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: releng/6.1/sys/sys/proc.h 158179 2006-04-30 16:44:43Z cvs2svn $
   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 #ifndef _KERNEL
   44 #include <sys/filedesc.h>
   45 #endif
   46 #include <sys/queue.h>
   47 #include <sys/_lock.h>
   48 #include <sys/_mutex.h>
   49 #include <sys/priority.h>
   50 #include <sys/rtprio.h>                 /* XXX. */
   51 #include <sys/runq.h>
   52 #include <sys/sigio.h>
   53 #include <sys/signal.h>
   54 #ifndef _KERNEL
   55 #include <sys/time.h>                   /* For structs itimerval, timeval. */
   56 #else
   57 #include <sys/pcpu.h>
   58 #endif
   59 #include <sys/ucontext.h>
   60 #include <sys/ucred.h>
   61 #include <machine/proc.h>               /* Machine-dependent proc substruct. */
   62 
   63 /*
   64  * One structure allocated per session.
   65  *
   66  * List of locks
   67  * (m)          locked by s_mtx mtx
   68  * (e)          locked by proctree_lock sx
   69  * (c)          const until freeing
   70  */
   71 struct session {
   72         int             s_count;        /* (m) Ref cnt; pgrps in session. */
   73         struct proc     *s_leader;      /* (m + e) Session leader. */
   74         struct vnode    *s_ttyvp;       /* (m) Vnode of controlling tty. */
   75         struct tty      *s_ttyp;        /* (m) Controlling tty. */
   76         pid_t           s_sid;          /* (c) Session ID. */
   77                                         /* (m) Setlogin() name: */
   78         char            s_login[roundup(MAXLOGNAME, sizeof(long))];
   79         struct mtx      s_mtx;          /* Mutex to protect members. */
   80 };
   81 
   82 /*
   83  * One structure allocated per process group.
   84  *
   85  * List of locks
   86  * (m)          locked by pg_mtx mtx
   87  * (e)          locked by proctree_lock sx
   88  * (c)          const until freeing
   89  */
   90 struct pgrp {
   91         LIST_ENTRY(pgrp) pg_hash;       /* (e) Hash chain. */
   92         LIST_HEAD(, proc) pg_members;   /* (m + e) Pointer to pgrp members. */
   93         struct session  *pg_session;    /* (c) Pointer to session. */
   94         struct sigiolst pg_sigiolst;    /* (m) List of sigio sources. */
   95         pid_t           pg_id;          /* (c) Process group id. */
   96         int             pg_jobc;        /* (m) Job control process count. */
   97         struct mtx      pg_mtx;         /* Mutex to protect members */
   98 };
   99 
  100 /*
  101  * pargs, used to hold a copy of the command line, if it had a sane length.
  102  */
  103 struct pargs {
  104         u_int   ar_ref;         /* Reference count. */
  105         u_int   ar_length;      /* Length. */
  106         u_char  ar_args[1];     /* Arguments. */
  107 };
  108 
  109 /*-
  110  * Description of a process.
  111  *
  112  * This structure contains the information needed to manage a thread of
  113  * control, known in UN*X as a process; it has references to substructures
  114  * containing descriptions of things that the process uses, but may share
  115  * with related processes.  The process structure and the substructures
  116  * are always addressable except for those marked "(CPU)" below,
  117  * which might be addressable only on a processor on which the process
  118  * is running.
  119  *
  120  * Below is a key of locks used to protect each member of struct proc.  The
  121  * lock is indicated by a reference to a specific character in parens in the
  122  * associated comment.
  123  *      * - not yet protected
  124  *      a - only touched by curproc or parent during fork/wait
  125  *      b - created at fork, never changes
  126  *              (exception aiods switch vmspaces, but they are also
  127  *              marked 'P_SYSTEM' so hopefully it will be left alone)
  128  *      c - locked by proc mtx
  129  *      d - locked by allproc_lock lock
  130  *      e - locked by proctree_lock lock
  131  *      f - session mtx
  132  *      g - process group mtx
  133  *      h - callout_lock mtx
  134  *      i - by curproc or the master session mtx
  135  *      j - locked by sched_lock mtx
  136  *      k - only accessed by curthread
  137  *      k*- only accessed by curthread and from an interrupt
  138  *      l - the attaching proc or attaching proc parent
  139  *      m - Giant
  140  *      n - not locked, lazy
  141  *      o - ktrace lock
  142  *      p - select lock (sellock)
  143  *      q - td_contested lock
  144  *      r - p_peers lock
  145  *      x - created at fork, only changes during single threading in exec
  146  *      z - zombie threads/ksegroup lock
  147  *
  148  * If the locking key specifies two identifiers (for example, p_pptr) then
  149  * either lock is sufficient for read access, but both locks must be held
  150  * for write access.
  151  */
  152 struct kg_sched;
  153 struct nlminfo;
  154 struct kaioinfo;
  155 struct p_sched;
  156 struct sleepqueue;
  157 struct td_sched;
  158 struct trapframe;
  159 struct turnstile;
  160 
  161 /*
  162  * Here we define the three structures used for process information.
  163  *
  164  * The first is the thread. It might be thought of as a "Kernel
  165  * Schedulable Entity Context".
  166  * This structure contains all the information as to where a thread of
  167  * execution is now, or was when it was suspended, why it was suspended,
  168  * and anything else that will be needed to restart it when it is
  169  * rescheduled. Always associated with a KSE when running, but can be
  170  * reassigned to an equivalent KSE when being restarted for
  171  * load balancing. Each of these is associated with a kernel stack
  172  * and a pcb.
  173  *
  174  * It is important to remember that a particular thread structure may only
  175  * exist as long as the system call or kernel entrance (e.g. by pagefault)
  176  * which it is currently executing. It should therefore NEVER be referenced
  177  * by pointers in long lived structures that live longer than a single
  178  * request. If several threads complete their work at the same time,
  179  * they will all rewind their stacks to the user boundary, report their
  180  * completion state, and all but one will be freed. That last one will
  181  * be kept to provide a kernel stack and pcb for the NEXT syscall or kernel
  182  * entrance (basically to save freeing and then re-allocating it).  The existing
  183  * thread keeps a cached spare thread available to allow it to quickly
  184  * get one when it needs a new one. There is also a system
  185  * cache of free threads. Threads have priority and partake in priority
  186  * inheritance schemes.
  187  */
  188 struct thread;
  189 
  190 /*
  191  * The KSEGRP is allocated resources across a number of CPUs.
  192  * (Including a number of CPUxQUANTA. It parcels these QUANTA up among
  193  * its threads, each of which should be running in a different CPU.
  194  * BASE priority and total available quanta are properties of a KSEGRP.
  195  * Multiple KSEGRPs in a single process compete against each other
  196  * for total quanta in the same way that a forked child competes against
  197  * it's parent process.
  198  */
  199 struct ksegrp;
  200 
  201 /*
  202  * A process is the owner of all system resources allocated to a task
  203  * except CPU quanta.
  204  * All KSEGs under one process see, and have the same access to, these
  205  * resources (e.g. files, memory, sockets, credential, kqueues).
  206  * A process may compete for CPU cycles on the same basis as a
  207  * forked process cluster by spawning several KSEGRPs.
  208  */
  209 struct proc;
  210 
  211 /***************
  212  * In pictures:
  213  With a single run queue used by all processors:
  214 
  215  RUNQ: --->KSE---KSE--...               SLEEPQ:[]---THREAD---THREAD---THREAD
  216              \      \                          []---THREAD
  217       KSEG---THREAD--THREAD--THREAD            []
  218                                                []---THREAD---THREAD
  219 
  220   (processors run THREADs from the KSEG until they are exhausted or
  221   the KSEG exhausts its quantum)
  222 
  223 With PER-CPU run queues:
  224 KSEs on the separate run queues directly
  225 They would be given priorities calculated from the KSEG.
  226 
  227  *
  228  *****************/
  229 
  230 /*
  231  * Kernel runnable context (thread).
  232  * This is what is put to sleep and reactivated.
  233  * The first KSE available in the correct group will run this thread.
  234  * If several are available, use the one on the same CPU as last time.
  235  * When waiting to be run, threads are hung off the KSEGRP in priority order.
  236  * With N runnable and queued KSEs in the KSEGRP, the first N threads
  237  * are linked to them. Other threads are not yet assigned.
  238  */
  239 struct thread {
  240         struct proc     *td_proc;       /* (*) Associated process. */
  241         struct ksegrp   *td_ksegrp;     /* (*) Associated KSEG. */
  242         TAILQ_ENTRY(thread) td_plist;   /* (*) All threads in this proc. */
  243         TAILQ_ENTRY(thread) td_kglist;  /* (*) All threads in this ksegrp. */
  244 
  245         /* The two queues below should someday be merged. */
  246         TAILQ_ENTRY(thread) td_slpq;    /* (j) Sleep queue. */
  247         TAILQ_ENTRY(thread) td_lockq;   /* (j) Lock queue. */
  248         TAILQ_ENTRY(thread) td_runq;    /* (j/z) Run queue(s). XXXKSE */
  249 
  250         TAILQ_HEAD(, selinfo) td_selq;  /* (p) List of selinfos. */
  251         struct sleepqueue *td_sleepqueue; /* (k) Associated sleep queue. */
  252         struct turnstile *td_turnstile; /* (k) Associated turnstile. */
  253         struct umtx_q   *td_umtxq;      /* (c?) Link for when we're blocked. */
  254         lwpid_t         td_tid;         /* (b) Thread ID. */
  255 
  256 /* Cleared during fork1() or thread_schedule_upcall(). */
  257 #define td_startzero td_flags
  258         int             td_flags;       /* (j) TDF_* flags. */
  259         int             td_inhibitors;  /* (j) Why can not run. */
  260         int             td_pflags;      /* (k) Private thread (TDP_*) flags. */
  261         int             td_dupfd;       /* (k) Ret value from fdopen. XXX */
  262         void            *td_wchan;      /* (j) Sleep address. */
  263         const char      *td_wmesg;      /* (j) Reason for sleep. */
  264         u_char          td_lastcpu;     /* (j) Last cpu we were on. */
  265         u_char          td_oncpu;       /* (j) Which cpu we are on. */
  266         volatile u_char td_owepreempt;  /* (k*) Preempt on last critical_exit */
  267         short           td_locks;       /* (k) DEBUG: lockmgr count of locks. */
  268         struct turnstile *td_blocked;   /* (j) Lock process is blocked on. */
  269         void            *td_ithd;       /* (n) Unused, kept to preserve ABI. */
  270         const char      *td_lockname;   /* (j) Name of lock blocked on. */
  271         LIST_HEAD(, turnstile) td_contested;    /* (q) Contested locks. */
  272         struct lock_list_entry *td_sleeplocks; /* (k) Held sleep locks. */
  273         int             td_intr_nesting_level; /* (k) Interrupt recursion. */
  274         int             td_pinned;      /* (k) Temporary cpu pin count. */
  275         struct kse_thr_mailbox *td_mailbox; /* (*) Userland mailbox address. */
  276         struct ucred    *td_ucred;      /* (k) Reference to credentials. */
  277         struct thread   *td_standin;    /* (k + a) Use this for an upcall. */
  278         struct kse_upcall *td_upcall;   /* (k + j) Upcall structure. */
  279         u_int64_t       td_sticks;      /* (k) Statclock hits in system mode. */
  280         u_int           td_uuticks;     /* (k) Statclock hits (usr), for UTS. */
  281         u_int           td_usticks;     /* (k) Statclock hits (sys), for UTS. */
  282         int             td_intrval;     /* (j) Return value of TDF_INTERRUPT. */
  283         sigset_t        td_oldsigmask;  /* (k) Saved mask from pre sigpause. */
  284         sigset_t        td_sigmask;     /* (c) Current signal mask. */
  285         sigset_t        td_siglist;     /* (c) Sigs arrived, not delivered. */
  286         volatile u_int  td_generation;  /* (k) For detection of preemption */
  287         stack_t         td_sigstk;      /* (k) Stack ptr and on-stack flag. */
  288         int             td_kflags;      /* (c) Flags for KSE threading. */
  289         int             td_xsig;        /* (c) Signal for ptrace */
  290         u_long          td_profil_addr; /* (k) Temporary addr until AST. */
  291         u_int           td_profil_ticks; /* (k) Temporary ticks until AST. */
  292 #define td_endzero td_base_pri
  293 
  294 /* Copied during fork1() or thread_sched_upcall(). */
  295 #define td_startcopy td_endzero
  296         u_char          td_base_pri;    /* (j) Thread base kernel priority. */
  297         u_char          td_priority;    /* (j) Thread active priority. */
  298 #define td_endcopy td_pcb
  299 
  300 /*
  301  * Fields that must be manually set in fork1() or thread_sched_upcall()
  302  * or already have been set in the allocator, constructor, etc.
  303  */
  304         struct pcb      *td_pcb;        /* (k) Kernel VA of pcb and kstack. */
  305         enum {
  306                 TDS_INACTIVE = 0x0,
  307                 TDS_INHIBITED,
  308                 TDS_CAN_RUN,
  309                 TDS_RUNQ,
  310                 TDS_RUNNING
  311         } td_state;
  312         register_t      td_retval[2];   /* (k) Syscall aux returns. */
  313         struct callout  td_slpcallout;  /* (h) Callout for sleep. */
  314         struct trapframe *td_frame;     /* (k) */
  315         struct vm_object *td_kstack_obj;/* (a) Kstack object. */
  316         vm_offset_t     td_kstack;      /* (a) Kernel VA of kstack. */
  317         int             td_kstack_pages; /* (a) Size of the kstack. */
  318         struct vm_object *td_altkstack_obj;/* (a) Alternate kstack object. */
  319         vm_offset_t     td_altkstack;   /* (a) Kernel VA of alternate kstack. */
  320         int             td_altkstack_pages; /* (a) Size of alternate kstack. */
  321         volatile u_int  td_critnest;    /* (k*) Critical section nest level. */
  322         struct mdthread td_md;          /* (k) Any machine-dependent fields. */
  323         struct td_sched *td_sched;      /* (*) Scheduler-specific data. */
  324 };
  325 
  326 /*
  327  * Flags kept in td_flags:
  328  * To change these you MUST have the scheduler lock.
  329  */
  330 #define TDF_BORROWING   0x00000001 /* Thread is borrowing pri from another. */
  331 #define TDF_INPANIC     0x00000002 /* Caused a panic, let it drive crashdump. */
  332 #define TDF_SINTR       0x00000008 /* Sleep is interruptible. */
  333 #define TDF_TIMEOUT     0x00000010 /* Timing out during sleep. */
  334 #define TDF_IDLETD      0x00000020 /* This is a per-CPU idle thread. */
  335 #define TDF_SELECT      0x00000040 /* Selecting; wakeup/waiting danger. */
  336 #define TDF_SLEEPABORT  0x00000080 /* sleepq_abort was called. */
  337 #define TDF_TSNOBLOCK   0x00000100 /* Don't block on a turnstile due to race. */
  338 #define TDF_UNUSED9     0x00000200 /* --available -- */
  339 #define TDF_BOUNDARY    0x00000400 /* Thread suspended at user boundary */
  340 #define TDF_ASTPENDING  0x00000800 /* Thread has some asynchronous events. */
  341 #define TDF_TIMOFAIL    0x00001000 /* Timeout from sleep after we were awake. */
  342 #define TDF_INTERRUPT   0x00002000 /* Thread is marked as interrupted. */
  343 #define TDF_UNUSED14    0x00004000 /* --available -- */
  344 #define TDF_UNUSED15    0x00008000 /* --available -- */
  345 #define TDF_NEEDRESCHED 0x00010000 /* Thread needs to yield. */
  346 #define TDF_NEEDSIGCHK  0x00020000 /* Thread may need signal delivery. */
  347 #define TDF_XSIG        0x00040000 /* Thread is exchanging signal under trace */
  348 #define TDF_UMTXQ       0x00080000 /* Thread is sleeping on a umtx. */
  349 #define TDF_THRWAKEUP   0x00100000 /* Libthr thread must not suspend itself. */
  350 #define TDF_DBSUSPEND   0x00200000 /* Thread is suspended by debugger */
  351 #define TDF_UNUSED22    0x00400000 /* --available -- */
  352 #define TDF_UNUSED23    0x00800000 /* --available -- */
  353 #define TDF_SCHED0      0x01000000 /* Reserved for scheduler private use */
  354 #define TDF_SCHED1      0x02000000 /* Reserved for scheduler private use */
  355 #define TDF_SCHED2      0x04000000 /* Reserved for scheduler private use */
  356 #define TDF_SCHED3      0x08000000 /* Reserved for scheduler private use */
  357 
  358 /*
  359  * "Private" flags kept in td_pflags:
  360  * These are only accessed by curthread and thus need no locking.
  361  */
  362 #define TDP_OLDMASK     0x00000001 /* Need to restore mask after suspend. */
  363 #define TDP_INKTR       0x00000002 /* Thread is currently in KTR code. */
  364 #define TDP_INKTRACE    0x00000004 /* Thread is currently in KTRACE code. */
  365 #define TDP_UPCALLING   0x00000008 /* This thread is doing an upcall. */
  366 #define TDP_COWINPROGRESS 0x00000010 /* Snapshot copy-on-write in progress. */
  367 #define TDP_ALTSTACK    0x00000020 /* Have alternate signal stack. */
  368 #define TDP_DEADLKTREAT 0x00000040 /* Lock aquisition - deadlock treatment. */
  369 #define TDP_SA          0x00000080 /* A scheduler activation based thread. */
  370 #define TDP_NOSLEEPING  0x00000100 /* Thread is not allowed to sleep on a sq. */
  371 #define TDP_OWEUPC      0x00000200 /* Call addupc() at next AST. */
  372 #define TDP_ITHREAD     0x00000400 /* Thread is an interrupt thread. */
  373 #define TDP_CAN_UNBIND  0x00000800 /* Only temporarily bound. */
  374 #define TDP_SCHED1      0x00001000 /* Reserved for scheduler private use */
  375 #define TDP_SCHED2      0x00002000 /* Reserved for scheduler private use */
  376 #define TDP_SCHED3      0x00004000 /* Reserved for scheduler private use */
  377 #define TDP_SCHED4      0x00008000 /* Reserved for scheduler private use */
  378 #define TDP_GEOM        0x00010000 /* Settle GEOM before finishing syscall */
  379 #define TDP_SOFTDEP     0x00020000 /* Stuck processing softdep worklist */
  380 #define TDP_NORUNNINGBUF 0x00040000 /* Ignore runningbufspace check */
  381 
  382 /*
  383  * Reasons that the current thread can not be run yet.
  384  * More than one may apply.
  385  */
  386 #define TDI_SUSPENDED   0x0001  /* On suspension queue. */
  387 #define TDI_SLEEPING    0x0002  /* Actually asleep! (tricky). */
  388 #define TDI_SWAPPED     0x0004  /* Stack not in mem.  Bad juju if run. */
  389 #define TDI_LOCK        0x0008  /* Stopped on a lock. */
  390 #define TDI_IWAIT       0x0010  /* Awaiting interrupt. */
  391 
  392 /*
  393  * flags (in kflags) related to M:N threading.
  394  */
  395 #define TDK_KSEREL      0x0001  /* Blocked in msleep on kg->kg_completed. */
  396 #define TDK_KSERELSIG   0x0002  /* Blocked in msleep on p->p_siglist. */
  397 #define TDK_WAKEUP      0x0004  /* Thread has been woken by kse_wakeup. */
  398 
  399 #define TD_CAN_UNBIND(td)                       \
  400     (((td)->td_pflags & TDP_CAN_UNBIND) &&      \
  401      ((td)->td_upcall != NULL))
  402 
  403 #define TD_IS_SLEEPING(td)      ((td)->td_inhibitors & TDI_SLEEPING)
  404 #define TD_ON_SLEEPQ(td)        ((td)->td_wchan != NULL)
  405 #define TD_IS_SUSPENDED(td)     ((td)->td_inhibitors & TDI_SUSPENDED)
  406 #define TD_IS_SWAPPED(td)       ((td)->td_inhibitors & TDI_SWAPPED)
  407 #define TD_ON_LOCK(td)          ((td)->td_inhibitors & TDI_LOCK)
  408 #define TD_AWAITING_INTR(td)    ((td)->td_inhibitors & TDI_IWAIT)
  409 #define TD_IS_RUNNING(td)       ((td)->td_state == TDS_RUNNING)
  410 #define TD_ON_RUNQ(td)          ((td)->td_state == TDS_RUNQ)
  411 #define TD_CAN_RUN(td)          ((td)->td_state == TDS_CAN_RUN)
  412 #define TD_IS_INHIBITED(td)     ((td)->td_state == TDS_INHIBITED)
  413 
  414 #define TD_SET_INHIB(td, inhib) do {                    \
  415         (td)->td_state = TDS_INHIBITED;                 \
  416         (td)->td_inhibitors |= (inhib);                 \
  417 } while (0)
  418 
  419 #define TD_CLR_INHIB(td, inhib) do {                    \
  420         if (((td)->td_inhibitors & (inhib)) &&          \
  421             (((td)->td_inhibitors &= ~(inhib)) == 0))   \
  422                 (td)->td_state = TDS_CAN_RUN;           \
  423 } while (0)
  424 
  425 #define TD_SET_SLEEPING(td)     TD_SET_INHIB((td), TDI_SLEEPING)
  426 #define TD_SET_SWAPPED(td)      TD_SET_INHIB((td), TDI_SWAPPED)
  427 #define TD_SET_LOCK(td)         TD_SET_INHIB((td), TDI_LOCK)
  428 #define TD_SET_SUSPENDED(td)    TD_SET_INHIB((td), TDI_SUSPENDED)
  429 #define TD_SET_IWAIT(td)        TD_SET_INHIB((td), TDI_IWAIT)
  430 #define TD_SET_EXITING(td)      TD_SET_INHIB((td), TDI_EXITING)
  431 
  432 #define TD_CLR_SLEEPING(td)     TD_CLR_INHIB((td), TDI_SLEEPING)
  433 #define TD_CLR_SWAPPED(td)      TD_CLR_INHIB((td), TDI_SWAPPED)
  434 #define TD_CLR_LOCK(td)         TD_CLR_INHIB((td), TDI_LOCK)
  435 #define TD_CLR_SUSPENDED(td)    TD_CLR_INHIB((td), TDI_SUSPENDED)
  436 #define TD_CLR_IWAIT(td)        TD_CLR_INHIB((td), TDI_IWAIT)
  437 
  438 #define TD_SET_RUNNING(td)      (td)->td_state = TDS_RUNNING
  439 #define TD_SET_RUNQ(td)         (td)->td_state = TDS_RUNQ
  440 #define TD_SET_CAN_RUN(td)      (td)->td_state = TDS_CAN_RUN
  441 
  442 /*
  443  * An upcall is used when returning to userland.  If a thread does not have
  444  * an upcall on return to userland the thread exports its context and exits.
  445  */
  446 struct kse_upcall {
  447         TAILQ_ENTRY(kse_upcall) ku_link;        /* List of upcalls in KSEG. */
  448         struct ksegrp           *ku_ksegrp;     /* Associated KSEG. */
  449         struct thread           *ku_owner;      /* Owning thread. */
  450         int                     ku_flags;       /* KUF_* flags. */
  451         struct kse_mailbox      *ku_mailbox;    /* Userland mailbox address. */
  452         stack_t                 ku_stack;       /* Userland upcall stack. */
  453         void                    *ku_func;       /* Userland upcall function. */
  454         unsigned int            ku_mflags;      /* Cached upcall mbox flags. */
  455 };
  456 
  457 #define KUF_DOUPCALL    0x00001         /* Do upcall now; don't wait. */
  458 #define KUF_EXITING     0x00002         /* Upcall structure is exiting. */
  459 
  460 /*
  461  * Kernel-scheduled entity group (KSEG).  The scheduler considers each KSEG to
  462  * be an indivisible unit from a time-sharing perspective, though each KSEG may
  463  * contain multiple KSEs.
  464  */
  465 struct ksegrp {
  466         struct proc     *kg_proc;       /* (*) Proc that contains this KSEG. */
  467         TAILQ_ENTRY(ksegrp) kg_ksegrp;  /* (*) Queue of KSEGs in kg_proc. */
  468         TAILQ_HEAD(, thread) kg_threads;/* (td_kglist) All threads. */
  469         TAILQ_HEAD(, thread) kg_runq;   /* (td_runq) waiting RUNNABLE threads */
  470         TAILQ_HEAD(, kse_upcall) kg_upcalls;    /* All upcalls in the group. */
  471 
  472 #define kg_startzero kg_estcpu
  473         u_int           kg_estcpu;      /* (j) Sum of the same field in KSEs. */
  474         u_int           kg_slptime;     /* (j) How long completely blocked. */
  475         int             kg_numupcalls;  /* (j) Num upcalls. */
  476         int             kg_upsleeps;    /* (c) Num threads in kse_release(). */
  477         struct kse_thr_mailbox *kg_completed; /* (c) Completed thread mboxes. */
  478         int             kg_nextupcall;  /* (n) Next upcall time. */
  479         int             kg_upquantum;   /* (n) Quantum to schedule an upcall. */
  480 #define kg_endzero kg_pri_class
  481 
  482 #define kg_startcopy    kg_endzero
  483         u_char          kg_pri_class;   /* (j) Scheduling class. */
  484         u_char          kg_user_pri;    /* (j) User pri from estcpu and nice. */
  485 #define kg_endcopy kg_numthreads
  486         int             kg_numthreads;  /* (j) Num threads in total. */
  487         struct kg_sched *kg_sched;      /* (*) Scheduler-specific data. */
  488 };
  489 
  490 /*
  491  * XXX: Does this belong in resource.h or resourcevar.h instead?
  492  * Resource usage extension.  The times in rusage structs in the kernel are
  493  * never up to date.  The actual times are kept as runtimes and tick counts
  494  * (with control info in the "previous" times), and are converted when
  495  * userland asks for rusage info.  Backwards compatibility prevents putting
  496  * this directly in the user-visible rusage struct.
  497  *
  498  * Locking: (cj) means (j) for p_rux and (c) for p_crux.
  499  */
  500 struct rusage_ext {
  501         struct bintime  rux_runtime;    /* (cj) Real time. */
  502         u_int64_t       rux_uticks;     /* (cj) Statclock hits in user mode. */
  503         u_int64_t       rux_sticks;     /* (cj) Statclock hits in sys mode. */
  504         u_int64_t       rux_iticks;     /* (cj) Statclock hits in intr mode. */
  505         u_int64_t       rux_uu;         /* (c) Previous user time in usec. */
  506         u_int64_t       rux_su;         /* (c) Previous sys time in usec. */
  507         u_int64_t       rux_iu;         /* (c) Previous intr time in usec. */
  508 };
  509 
  510 /*
  511  * The old fashionned process. May have multiple threads, KSEGRPs
  512  * and KSEs. Starts off with a single embedded KSEGRP and THREAD.
  513  */
  514 struct proc {
  515         LIST_ENTRY(proc) p_list;        /* (d) List of all processes. */
  516         TAILQ_HEAD(, ksegrp) p_ksegrps; /* (c)(kg_ksegrp) All KSEGs. */
  517         TAILQ_HEAD(, thread) p_threads; /* (j)(td_plist) Threads. (shortcut) */
  518         TAILQ_HEAD(, thread) p_suspended; /* (td_runq) Suspended threads. */
  519         struct ucred    *p_ucred;       /* (c) Process owner's identity. */
  520         struct filedesc *p_fd;          /* (b) Open files. */
  521         struct filedesc_to_leader *p_fdtol; /* (b) Tracking node */
  522                                         /* Accumulated stats for all threads? */
  523         struct pstats   *p_stats;       /* (b) Accounting/statistics (CPU). */
  524         struct plimit   *p_limit;       /* (c) Process limits. */
  525         struct sigacts  *p_sigacts;     /* (x) Signal actions, state (CPU). */
  526 
  527         /*
  528          * The following don't make too much sense.
  529          * See the td_ or ke_ versions of the same flags.
  530          */
  531         int             p_flag;         /* (c) P_* flags. */
  532         int             p_sflag;        /* (j) PS_* flags. */
  533         enum {
  534                 PRS_NEW = 0,            /* In creation */
  535                 PRS_NORMAL,             /* threads can be run. */
  536                 PRS_ZOMBIE
  537         } p_state;                      /* (j/c) S* process status. */
  538 
  539         pid_t           p_pid;          /* (b) Process identifier. */
  540         LIST_ENTRY(proc) p_hash;        /* (d) Hash chain. */
  541         LIST_ENTRY(proc) p_pglist;      /* (g + e) List of processes in pgrp. */
  542         struct proc     *p_pptr;        /* (c + e) Pointer to parent process. */
  543         LIST_ENTRY(proc) p_sibling;     /* (e) List of sibling processes. */
  544         LIST_HEAD(, proc) p_children;   /* (e) Pointer to list of children. */
  545         struct mtx      p_mtx;          /* (n) Lock for this struct. */
  546 
  547 /* The following fields are all zeroed upon creation in fork. */
  548 #define p_startzero     p_oppid
  549         pid_t           p_oppid;        /* (c + e) Save ppid in ptrace. XXX */
  550         struct vmspace  *p_vmspace;     /* (b) Address space. */
  551         u_int           p_swtime;       /* (j) Time swapped in or out. */
  552         struct itimerval p_realtimer;   /* (c) Alarm timer. */
  553         struct rusage_ext p_rux;        /* (cj) Internal resource usage. */
  554         struct rusage_ext p_crux;       /* (c) Internal child resource usage. */
  555         int             p_profthreads;  /* (c) Num threads in addupc_task. */
  556         int             p_maxthrwaits;  /* (c) Max threads num waiters */
  557         int             p_traceflag;    /* (o) Kernel trace points. */
  558         struct vnode    *p_tracevp;     /* (c + o) Trace to vnode. */
  559         struct ucred    *p_tracecred;   /* (o) Credentials to trace with. */
  560         struct vnode    *p_textvp;      /* (b) Vnode of executable. */
  561         sigset_t        p_siglist;      /* (c) Sigs not delivered to a td. */
  562         char            p_lock;         /* (c) Proclock (prevent swap) count. */
  563         struct sigiolst p_sigiolst;     /* (c) List of sigio sources. */
  564         int             p_sigparent;    /* (c) Signal to parent on exit. */
  565         int             p_sig;          /* (n) For core dump/debugger XXX. */
  566         u_long          p_code;         /* (n) For core dump/debugger XXX. */
  567         u_int           p_stops;        /* (c) Stop event bitmask. */
  568         u_int           p_stype;        /* (c) Stop event type. */
  569         char            p_step;         /* (c) Process is stopped. */
  570         u_char          p_pfsflags;     /* (c) Procfs flags. */
  571         struct nlminfo  *p_nlminfo;     /* (?) Only used by/for lockd. */
  572         struct kaioinfo *p_aioinfo;     /* (c) ASYNC I/O info. */
  573         struct thread   *p_singlethread;/* (c + j) If single threading this is it */
  574         int             p_suspcount;    /* (c) Num threads in suspended mode. */
  575         struct thread   *p_xthread;     /* (c) Trap thread */
  576         int             p_boundary_count;/* (c) Num threads at user boundary */
  577         struct ksegrp   *p_procscopegrp;
  578 /* End area that is zeroed on creation. */
  579 #define p_endzero       p_magic
  580 
  581 /* The following fields are all copied upon creation in fork. */
  582 #define p_startcopy     p_endzero
  583         u_int           p_magic;        /* (b) Magic number. */
  584         char            p_comm[MAXCOMLEN + 1];  /* (b) Process name. */
  585         struct pgrp     *p_pgrp;        /* (c + e) Pointer to process group. */
  586         struct sysentvec *p_sysent;     /* (b) Syscall dispatch info. */
  587         struct pargs    *p_args;        /* (c) Process arguments. */
  588         rlim_t          p_cpulimit;     /* (j) Current CPU limit in seconds. */
  589         signed char     p_nice;         /* (c + j) Process "nice" value. */
  590 /* End area that is copied on creation. */
  591 #define p_endcopy       p_xstat
  592 
  593         u_short         p_xstat;        /* (c) Exit status; also stop sig. */
  594         struct knlist   p_klist;        /* (c) Knotes attached to this proc. */
  595         int             p_numthreads;   /* (j) Number of threads. */
  596         int             p_numksegrps;   /* (c) Number of ksegrps. */
  597         struct mdproc   p_md;           /* Any machine-dependent fields. */
  598         struct callout  p_itcallout;    /* (h + c) Interval timer callout. */
  599         u_short         p_acflag;       /* (c) Accounting flags. */
  600         struct rusage   *p_ru;          /* (a) Exit information. XXX */
  601         struct proc     *p_peers;       /* (r) */
  602         struct proc     *p_leader;      /* (b) */
  603         void            *p_emuldata;    /* (c) Emulator state data. */
  604         struct label    *p_label;       /* (*) Proc (not subject) MAC label. */
  605         struct p_sched  *p_sched;       /* (*) Scheduler-specific data. */
  606 };
  607 
  608 #define p_session       p_pgrp->pg_session
  609 #define p_pgid          p_pgrp->pg_id
  610 
  611 #define NOCPU   0xff            /* For when we aren't on a CPU. */
  612 
  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 
  644 #define P_STOPPED       (P_STOPPED_SIG|P_STOPPED_SINGLE|P_STOPPED_TRACE)
  645 #define P_SHOULDSTOP(p) ((p)->p_flag & P_STOPPED)
  646 
  647 /* These flags are kept in p_sflag and are protected with sched_lock. */
  648 #define PS_INMEM        0x00001 /* Loaded into memory. */
  649 #define PS_XCPU         0x00002 /* Exceeded CPU limit. */
  650 #define PS_ALRMPEND     0x00020 /* Pending SIGVTALRM needs to be posted. */
  651 #define PS_PROFPEND     0x00040 /* Pending SIGPROF needs to be posted. */
  652 #define PS_SWAPINREQ    0x00100 /* Swapin request due to wakeup. */
  653 #define PS_SWAPPINGOUT  0x00200 /* Process is being swapped out. */
  654 #define PS_SWAPPINGIN   0x04000 /* Process is being swapped in. */
  655 #define PS_MACPEND      0x08000 /* AST-based MAC event pending. */
  656 
  657 /*
  658  * These were process status values (p_stat), now they are only used in
  659  * legacy conversion code.
  660  */
  661 #define SIDL    1               /* Process being created by fork. */
  662 #define SRUN    2               /* Currently runnable. */
  663 #define SSLEEP  3               /* Sleeping on an address. */
  664 #define SSTOP   4               /* Process debugging or suspension. */
  665 #define SZOMB   5               /* Awaiting collection by parent. */
  666 #define SWAIT   6               /* Waiting for interrupt. */
  667 #define SLOCK   7               /* Blocked on a lock. */
  668 
  669 #define P_MAGIC         0xbeefface
  670 
  671 #ifdef _KERNEL
  672 
  673 /* Flags for mi_switch(). */
  674 #define SW_VOL          0x0001          /* Voluntary switch. */
  675 #define SW_INVOL        0x0002          /* Involuntary switch. */
  676 #define SW_PREEMPT      0x0004          /* The invol switch is a preemption */
  677 
  678 /* Flags for setrunqueue().  Why are we setting this thread on the run queue? */
  679 #define SRQ_BORING      0x0000          /* No special circumstances. */
  680 #define SRQ_YIELDING    0x0001          /* We are yielding (from mi_switch). */
  681 #define SRQ_OURSELF     0x0002          /* It is ourself (from mi_switch). */
  682 #define SRQ_INTR        0x0004          /* It is probably urgent. */
  683 #define SRQ_PREEMPTED   0x0008          /* has been preempted.. be kind */
  684 
  685 /* How values for thread_single(). */
  686 #define SINGLE_NO_EXIT  0
  687 #define SINGLE_EXIT     1
  688 #define SINGLE_BOUNDARY 2
  689 
  690 /* XXXKSE: Missing values for thread_suspsend_check(). */
  691 
  692 #ifdef MALLOC_DECLARE
  693 MALLOC_DECLARE(M_PARGS);
  694 MALLOC_DECLARE(M_PGRP);
  695 MALLOC_DECLARE(M_SESSION);
  696 MALLOC_DECLARE(M_SUBPROC);
  697 MALLOC_DECLARE(M_ZOMBIE);
  698 #endif
  699 
  700 #define FOREACH_PROC_IN_SYSTEM(p)                                       \
  701         LIST_FOREACH((p), &allproc, p_list)
  702 #define FOREACH_KSEGRP_IN_PROC(p, kg)                                   \
  703         TAILQ_FOREACH((kg), &(p)->p_ksegrps, kg_ksegrp)
  704 #define FOREACH_THREAD_IN_GROUP(kg, td)                                 \
  705         TAILQ_FOREACH((td), &(kg)->kg_threads, td_kglist)
  706 #define FOREACH_UPCALL_IN_GROUP(kg, ku)                                 \
  707         TAILQ_FOREACH((ku), &(kg)->kg_upcalls, ku_link)
  708 #define FOREACH_THREAD_IN_PROC(p, td)                                   \
  709         TAILQ_FOREACH((td), &(p)->p_threads, td_plist)
  710 
  711 /* XXXKSE the following lines should probably only be used in 1:1 code: */
  712 #define FIRST_THREAD_IN_PROC(p) TAILQ_FIRST(&(p)->p_threads)
  713 #define FIRST_KSEGRP_IN_PROC(p) TAILQ_FIRST(&(p)->p_ksegrps)
  714 
  715 /*
  716  * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
  717  * as it is used to represent "no process group".
  718  */
  719 #define PID_MAX         99999
  720 #define NO_PID          100000
  721 
  722 #define SESS_LEADER(p)  ((p)->p_session->s_leader == (p))
  723 #define SESSHOLD(s)     ((s)->s_count++)
  724 #define SESSRELE(s)     sessrele(s)
  725 
  726 
  727 #define STOPEVENT(p, e, v) do {                                         \
  728         if ((p)->p_stops & (e)) {                                       \
  729                 PROC_LOCK(p);                                           \
  730                 stopevent((p), (e), (v));                               \
  731                 PROC_UNLOCK(p);                                         \
  732         }                                                               \
  733 } while (0)
  734 #define _STOPEVENT(p, e, v) do {                                        \
  735         PROC_LOCK_ASSERT(p, MA_OWNED);                                  \
  736         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, &p->p_mtx.mtx_object, \
  737             "checking stopevent %d", (e));                              \
  738         if ((p)->p_stops & (e))                                         \
  739                 stopevent((p), (e), (v));                               \
  740 } while (0)
  741 
  742 /* Lock and unlock a process. */
  743 #define PROC_LOCK(p)    mtx_lock(&(p)->p_mtx)
  744 #define PROC_TRYLOCK(p) mtx_trylock(&(p)->p_mtx)
  745 #define PROC_UNLOCK(p)  mtx_unlock(&(p)->p_mtx)
  746 #define PROC_LOCKED(p)  mtx_owned(&(p)->p_mtx)
  747 #define PROC_LOCK_ASSERT(p, type)       mtx_assert(&(p)->p_mtx, (type))
  748 
  749 /* Lock and unlock a process group. */
  750 #define PGRP_LOCK(pg)   mtx_lock(&(pg)->pg_mtx)
  751 #define PGRP_UNLOCK(pg) mtx_unlock(&(pg)->pg_mtx)
  752 #define PGRP_LOCKED(pg) mtx_owned(&(pg)->pg_mtx)
  753 #define PGRP_LOCK_ASSERT(pg, type)      mtx_assert(&(pg)->pg_mtx, (type))
  754 
  755 #define PGRP_LOCK_PGSIGNAL(pg) do {                                     \
  756         if ((pg) != NULL)                                               \
  757                 PGRP_LOCK(pg);                                          \
  758 } while (0)
  759 #define PGRP_UNLOCK_PGSIGNAL(pg) do {                                   \
  760         if ((pg) != NULL)                                               \
  761                 PGRP_UNLOCK(pg);                                        \
  762 } while (0)
  763 
  764 /* Lock and unlock a session. */
  765 #define SESS_LOCK(s)    mtx_lock(&(s)->s_mtx)
  766 #define SESS_UNLOCK(s)  mtx_unlock(&(s)->s_mtx)
  767 #define SESS_LOCKED(s)  mtx_owned(&(s)->s_mtx)
  768 #define SESS_LOCK_ASSERT(s, type)       mtx_assert(&(s)->s_mtx, (type))
  769 
  770 /* Hold process U-area in memory, normally for ptrace/procfs work. */
  771 #define PHOLD(p) do {                                                   \
  772         PROC_LOCK(p);                                                   \
  773         _PHOLD(p);                                                      \
  774         PROC_UNLOCK(p);                                                 \
  775 } while (0)
  776 #define _PHOLD(p) do {                                                  \
  777         PROC_LOCK_ASSERT((p), MA_OWNED);                                \
  778         KASSERT(!((p)->p_flag & P_WEXIT) || (p) == curproc,             \
  779             ("PHOLD of exiting process"));                              \
  780         (p)->p_lock++;                                                  \
  781         if (((p)->p_sflag & PS_INMEM) == 0)                             \
  782                 faultin((p));                                           \
  783 } while (0)
  784 
  785 #define PRELE(p) do {                                                   \
  786         PROC_LOCK((p));                                                 \
  787         _PRELE((p));                                                    \
  788         PROC_UNLOCK((p));                                               \
  789 } while (0)
  790 #define _PRELE(p) do {                                                  \
  791         PROC_LOCK_ASSERT((p), MA_OWNED);                                \
  792         (--(p)->p_lock);                                                \
  793         if (((p)->p_flag & P_WEXIT) && (p)->p_lock == 0)                \
  794                 wakeup(&(p)->p_lock);                                   \
  795 } while (0)
  796 
  797 /* Check whether a thread is safe to be swapped out. */
  798 #define thread_safetoswapout(td) (TD_IS_SLEEPING(td) || TD_IS_SUSPENDED(td))
  799 
  800 /* Control whether or not it is safe for curthread to sleep. */
  801 #define THREAD_NO_SLEEPING() do {                                       \
  802         KASSERT(!(curthread->td_pflags & TDP_NOSLEEPING),               \
  803             ("nested no sleeping"));                                    \
  804         curthread->td_pflags |= TDP_NOSLEEPING;                         \
  805 } while (0)
  806 
  807 #define THREAD_SLEEPING_OK() do {                                       \
  808         KASSERT((curthread->td_pflags & TDP_NOSLEEPING),                \
  809             ("nested sleeping ok"));                                    \
  810         curthread->td_pflags &= ~TDP_NOSLEEPING;                        \
  811 } while (0)
  812 
  813 /* Lock and unlock process arguments. */
  814 #define PARGS_LOCK(p)           mtx_lock(&pargs_ref_lock)
  815 #define PARGS_UNLOCK(p)         mtx_unlock(&pargs_ref_lock)
  816 
  817 #define PIDHASH(pid)    (&pidhashtbl[(pid) & pidhash])
  818 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
  819 extern u_long pidhash;
  820 
  821 #define PGRPHASH(pgid)  (&pgrphashtbl[(pgid) & pgrphash])
  822 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
  823 extern u_long pgrphash;
  824 
  825 extern struct sx allproc_lock;
  826 extern struct sx proctree_lock;
  827 extern struct mtx pargs_ref_lock;
  828 extern struct mtx ppeers_lock;
  829 extern struct ksegrp ksegrp0;           /* Primary ksegrp in proc0. */
  830 extern struct proc proc0;               /* Process slot for swapper. */
  831 extern struct thread thread0;           /* Primary thread in proc0. */
  832 extern struct vmspace vmspace0;         /* VM space for proc0. */
  833 extern int hogticks;                    /* Limit on kernel cpu hogs. */
  834 extern int lastpid;
  835 extern int nprocs, maxproc;             /* Current and max number of procs. */
  836 extern int maxprocperuid;               /* Max procs per uid. */
  837 extern u_long ps_arg_cache_limit;
  838 extern int sched_quantum;               /* Scheduling quantum in ticks. */
  839 
  840 LIST_HEAD(proclist, proc);
  841 TAILQ_HEAD(procqueue, proc);
  842 TAILQ_HEAD(threadqueue, thread);
  843 extern struct proclist allproc;         /* List of all processes. */
  844 extern struct proclist zombproc;        /* List of zombie processes. */
  845 extern struct proc *initproc, *pageproc; /* Process slots for init, pager. */
  846 
  847 extern struct uma_zone *proc_zone;
  848 
  849 struct  proc *pfind(pid_t);             /* Find process by id. */
  850 struct  pgrp *pgfind(pid_t);            /* Find process group by id. */
  851 struct  proc *zpfind(pid_t);            /* Find zombie process by id. */
  852 
  853 void    adjustrunqueue(struct thread *, int newpri);
  854 void    ast(struct trapframe *framep);
  855 struct  thread *choosethread(void);
  856 int     cr_cansignal(struct ucred *cred, struct proc *proc, int signum);
  857 int     enterpgrp(struct proc *p, pid_t pgid, struct pgrp *pgrp,
  858             struct session *sess);
  859 int     enterthispgrp(struct proc *p, struct pgrp *pgrp);
  860 void    faultin(struct proc *p);
  861 void    fixjobc(struct proc *p, struct pgrp *pgrp, int entering);
  862 int     fork1(struct thread *, int, int, struct proc **);
  863 void    fork_exit(void (*)(void *, struct trapframe *), void *,
  864             struct trapframe *);
  865 void    fork_return(struct thread *, struct trapframe *);
  866 int     inferior(struct proc *p);
  867 void    kick_proc0(void);
  868 int     leavepgrp(struct proc *p);
  869 int     maybe_preempt(struct thread *td);
  870 void    mi_switch(int flags, struct thread *newtd);
  871 int     p_candebug(struct thread *td, struct proc *p);
  872 int     p_cansee(struct thread *td, struct proc *p);
  873 int     p_cansched(struct thread *td, struct proc *p);
  874 int     p_cansignal(struct thread *td, struct proc *p, int signum);
  875 int     p_canwait(struct thread *td, struct proc *p);
  876 struct  pargs *pargs_alloc(int len);
  877 void    pargs_drop(struct pargs *pa);
  878 void    pargs_free(struct pargs *pa);
  879 void    pargs_hold(struct pargs *pa);
  880 void    procinit(void);
  881 void    proc_linkup(struct proc *p, struct ksegrp *kg, struct thread *td);
  882 void    proc_reparent(struct proc *child, struct proc *newparent);
  883 struct  pstats *pstats_alloc(void);
  884 void    pstats_fork(struct pstats *src, struct pstats *dst);
  885 void    pstats_free(struct pstats *ps);
  886 int     securelevel_ge(struct ucred *cr, int level);
  887 int     securelevel_gt(struct ucred *cr, int level);
  888 void    sessrele(struct session *);
  889 void    setrunnable(struct thread *);
  890 void    setrunqueue(struct thread *, int flags);
  891 void    setsugid(struct proc *p);
  892 int     sigonstack(size_t sp);
  893 void    sleepinit(void);
  894 void    stopevent(struct proc *, u_int, u_int);
  895 void    threadinit(void);
  896 void    cpu_idle(void);
  897 extern  void (*cpu_idle_hook)(void);    /* Hook to machdep CPU idler. */
  898 void    cpu_switch(struct thread *old, struct thread *new);
  899 void    cpu_throw(struct thread *old, struct thread *new) __dead2;
  900 void    unsleep(struct thread *);
  901 void    userret(struct thread *, struct trapframe *, u_int);
  902 
  903 void    cpu_exit(struct thread *);
  904 void    exit1(struct thread *, int) __dead2;
  905 void    cpu_fork(struct thread *, struct proc *, struct thread *, int);
  906 void    cpu_set_fork_handler(struct thread *, void (*)(void *), void *);
  907 
  908 /* New in KSE. */
  909 struct  ksegrp *ksegrp_alloc(void);
  910 void    ksegrp_free(struct ksegrp *kg);
  911 void    ksegrp_stash(struct ksegrp *kg);
  912 void    kse_GC(void);
  913 void    kseinit(void);
  914 void    cpu_set_upcall(struct thread *td, struct thread *td0);
  915 void    cpu_set_upcall_kse(struct thread *, void (*)(void *), void *, stack_t *);
  916 int     cpu_set_user_tls(struct thread *, void *tls_base);
  917 void    cpu_thread_clean(struct thread *);
  918 void    cpu_thread_exit(struct thread *);
  919 void    cpu_thread_setup(struct thread *td);
  920 void    cpu_thread_siginfo(int sig, u_long code, siginfo_t *si);
  921 void    cpu_thread_swapin(struct thread *);
  922 void    cpu_thread_swapout(struct thread *);
  923 void    ksegrp_link(struct ksegrp *kg, struct proc *p);
  924 void    ksegrp_unlink(struct ksegrp *kg);
  925 struct  thread *thread_alloc(void);
  926 void    thread_continued(struct proc *p);
  927 void    thread_exit(void) __dead2;
  928 int     thread_export_context(struct thread *td, int willexit);
  929 void    thread_free(struct thread *td);
  930 void    thread_link(struct thread *td, struct ksegrp *kg);
  931 void    thread_reap(void);
  932 struct thread *thread_schedule_upcall(struct thread *td, struct kse_upcall *ku);
  933 void    thread_signal_add(struct thread *td, int sig);
  934 int     thread_single(int how);
  935 void    thread_single_end(void);
  936 int     thread_sleep_check(struct thread *td);
  937 void    thread_stash(struct thread *td);
  938 int     thread_statclock(int user);
  939 void    thread_stopped(struct proc *p);
  940 int     thread_suspend_check(int how);
  941 void    thread_suspend_one(struct thread *td);
  942 struct thread *thread_switchout(struct thread *td, int flags,
  943             struct thread *newtd);
  944 void    thread_unlink(struct thread *td);
  945 void    thread_unsuspend(struct proc *p);
  946 void    thread_unsuspend_one(struct thread *td);
  947 void    thread_unthread(struct thread *td);
  948 int     thread_userret(struct thread *td, struct trapframe *frame);
  949 void    thread_user_enter(struct thread *td);
  950 void    thread_wait(struct proc *p);
  951 void    thr_exit1(void);
  952 struct kse_upcall *upcall_alloc(void);
  953 void    upcall_free(struct kse_upcall *ku);
  954 void    upcall_link(struct kse_upcall *ku, struct ksegrp *kg);
  955 void    upcall_unlink(struct kse_upcall *ku);
  956 void    upcall_remove(struct thread *td);
  957 void    upcall_stash(struct kse_upcall *ke);
  958 
  959 #endif  /* _KERNEL */
  960 
  961 #endif  /* !_SYS_PROC_H_ */

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