The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/proc.h

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    1 /*-
    2  * Copyright (c) 1986, 1989, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)proc.h      8.15 (Berkeley) 5/19/95
   35  * $FreeBSD$
   36  */
   37 
   38 #ifndef _SYS_PROC_H_
   39 #define _SYS_PROC_H_
   40 
   41 #include <sys/callout.h>                /* For struct callout. */
   42 #include <sys/event.h>                  /* For struct klist. */
   43 #include <sys/condvar.h>
   44 #ifndef _KERNEL
   45 #include <sys/filedesc.h>
   46 #endif
   47 #include <sys/queue.h>
   48 #include <sys/_lock.h>
   49 #include <sys/_mutex.h>
   50 #include <sys/osd.h>
   51 #include <sys/priority.h>
   52 #include <sys/rtprio.h>                 /* XXX. */
   53 #include <sys/runq.h>
   54 #include <sys/resource.h>
   55 #include <sys/sigio.h>
   56 #include <sys/signal.h>
   57 #include <sys/signalvar.h>
   58 #ifndef _KERNEL
   59 #include <sys/time.h>                   /* For structs itimerval, timeval. */
   60 #else
   61 #include <sys/pcpu.h>
   62 #endif
   63 #include <sys/ucontext.h>
   64 #include <sys/ucred.h>
   65 #include <machine/proc.h>               /* Machine-dependent proc substruct. */
   66 
   67 /*
   68  * One structure allocated per session.
   69  *
   70  * List of locks
   71  * (m)          locked by s_mtx mtx
   72  * (e)          locked by proctree_lock sx
   73  * (c)          const until freeing
   74  */
   75 struct session {
   76         int             s_count;        /* (m) Ref cnt; pgrps in session. */
   77         struct proc     *s_leader;      /* (m + e) Session leader. */
   78         struct vnode    *s_ttyvp;       /* (m) Vnode of controlling tty. */
   79         struct tty      *s_ttyp;        /* (m) Controlling tty. */
   80         pid_t           s_sid;          /* (c) Session ID. */
   81                                         /* (m) Setlogin() name: */
   82         char            s_login[roundup(MAXLOGNAME, sizeof(long))];
   83         struct mtx      s_mtx;          /* Mutex to protect members. */
   84 };
   85 
   86 /*
   87  * One structure allocated per process group.
   88  *
   89  * List of locks
   90  * (m)          locked by pg_mtx mtx
   91  * (e)          locked by proctree_lock sx
   92  * (c)          const until freeing
   93  */
   94 struct pgrp {
   95         LIST_ENTRY(pgrp) pg_hash;       /* (e) Hash chain. */
   96         LIST_HEAD(, proc) pg_members;   /* (m + e) Pointer to pgrp members. */
   97         struct session  *pg_session;    /* (c) Pointer to session. */
   98         struct sigiolst pg_sigiolst;    /* (m) List of sigio sources. */
   99         pid_t           pg_id;          /* (c) Process group id. */
  100         int             pg_jobc;        /* (m) Job control process count. */
  101         struct mtx      pg_mtx;         /* Mutex to protect members */
  102 };
  103 
  104 /*
  105  * pargs, used to hold a copy of the command line, if it had a sane length.
  106  */
  107 struct pargs {
  108         u_int   ar_ref;         /* Reference count. */
  109         u_int   ar_length;      /* Length. */
  110         u_char  ar_args[1];     /* Arguments. */
  111 };
  112 
  113 /*-
  114  * Description of a process.
  115  *
  116  * This structure contains the information needed to manage a thread of
  117  * control, known in UN*X as a process; it has references to substructures
  118  * containing descriptions of things that the process uses, but may share
  119  * with related processes.  The process structure and the substructures
  120  * are always addressable except for those marked "(CPU)" below,
  121  * which might be addressable only on a processor on which the process
  122  * is running.
  123  *
  124  * Below is a key of locks used to protect each member of struct proc.  The
  125  * lock is indicated by a reference to a specific character in parens in the
  126  * associated comment.
  127  *      * - not yet protected
  128  *      a - only touched by curproc or parent during fork/wait
  129  *      b - created at fork, never changes
  130  *              (exception aiods switch vmspaces, but they are also
  131  *              marked 'P_SYSTEM' so hopefully it will be left alone)
  132  *      c - locked by proc mtx
  133  *      d - locked by allproc_lock lock
  134  *      e - locked by proctree_lock lock
  135  *      f - session mtx
  136  *      g - process group mtx
  137  *      h - callout_lock mtx
  138  *      i - by curproc or the master session mtx
  139  *      j - locked by proc slock
  140  *      k - only accessed by curthread
  141  *      k*- only accessed by curthread and from an interrupt
  142  *      l - the attaching proc or attaching proc parent
  143  *      m - Giant
  144  *      n - not locked, lazy
  145  *      o - ktrace lock
  146  *      p - select lock (sellock)
  147  *      q - td_contested lock
  148  *      r - p_peers lock
  149  *      t - thread lock
  150  *      x - created at fork, only changes during single threading in exec
  151  *      z - zombie threads lock
  152  *
  153  * If the locking key specifies two identifiers (for example, p_pptr) then
  154  * either lock is sufficient for read access, but both locks must be held
  155  * for write access.
  156  */
  157 struct kaudit_record;
  158 struct td_sched;
  159 struct nlminfo;
  160 struct kaioinfo;
  161 struct p_sched;
  162 struct proc;
  163 struct sleepqueue;
  164 struct thread;
  165 struct trapframe;
  166 struct turnstile;
  167 struct mqueue_notifier;
  168 struct cpuset;
  169 struct kdtrace_proc;
  170 struct kdtrace_thread;
  171 
  172 /*
  173  * Here we define the two structures used for process information.
  174  *
  175  * The first is the thread. It might be thought of as a "Kernel
  176  * Schedulable Entity Context".
  177  * This structure contains all the information as to where a thread of
  178  * execution is now, or was when it was suspended, why it was suspended,
  179  * and anything else that will be needed to restart it when it is
  180  * rescheduled. It includes a scheduler specific substructure that is different
  181  * for each scheduler.
  182  *
  183  * M:N notes.
  184  * It is important to remember that when using M:N threading, 
  185  * a particular thread structure may only exist as long as
  186  * the system call or kernel entrance (e.g. by pagefault)
  187  * which it is currently executing. It should therefore NEVER be referenced
  188  * by pointers in long lived structures that live longer than a single
  189  * request. If several threads complete their work at the same time,
  190  * they will all rewind their stacks to the user boundary, report their
  191  * completion state, and all but one will be freed. That last one will
  192  * be kept to provide a kernel stack and pcb for the NEXT syscall or kernel
  193  * entrance (basically to save freeing and then re-allocating it).  The existing
  194  * thread keeps a cached spare thread available to allow it to quickly
  195  * get one when it needs a new one. There is also a system
  196  * cache of free threads. Threads have priority and partake in priority
  197  * inheritance schemes.
  198  *
  199  * The second is the proc (process) which owns all the resources of a process
  200  * other than CPU cycles, which are parceled out to the threads.
  201  */
  202 
  203 /*
  204  * Kernel runnable context (thread).
  205  * This is what is put to sleep and reactivated.
  206  * Thread context.  Processes may have multiple threads.
  207  */
  208 struct thread {
  209         struct mtx      *volatile td_lock; /* replaces sched lock */
  210         struct proc     *td_proc;       /* (*) Associated process. */
  211         TAILQ_ENTRY(thread) td_plist;   /* (*) All threads in this proc. */
  212 
  213         /* The two queues below should someday be merged. */
  214         TAILQ_ENTRY(thread) td_slpq;    /* (t) Sleep queue. */
  215         TAILQ_ENTRY(thread) td_lockq;   /* (t) Lock queue. */
  216         TAILQ_HEAD(, selinfo) td_selq;  /* (p) List of selinfos. */
  217         struct sleepqueue *td_sleepqueue; /* (k) Associated sleep queue. */
  218         struct turnstile *td_turnstile; /* (k) Associated turnstile. */
  219         struct umtx_q   *td_umtxq;      /* (c?) Link for when we're blocked. */
  220         lwpid_t         td_tid;         /* (b) Thread ID. */
  221         sigqueue_t      td_sigqueue;    /* (c) Sigs arrived, not delivered. */
  222 #define td_siglist      td_sigqueue.sq_signals
  223 
  224 /* Cleared during fork1() or thread_schedule_upcall(). */
  225 #define td_startzero td_flags
  226         int             td_flags;       /* (t) TDF_* flags. */
  227         int             td_inhibitors;  /* (t) Why can not run. */
  228         int             td_pflags;      /* (k) Private thread (TDP_*) flags. */
  229         int             td_dupfd;       /* (k) Ret value from fdopen. XXX */
  230         int             td_sqqueue;     /* (t) Sleepqueue queue blocked on. */
  231         void            *td_wchan;      /* (t) Sleep address. */
  232         const char      *td_wmesg;      /* (t) Reason for sleep. */
  233         u_char          td_lastcpu;     /* (t) Last cpu we were on. */
  234         u_char          td_oncpu;       /* (t) Which cpu we are on. */
  235         volatile u_char td_owepreempt;  /* (k*) Preempt on last critical_exit */
  236         short           td_locks;       /* (k) Count of non-spin locks. */
  237         u_char          td_tsqueue;     /* (t) Turnstile queue blocked on. */
  238         struct turnstile *td_blocked;   /* (t) Lock thread is blocked on. */
  239         const char      *td_lockname;   /* (t) Name of lock blocked on. */
  240         LIST_HEAD(, turnstile) td_contested;    /* (q) Contested locks. */
  241         struct lock_list_entry *td_sleeplocks; /* (k) Held sleep locks. */
  242         int             td_intr_nesting_level; /* (k) Interrupt recursion. */
  243         int             td_pinned;      /* (k) Temporary cpu pin count. */
  244         struct kse_thr_mailbox *td_mailbox; /* (*) Userland mailbox address. */
  245         struct ucred    *td_ucred;      /* (k) Reference to credentials. */
  246         struct thread   *td_standin;    /* (k + a) Use this for an upcall. */
  247         struct kse_upcall *td_upcall;   /* (k + t) Upcall structure. */
  248         u_int           td_estcpu;      /* (t) estimated cpu utilization */
  249         u_int           td_slptick;     /* (t) Time at sleep. */
  250         struct rusage   td_ru;          /* (t) rusage information */
  251         uint64_t        td_runtime;     /* (t) How many cpu ticks we've run. */
  252         u_int           td_pticks;      /* (t) Statclock hits for profiling */
  253         u_int           td_sticks;      /* (t) Statclock hits in system mode. */
  254         u_int           td_iticks;      /* (t) Statclock hits in intr mode. */
  255         u_int           td_uticks;      /* (t) Statclock hits in user mode. */
  256         u_int           td_uuticks;     /* (k) Statclock hits (usr), for UTS. */
  257         u_int           td_usticks;     /* (k) Statclock hits (sys), for UTS. */
  258         int             td_intrval;     /* (t) Return value of TDF_INTERRUPT. */
  259         sigset_t        td_oldsigmask;  /* (k) Saved mask from pre sigpause. */
  260         sigset_t        td_sigmask;     /* (c) Current signal mask. */
  261         volatile u_int  td_generation;  /* (k) For detection of preemption */
  262         stack_t         td_sigstk;      /* (k) Stack ptr and on-stack flag. */
  263         int             td_kflags;      /* (c) Flags for KSE threading. */
  264         int             td_xsig;        /* (c) Signal for ptrace */
  265         u_long          td_profil_addr; /* (k) Temporary addr until AST. */
  266         u_int           td_profil_ticks; /* (k) Temporary ticks until AST. */
  267         char            td_name[MAXCOMLEN + 1]; /* (*) Thread name. */
  268 #define td_endzero td_base_pri
  269 
  270 /* Copied during fork1() or thread_sched_upcall(). */
  271 #define td_startcopy td_endzero
  272         u_char          td_base_pri;    /* (t) Thread base kernel priority. */
  273         u_char          td_priority;    /* (t) Thread active priority. */
  274         u_char          td_pri_class;   /* (t) Scheduling class. */
  275         u_char          td_user_pri;    /* (t) User pri from estcpu and nice. */
  276         u_char          td_base_user_pri; /* (t) Base user pri */
  277 #define td_endcopy td_pcb
  278 
  279 /*
  280  * Fields that must be manually set in fork1() or thread_sched_upcall()
  281  * or already have been set in the allocator, constructor, etc.
  282  */
  283         struct pcb      *td_pcb;        /* (k) Kernel VA of pcb and kstack. */
  284         enum {
  285                 TDS_INACTIVE = 0x0,
  286                 TDS_INHIBITED,
  287                 TDS_CAN_RUN,
  288                 TDS_RUNQ,
  289                 TDS_RUNNING
  290         } td_state;                     /* (t) thread state */
  291         register_t      td_retval[2];   /* (k) Syscall aux returns. */
  292         struct callout  td_slpcallout;  /* (h) Callout for sleep. */
  293         struct trapframe *td_frame;     /* (k) */
  294         struct vm_object *td_kstack_obj;/* (a) Kstack object. */
  295         vm_offset_t     td_kstack;      /* (a) Kernel VA of kstack. */
  296         int             td_kstack_pages; /* (a) Size of the kstack. */
  297         struct vm_object *td_altkstack_obj;/* (a) Alternate kstack object. */
  298         vm_offset_t     td_altkstack;   /* (a) Kernel VA of alternate kstack. */
  299         int             td_altkstack_pages; /* (a) Size of alternate kstack. */
  300         volatile u_int  td_critnest;    /* (k*) Critical section nest level. */
  301         struct mdthread td_md;          /* (k) Any machine-dependent fields. */
  302         struct td_sched *td_sched;      /* (*) Scheduler-specific data. */
  303         struct kaudit_record    *td_ar; /* (k) Active audit record, if any. */
  304         int             td_syscalls;    /* per-thread syscall count (used by NFS :)) */
  305         uint64_t        td_incruntime;  /* (t) Cpu ticks to transfer to proc. */
  306         struct cpuset   *td_cpuset;     /* (t) CPU affinity mask. */
  307         struct file     *td_fpop;       /* (k) file referencing cdev under op */
  308         struct kdtrace_thread   *td_dtrace; /* (*) DTrace-specific data. */
  309         int             td_errno;       /* Error returned by last syscall. */
  310         struct osd      td_osd;         /* (k) Object specific data. */
  311 };
  312 
  313 struct mtx *thread_lock_block(struct thread *);
  314 void thread_lock_unblock(struct thread *, struct mtx *);
  315 void thread_lock_set(struct thread *, struct mtx *);
  316 #define THREAD_LOCK_ASSERT(td, type)                                    \
  317 do {                                                                    \
  318         struct mtx *__m = (td)->td_lock;                                \
  319         if (__m != &blocked_lock)                                       \
  320                 mtx_assert(__m, (type));                                \
  321 } while (0)
  322 
  323 /*
  324  * Flags kept in td_flags:
  325  * To change these you MUST have the scheduler lock.
  326  */
  327 #define TDF_BORROWING   0x00000001 /* Thread is borrowing pri from another. */
  328 #define TDF_INPANIC     0x00000002 /* Caused a panic, let it drive crashdump. */
  329 #define TDF_INMEM       0x00000004 /* Thread's stack is in memory. */
  330 #define TDF_SINTR       0x00000008 /* Sleep is interruptible. */
  331 #define TDF_TIMEOUT     0x00000010 /* Timing out during sleep. */
  332 #define TDF_IDLETD      0x00000020 /* This is a per-CPU idle thread. */
  333 #define TDF_SELECT      0x00000040 /* Selecting; wakeup/waiting danger. */
  334 #define TDF_SLEEPABORT  0x00000080 /* sleepq_abort was called. */
  335 #define TDF_UNUSEDx100  0x00000100 /* --available-- */
  336 #define TDF_UBORROWING  0x00000200 /* Thread is borrowing user pri. */
  337 #define TDF_BOUNDARY    0x00000400 /* Thread suspended at user boundary */
  338 #define TDF_ASTPENDING  0x00000800 /* Thread has some asynchronous events. */
  339 #define TDF_TIMOFAIL    0x00001000 /* Timeout from sleep after we were awake. */
  340 #define TDF_INTERRUPT   0x00002000 /* Thread is marked as interrupted. */
  341 #define TDF_UPIBLOCKED  0x00004000 /* Thread blocked on user PI mutex. */
  342 #define TDF_UNUSED15    0x00008000 /* --available-- */
  343 #define TDF_NEEDRESCHED 0x00010000 /* Thread needs to yield. */
  344 #define TDF_NEEDSIGCHK  0x00020000 /* Thread may need signal delivery. */
  345 #define TDF_XSIG        0x00040000 /* Thread is exchanging signal under trace */
  346 #define TDF_UNUSED19    0x00080000 /* Thread is sleeping on a umtx. */
  347 #define TDF_THRWAKEUP   0x00100000 /* Libthr thread must not suspend itself. */
  348 #define TDF_DBSUSPEND   0x00200000 /* Thread is suspended by debugger */
  349 #define TDF_SWAPINREQ   0x00400000 /* Swapin request due to wakeup. */
  350 #define TDF_UNUSED23    0x00800000 /* --available-- */
  351 #define TDF_SCHED0      0x01000000 /* Reserved for scheduler private use */
  352 #define TDF_SCHED1      0x02000000 /* Reserved for scheduler private use */
  353 #define TDF_SCHED2      0x04000000 /* Reserved for scheduler private use */
  354 #define TDF_SCHED3      0x08000000 /* Reserved for scheduler private use */
  355 #define TDF_ALRMPEND    0x10000000 /* Pending SIGVTALRM needs to be posted. */
  356 #define TDF_PROFPEND    0x20000000 /* Pending SIGPROF needs to be posted. */
  357 #define TDF_MACPEND     0x40000000 /* AST-based MAC event pending. */
  358 
  359 /*
  360  * "Private" flags kept in td_pflags:
  361  * These are only accessed by curthread and thus need no locking.
  362  */
  363 #define TDP_OLDMASK     0x00000001 /* Need to restore mask after suspend. */
  364 #define TDP_INKTR       0x00000002 /* Thread is currently in KTR code. */
  365 #define TDP_INKTRACE    0x00000004 /* Thread is currently in KTRACE code. */
  366 #define TDP_UPCALLING   0x00000008 /* This thread is doing an upcall. */
  367 #define TDP_COWINPROGRESS 0x00000010 /* Snapshot copy-on-write in progress. */
  368 #define TDP_ALTSTACK    0x00000020 /* Have alternate signal stack. */
  369 #define TDP_DEADLKTREAT 0x00000040 /* Lock aquisition - deadlock treatment. */
  370 #define TDP_SA          0x00000080 /* A scheduler activation based thread. */
  371 #define TDP_NOSLEEPING  0x00000100 /* Thread is not allowed to sleep on a sq. */
  372 #define TDP_OWEUPC      0x00000200 /* Call addupc() at next AST. */
  373 #define TDP_ITHREAD     0x00000400 /* Thread is an interrupt thread. */
  374 #define TDP_CAN_UNBIND  0x00000800 /* Only temporarily bound. */
  375 #define TDP_SCHED1      0x00001000 /* Reserved for scheduler private use */
  376 #define TDP_SCHED2      0x00002000 /* Reserved for scheduler private use */
  377 #define TDP_SCHED3      0x00004000 /* Reserved for scheduler private use */
  378 #define TDP_SCHED4      0x00008000 /* Reserved for scheduler private use */
  379 #define TDP_GEOM        0x00010000 /* Settle GEOM before finishing syscall */
  380 #define TDP_SOFTDEP     0x00020000 /* Stuck processing softdep worklist */
  381 #define TDP_NORUNNINGBUF 0x00040000 /* Ignore runningbufspace check */
  382 #define TDP_WAKEUP      0x00080000 /* Don't sleep in umtx cond_wait */
  383 #define TDP_INBDFLUSH   0x00100000 /* Already in BO_BDFLUSH, do not recurse */
  384 #define TDP_CALLCHAIN   0x00400000 /* Capture thread's callchain */
  385 #define TDP_IGNSUSP     0x00800000 /* Permission to ignore the MNTK_SUSPEND* */
  386 #define TDP_AUDITREC    0x01000000 /* Audit record pending on thread */
  387 #define TDP_BUFNEED     0x02000000 /* Do not recurse into the buf flush */
  388 
  389 /*
  390  * Reasons that the current thread can not be run yet.
  391  * More than one may apply.
  392  */
  393 #define TDI_SUSPENDED   0x0001  /* On suspension queue. */
  394 #define TDI_SLEEPING    0x0002  /* Actually asleep! (tricky). */
  395 #define TDI_SWAPPED     0x0004  /* Stack not in mem.  Bad juju if run. */
  396 #define TDI_LOCK        0x0008  /* Stopped on a lock. */
  397 #define TDI_IWAIT       0x0010  /* Awaiting interrupt. */
  398 
  399 /*
  400  * flags (in kflags) related to M:N threading.
  401  */
  402 #define TDK_KSEREL      0x0001  /* Blocked in msleep on p->p_completed. */
  403 #define TDK_KSERELSIG   0x0002  /* Blocked in msleep on p->p_siglist. */
  404 #define TDK_WAKEUP      0x0004  /* Thread has been woken by kse_wakeup. */
  405 
  406 #define TD_CAN_UNBIND(td)                       \
  407     (((td)->td_pflags & TDP_CAN_UNBIND) &&      \
  408      ((td)->td_upcall != NULL))
  409 
  410 #define TD_IS_SLEEPING(td)      ((td)->td_inhibitors & TDI_SLEEPING)
  411 #define TD_ON_SLEEPQ(td)        ((td)->td_wchan != NULL)
  412 #define TD_IS_SUSPENDED(td)     ((td)->td_inhibitors & TDI_SUSPENDED)
  413 #define TD_IS_SWAPPED(td)       ((td)->td_inhibitors & TDI_SWAPPED)
  414 #define TD_ON_LOCK(td)          ((td)->td_inhibitors & TDI_LOCK)
  415 #define TD_AWAITING_INTR(td)    ((td)->td_inhibitors & TDI_IWAIT)
  416 #define TD_IS_RUNNING(td)       ((td)->td_state == TDS_RUNNING)
  417 #define TD_ON_RUNQ(td)          ((td)->td_state == TDS_RUNQ)
  418 #define TD_CAN_RUN(td)          ((td)->td_state == TDS_CAN_RUN)
  419 #define TD_IS_INHIBITED(td)     ((td)->td_state == TDS_INHIBITED)
  420 #define TD_ON_UPILOCK(td)       ((td)->td_flags & TDF_UPIBLOCKED)
  421 #if 0
  422 #define TD_IS_IDLETHREAD(td)    ((td) == pcpu(idlethread))
  423 #else
  424 #define TD_IS_IDLETHREAD(td)    ((td)->td_flags & TDF_IDLETD)
  425 #endif
  426 
  427 
  428 #define TD_SET_INHIB(td, inhib) do {                    \
  429         (td)->td_state = TDS_INHIBITED;                 \
  430         (td)->td_inhibitors |= (inhib);                 \
  431 } while (0)
  432 
  433 #define TD_CLR_INHIB(td, inhib) do {                    \
  434         if (((td)->td_inhibitors & (inhib)) &&          \
  435             (((td)->td_inhibitors &= ~(inhib)) == 0))   \
  436                 (td)->td_state = TDS_CAN_RUN;           \
  437 } while (0)
  438 
  439 #define TD_SET_SLEEPING(td)     TD_SET_INHIB((td), TDI_SLEEPING)
  440 #define TD_SET_SWAPPED(td)      TD_SET_INHIB((td), TDI_SWAPPED)
  441 #define TD_SET_LOCK(td)         TD_SET_INHIB((td), TDI_LOCK)
  442 #define TD_SET_SUSPENDED(td)    TD_SET_INHIB((td), TDI_SUSPENDED)
  443 #define TD_SET_IWAIT(td)        TD_SET_INHIB((td), TDI_IWAIT)
  444 #define TD_SET_EXITING(td)      TD_SET_INHIB((td), TDI_EXITING)
  445 
  446 #define TD_CLR_SLEEPING(td)     TD_CLR_INHIB((td), TDI_SLEEPING)
  447 #define TD_CLR_SWAPPED(td)      TD_CLR_INHIB((td), TDI_SWAPPED)
  448 #define TD_CLR_LOCK(td)         TD_CLR_INHIB((td), TDI_LOCK)
  449 #define TD_CLR_SUSPENDED(td)    TD_CLR_INHIB((td), TDI_SUSPENDED)
  450 #define TD_CLR_IWAIT(td)        TD_CLR_INHIB((td), TDI_IWAIT)
  451 
  452 #define TD_SET_RUNNING(td)      (td)->td_state = TDS_RUNNING
  453 #define TD_SET_RUNQ(td)         (td)->td_state = TDS_RUNQ
  454 #define TD_SET_CAN_RUN(td)      (td)->td_state = TDS_CAN_RUN
  455 
  456 /*
  457  * An upcall is used when returning to userland.  If a thread does not have
  458  * an upcall on return to userland the thread exports its context and exits.
  459  */
  460 struct kse_upcall {
  461         TAILQ_ENTRY(kse_upcall) ku_link;        /* List of upcalls in proc. */
  462         struct proc             *ku_proc;       /* Associated proc. */
  463         struct thread           *ku_owner;      /* Owning thread. */
  464         int                     ku_flags;       /* KUF_* flags. */
  465         struct kse_mailbox      *ku_mailbox;    /* Userland mailbox address. */
  466         stack_t                 ku_stack;       /* Userland upcall stack. */
  467         void                    *ku_func;       /* Userland upcall function. */
  468         unsigned int            ku_mflags;      /* Cached upcall mbox flags. */
  469 };
  470 
  471 #define KUF_DOUPCALL    0x00001         /* Do upcall now; don't wait. */
  472 #define KUF_EXITING     0x00002         /* Upcall structure is exiting. */
  473 
  474 /*
  475  * XXX: Does this belong in resource.h or resourcevar.h instead?
  476  * Resource usage extension.  The times in rusage structs in the kernel are
  477  * never up to date.  The actual times are kept as runtimes and tick counts
  478  * (with control info in the "previous" times), and are converted when
  479  * userland asks for rusage info.  Backwards compatibility prevents putting
  480  * this directly in the user-visible rusage struct.
  481  *
  482  * Locking: (cj) means (j) for p_rux and (c) for p_crux.
  483  */
  484 struct rusage_ext {
  485         u_int64_t       rux_runtime;    /* (cj) Real time. */
  486         u_int64_t       rux_uticks;     /* (cj) Statclock hits in user mode. */
  487         u_int64_t       rux_sticks;     /* (cj) Statclock hits in sys mode. */
  488         u_int64_t       rux_iticks;     /* (cj) Statclock hits in intr mode. */
  489         u_int64_t       rux_uu;         /* (c) Previous user time in usec. */
  490         u_int64_t       rux_su;         /* (c) Previous sys time in usec. */
  491         u_int64_t       rux_tu;         /* (c) Previous total time in usec. */
  492 };
  493 
  494 /*
  495  * The old fashionned process. May have multiple threads.
  496  *  Starts off with a single embedded THREAD.
  497  */
  498 struct proc {
  499         LIST_ENTRY(proc) p_list;        /* (d) List of all processes. */
  500         TAILQ_HEAD(, thread) p_threads; /* (j) all threads. */
  501         TAILQ_HEAD(, kse_upcall) p_upcalls; /* (j) All upcalls in the proc. */
  502         struct mtx      p_slock;        /* process spin lock */
  503         struct ucred    *p_ucred;       /* (c) Process owner's identity. */
  504         struct filedesc *p_fd;          /* (b) Open files. */
  505         struct filedesc_to_leader *p_fdtol; /* (b) Tracking node */
  506                                         /* Accumulated stats for all threads? */
  507         struct pstats   *p_stats;       /* (b) Accounting/statistics (CPU). */
  508         struct plimit   *p_limit;       /* (c) Process limits. */
  509         struct callout  p_limco;        /* (c) Limit callout handle */
  510         struct sigacts  *p_sigacts;     /* (x) Signal actions, state (CPU). */
  511 
  512         /*
  513          * The following don't make too much sense.
  514          * See the td_ or ke_ versions of the same flags.
  515          */
  516         int             p_flag;         /* (c) P_* flags. */
  517         enum {
  518                 PRS_NEW = 0,            /* In creation */
  519                 PRS_NORMAL,             /* threads can be run. */
  520                 PRS_ZOMBIE
  521         } p_state;                      /* (j/c) S* process status. */
  522         pid_t           p_pid;          /* (b) Process identifier. */
  523         LIST_ENTRY(proc) p_hash;        /* (d) Hash chain. */
  524         LIST_ENTRY(proc) p_pglist;      /* (g + e) List of processes in pgrp. */
  525         struct proc     *p_pptr;        /* (c + e) Pointer to parent process. */
  526         LIST_ENTRY(proc) p_sibling;     /* (e) List of sibling processes. */
  527         LIST_HEAD(, proc) p_children;   /* (e) Pointer to list of children. */
  528         struct mtx      p_mtx;          /* (n) Lock for this struct. */
  529         struct ksiginfo *p_ksi; /* Locked by parent proc lock */
  530         sigqueue_t      p_sigqueue;     /* (c) Sigs not delivered to a td. */
  531 #define p_siglist       p_sigqueue.sq_signals
  532 
  533 /* The following fields are all zeroed upon creation in fork. */
  534 #define p_startzero     p_oppid
  535         pid_t           p_oppid;        /* (c + e) Save ppid in ptrace. XXX */
  536         struct vmspace  *p_vmspace;     /* (b) Address space. */
  537         u_int           p_swtick;       /* (j) Tick when swapped in or out. */
  538         struct itimerval p_realtimer;   /* (c) Alarm timer. */
  539         struct rusage   p_ru;           /* (a) Exit information. */
  540         struct rusage_ext p_rux;        /* (cj) Internal resource usage. */
  541         struct rusage_ext p_crux;       /* (c) Internal child resource usage. */
  542         int             p_profthreads;  /* (c) Num threads in addupc_task. */
  543         volatile int    p_exitthreads;  /* (j) Number of threads exiting */
  544         int             p_traceflag;    /* (o) Kernel trace points. */
  545         struct vnode    *p_tracevp;     /* (c + o) Trace to vnode. */
  546         struct ucred    *p_tracecred;   /* (o) Credentials to trace with. */
  547         struct vnode    *p_textvp;      /* (b) Vnode of executable. */
  548         char            p_lock;         /* (c) Proclock (prevent swap) count. */
  549         struct sigiolst p_sigiolst;     /* (c) List of sigio sources. */
  550         int             p_sigparent;    /* (c) Signal to parent on exit. */
  551         int             p_sig;          /* (n) For core dump/debugger XXX. */
  552         u_long          p_code;         /* (n) For core dump/debugger XXX. */
  553         u_int           p_stops;        /* (c) Stop event bitmask. */
  554         u_int           p_stype;        /* (c) Stop event type. */
  555         char            p_step;         /* (c) Process is stopped. */
  556         u_char          p_pfsflags;     /* (c) Procfs flags. */
  557         struct nlminfo  *p_nlminfo;     /* (?) Only used by/for lockd. */
  558         struct kaioinfo *p_aioinfo;     /* (c) ASYNC I/O info. */
  559         struct thread   *p_singlethread;/* (c + j) If single threading this is it */
  560         int             p_suspcount;    /* (j) Num threads in suspended mode. */
  561         struct thread   *p_xthread;     /* (c) Trap thread */
  562         int             p_boundary_count;/* (c) Num threads at user boundary */
  563         int             p_pendingcnt;   /* how many signals are pending */
  564         struct itimers  *p_itimers;     /* (c) POSIX interval timers. */
  565         int             p_numupcalls;   /* (j) Num upcalls. */
  566         int             p_upsleeps;     /* (c) Num threads in kse_release(). */
  567         struct kse_thr_mailbox *p_completed; /* (c) Completed thread mboxes. */
  568         int             p_nextupcall;   /* (n) Next upcall time. */
  569         int             p_upquantum;    /* (n) Quantum to schedule an upcall. */
  570 /* End area that is zeroed on creation. */
  571 #define p_endzero       p_magic
  572 
  573 /* The following fields are all copied upon creation in fork. */
  574 #define p_startcopy     p_endzero
  575         u_int           p_magic;        /* (b) Magic number. */
  576         int             p_osrel;        /* (x) osreldate for the
  577                                                binary (from ELF note, if any) */
  578         char            p_comm[MAXCOMLEN + 1];  /* (b) Process name. */
  579         struct pgrp     *p_pgrp;        /* (c + e) Pointer to process group. */
  580         struct sysentvec *p_sysent;     /* (b) Syscall dispatch info. */
  581         struct pargs    *p_args;        /* (c) Process arguments. */
  582         rlim_t          p_cpulimit;     /* (c) Current CPU limit in seconds. */
  583         signed char     p_nice;         /* (c + j) Process "nice" value. */
  584         int             p_fibnum;       /* in this routing domain XXX MRT */
  585 /* End area that is copied on creation. */
  586 #define p_endcopy       p_xstat
  587 
  588         u_short         p_xstat;        /* (c) Exit status; also stop sig. */
  589         struct knlist   p_klist;        /* (c) Knotes attached to this proc. */
  590         int             p_numthreads;   /* (j) Number of threads. */
  591         struct mdproc   p_md;           /* Any machine-dependent fields. */
  592         struct callout  p_itcallout;    /* (h + c) Interval timer callout. */
  593         u_short         p_acflag;       /* (c) Accounting flags. */
  594         struct proc     *p_peers;       /* (r) */
  595         struct proc     *p_leader;      /* (b) */
  596         void            *p_emuldata;    /* (c) Emulator state data. */
  597         struct label    *p_label;       /* (*) Proc (not subject) MAC label. */
  598         struct p_sched  *p_sched;       /* (*) Scheduler-specific data. */
  599         STAILQ_HEAD(, ktr_request)      p_ktr;  /* (o) KTR event queue. */
  600         LIST_HEAD(, mqueue_notifier)    p_mqnotifier; /* (c) mqueue notifiers.*/
  601         struct kdtrace_proc     *p_dtrace; /* (*) DTrace-specific data. */
  602         struct cv       p_pwait;        /* (*) wait cv for exit/exec */
  603 };
  604 
  605 #define p_session       p_pgrp->pg_session
  606 #define p_pgid          p_pgrp->pg_id
  607 
  608 #define NOCPU   0xff            /* For when we aren't on a CPU. */
  609 
  610 #define PROC_SLOCK(p)   mtx_lock_spin(&(p)->p_slock)
  611 #define PROC_SUNLOCK(p) mtx_unlock_spin(&(p)->p_slock)
  612 #define PROC_SLOCK_ASSERT(p, type)      mtx_assert(&(p)->p_slock, (type))
  613 
  614 /* These flags are kept in p_flag. */
  615 #define P_ADVLOCK       0x00001 /* Process may hold a POSIX advisory lock. */
  616 #define P_CONTROLT      0x00002 /* Has a controlling terminal. */
  617 #define P_KTHREAD       0x00004 /* Kernel thread (*). */
  618 #define P_NOLOAD        0x00008 /* Ignore during load avg calculations. */
  619 #define P_PPWAIT        0x00010 /* Parent is waiting for child to exec/exit. */
  620 #define P_PROFIL        0x00020 /* Has started profiling. */
  621 #define P_STOPPROF      0x00040 /* Has thread requesting to stop profiling. */
  622 #define P_HADTHREADS    0x00080 /* Has had threads (no cleanup shortcuts) */
  623 #define P_SUGID         0x00100 /* Had set id privileges since last exec. */
  624 #define P_SYSTEM        0x00200 /* System proc: no sigs, stats or swapping. */
  625 #define P_SINGLE_EXIT   0x00400 /* Threads suspending should exit, not wait. */
  626 #define P_TRACED        0x00800 /* Debugged process being traced. */
  627 #define P_WAITED        0x01000 /* Someone is waiting for us. */
  628 #define P_WEXIT         0x02000 /* Working on exiting. */
  629 #define P_EXEC          0x04000 /* Process called exec. */
  630 #define P_SA            0x08000 /* Using scheduler activations. */
  631 #define P_CONTINUED     0x10000 /* Proc has continued from a stopped state. */
  632 #define P_STOPPED_SIG   0x20000 /* Stopped due to SIGSTOP/SIGTSTP. */
  633 #define P_STOPPED_TRACE 0x40000 /* Stopped because of tracing. */
  634 #define P_STOPPED_SINGLE 0x80000 /* Only 1 thread can continue (not to user). */
  635 #define P_PROTECTED     0x100000 /* Do not kill on memory overcommit. */
  636 #define P_SIGEVENT      0x200000 /* Process pending signals changed. */
  637 #define P_SINGLE_BOUNDARY 0x400000 /* Threads should suspend at user boundary. */
  638 #define P_HWPMC         0x800000 /* Process is using HWPMCs */
  639 
  640 #define P_JAILED        0x1000000 /* Process is in jail. */
  641 #define P_INEXEC        0x4000000 /* Process is in execve(). */
  642 #define P_STATCHILD     0x8000000 /* Child process stopped or exited. */
  643 #define P_INMEM         0x10000000 /* Loaded into memory. */
  644 #define P_SWAPPINGOUT   0x20000000 /* Process is being swapped out. */
  645 #define P_SWAPPINGIN    0x40000000 /* Process is being swapped in. */
  646 
  647 #define P_STOPPED       (P_STOPPED_SIG|P_STOPPED_SINGLE|P_STOPPED_TRACE)
  648 #define P_SHOULDSTOP(p) ((p)->p_flag & P_STOPPED)
  649 
  650 /*
  651  * These were process status values (p_stat), now they are only used in
  652  * legacy conversion code.
  653  */
  654 #define SIDL    1               /* Process being created by fork. */
  655 #define SRUN    2               /* Currently runnable. */
  656 #define SSLEEP  3               /* Sleeping on an address. */
  657 #define SSTOP   4               /* Process debugging or suspension. */
  658 #define SZOMB   5               /* Awaiting collection by parent. */
  659 #define SWAIT   6               /* Waiting for interrupt. */
  660 #define SLOCK   7               /* Blocked on a lock. */
  661 
  662 #define P_MAGIC         0xbeefface
  663 
  664 #ifdef _KERNEL
  665 
  666 /* Flags for mi_switch(). */
  667 #define SW_VOL          0x0001          /* Voluntary switch. */
  668 #define SW_INVOL        0x0002          /* Involuntary switch. */
  669 #define SW_PREEMPT      0x0004          /* The invol switch is a preemption */
  670 
  671 /* How values for thread_single(). */
  672 #define SINGLE_NO_EXIT  0
  673 #define SINGLE_EXIT     1
  674 #define SINGLE_BOUNDARY 2
  675 
  676 /* XXXKSE: Missing values for thread_suspend_check(). */
  677 
  678 #ifdef MALLOC_DECLARE
  679 MALLOC_DECLARE(M_PARGS);
  680 MALLOC_DECLARE(M_PGRP);
  681 MALLOC_DECLARE(M_SESSION);
  682 MALLOC_DECLARE(M_SUBPROC);
  683 #endif
  684 
  685 #define FOREACH_PROC_IN_SYSTEM(p)                                       \
  686         LIST_FOREACH((p), &allproc, p_list)
  687 #define FOREACH_THREAD_IN_PROC(p, td)                                   \
  688         TAILQ_FOREACH((td), &(p)->p_threads, td_plist)
  689 #define FOREACH_UPCALL_IN_PROC(p, ku)                                   \
  690         TAILQ_FOREACH((ku), &(p)->p_upcalls, ku_link)
  691 
  692 /* XXXKSE the following lines should probably only be used in 1:1 code: */
  693 #define FIRST_THREAD_IN_PROC(p) TAILQ_FIRST(&(p)->p_threads)
  694 
  695 /*
  696  * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
  697  * as it is used to represent "no process group".
  698  */
  699 #define PID_MAX         99999
  700 #define NO_PID          100000
  701 
  702 #define SESS_LEADER(p)  ((p)->p_session->s_leader == (p))
  703 #define SESSHOLD(s)     ((s)->s_count++)
  704 #define SESSRELE(s)     sessrele(s)
  705 
  706 
  707 #define STOPEVENT(p, e, v) do {                                         \
  708         if ((p)->p_stops & (e)) {                                       \
  709                 PROC_LOCK(p);                                           \
  710                 stopevent((p), (e), (v));                               \
  711                 PROC_UNLOCK(p);                                         \
  712         }                                                               \
  713 } while (0)
  714 #define _STOPEVENT(p, e, v) do {                                        \
  715         PROC_LOCK_ASSERT(p, MA_OWNED);                                  \
  716         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, &p->p_mtx.lock_object, \
  717             "checking stopevent %d", (e));                              \
  718         if ((p)->p_stops & (e))                                         \
  719                 stopevent((p), (e), (v));                               \
  720 } while (0)
  721 
  722 /* Lock and unlock a process. */
  723 #define PROC_LOCK(p)    mtx_lock(&(p)->p_mtx)
  724 #define PROC_TRYLOCK(p) mtx_trylock(&(p)->p_mtx)
  725 #define PROC_UNLOCK(p)  mtx_unlock(&(p)->p_mtx)
  726 #define PROC_LOCKED(p)  mtx_owned(&(p)->p_mtx)
  727 #define PROC_LOCK_ASSERT(p, type)       mtx_assert(&(p)->p_mtx, (type))
  728 
  729 /* Lock and unlock a process group. */
  730 #define PGRP_LOCK(pg)   mtx_lock(&(pg)->pg_mtx)
  731 #define PGRP_UNLOCK(pg) mtx_unlock(&(pg)->pg_mtx)
  732 #define PGRP_LOCKED(pg) mtx_owned(&(pg)->pg_mtx)
  733 #define PGRP_LOCK_ASSERT(pg, type)      mtx_assert(&(pg)->pg_mtx, (type))
  734 
  735 #define PGRP_LOCK_PGSIGNAL(pg) do {                                     \
  736         if ((pg) != NULL)                                               \
  737                 PGRP_LOCK(pg);                                          \
  738 } while (0)
  739 #define PGRP_UNLOCK_PGSIGNAL(pg) do {                                   \
  740         if ((pg) != NULL)                                               \
  741                 PGRP_UNLOCK(pg);                                        \
  742 } while (0)
  743 
  744 /* Lock and unlock a session. */
  745 #define SESS_LOCK(s)    mtx_lock(&(s)->s_mtx)
  746 #define SESS_UNLOCK(s)  mtx_unlock(&(s)->s_mtx)
  747 #define SESS_LOCKED(s)  mtx_owned(&(s)->s_mtx)
  748 #define SESS_LOCK_ASSERT(s, type)       mtx_assert(&(s)->s_mtx, (type))
  749 
  750 /* Hold process U-area in memory, normally for ptrace/procfs work. */
  751 #define PHOLD(p) do {                                                   \
  752         PROC_LOCK(p);                                                   \
  753         _PHOLD(p);                                                      \
  754         PROC_UNLOCK(p);                                                 \
  755 } while (0)
  756 #define _PHOLD(p) do {                                                  \
  757         PROC_LOCK_ASSERT((p), MA_OWNED);                                \
  758         KASSERT(!((p)->p_flag & P_WEXIT) || (p) == curproc,             \
  759             ("PHOLD of exiting process"));                              \
  760         (p)->p_lock++;                                                  \
  761         if (((p)->p_flag & P_INMEM) == 0)                               \
  762                 faultin((p));                                           \
  763 } while (0)
  764 #define PROC_ASSERT_HELD(p) do {                                        \
  765         KASSERT((p)->p_lock > 0, ("process not held"));                 \
  766 } while (0)
  767 
  768 #define PRELE(p) do {                                                   \
  769         PROC_LOCK((p));                                                 \
  770         _PRELE((p));                                                    \
  771         PROC_UNLOCK((p));                                               \
  772 } while (0)
  773 #define _PRELE(p) do {                                                  \
  774         PROC_LOCK_ASSERT((p), MA_OWNED);                                \
  775         (--(p)->p_lock);                                                \
  776         if (((p)->p_flag & P_WEXIT) && (p)->p_lock == 0)                \
  777                 wakeup(&(p)->p_lock);                                   \
  778 } while (0)
  779 #define PROC_ASSERT_NOT_HELD(p) do {                                    \
  780         KASSERT((p)->p_lock == 0, ("process held"));                    \
  781 } while (0)
  782 
  783 /* Check whether a thread is safe to be swapped out. */
  784 #define thread_safetoswapout(td) (TD_IS_SLEEPING(td) || TD_IS_SUSPENDED(td))
  785 
  786 /* Control whether or not it is safe for curthread to sleep. */
  787 #define THREAD_NO_SLEEPING() do {                                       \
  788         KASSERT(!(curthread->td_pflags & TDP_NOSLEEPING),               \
  789             ("nested no sleeping"));                                    \
  790         curthread->td_pflags |= TDP_NOSLEEPING;                         \
  791 } while (0)
  792 
  793 #define THREAD_SLEEPING_OK() do {                                       \
  794         KASSERT((curthread->td_pflags & TDP_NOSLEEPING),                \
  795             ("nested sleeping ok"));                                    \
  796         curthread->td_pflags &= ~TDP_NOSLEEPING;                        \
  797 } while (0)
  798 
  799 #define PIDHASH(pid)    (&pidhashtbl[(pid) & pidhash])
  800 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
  801 extern u_long pidhash;
  802 
  803 #define PGRPHASH(pgid)  (&pgrphashtbl[(pgid) & pgrphash])
  804 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
  805 extern u_long pgrphash;
  806 
  807 extern struct sx allproc_lock;
  808 extern struct sx proctree_lock;
  809 extern struct mtx ppeers_lock;
  810 extern struct proc proc0;               /* Process slot for swapper. */
  811 extern struct thread thread0;           /* Primary thread in proc0. */
  812 extern struct vmspace vmspace0;         /* VM space for proc0. */
  813 extern int hogticks;                    /* Limit on kernel cpu hogs. */
  814 extern int lastpid;
  815 extern int nprocs, maxproc;             /* Current and max number of procs. */
  816 extern int maxprocperuid;               /* Max procs per uid. */
  817 extern u_long ps_arg_cache_limit;
  818 
  819 LIST_HEAD(proclist, proc);
  820 TAILQ_HEAD(procqueue, proc);
  821 TAILQ_HEAD(threadqueue, thread);
  822 extern struct proclist allproc;         /* List of all processes. */
  823 extern struct proclist zombproc;        /* List of zombie processes. */
  824 extern struct proc *initproc, *pageproc; /* Process slots for init, pager. */
  825 
  826 extern struct uma_zone *proc_zone;
  827 
  828 struct  proc *pfind(pid_t);             /* Find process by id. */
  829 struct  pgrp *pgfind(pid_t);            /* Find process group by id. */
  830 struct  proc *zpfind(pid_t);            /* Find zombie process by id. */
  831 
  832 void    ast(struct trapframe *framep);
  833 struct  thread *choosethread(void);
  834 int     cr_cansignal(struct ucred *cred, struct proc *proc, int signum);
  835 int     enterpgrp(struct proc *p, pid_t pgid, struct pgrp *pgrp,
  836             struct session *sess);
  837 int     enterthispgrp(struct proc *p, struct pgrp *pgrp);
  838 void    faultin(struct proc *p);
  839 void    fixjobc(struct proc *p, struct pgrp *pgrp, int entering);
  840 int     fork1(struct thread *, int, int, struct proc **);
  841 void    fork_exit(void (*)(void *, struct trapframe *), void *,
  842             struct trapframe *);
  843 void    fork_return(struct thread *, struct trapframe *);
  844 int     inferior(struct proc *p);
  845 void    kick_proc0(void);
  846 int     leavepgrp(struct proc *p);
  847 int     maybe_preempt(struct thread *td);
  848 void    mi_switch(int flags, struct thread *newtd);
  849 int     p_candebug(struct thread *td, struct proc *p);
  850 int     p_cansee(struct thread *td, struct proc *p);
  851 int     p_cansched(struct thread *td, struct proc *p);
  852 int     p_cansignal(struct thread *td, struct proc *p, int signum);
  853 int     p_canwait(struct thread *td, struct proc *p);
  854 struct  pargs *pargs_alloc(int len);
  855 void    pargs_drop(struct pargs *pa);
  856 void    pargs_hold(struct pargs *pa);
  857 void    procinit(void);
  858 void    proc_linkup0(struct proc *p, struct thread *td);
  859 void    proc_linkup(struct proc *p, struct thread *td);
  860 void    proc_reparent(struct proc *child, struct proc *newparent);
  861 struct  pstats *pstats_alloc(void);
  862 void    pstats_fork(struct pstats *src, struct pstats *dst);
  863 void    pstats_free(struct pstats *ps);
  864 int     securelevel_ge(struct ucred *cr, int level);
  865 int     securelevel_gt(struct ucred *cr, int level);
  866 void    sessrele(struct session *);
  867 int     setrunnable(struct thread *);
  868 void    setsugid(struct proc *p);
  869 int     sigonstack(size_t sp);
  870 void    sleepinit(void);
  871 void    stopevent(struct proc *, u_int, u_int);
  872 void    threadinit(void);
  873 void    cpu_idle(void);
  874 extern  void (*cpu_idle_hook)(void);    /* Hook to machdep CPU idler. */
  875 void    cpu_switch(struct thread *, struct thread *, struct mtx *);
  876 void    cpu_throw(struct thread *, struct thread *) __dead2;
  877 void    unsleep(struct thread *);
  878 void    userret(struct thread *, struct trapframe *);
  879 
  880 void    cpu_exit(struct thread *);
  881 void    exit1(struct thread *, int) __dead2;
  882 void    cpu_fork(struct thread *, struct proc *, struct thread *, int);
  883 void    cpu_set_fork_handler(struct thread *, void (*)(void *), void *);
  884 
  885 /* New in KSE. */
  886 #ifdef KSE
  887 void    kse_unlink(struct thread *);
  888 void    kseinit(void);
  889 void    upcall_reap(void);
  890 void    upcall_remove(struct thread *td);
  891 #endif
  892 void    cpu_set_upcall(struct thread *td, struct thread *td0);
  893 void    cpu_set_upcall_kse(struct thread *, void (*)(void *), void *, stack_t *);
  894 int     cpu_set_user_tls(struct thread *, void *tls_base);
  895 void    cpu_thread_alloc(struct thread *);
  896 void    cpu_thread_clean(struct thread *);
  897 void    cpu_thread_exit(struct thread *);
  898 void    cpu_thread_free(struct thread *);
  899 void    cpu_thread_swapin(struct thread *);
  900 void    cpu_thread_swapout(struct thread *);
  901 struct  thread *thread_alloc(void);
  902 void    thread_continued(struct proc *p);
  903 void    thread_exit(void) __dead2;
  904 int     thread_export_context(struct thread *td, int willexit);
  905 void    thread_free(struct thread *td);
  906 void    thread_link(struct thread *td, struct proc *p);
  907 void    thread_reap(void);
  908 void    thread_signal_add(struct thread *td, ksiginfo_t *);
  909 int     thread_single(int how);
  910 void    thread_single_end(void);
  911 void    thread_stash(struct thread *td);
  912 int     thread_statclock(int user);
  913 void    thread_stopped(struct proc *p);
  914 void    childproc_stopped(struct proc *child, int reason);
  915 void    childproc_continued(struct proc *child);
  916 void    childproc_exited(struct proc *child);
  917 int     thread_suspend_check(int how);
  918 void    thread_suspend_switch(struct thread *);
  919 void    thread_suspend_one(struct thread *td);
  920 struct thread *thread_switchout(struct thread *td, int flags,
  921             struct thread *newtd);
  922 void    thread_unlink(struct thread *td);
  923 void    thread_unsuspend(struct proc *p);
  924 int     thread_unsuspend_one(struct thread *td);
  925 void    thread_unthread(struct thread *td);
  926 int     thread_userret(struct thread *td, struct trapframe *frame);
  927 void    thread_user_enter(struct thread *td);
  928 void    thread_wait(struct proc *p);
  929 struct thread   *thread_find(struct proc *p, lwpid_t tid);
  930 void    thr_exit1(void);
  931 
  932 #endif  /* _KERNEL */
  933 
  934 #endif  /* !_SYS_PROC_H_ */

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