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

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

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