FreeBSD/Linux Kernel Cross Reference
sys/sys/proc.h

     /*-
      * Copyright (c) 1986, 1989, 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)proc.h      8.15 (Berkeley) 5/19/95
     * $FreeBSD$
     */
    
    #ifndef _SYS_PROC_H_
    #define _SYS_PROC_H_
    
    #include <sys/callout.h>                /* For struct callout. */
    #include <sys/event.h>                  /* For struct klist. */
    #ifndef _KERNEL
    #include <sys/filedesc.h>
    #endif
    #include <sys/queue.h>
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    #include <sys/priority.h>
    #include <sys/rtprio.h>                 /* XXX. */
    #include <sys/runq.h>
    #include <sys/sigio.h>
    #include <sys/signal.h>
    #ifndef _KERNEL
    #include <sys/time.h>                   /* For structs itimerval, timeval. */
    #else
    #include <sys/pcpu.h>
    #endif
    #include <sys/ucontext.h>
    #include <sys/ucred.h>
    #include <machine/proc.h>               /* Machine-dependent proc substruct. */
    
    /*
     * One structure allocated per session.
     *
     * List of locks
     * (m)          locked by s_mtx mtx
     * (e)          locked by proctree_lock sx
     * (c)          const until freeing
     */
    struct session {
            int             s_count;        /* (m) Ref cnt; pgrps in session. */
            struct proc     *s_leader;      /* (m + e) Session leader. */
            struct vnode    *s_ttyvp;       /* (m) Vnode of controlling tty. */
            struct tty      *s_ttyp;        /* (m) Controlling tty. */
            pid_t           s_sid;          /* (c) Session ID. */
                                            /* (m) Setlogin() name: */
            char            s_login[roundup(MAXLOGNAME, sizeof(long))];
            struct mtx      s_mtx;          /* Mutex to protect members. */
    };
    
    /*
     * One structure allocated per process group.
     *
     * List of locks
     * (m)          locked by pg_mtx mtx
     * (e)          locked by proctree_lock sx
     * (c)          const until freeing
     */
    struct pgrp {
            LIST_ENTRY(pgrp) pg_hash;       /* (e) Hash chain. */
            LIST_HEAD(, proc) pg_members;   /* (m + e) Pointer to pgrp members. */
            struct session  *pg_session;    /* (c) Pointer to session. */
            struct sigiolst pg_sigiolst;    /* (m) List of sigio sources. */
            pid_t           pg_id;          /* (c) Process group id. */
            int             pg_jobc;        /* (m) Job control process count. */
            struct mtx      pg_mtx;         /* Mutex to protect members */
    };
    
   /*
    * pargs, used to hold a copy of the command line, if it had a sane length.
    */
   struct pargs {
           u_int   ar_ref;         /* Reference count. */
           u_int   ar_length;      /* Length. */
           u_char  ar_args[1];     /* Arguments. */
   };
   
   /*-
    * Description of a process.
    *
    * This structure contains the information needed to manage a thread of
    * control, known in UN*X as a process; it has references to substructures
    * containing descriptions of things that the process uses, but may share
    * with related processes.  The process structure and the substructures
    * are always addressable except for those marked "(CPU)" below,
    * which might be addressable only on a processor on which the process
    * is running.
    *
    * Below is a key of locks used to protect each member of struct proc.  The
    * lock is indicated by a reference to a specific character in parens in the
    * associated comment.
    *      * - not yet protected
    *      a - only touched by curproc or parent during fork/wait
    *      b - created at fork, never changes
    *              (exception aiods switch vmspaces, but they are also
    *              marked 'P_SYSTEM' so hopefully it will be left alone)
    *      c - locked by proc mtx
    *      d - locked by allproc_lock lock
    *      e - locked by proctree_lock lock
    *      f - session mtx
    *      g - process group mtx
    *      h - callout_lock mtx
    *      i - by curproc or the master session mtx
    *      j - locked by sched_lock mtx
    *      k - only accessed by curthread
    *      k*- only accessed by curthread and from an interrupt
    *      l - the attaching proc or attaching proc parent
    *      m - Giant
    *      n - not locked, lazy
    *      o - ktrace lock
    *      p - select lock (sellock)
    *      q - td_contested lock
    *      r - p_peers lock
    *      x - created at fork, only changes during single threading in exec
    *      z - zombie threads/ksegroup lock
    *
    * If the locking key specifies two identifiers (for example, p_pptr) then
    * either lock is sufficient for read access, but both locks must be held
    * for write access.
    */
   struct kaudit_record;
   struct kg_sched;
   struct nlminfo;
   struct kaioinfo;
   struct p_sched;
   struct sleepqueue;
   struct td_sched;
   struct trapframe;
   struct turnstile;
   
   /*
    * Here we define the three structures used for process information.
    *
    * The first is the thread. It might be thought of as a "Kernel
    * Schedulable Entity Context".
    * This structure contains all the information as to where a thread of
    * execution is now, or was when it was suspended, why it was suspended,
    * and anything else that will be needed to restart it when it is
    * rescheduled. Always associated with a KSE when running, but can be
    * reassigned to an equivalent KSE when being restarted for
    * load balancing. Each of these is associated with a kernel stack
    * and a pcb.
    *
    * It is important to remember that a particular thread structure may only
    * exist as long as the system call or kernel entrance (e.g. by pagefault)
    * which it is currently executing. It should therefore NEVER be referenced
    * by pointers in long lived structures that live longer than a single
    * request. If several threads complete their work at the same time,
    * they will all rewind their stacks to the user boundary, report their
    * completion state, and all but one will be freed. That last one will
    * be kept to provide a kernel stack and pcb for the NEXT syscall or kernel
    * entrance (basically to save freeing and then re-allocating it).  The existing
    * thread keeps a cached spare thread available to allow it to quickly
    * get one when it needs a new one. There is also a system
    * cache of free threads. Threads have priority and partake in priority
    * inheritance schemes.
    */
   struct thread;
   
   /*
    * The KSEGRP is allocated resources across a number of CPUs.
    * (Including a number of CPUxQUANTA. It parcels these QUANTA up among
    * its threads, each of which should be running in a different CPU.
    * BASE priority and total available quanta are properties of a KSEGRP.
    * Multiple KSEGRPs in a single process compete against each other
    * for total quanta in the same way that a forked child competes against
    * it's parent process.
    */
   struct ksegrp;
   
   /*
    * A process is the owner of all system resources allocated to a task
    * except CPU quanta.
    * All KSEGs under one process see, and have the same access to, these
    * resources (e.g. files, memory, sockets, credential, kqueues).
    * A process may compete for CPU cycles on the same basis as a
    * forked process cluster by spawning several KSEGRPs.
    */
   struct proc;
   
   /***************
    * In pictures:
    With a single run queue used by all processors:
   
    RUNQ: --->KSE---KSE--...               SLEEPQ:[]---THREAD---THREAD---THREAD
                \      \                          []---THREAD
         KSEG---THREAD--THREAD--THREAD            []
                                                  []---THREAD---THREAD
   
     (processors run THREADs from the KSEG until they are exhausted or
     the KSEG exhausts its quantum)
   
   With PER-CPU run queues:
   KSEs on the separate run queues directly
   They would be given priorities calculated from the KSEG.
   
    *
    *****************/
   
   /*
    * Kernel runnable context (thread).
    * This is what is put to sleep and reactivated.
    * The first KSE available in the correct group will run this thread.
    * If several are available, use the one on the same CPU as last time.
    * When waiting to be run, threads are hung off the KSEGRP in priority order.
    * With N runnable and queued KSEs in the KSEGRP, the first N threads
    * are linked to them. Other threads are not yet assigned.
    *
    * We must force at least 16 byte alignment for "struct thread"
    * because the rwlocks and sxlocks expect to use the bottom bits
    * of the pointer for bookkeeping information.
    *
    * This causes problems for the thread0 data structure because it
    * may not be properly aligned otherwise.
    */
   #define THREAD_ALIGN    16
   
   struct thread {
           struct proc     *td_proc;       /* (*) Associated process. */
           struct ksegrp   *td_ksegrp;     /* (*) Associated KSEG. */
           TAILQ_ENTRY(thread) td_plist;   /* (*) All threads in this proc. */
           TAILQ_ENTRY(thread) td_kglist;  /* (*) All threads in this ksegrp. */
   
           /* The two queues below should someday be merged. */
           TAILQ_ENTRY(thread) td_slpq;    /* (j) Sleep queue. */
           TAILQ_ENTRY(thread) td_lockq;   /* (j) Lock queue. */
           TAILQ_ENTRY(thread) td_runq;    /* (j/z) Run queue(s). XXXKSE */
   
           TAILQ_HEAD(, selinfo) td_selq;  /* (p) List of selinfos. */
           struct sleepqueue *td_sleepqueue; /* (k) Associated sleep queue. */
           struct turnstile *td_turnstile; /* (k) Associated turnstile. */
           struct umtx_q   *td_umtxq;      /* (c?) Link for when we're blocked. */
           lwpid_t         td_tid;         /* (b) Thread ID. */
   
   /* Cleared during fork1() or thread_schedule_upcall(). */
   #define td_startzero td_flags
           int             td_flags;       /* (j) TDF_* flags. */
           int             td_inhibitors;  /* (j) Why can not run. */
           int             td_pflags;      /* (k) Private thread (TDP_*) flags. */
           int             td_dupfd;       /* (k) Ret value from fdopen. XXX */
           void            *td_wchan;      /* (j) Sleep address. */
           const char      *td_wmesg;      /* (j) Reason for sleep. */
           u_char          td_lastcpu;     /* (j) Last cpu we were on. */
           u_char          td_oncpu;       /* (j) Which cpu we are on. */
           volatile u_char td_owepreempt;  /* (k*) Preempt on last critical_exit */
           short           td_locks;       /* (k) Count of non-spin locks. */
           u_char          td_tsqueue;     /* (j) Turnstile queue blocked on. */
           signed char     td_sqqueue;     /* (j) Sleepqueue queue blocked on. */
           struct turnstile *td_blocked;   /* (j) Lock process is blocked on. */
           void            *td_ithd;       /* (n) Unused, kept to preserve ABI. */
           const char      *td_lockname;   /* (j) Name of lock blocked on. */
           LIST_HEAD(, turnstile) td_contested;    /* (q) Contested locks. */
           struct lock_list_entry *td_sleeplocks; /* (k) Held sleep locks. */
           int             td_intr_nesting_level; /* (k) Interrupt recursion. */
           int             td_pinned;      /* (k) Temporary cpu pin count. */
           struct kse_thr_mailbox *td_mailbox; /* (*) Userland mailbox address. */
           struct ucred    *td_ucred;      /* (k) Reference to credentials. */
           struct thread   *td_standin;    /* (k + a) Use this for an upcall. */
           struct kse_upcall *td_upcall;   /* (k + j) Upcall structure. */
           u_int64_t       td_sticks;      /* (k) Statclock hits in system mode. */
           u_int           td_uuticks;     /* (k) Statclock hits (usr), for UTS. */
           u_int           td_usticks;     /* (k) Statclock hits (sys), for UTS. */
           int             td_intrval;     /* (j) Return value of TDF_INTERRUPT. */
           sigset_t        td_oldsigmask;  /* (k) Saved mask from pre sigpause. */
           sigset_t        td_sigmask;     /* (c) Current signal mask. */
           sigset_t        td_siglist;     /* (c) Sigs arrived, not delivered. */
           volatile u_int  td_generation;  /* (k) For detection of preemption */
           stack_t         td_sigstk;      /* (k) Stack ptr and on-stack flag. */
           int             td_kflags;      /* (c) Flags for KSE threading. */
           int             td_xsig;        /* (c) Signal for ptrace */
           u_long          td_profil_addr; /* (k) Temporary addr until AST. */
           u_int           td_profil_ticks; /* (k) Temporary ticks until AST. */
   #define td_endzero td_base_pri
   
   /* Copied during fork1() or thread_sched_upcall(). */
   #define td_startcopy td_endzero
           u_char          td_base_pri;    /* (j) Thread base kernel priority. */
           u_char          td_priority;    /* (j) Thread active priority. */
   #define td_endcopy td_pcb
   
   /*
    * Fields that must be manually set in fork1() or thread_sched_upcall()
    * or already have been set in the allocator, constructor, etc.
    */
           struct pcb      *td_pcb;        /* (k) Kernel VA of pcb and kstack. */
           enum {
                   TDS_INACTIVE = 0x0,
                   TDS_INHIBITED,
                   TDS_CAN_RUN,
                   TDS_RUNQ,
                   TDS_RUNNING
           } td_state;
           register_t      td_retval[2];   /* (k) Syscall aux returns. */
           struct callout  td_slpcallout;  /* (h) Callout for sleep. */
           struct trapframe *td_frame;     /* (k) */
           struct vm_object *td_kstack_obj;/* (a) Kstack object. */
           vm_offset_t     td_kstack;      /* (a) Kernel VA of kstack. */
           int             td_kstack_pages; /* (a) Size of the kstack. */
           struct vm_object *td_altkstack_obj;/* (a) Alternate kstack object. */
           vm_offset_t     td_altkstack;   /* (a) Kernel VA of alternate kstack. */
           int             td_altkstack_pages; /* (a) Size of alternate kstack. */
           volatile u_int  td_critnest;    /* (k*) Critical section nest level. */
           struct mdthread td_md;          /* (k) Any machine-dependent fields. */
           struct td_sched *td_sched;      /* (*) Scheduler-specific data. */
           struct kaudit_record    *td_ar; /* (k) Active audit record, if any. */
   } __attribute__ ((aligned (THREAD_ALIGN)));
   
   /*
    * Flags kept in td_flags:
    * To change these you MUST have the scheduler lock.
    */
   #define TDF_BORROWING   0x00000001 /* Thread is borrowing pri from another. */
   #define TDF_INPANIC     0x00000002 /* Caused a panic, let it drive crashdump. */
   #define TDF_SINTR       0x00000008 /* Sleep is interruptible. */
   #define TDF_TIMEOUT     0x00000010 /* Timing out during sleep. */
   #define TDF_IDLETD      0x00000020 /* This is a per-CPU idle thread. */
   #define TDF_SELECT      0x00000040 /* Selecting; wakeup/waiting danger. */
   #define TDF_SLEEPABORT  0x00000080 /* sleepq_abort was called. */
   #define TDF_TSNOBLOCK   0x00000100 /* Don't block on a turnstile due to race. */
   #define TDF_UNUSED9     0x00000200 /* --available -- */
   #define TDF_BOUNDARY    0x00000400 /* Thread suspended at user boundary */
   #define TDF_ASTPENDING  0x00000800 /* Thread has some asynchronous events. */
   #define TDF_TIMOFAIL    0x00001000 /* Timeout from sleep after we were awake. */
   #define TDF_INTERRUPT   0x00002000 /* Thread is marked as interrupted. */
   #define TDF_UNUSED14    0x00004000 /* --available -- */
   #define TDF_UNUSED15    0x00008000 /* --available -- */
   #define TDF_NEEDRESCHED 0x00010000 /* Thread needs to yield. */
   #define TDF_NEEDSIGCHK  0x00020000 /* Thread may need signal delivery. */
   #define TDF_XSIG        0x00040000 /* Thread is exchanging signal under trace */
   #define TDF_UMTXQ       0x00080000 /* Thread is sleeping on a umtx. */
   #define TDF_THRWAKEUP   0x00100000 /* Libthr thread must not suspend itself. */
   #define TDF_DBSUSPEND   0x00200000 /* Thread is suspended by debugger */
   #define TDF_UNUSED22    0x00400000 /* --available -- */
   #define TDF_UNUSED23    0x00800000 /* --available -- */
   #define TDF_SCHED0      0x01000000 /* Reserved for scheduler private use */
   #define TDF_SCHED1      0x02000000 /* Reserved for scheduler private use */
   #define TDF_SCHED2      0x04000000 /* Reserved for scheduler private use */
   #define TDF_SCHED3      0x08000000 /* Reserved for scheduler private use */
   
   /*
    * "Private" flags kept in td_pflags:
    * These are only accessed by curthread and thus need no locking.
    */
   #define TDP_OLDMASK     0x00000001 /* Need to restore mask after suspend. */
   #define TDP_INKTR       0x00000002 /* Thread is currently in KTR code. */
   #define TDP_INKTRACE    0x00000004 /* Thread is currently in KTRACE code. */
   #define TDP_UPCALLING   0x00000008 /* This thread is doing an upcall. */
   #define TDP_COWINPROGRESS 0x00000010 /* Snapshot copy-on-write in progress. */
   #define TDP_ALTSTACK    0x00000020 /* Have alternate signal stack. */
   #define TDP_DEADLKTREAT 0x00000040 /* Lock aquisition - deadlock treatment. */
   #define TDP_SA          0x00000080 /* A scheduler activation based thread. */
   #define TDP_NOSLEEPING  0x00000100 /* Thread is not allowed to sleep on a sq. */
   #define TDP_OWEUPC      0x00000200 /* Call addupc() at next AST. */
   #define TDP_ITHREAD     0x00000400 /* Thread is an interrupt thread. */
   #define TDP_CAN_UNBIND  0x00000800 /* Only temporarily bound. */
   #define TDP_SCHED1      0x00001000 /* Reserved for scheduler private use */
   #define TDP_SCHED2      0x00002000 /* Reserved for scheduler private use */
   #define TDP_SCHED3      0x00004000 /* Reserved for scheduler private use */
   #define TDP_SCHED4      0x00008000 /* Reserved for scheduler private use */
   #define TDP_GEOM        0x00010000 /* Settle GEOM before finishing syscall */
   #define TDP_SOFTDEP     0x00020000 /* Stuck processing softdep worklist */
   #define TDP_NORUNNINGBUF 0x00040000 /* Ignore runningbufspace check */
   #define TDP_INBDFLUSH   0x00100000 /* Already in BO_BDFLUSH, do not recurse */
   
   /*
    * Reasons that the current thread can not be run yet.
    * More than one may apply.
    */
   #define TDI_SUSPENDED   0x0001  /* On suspension queue. */
   #define TDI_SLEEPING    0x0002  /* Actually asleep! (tricky). */
   #define TDI_SWAPPED     0x0004  /* Stack not in mem.  Bad juju if run. */
   #define TDI_LOCK        0x0008  /* Stopped on a lock. */
   #define TDI_IWAIT       0x0010  /* Awaiting interrupt. */
   
   /*
    * flags (in kflags) related to M:N threading.
    */
   #define TDK_KSEREL      0x0001  /* Blocked in msleep on kg->kg_completed. */
   #define TDK_KSERELSIG   0x0002  /* Blocked in msleep on p->p_siglist. */
   #define TDK_WAKEUP      0x0004  /* Thread has been woken by kse_wakeup. */
   
   #define TD_CAN_UNBIND(td)                       \
       (((td)->td_pflags & TDP_CAN_UNBIND) &&      \
        ((td)->td_upcall != NULL))
   
   #define TD_IS_SLEEPING(td)      ((td)->td_inhibitors & TDI_SLEEPING)
   #define TD_ON_SLEEPQ(td)        ((td)->td_wchan != NULL)
   #define TD_IS_SUSPENDED(td)     ((td)->td_inhibitors & TDI_SUSPENDED)
   #define TD_IS_SWAPPED(td)       ((td)->td_inhibitors & TDI_SWAPPED)
   #define TD_ON_LOCK(td)          ((td)->td_inhibitors & TDI_LOCK)
   #define TD_AWAITING_INTR(td)    ((td)->td_inhibitors & TDI_IWAIT)
   #define TD_IS_RUNNING(td)       ((td)->td_state == TDS_RUNNING)
   #define TD_ON_RUNQ(td)          ((td)->td_state == TDS_RUNQ)
   #define TD_CAN_RUN(td)          ((td)->td_state == TDS_CAN_RUN)
   #define TD_IS_INHIBITED(td)     ((td)->td_state == TDS_INHIBITED)
   
   #define TD_SET_INHIB(td, inhib) do {                    \
           (td)->td_state = TDS_INHIBITED;                 \
           (td)->td_inhibitors |= (inhib);                 \
   } while (0)
   
   #define TD_CLR_INHIB(td, inhib) do {                    \
           if (((td)->td_inhibitors & (inhib)) &&          \
               (((td)->td_inhibitors &= ~(inhib)) == 0))   \
                   (td)->td_state = TDS_CAN_RUN;           \
   } while (0)
   
   #define TD_SET_SLEEPING(td)     TD_SET_INHIB((td), TDI_SLEEPING)
   #define TD_SET_SWAPPED(td)      TD_SET_INHIB((td), TDI_SWAPPED)
   #define TD_SET_LOCK(td)         TD_SET_INHIB((td), TDI_LOCK)
   #define TD_SET_SUSPENDED(td)    TD_SET_INHIB((td), TDI_SUSPENDED)
   #define TD_SET_IWAIT(td)        TD_SET_INHIB((td), TDI_IWAIT)
   #define TD_SET_EXITING(td)      TD_SET_INHIB((td), TDI_EXITING)
   
   #define TD_CLR_SLEEPING(td)     TD_CLR_INHIB((td), TDI_SLEEPING)
   #define TD_CLR_SWAPPED(td)      TD_CLR_INHIB((td), TDI_SWAPPED)
   #define TD_CLR_LOCK(td)         TD_CLR_INHIB((td), TDI_LOCK)
   #define TD_CLR_SUSPENDED(td)    TD_CLR_INHIB((td), TDI_SUSPENDED)
   #define TD_CLR_IWAIT(td)        TD_CLR_INHIB((td), TDI_IWAIT)
   
   #define TD_SET_RUNNING(td)      (td)->td_state = TDS_RUNNING
   #define TD_SET_RUNQ(td)         (td)->td_state = TDS_RUNQ
   #define TD_SET_CAN_RUN(td)      (td)->td_state = TDS_CAN_RUN
   
   /*
    * An upcall is used when returning to userland.  If a thread does not have
    * an upcall on return to userland the thread exports its context and exits.
    */
   struct kse_upcall {
           TAILQ_ENTRY(kse_upcall) ku_link;        /* List of upcalls in KSEG. */
           struct ksegrp           *ku_ksegrp;     /* Associated KSEG. */
           struct thread           *ku_owner;      /* Owning thread. */
           int                     ku_flags;       /* KUF_* flags. */
           struct kse_mailbox      *ku_mailbox;    /* Userland mailbox address. */
           stack_t                 ku_stack;       /* Userland upcall stack. */
           void                    *ku_func;       /* Userland upcall function. */
           unsigned int            ku_mflags;      /* Cached upcall mbox flags. */
   };
   
   #define KUF_DOUPCALL    0x00001         /* Do upcall now; don't wait. */
   #define KUF_EXITING     0x00002         /* Upcall structure is exiting. */
   
   /*
    * Kernel-scheduled entity group (KSEG).  The scheduler considers each KSEG to
    * be an indivisible unit from a time-sharing perspective, though each KSEG may
    * contain multiple KSEs.
    */
   struct ksegrp {
           struct proc     *kg_proc;       /* (*) Proc that contains this KSEG. */
           TAILQ_ENTRY(ksegrp) kg_ksegrp;  /* (*) Queue of KSEGs in kg_proc. */
           TAILQ_HEAD(, thread) kg_threads;/* (td_kglist) All threads. */
           TAILQ_HEAD(, thread) kg_runq;   /* (td_runq) waiting RUNNABLE threads */
           TAILQ_HEAD(, kse_upcall) kg_upcalls;    /* All upcalls in the group. */
   
   #define kg_startzero kg_estcpu
           u_int           kg_estcpu;      /* (j) Sum of the same field in KSEs. */
           u_int           kg_slptime;     /* (j) How long completely blocked. */
           int             kg_numupcalls;  /* (j) Num upcalls. */
           int             kg_upsleeps;    /* (c) Num threads in kse_release(). */
           struct kse_thr_mailbox *kg_completed; /* (c) Completed thread mboxes. */
           int             kg_nextupcall;  /* (n) Next upcall time. */
           int             kg_upquantum;   /* (n) Quantum to schedule an upcall. */
   #define kg_endzero kg_pri_class
   
   #define kg_startcopy    kg_endzero
           u_char          kg_pri_class;   /* (j) Scheduling class. */
           u_char          kg_user_pri;    /* (j) User pri from estcpu and nice. */
   #define kg_endcopy kg_numthreads
           int             kg_numthreads;  /* (j) Num threads in total. */
           struct kg_sched *kg_sched;      /* (*) Scheduler-specific data. */
   };
   
   /*
    * XXX: Does this belong in resource.h or resourcevar.h instead?
    * Resource usage extension.  The times in rusage structs in the kernel are
    * never up to date.  The actual times are kept as runtimes and tick counts
    * (with control info in the "previous" times), and are converted when
    * userland asks for rusage info.  Backwards compatibility prevents putting
    * this directly in the user-visible rusage struct.
    *
    * Locking: (cj) means (j) for p_rux and (c) for p_crux.
    */
   struct rusage_ext {
           struct bintime  rux_runtime;    /* (cj) Real time. */
           u_int64_t       rux_uticks;     /* (cj) Statclock hits in user mode. */
           u_int64_t       rux_sticks;     /* (cj) Statclock hits in sys mode. */
           u_int64_t       rux_iticks;     /* (cj) Statclock hits in intr mode. */
           u_int64_t       rux_uu;         /* (c) Previous user time in usec. */
           u_int64_t       rux_su;         /* (c) Previous sys time in usec. */
           u_int64_t       rux_iu;         /* (c) Previous intr time in usec. */
   };
   
   /*
    * The old fashionned process. May have multiple threads, KSEGRPs
    * and KSEs. Starts off with a single embedded KSEGRP and THREAD.
    */
   struct proc {
           LIST_ENTRY(proc) p_list;        /* (d) List of all processes. */
           TAILQ_HEAD(, ksegrp) p_ksegrps; /* (c)(kg_ksegrp) All KSEGs. */
           TAILQ_HEAD(, thread) p_threads; /* (j)(td_plist) Threads. (shortcut) */
           TAILQ_HEAD(, thread) p_suspended; /* (td_runq) Suspended threads. */
           struct ucred    *p_ucred;       /* (c) Process owner's identity. */
           struct filedesc *p_fd;          /* (b) Open files. */
           struct filedesc_to_leader *p_fdtol; /* (b) Tracking node */
                                           /* Accumulated stats for all threads? */
           struct pstats   *p_stats;       /* (b) Accounting/statistics (CPU). */
           struct plimit   *p_limit;       /* (c) Process limits. */
           struct sigacts  *p_sigacts;     /* (x) Signal actions, state (CPU). */
   
           /*
            * The following don't make too much sense.
            * See the td_ or ke_ versions of the same flags.
            */
           int             p_flag;         /* (c) P_* flags. */
           int             p_sflag;        /* (j) PS_* flags. */
           enum {
                   PRS_NEW = 0,            /* In creation */
                   PRS_NORMAL,             /* threads can be run. */
                   PRS_ZOMBIE
           } p_state;                      /* (j/c) S* process status. */
   
           pid_t           p_pid;          /* (b) Process identifier. */
           LIST_ENTRY(proc) p_hash;        /* (d) Hash chain. */
           LIST_ENTRY(proc) p_pglist;      /* (g + e) List of processes in pgrp. */
           struct proc     *p_pptr;        /* (c + e) Pointer to parent process. */
           LIST_ENTRY(proc) p_sibling;     /* (e) List of sibling processes. */
           LIST_HEAD(, proc) p_children;   /* (e) Pointer to list of children. */
           struct mtx      p_mtx;          /* (n) Lock for this struct. */
   
   /* The following fields are all zeroed upon creation in fork. */
   #define p_startzero     p_oppid
           pid_t           p_oppid;        /* (c + e) Save ppid in ptrace. XXX */
           struct vmspace  *p_vmspace;     /* (b) Address space. */
           u_int           p_swtime;       /* (j) Time swapped in or out. */
           struct itimerval p_realtimer;   /* (c) Alarm timer. */
           struct rusage_ext p_rux;        /* (cj) Internal resource usage. */
           struct rusage_ext p_crux;       /* (c) Internal child resource usage. */
           int             p_profthreads;  /* (c) Num threads in addupc_task. */
           int             p_maxthrwaits;  /* (c) Max threads num waiters */
           int             p_traceflag;    /* (o) Kernel trace points. */
           struct vnode    *p_tracevp;     /* (c + o) Trace to vnode. */
           struct ucred    *p_tracecred;   /* (o) Credentials to trace with. */
           struct vnode    *p_textvp;      /* (b) Vnode of executable. */
           sigset_t        p_siglist;      /* (c) Sigs not delivered to a td. */
           char            p_lock;         /* (c) Proclock (prevent swap) count. */
           struct sigiolst p_sigiolst;     /* (c) List of sigio sources. */
           int             p_sigparent;    /* (c) Signal to parent on exit. */
           int             p_sig;          /* (n) For core dump/debugger XXX. */
           u_long          p_code;         /* (n) For core dump/debugger XXX. */
           u_int           p_stops;        /* (c) Stop event bitmask. */
           u_int           p_stype;        /* (c) Stop event type. */
           char            p_step;         /* (c) Process is stopped. */
           u_char          p_pfsflags;     /* (c) Procfs flags. */
           struct nlminfo  *p_nlminfo;     /* (?) Only used by/for lockd. */
           struct kaioinfo *p_aioinfo;     /* (c) ASYNC I/O info. */
           struct thread   *p_singlethread;/* (c + j) If single threading this is it */
           int             p_suspcount;    /* (c) Num threads in suspended mode. */
           struct thread   *p_xthread;     /* (c) Trap thread */
           int             p_boundary_count;/* (c) Num threads at user boundary */
           struct ksegrp   *p_procscopegrp;
   /* End area that is zeroed on creation. */
   #define p_endzero       p_magic
   
   /* The following fields are all copied upon creation in fork. */
   #define p_startcopy     p_endzero
           u_int           p_magic;        /* (b) Magic number. */
           char            p_comm[MAXCOMLEN + 1];  /* (b) Process name. */
           struct pgrp     *p_pgrp;        /* (c + e) Pointer to process group. */
           struct sysentvec *p_sysent;     /* (b) Syscall dispatch info. */
           struct pargs    *p_args;        /* (c) Process arguments. */
           rlim_t          p_cpulimit;     /* (j) Current CPU limit in seconds. */
           signed char     p_nice;         /* (c + j) Process "nice" value. */
   /* End area that is copied on creation. */
   #define p_endcopy       p_xstat
   
           u_short         p_xstat;        /* (c) Exit status; also stop sig. */
           struct knlist   p_klist;        /* (c) Knotes attached to this proc. */
           int             p_numthreads;   /* (j) Number of threads. */
           int             p_numksegrps;   /* (c) Number of ksegrps. */
           struct mdproc   p_md;           /* Any machine-dependent fields. */
           struct callout  p_itcallout;    /* (h + c) Interval timer callout. */
           u_short         p_acflag;       /* (c) Accounting flags. */
           struct rusage   *p_ru;          /* (a) Exit information. XXX */
           struct proc     *p_peers;       /* (r) */
           struct proc     *p_leader;      /* (b) */
           void            *p_emuldata;    /* (c) Emulator state data. */
           struct label    *p_label;       /* (*) Proc (not subject) MAC label. */
           struct p_sched  *p_sched;       /* (*) Scheduler-specific data. */
           struct auditinfo_addr   *p_au;  /* (c) Process audit properties. */
           STAILQ_HEAD(, ktr_request)      p_ktr;  /* (o) KTR event queue. */
   };
   
   #define p_session       p_pgrp->pg_session
   #define p_pgid          p_pgrp->pg_id
   
   #define NOCPU   0xff            /* For when we aren't on a CPU. */
   
   
   /* These flags are kept in p_flag. */
   #define P_ADVLOCK       0x00001 /* Process may hold a POSIX advisory lock. */
   #define P_CONTROLT      0x00002 /* Has a controlling terminal. */
   #define P_KTHREAD       0x00004 /* Kernel thread (*). */
   #define P_NOLOAD        0x00008 /* Ignore during load avg calculations. */
   #define P_PPWAIT        0x00010 /* Parent is waiting for child to exec/exit. */
   #define P_PROFIL        0x00020 /* Has started profiling. */
   #define P_STOPPROF      0x00040 /* Has thread requesting to stop profiling. */
   #define P_HADTHREADS    0x00080 /* Has had threads (no cleanup shortcuts) */
   #define P_SUGID         0x00100 /* Had set id privileges since last exec. */
   #define P_SYSTEM        0x00200 /* System proc: no sigs, stats or swapping. */
   #define P_SINGLE_EXIT   0x00400 /* Threads suspending should exit, not wait. */
   #define P_TRACED        0x00800 /* Debugged process being traced. */
   #define P_WAITED        0x01000 /* Someone is waiting for us. */
   #define P_WEXIT         0x02000 /* Working on exiting. */
   #define P_EXEC          0x04000 /* Process called exec. */
   #define P_SA            0x08000 /* Using scheduler activations. */
   #define P_CONTINUED     0x10000 /* Proc has continued from a stopped state. */
   #define P_STOPPED_SIG   0x20000 /* Stopped due to SIGSTOP/SIGTSTP. */
   #define P_STOPPED_TRACE 0x40000 /* Stopped because of tracing. */
   #define P_STOPPED_SINGLE 0x80000 /* Only 1 thread can continue (not to user). */
   #define P_PROTECTED     0x100000 /* Do not kill on memory overcommit. */
   #define P_SIGEVENT      0x200000 /* Process pending signals changed. */
   #define P_SINGLE_BOUNDARY 0x400000 /* Threads should suspend at user boundary. */
   #define P_HWPMC         0x800000 /* Process is using HWPMCs */
   
   #define P_JAILED        0x1000000 /* Process is in jail. */
   #define P_WKILLED       0x2000000 /* Killed, go to kernel/user boundary ASAP. */
   #define P_INEXEC        0x4000000 /* Process is in execve(). */
   #define P_STATCHILD     0x8000000 /* Child process stopped or exited. */
   
   #define P_STOPPED       (P_STOPPED_SIG|P_STOPPED_SINGLE|P_STOPPED_TRACE)
   #define P_SHOULDSTOP(p) ((p)->p_flag & P_STOPPED)
   #define P_KILLED(p)     ((p)->p_flag & P_WKILLED)
   
   /* These flags are kept in p_sflag and are protected with sched_lock. */
   #define PS_INMEM        0x00001 /* Loaded into memory. */
   #define PS_XCPU         0x00002 /* Exceeded CPU limit. */
   #define PS_ALRMPEND     0x00020 /* Pending SIGVTALRM needs to be posted. */
   #define PS_PROFPEND     0x00040 /* Pending SIGPROF needs to be posted. */
   #define PS_SWAPINREQ    0x00100 /* Swapin request due to wakeup. */
   #define PS_SWAPPINGOUT  0x00200 /* Process is being swapped out. */
   #define PS_SWAPPINGIN   0x04000 /* Process is being swapped in. */
   #define PS_MACPEND      0x08000 /* AST-based MAC event pending. */
   
   /*
    * These were process status values (p_stat), now they are only used in
    * legacy conversion code.
    */
   #define SIDL    1               /* Process being created by fork. */
   #define SRUN    2               /* Currently runnable. */
   #define SSLEEP  3               /* Sleeping on an address. */
   #define SSTOP   4               /* Process debugging or suspension. */
   #define SZOMB   5               /* Awaiting collection by parent. */
   #define SWAIT   6               /* Waiting for interrupt. */
   #define SLOCK   7               /* Blocked on a lock. */
   
   #define P_MAGIC         0xbeefface
   
   #ifdef _KERNEL
   
   /* Flags for mi_switch(). */
   #define SW_VOL          0x0001          /* Voluntary switch. */
   #define SW_INVOL        0x0002          /* Involuntary switch. */
   #define SW_PREEMPT      0x0004          /* The invol switch is a preemption */
   
   /* Flags for setrunqueue().  Why are we setting this thread on the run queue? */
   #define SRQ_BORING      0x0000          /* No special circumstances. */
   #define SRQ_YIELDING    0x0001          /* We are yielding (from mi_switch). */
   #define SRQ_OURSELF     0x0002          /* It is ourself (from mi_switch). */
   #define SRQ_INTR        0x0004          /* It is probably urgent. */
   #define SRQ_PREEMPTED   0x0008          /* has been preempted.. be kind */
   
   /* How values for thread_single(). */
   #define SINGLE_NO_EXIT  0
   #define SINGLE_EXIT     1
   #define SINGLE_BOUNDARY 2
   
   /* XXXKSE: Missing values for thread_suspsend_check(). */
   
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_PARGS);
   MALLOC_DECLARE(M_PGRP);
   MALLOC_DECLARE(M_SESSION);
   MALLOC_DECLARE(M_SUBPROC);
   MALLOC_DECLARE(M_ZOMBIE);
   #endif
   
   #define FOREACH_PROC_IN_SYSTEM(p)                                       \
           LIST_FOREACH((p), &allproc, p_list)
   #define FOREACH_KSEGRP_IN_PROC(p, kg)                                   \
           TAILQ_FOREACH((kg), &(p)->p_ksegrps, kg_ksegrp)
   #define FOREACH_THREAD_IN_GROUP(kg, td)                                 \
           TAILQ_FOREACH((td), &(kg)->kg_threads, td_kglist)
   #define FOREACH_UPCALL_IN_GROUP(kg, ku)                                 \
           TAILQ_FOREACH((ku), &(kg)->kg_upcalls, ku_link)
   #define FOREACH_THREAD_IN_PROC(p, td)                                   \
           TAILQ_FOREACH((td), &(p)->p_threads, td_plist)
   
   /* XXXKSE the following lines should probably only be used in 1:1 code: */
   #define FIRST_THREAD_IN_PROC(p) TAILQ_FIRST(&(p)->p_threads)
   #define FIRST_KSEGRP_IN_PROC(p) TAILQ_FIRST(&(p)->p_ksegrps)
   
   /*
    * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
    * as it is used to represent "no process group".
    */
   #define PID_MAX         99999
   #define NO_PID          100000
   
   #define SESS_LEADER(p)  ((p)->p_session->s_leader == (p))
   #define SESSHOLD(s)     ((s)->s_count++)
   #define SESSRELE(s)     sessrele(s)
   
   
   #define STOPEVENT(p, e, v) do {                                         \
           if ((p)->p_stops & (e)) {                                       \
                   PROC_LOCK(p);                                           \
                   stopevent((p), (e), (v));                               \
                   PROC_UNLOCK(p);                                         \
           }                                                               \
   } while (0)
   #define _STOPEVENT(p, e, v) do {                                        \
           PROC_LOCK_ASSERT(p, MA_OWNED);                                  \
           WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, &p->p_mtx.mtx_object, \
               "checking stopevent %d", (e));                              \
           if ((p)->p_stops & (e))                                         \
                   stopevent((p), (e), (v));                               \
   } while (0)
   
   /* Lock and unlock a process. */
   #define PROC_LOCK(p)    mtx_lock(&(p)->p_mtx)
   #define PROC_TRYLOCK(p) mtx_trylock(&(p)->p_mtx)
   #define PROC_UNLOCK(p)  mtx_unlock(&(p)->p_mtx)
   #define PROC_LOCKED(p)  mtx_owned(&(p)->p_mtx)
   #define PROC_LOCK_ASSERT(p, type)       mtx_assert(&(p)->p_mtx, (type))
   
   /* Lock and unlock a process group. */
   #define PGRP_LOCK(pg)   mtx_lock(&(pg)->pg_mtx)
   #define PGRP_UNLOCK(pg) mtx_unlock(&(pg)->pg_mtx)
   #define PGRP_LOCKED(pg) mtx_owned(&(pg)->pg_mtx)
   #define PGRP_LOCK_ASSERT(pg, type)      mtx_assert(&(pg)->pg_mtx, (type))
   
   #define PGRP_LOCK_PGSIGNAL(pg) do {                                     \
           if ((pg) != NULL)                                               \
                   PGRP_LOCK(pg);                                          \
   } while (0)
   #define PGRP_UNLOCK_PGSIGNAL(pg) do {                                   \
           if ((pg) != NULL)                                               \
                   PGRP_UNLOCK(pg);                                        \
   } while (0)
   
   /* Lock and unlock a session. */
   #define SESS_LOCK(s)    mtx_lock(&(s)->s_mtx)
   #define SESS_UNLOCK(s)  mtx_unlock(&(s)->s_mtx)
   #define SESS_LOCKED(s)  mtx_owned(&(s)->s_mtx)
   #define SESS_LOCK_ASSERT(s, type)       mtx_assert(&(s)->s_mtx, (type))
   
   /* Hold process U-area in memory, normally for ptrace/procfs work. */
   #define PHOLD(p) do {                                                   \
           PROC_LOCK(p);                                                   \
           _PHOLD(p);                                                      \
           PROC_UNLOCK(p);                                                 \
   } while (0)
   #define _PHOLD(p) do {                                                  \
           PROC_LOCK_ASSERT((p), MA_OWNED);                                \
           KASSERT(!((p)->p_flag & P_WEXIT) || (p) == curproc,             \
               ("PHOLD of exiting process"));                              \
           (p)->p_lock++;                                                  \
           if (((p)->p_sflag & PS_INMEM) == 0)                             \
                   faultin((p));                                           \
   } while (0)
   #define PROC_ASSERT_HELD(p) do {                                        \
           KASSERT((p)->p_lock > 0, ("process not held"));                 \
   } while (0)
   
   #define PRELE(p) do {                                                   \
           PROC_LOCK((p));                                                 \
           _PRELE((p));                                                    \
           PROC_UNLOCK((p));                                               \
   } while (0)
   #define _PRELE(p) do {                                                  \
           PROC_LOCK_ASSERT((p), MA_OWNED);                                \
           (--(p)->p_lock);                                                \
           if (((p)->p_flag & P_WEXIT) && (p)->p_lock == 0)                \
                   wakeup(&(p)->p_lock);                                   \
   } while (0)
   #define PROC_ASSERT_NOT_HELD(p) do {                                    \
           KASSERT((p)->p_lock == 0, ("process held"));                    \
   } while (0)
   
   /* Check whether a thread is safe to be swapped out. */
   #define thread_safetoswapout(td) (TD_IS_SLEEPING(td) || TD_IS_SUSPENDED(td))
   
   /* Control whether or not it is safe for curthread to sleep. */
   #define THREAD_NO_SLEEPING() do {                                       \
           KASSERT(!(curthread->td_pflags & TDP_NOSLEEPING),               \
               ("nested no sleeping"));                                    \
           curthread->td_pflags |= TDP_NOSLEEPING;                         \
   } while (0)
   
   #define THREAD_SLEEPING_OK() do {                                       \
           KASSERT((curthread->td_pflags & TDP_NOSLEEPING),                \
               ("nested sleeping ok"));                                    \
           curthread->td_pflags &= ~TDP_NOSLEEPING;                        \
   } while (0)
   
   /* Lock and unlock process arguments. */
   #define PARGS_LOCK(p)           mtx_lock(&pargs_ref_lock)
   #define PARGS_UNLOCK(p)         mtx_unlock(&pargs_ref_lock)
   
   #define PIDHASH(pid)    (&pidhashtbl[(pid) & pidhash])
   extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
   extern u_long pidhash;
   
   #define PGRPHASH(pgid)  (&pgrphashtbl[(pgid) & pgrphash])
   extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
   extern u_long pgrphash;
   
   extern struct sx allproc_lock;
   extern struct sx proctree_lock;
   extern struct mtx pargs_ref_lock;
   extern struct mtx ppeers_lock;
   extern struct ksegrp ksegrp0;           /* Primary ksegrp in proc0. */
   extern struct proc proc0;               /* Process slot for swapper. */
   extern struct thread thread0;           /* Primary thread in proc0. */
   extern struct vmspace vmspace0;         /* VM space for proc0. */
   extern int hogticks;                    /* Limit on kernel cpu hogs. */
   extern int lastpid;
   extern int nprocs, maxproc;             /* Current and max number of procs. */
   extern int maxprocperuid;               /* Max procs per uid. */
   extern u_long ps_arg_cache_limit;
   extern int sched_quantum;               /* Scheduling quantum in ticks. */
   
   LIST_HEAD(proclist, proc);
   TAILQ_HEAD(procqueue, proc);
   TAILQ_HEAD(threadqueue, thread);
   extern struct proclist allproc;         /* List of all processes. */
   extern struct proclist zombproc;        /* List of zombie processes. */
   extern struct proc *initproc, *pageproc; /* Process slots for init, pager. */
   
   extern struct uma_zone *proc_zone;
   
   struct  proc *pfind(pid_t);             /* Find process by id. */
   struct  pgrp *pgfind(pid_t);            /* Find process group by id. */
   struct  proc *zpfind(pid_t);            /* Find zombie process by id. */
   
   void    adjustrunqueue(struct thread *, int newpri);
   void    ast(struct trapframe *framep);
   struct  thread *choosethread(void);
   int     cr_cansignal(struct ucred *cred, struct proc *proc, int signum);
   int     enterpgrp(struct proc *p, pid_t pgid, struct pgrp *pgrp,
               struct session *sess);
   int     enterthispgrp(struct proc *p, struct pgrp *pgrp);
   void    faultin(struct proc *p);
   void    fixjobc(struct proc *p, struct pgrp *pgrp, int entering);
   int     fork1(struct thread *, int, int, struct proc **);
   void    fork_exit(void (*)(void *, struct trapframe *), void *,
               struct trapframe *);
   void    fork_return(struct thread *, struct trapframe *);
   int     inferior(struct proc *p);
   void    kick_proc0(void);
   int     leavepgrp(struct proc *p);
   int     maybe_preempt(struct thread *td);
   void    mi_switch(int flags, struct thread *newtd);
   int     p_candebug(struct thread *td, struct proc *p);
   int     p_cansee(struct thread *td, struct proc *p);
   int     p_cansched(struct thread *td, struct proc *p);
   int     p_cansignal(struct thread *td, struct proc *p, int signum);
   int     p_canwait(struct thread *td, struct proc *p);
   struct  pargs *pargs_alloc(int len);
   void    pargs_drop(struct pargs *pa);
   void    pargs_free(struct pargs *pa);
   void    pargs_hold(struct pargs *pa);
   void    procinit(void);
   void    proc_linkup(struct proc *p, struct ksegrp *kg, struct thread *td);
   void    proc_reparent(struct proc *child, struct proc *newparent);
   struct  pstats *pstats_alloc(void);
   void    pstats_fork(struct pstats *src, struct pstats *dst);
   void    pstats_free(struct pstats *ps);
   int     securelevel_ge(struct ucred *cr, int level);
   int     securelevel_gt(struct ucred *cr, int level);
   void    sessrele(struct session *);
   void    setrunnable(struct thread *);
   void    setrunqueue(struct thread *, int flags);
   void    setsugid(struct proc *p);
   int     sigonstack(size_t sp);
   void    sleepinit(void);
   void    stopevent(struct proc *, u_int, u_int);
   void    threadinit(void);
   void    cpu_idle(void);
   extern  void (*cpu_idle_hook)(void);    /* Hook to machdep CPU idler. */
   void    cpu_switch(struct thread *old, struct thread *new);
   void    cpu_throw(struct thread *old, struct thread *new) __dead2;
   void    unsleep(struct thread *);
   void    userret(struct thread *, struct trapframe *, u_int);
   
   void    cpu_exit(struct thread *);
   void    exit1(struct thread *, int) __dead2;
   void    cpu_fork(struct thread *, struct proc *, struct thread *, int);
   void    cpu_set_fork_handler(struct thread *, void (*)(void *), void *);
   
   /* New in KSE. */
   struct  ksegrp *ksegrp_alloc(void);
   void    ksegrp_free(struct ksegrp *kg);
   void    ksegrp_stash(struct ksegrp *kg);
   void    kse_GC(void);
   void    kseinit(void);
   void    cpu_set_upcall(struct thread *td, struct thread *td0);
   void    cpu_set_upcall_kse(struct thread *, void (*)(void *), void *, stack_t *);
   int     cpu_set_user_tls(struct thread *, void *tls_base);
   void    cpu_thread_clean(struct thread *);
   void    cpu_thread_exit(struct thread *);
   void    cpu_thread_setup(struct thread *td);
   void    cpu_thread_siginfo(int sig, u_long code, siginfo_t *si);
   void    cpu_thread_swapin(struct thread *);
   void    cpu_thread_swapout(struct thread *);
   void    ksegrp_link(struct ksegrp *kg, struct proc *p);
   void    ksegrp_unlink(struct ksegrp *kg);
   struct  thread *thread_alloc(void);
   void    thread_continued(struct proc *p);
   void    thread_exit(void) __dead2;
   int     thread_export_context(struct thread *td, int willexit);
   void    thread_free(struct thread *td);
   void    thread_link(struct thread *td, struct ksegrp *kg);
   void    thread_reap(void);
   struct thread *thread_schedule_upcall(struct thread *td, struct kse_upcall *ku);
   void    thread_signal_add(struct thread *td, int sig);
   int     thread_single(int how);
   void    thread_single_end(void);
   int     thread_sleep_check(struct thread *td);
   void    thread_stash(struct thread *td);
   int     thread_statclock(int user);
   void    thread_stopped(struct proc *p);
   int     thread_suspend_check(int how);
   void    thread_suspend_one(struct thread *td);
   struct thread *thread_switchout(struct thread *td, int flags,
               struct thread *newtd);
   void    thread_unlink(struct thread *td);
   void    thread_unsuspend(struct proc *p);
   void    thread_unsuspend_one(struct thread *td);
   void    thread_unthread(struct thread *td);
   int     thread_userret(struct thread *td, struct trapframe *frame);
   void    thread_user_enter(struct thread *td);
   void    thread_wait(struct proc *p);
   void    thr_exit1(void);
   struct kse_upcall *upcall_alloc(void);
   void    upcall_free(struct kse_upcall *ku);
   void    upcall_link(struct kse_upcall *ku, struct ksegrp *kg);
   void    upcall_unlink(struct kse_upcall *ku);
   void    upcall_remove(struct thread *td);
   void    upcall_stash(struct kse_upcall *ke);
   
   #endif  /* _KERNEL */
   
   #endif  /* !_SYS_PROC_H_ */

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