Number of references to me */
 109         boolean_t       active;         /* Task has not been terminated */
 110         boolean_t       kernel_loaded;  /* Created with kernel_task_create() */
 111
 112         /* Miscellaneous */
 113         vm_map_t        map;            /* Address space description */
 114         queue_chain_t   pset_tasks;     /* list of tasks assigned to pset */
 115         void            *user_data;     /* Arbitrary data settable via IPC */
 116         int             suspend_count;  /* Internal scheduling only */
 117
 118 #if     TASK_SWAPPER
 119         /* Task swapper data */
 120         unsigned short  swap_state;     /* swap state (e.g. IN/OUT) */
 121         unsigned short  swap_flags;     /* swap flags (e.g. MAKE_UNSWAPP) */
 122         unsigned int    swap_stamp;     /* when last swapped */
 123         unsigned long   swap_rss;       /* size (pages) when last swapped */
 124         int             swap_ast_waiting; /* number of threads that have not */
 125                                           /* reached a clean point and halted */
 126         int             swap_nswap;     /* number of times this task swapped */
 127         queue_chain_t   swapped_tasks;  /* list of non-resident tasks */
 128 #endif  /* TASK_SWAPPER */
 129
 130         /* Activations in this task */
 131         queue_head_t    thr_acts;       /* list of thread_activations */
 132         int             thr_act_count;
 133         int             res_act_count;
 134         int             active_act_count; /* have not terminate_self yet */
 135
 136         processor_set_t processor_set;  /* processor set for new threads */
 137 #if     MACH_HOST
 138         boolean_t       may_assign;     /* can assigned pset be changed? */
 139         boolean_t       assign_active;  /* waiting for may_assign */
 140 #endif  /* MACH_HOST */
 141
 142         /* User-visible scheduling information */
 143         integer_t               user_stop_count;        /* outstanding stops */
 144
 145         integer_t               importance;             /* system-wide importance */
 146
 147         integer_t               priority;               /* base priority */
 148         integer_t               max_priority;   /* maximum priority */
 149
 150         integer_t               policy;                 /* obsolete */
 151
 152         /* Task security token */
 153         security_token_t sec_token;
 154
 155         /* Statistics */
 156         time_value_t    total_user_time;        /* user time for dead threads */
 157         time_value_t    total_system_time;      /* system time for dead threads */
 158
 159 #if     MACH_PROF
 160         boolean_t       task_profiled;  /* is task being profiled ? */
 161         struct prof_data *profil_buffer;/* profile struct if so */
 162 #endif  /* MACH_PROF */
 163
 164         /* IPC structures */
 165         decl_mutex_data(,itk_lock_data)
 166         struct ipc_port *itk_self;      /* not a right, doesn't hold ref */
 167         struct ipc_port *itk_sself;     /* a send right */
 168         struct exception_action exc_actions[EXC_TYPES_COUNT];
 169                                         /* a send right each valid element  */
 170         struct ipc_port *itk_host;      /* a send right */
 171         struct ipc_port *itk_bootstrap; /* a send right */
 172         struct ipc_port *itk_registered[TASK_PORT_REGISTER_MAX];
 173                                         /* all send rights */
 174
 175         struct ipc_space *itk_space;
 176
 177         /* RPC subsystem information */
 178         queue_head_t    subsystem_list; /* list of subsystems */
 179         int             subsystem_count;/* number of subsystems */
 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 } Task;
 215
 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 /*
 227  *      Internal only routines
 228  */
 229
 230 /* Initialize task module */
 231 extern void             task_init(void);
 232
 233 /* task create */
 234 extern kern_return_t    task_create_local(
 235                                 task_t          parent_task,
 236                                 boolean_t       inherit_memory,
 237                                 boolean_t       kernel_loaded,
 238                                 task_t          *child_task);   /* OUT */
 239
 240 #if     MACH_HOST
 241 /* Freeze and unfreeze task from being reassigned processor sets */
 242 extern void             task_freeze(
 243                                 task_t          task);
 244
 245 extern void             task_unfreeze(
 246                                 task_t          task);
 247 #endif  /* MACH_HOST */
 248
 249 extern void             consider_task_collect(void);
 250
 251 #define current_task_fast()     (current_act_fast()->task)
 252 #define current_task()          current_task_fast()
 253
 254 #else /* !MACH_KERNEL_PRIVATE */
 255
 256 extern task_t current_task(void);
 257
 258 #endif /* !MACH_KERNEL_PRIVATE */
 259
 260 extern task_t           kernel_task;
 261 extern boolean_t        is_kerneltask(task_t);
 262
 263 /* Temporarily hold all threads in a task */
 264 extern kern_return_t    task_hold(
 265                                 task_t  task);
 266
 267 /* Release temporary hold on all threads in a task */
 268 extern kern_return_t    task_release(
 269                                 task_t  task);
 270
 271 /* Get a task prepared for major changes */
 272 extern kern_return_t    task_halt(
 273                                 task_t  task);
 274
 275 /* Take reference on task (make sure it doesn't go away) */
 276 extern void             task_reference(task_t   task);
 277
 278 /* Try to take a reference on task, return false if it would block */
 279 extern boolean_t        task_reference_try(task_t task);
 280
 281 /* Remove reference to task */
 282 extern void             task_deallocate(task_t  task);
 283
 284 /* JMM - should just be temporary (implementation in bsd_kern still) */
 285 extern void     *get_bsdtask_info(task_t);
 286 extern void     set_bsdtask_info(task_t,void *);
 287 extern vm_map_t get_task_map(task_t);
 288 extern vm_map_t swap_task_map(task_t, vm_map_t);
 289 extern pmap_t   get_task_pmap(task_t);
 290 #endif  /* _KERN_TASK_H_ */