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

     /*
      * SYS/THREAD.H
      *
      *      Implements the architecture independant portion of the LWKT 
      *      subsystem.
      *
      * Types which must already be defined when this header is included by
      * userland:    struct md_thread
      */
    
    #ifndef _SYS_THREAD_H_
    #define _SYS_THREAD_H_
    
    #ifndef _SYS_STDINT_H_
    #include <sys/stdint.h>         /* __int types */
    #endif
    #ifndef _SYS_PARAM_H_
    #include <sys/param.h>          /* MAXCOMLEN */
    #endif
    #ifndef _SYS_QUEUE_H_
    #include <sys/queue.h>          /* TAILQ_* macros */
    #endif
    #ifndef _SYS_MSGPORT_H_
    #include <sys/msgport.h>        /* lwkt_port */
    #endif
    #ifndef _SYS_TIME_H_
    #include <sys/time.h>           /* struct timeval */
    #endif
    #ifndef _SYS_LOCK_H
    #include <sys/lock.h>
    #endif
    #ifndef _SYS_SPINLOCK_H_
    #include <sys/spinlock.h>
    #endif
    #ifndef _SYS_IOSCHED_H_
    #include <sys/iosched.h>
    #endif
    #include <machine/thread.h>
    
    struct globaldata;
    struct lwp;
    struct proc;
    struct thread;
    struct lwkt_queue;
    struct lwkt_token;
    struct lwkt_tokref;
    struct lwkt_ipiq;
    struct lwkt_cpu_msg;
    struct lwkt_cpu_port;
    struct lwkt_cpusync;
    union sysunion;
    
    typedef struct lwkt_queue       *lwkt_queue_t;
    typedef struct lwkt_token       *lwkt_token_t;
    typedef struct lwkt_tokref      *lwkt_tokref_t;
    typedef struct lwkt_cpu_msg     *lwkt_cpu_msg_t;
    typedef struct lwkt_cpu_port    *lwkt_cpu_port_t;
    typedef struct lwkt_ipiq        *lwkt_ipiq_t;
    typedef struct lwkt_cpusync     *lwkt_cpusync_t;
    typedef struct thread           *thread_t;
    
    typedef TAILQ_HEAD(lwkt_queue, thread) lwkt_queue;
    
    /*
     * Differentiation between kernel threads and user threads.  Userland
     * programs which want to access to kernel structures have to define
     * _KERNEL_STRUCTURES.  This is a kinda safety valve to prevent badly
     * written user programs from getting an LWKT thread that is neither the
     * kernel nor the user version.
     */
    #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
    #ifndef _MACHINE_THREAD_H_
    #include <machine/thread.h>             /* md_thread */
    #endif
    #ifndef _MACHINE_FRAME_H_
    #include <machine/frame.h>
    #endif
    #else
    struct intrframe;
    #endif
    
    /*
     * Tokens are used to serialize access to information.  They are 'soft'
     * serialization entities that only stay in effect while a thread is
     * running.  If the thread blocks, other threads can run holding the same
     * token(s).  The tokens are reacquired when the original thread resumes.
     *
     * A thread can depend on its serialization remaining intact through a
     * preemption.  An interrupt which attempts to use the same token as the
     * thread being preempted will reschedule itself for non-preemptive
     * operation, so the new token code is capable of interlocking against
     * interrupts as well as other cpus.  This means that your token can only
     * be (temporarily) lost if you *explicitly* block.
     *
     * Tokens are managed through a helper reference structure, lwkt_tokref.  Each
     * thread has a stack of tokref's to keep track of acquired tokens.  Multiple
     * tokref's may reference the same token.
     *
     * Tokens can be held shared or exclusive.   An exclusive holder is able
    * to set the TOK_EXCLUSIVE bit in t_count as long as no bit in the count
    * mask is set.  If unable to accomplish this TOK_EXCLREQ can be set instead
    * which prevents any new shared acquisitions while the exclusive requestor
    * spins in the scheduler.  A shared holder can bump t_count by the increment
    * value as long as neither TOK_EXCLUSIVE or TOK_EXCLREQ is set, else spin
    * in the scheduler.
    *
    * Multiple exclusive tokens are handled by treating the additional tokens
    * as a special case of the shared token, incrementing the count value.  This
    * reduces the complexity of the token release code.
    */
   
   typedef struct lwkt_token {
       long                t_count;        /* Shared/exclreq/exclusive access */
       struct lwkt_tokref  *t_ref;         /* Exclusive ref */
       long                t_collisions;   /* Collision counter */
       const char          *t_desc;        /* Descriptive name */
   } lwkt_token;
   
   #define TOK_EXCLUSIVE   0x00000001      /* Exclusive lock held */
   #define TOK_EXCLREQ     0x00000002      /* Exclusive request pending */
   #define TOK_INCR        4               /* Shared count increment */
   #define TOK_COUNTMASK   (~(long)(TOK_EXCLUSIVE|TOK_EXCLREQ))
   
   /*
    * Static initialization for a lwkt_token.
    */
   #define LWKT_TOKEN_INITIALIZER(name)    \
   {                                       \
           .t_count = 0,                   \
           .t_ref = NULL,                  \
           .t_collisions = 0,              \
           .t_desc = #name                 \
   }
   
   /*
    * Assert that a particular token is held
    */
   #define LWKT_TOKEN_HELD_ANY(tok)        _lwkt_token_held_any(tok, curthread)
   #define LWKT_TOKEN_HELD_EXCL(tok)       _lwkt_token_held_excl(tok, curthread)
   
   #define ASSERT_LWKT_TOKEN_HELD(tok)             \
           KKASSERT(LWKT_TOKEN_HELD_ANY(tok))
   
   #define ASSERT_LWKT_TOKEN_HELD_EXCL(tok)        \
           KKASSERT(LWKT_TOKEN_HELD_EXCL(tok))
   
   #define ASSERT_NO_TOKENS_HELD(td)       \
           KKASSERT((td)->td_toks_stop == &td->td_toks_array[0])
   
   /*
    * Assert that a particular token is held and we are in a hard
    * code execution section (interrupt, ipi, or hard code section).
    * Hard code sections are not allowed to block or potentially block.
    * e.g. lwkt_gettoken() would only be ok if the token were already
    * held.
    */
   #define ASSERT_LWKT_TOKEN_HARD(tok)                                     \
           do {                                                            \
                   globaldata_t zgd __debugvar = mycpu;                    \
                   KKASSERT((tok)->t_ref &&                                \
                            (tok)->t_ref->tr_owner == zgd->gd_curthread && \
                            zgd->gd_intr_nesting_level > 0);               \
           } while(0)
   
   /*
    * Assert that a particular token is held and we are in a normal
    * critical section.  Critical sections will not be preempted but
    * can explicitly block (tsleep, lwkt_gettoken, etc).
    */
   #define ASSERT_LWKT_TOKEN_CRIT(tok)                                     \
           do {                                                            \
                   globaldata_t zgd __debugvar = mycpu;                    \
                   KKASSERT((tok)->t_ref &&                                \
                            (tok)->t_ref->tr_owner == zgd->gd_curthread && \
                            zgd->gd_curthread->td_critcount > 0);          \
           } while(0)
   
   struct lwkt_tokref {
       lwkt_token_t        tr_tok;         /* token in question */
       long                tr_count;       /* TOK_EXCLUSIVE|TOK_EXCLREQ or 0 */
       struct thread       *tr_owner;      /* me */
   };
   
   #define MAXCPUFIFO      32      /* power of 2 */
   #define MAXCPUFIFO_MASK (MAXCPUFIFO - 1)
   #define LWKT_MAXTOKENS  32      /* max tokens beneficially held by thread */
   
   /*
    * Always cast to ipifunc_t when registering an ipi.  The actual ipi function
    * is called with both the data and an interrupt frame, but the ipi function
    * that is registered might only declare a data argument.
    */
   typedef void (*ipifunc1_t)(void *arg);
   typedef void (*ipifunc2_t)(void *arg, int arg2);
   typedef void (*ipifunc3_t)(void *arg, int arg2, struct intrframe *frame);
   
   typedef struct lwkt_ipiq {
       int         ip_rindex;      /* only written by target cpu */
       int         ip_xindex;      /* written by target, indicates completion */
       int         ip_windex;      /* only written by source cpu */
       struct {
           ipifunc3_t      func;
           void            *arg1;
           int             arg2;
           char            filler[32 - sizeof(int) - sizeof(void *) * 2];
       } ip_info[MAXCPUFIFO];
   } lwkt_ipiq;
   
   /*
    * CPU Synchronization structure.  See lwkt_cpusync_start() and
    * lwkt_cpusync_finish() for more information.
    */
   typedef void (*cpusync_func_t)(void *arg);
   
   struct lwkt_cpusync {
       cpumask_t   cs_mask;                /* cpus running the sync */
       cpumask_t   cs_mack;                /* mask acknowledge */
       cpusync_func_t cs_func;             /* function to execute */
       void        *cs_data;               /* function data */
   };
   
   /*
    * The standard message and queue structure used for communications between
    * cpus.  Messages are typically queued via a machine-specific non-linked
    * FIFO matrix allowing any cpu to send a message to any other cpu without
    * blocking.
    */
   typedef struct lwkt_cpu_msg {
       void        (*cm_func)(lwkt_cpu_msg_t msg); /* primary dispatch function */
       int         cm_code;                /* request code if applicable */
       int         cm_cpu;                 /* reply to cpu */
       thread_t    cm_originator;          /* originating thread for wakeup */
   } lwkt_cpu_msg;
   
   /*
    * Thread structure.  Note that ownership of a thread structure is special
    * cased and there is no 'token'.  A thread is always owned by the cpu
    * represented by td_gd, any manipulation of the thread by some other cpu
    * must be done through cpu_*msg() functions.  e.g. you could request
    * ownership of a thread that way, or hand a thread off to another cpu.
    *
    * NOTE: td_ucred is synchronized from the p_ucred on user->kernel syscall,
    *       trap, and AST/signal transitions to provide a stable ucred for
    *       (primarily) system calls.  This field will be NULL for pure kernel
    *       threads.
    */
   struct md_intr_info;
   
   struct thread {
       TAILQ_ENTRY(thread) td_threadq;
       TAILQ_ENTRY(thread) td_allq;
       TAILQ_ENTRY(thread) td_sleepq;
       lwkt_port   td_msgport;     /* built-in message port for replies */
       struct lwp  *td_lwp;        /* (optional) associated lwp */
       struct proc *td_proc;       /* (optional) associated process */
       struct pcb  *td_pcb;        /* points to pcb and top of kstack */
       struct globaldata *td_gd;   /* associated with this cpu */
       const char  *td_wmesg;      /* string name for blockage */
       const volatile void *td_wchan;      /* waiting on channel */
       int         td_pri;         /* 0-31, 31=highest priority (note 1) */
       int         td_critcount;   /* critical section priority */
       u_int       td_flags;       /* TDF flags */
       int         td_wdomain;     /* domain for wchan address (typ 0) */
       void        (*td_preemptable)(struct thread *td, int critcount);
       void        (*td_release)(struct thread *td);
       char        *td_kstack;     /* kernel stack */
       int         td_kstack_size; /* size of kernel stack */
       char        *td_sp;         /* kernel stack pointer for LWKT restore */
       thread_t    (*td_switch)(struct thread *ntd);
       __uint64_t  td_uticks;      /* Statclock hits in user mode (uS) */
       __uint64_t  td_sticks;      /* Statclock hits in system mode (uS) */
       __uint64_t  td_iticks;      /* Statclock hits processing intr (uS) */
       int         td_locks;       /* lockmgr lock debugging */
       void        *td_dsched_priv1;       /* priv data for I/O schedulers */
       int         td_refs;        /* hold position in gd_tdallq / hold free */
       int         td_nest_count;  /* prevent splz nesting */
       int         td_contended;   /* token contention count */
       u_int       td_mpflags;     /* flags can be set by foreign cpus */
       int         td_cscount;     /* cpu synchronization master */
       int         td_wakefromcpu; /* who woke me up? */
       int         td_upri;        /* user priority (sub-priority under td_pri) */
       int         td_type;        /* thread type, TD_TYPE_ */
       int         td_unused02[1]; /* for future fields */
       int         td_unused03[4]; /* for future fields */
       struct iosched_data td_iosdata;     /* Dynamic I/O scheduling data */
       struct timeval td_start;    /* start time for a thread/process */
       char        td_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
       struct thread *td_preempted; /* we preempted this thread */
       struct ucred *td_ucred;             /* synchronized from p_ucred */
       void         *td_vmm;       /* vmm private data */
       lwkt_tokref_t td_toks_have;         /* tokens we own */
       lwkt_tokref_t td_toks_stop;         /* tokens we want */
       struct lwkt_tokref td_toks_array[LWKT_MAXTOKENS];
       int         td_fairq_load;          /* fairq */
       int         td_fairq_count;         /* fairq */
       struct globaldata *td_migrate_gd;   /* target gd for thread migration */
   #ifdef DEBUG_CRIT_SECTIONS
   #define CRIT_DEBUG_ARRAY_SIZE   32
   #define CRIT_DEBUG_ARRAY_MASK   (CRIT_DEBUG_ARRAY_SIZE - 1)
       const char  *td_crit_debug_array[CRIT_DEBUG_ARRAY_SIZE];
       int         td_crit_debug_index;
       int         td_in_crit_report;      
   #endif
       struct md_thread td_mach;
   #ifdef DEBUG_LOCKS
   #define SPINLOCK_DEBUG_ARRAY_SIZE       32
      int  td_spinlock_stack_id[SPINLOCK_DEBUG_ARRAY_SIZE];
      struct spinlock *td_spinlock_stack[SPINLOCK_DEBUG_ARRAY_SIZE];
      void         *td_spinlock_caller_pc[SPINLOCK_DEBUG_ARRAY_SIZE];
   
       /*
        * Track lockmgr locks held; lk->lk_filename:lk->lk_lineno is the holder
        */
   #define LOCKMGR_DEBUG_ARRAY_SIZE        8
       int         td_lockmgr_stack_id[LOCKMGR_DEBUG_ARRAY_SIZE];
       struct lock *td_lockmgr_stack[LOCKMGR_DEBUG_ARRAY_SIZE];
   #endif
   };
   
   #define td_toks_base            td_toks_array[0]
   #define td_toks_end             td_toks_array[LWKT_MAXTOKENS]
   
   #define TD_TOKS_HELD(td)        ((td)->td_toks_stop != &(td)->td_toks_base)
   #define TD_TOKS_NOT_HELD(td)    ((td)->td_toks_stop == &(td)->td_toks_base)
   
   /*
    * Thread flags.  Note that TDF_RUNNING is cleared on the old thread after
    * we switch to the new one, which is necessary because LWKTs don't need
    * to hold the BGL.  This flag is used by the exit code and the managed
    * thread migration code.  Note in addition that preemption will cause
    * TDF_RUNNING to be cleared temporarily, so any code checking TDF_RUNNING
    * must also check TDF_PREEMPT_LOCK.
    *
    * LWKT threads stay on their (per-cpu) run queue while running, not to
    * be confused with user processes which are removed from the user scheduling
    * run queue while actually running.
    *
    * td_threadq can represent the thread on one of three queues... the LWKT
    * run queue, a tsleep queue, or an lwkt blocking queue.  The LWKT subsystem
    * does not allow a thread to be scheduled if it already resides on some
    * queue.
    */
   #define TDF_RUNNING             0x00000001      /* thread still active */
   #define TDF_RUNQ                0x00000002      /* on an LWKT run queue */
   #define TDF_PREEMPT_LOCK        0x00000004      /* I have been preempted */
   #define TDF_PREEMPT_DONE        0x00000008      /* ac preemption complete */
   #define TDF_NOSTART             0x00000010      /* do not schedule on create */
   #define TDF_MIGRATING           0x00000020      /* thread is being migrated */
   #define TDF_SINTR               0x00000040      /* interruptability for 'ps' */
   #define TDF_TSLEEPQ             0x00000080      /* on a tsleep wait queue */
   
   #define TDF_SYSTHREAD           0x00000100      /* reserve memory may be used */
   #define TDF_ALLOCATED_THREAD    0x00000200      /* objcache allocated thread */
   #define TDF_ALLOCATED_STACK     0x00000400      /* objcache allocated stack */
   #define TDF_VERBOSE             0x00000800      /* verbose on exit */
   #define TDF_DEADLKTREAT         0x00001000      /* special lockmgr treatment */
   #define TDF_MARKER              0x00002000      /* tdallq list scan marker */
   #define TDF_TIMEOUT_RUNNING     0x00004000      /* tsleep timeout race */
   #define TDF_TIMEOUT             0x00008000      /* tsleep timeout */
   #define TDF_INTTHREAD           0x00010000      /* interrupt thread */
   #define TDF_TSLEEP_DESCHEDULED  0x00020000      /* tsleep core deschedule */
   #define TDF_BLOCKED             0x00040000      /* Thread is blocked */
   #define TDF_PANICWARN           0x00080000      /* panic warning in switch */
   #define TDF_BLOCKQ              0x00100000      /* on block queue */
   #define TDF_FORCE_SPINPORT      0x00200000
   #define TDF_EXITING             0x00400000      /* thread exiting */
   #define TDF_USINGFP             0x00800000      /* thread using fp coproc */
   #define TDF_KERNELFP            0x01000000      /* kernel using fp coproc */
   #define TDF_DELAYED_WAKEUP      0x02000000
   #define TDF_FIXEDCPU            0x04000000      /* running cpu is fixed */
   #define TDF_USERMODE            0x08000000      /* in or entering user mode */
   #define TDF_NOFAULT             0x10000000      /* force onfault on fault */
   
   #define TDF_MP_STOPREQ          0x00000001      /* suspend_kproc */
   #define TDF_MP_WAKEREQ          0x00000002      /* resume_kproc */
   #define TDF_MP_EXITWAIT         0x00000004      /* reaper, see lwp_wait() */
   #define TDF_MP_EXITSIG          0x00000008      /* reaper, see lwp_wait() */
   #define TDF_MP_BATCH_DEMARC     0x00000010      /* batch mode handling */
   #define TDF_MP_DIDYIELD         0x00000020      /* effects scheduling */
   
   #define TD_TYPE_GENERIC         0               /* generic thread */
   #define TD_TYPE_CRYPTO          1               /* crypto thread */
   #define TD_TYPE_NETISR          2               /* netisr thread */
   
   /*
    * Thread priorities.  Typically only one thread from any given
    * user process scheduling queue is on the LWKT run queue at a time.
    * Remember that there is one LWKT run queue per cpu.
    *
    * Critical sections are handled by bumping td_pri above TDPRI_MAX, which
    * causes interrupts to be masked as they occur.  When this occurs a
    * rollup flag will be set in mycpu->gd_reqflags.
    */
   #define TDPRI_IDLE_THREAD       0       /* the idle thread */
   #define TDPRI_IDLE_WORK         1       /* idle work (page zero, etc) */
   #define TDPRI_USER_SCHEDULER    2       /* user scheduler helper */
   #define TDPRI_USER_IDLE         4       /* user scheduler idle */
   #define TDPRI_USER_NORM         6       /* user scheduler normal */
   #define TDPRI_USER_REAL         8       /* user scheduler real time */
   #define TDPRI_KERN_LPSCHED      9       /* scheduler helper for userland sch */
   #define TDPRI_KERN_USER         10      /* kernel / block in syscall */
   #define TDPRI_KERN_DAEMON       12      /* kernel daemon (pageout, etc) */
   #define TDPRI_SOFT_NORM         14      /* kernel / normal */
   #define TDPRI_SOFT_TIMER        16      /* kernel / timer */
   #define TDPRI_EXITING           19      /* exiting thread */
   #define TDPRI_INT_SUPPORT       20      /* kernel / high priority support */
   #define TDPRI_INT_LOW           27      /* low priority interrupt */
   #define TDPRI_INT_MED           28      /* medium priority interrupt */
   #define TDPRI_INT_HIGH          29      /* high priority interrupt */
   #define TDPRI_MAX               31
   
   #define LWKT_THREAD_STACK       (UPAGES * PAGE_SIZE)
   
   #define IN_CRITICAL_SECT(td)    ((td)->td_critcount)
   
   #ifdef _KERNEL
   
   /*
    * Global tokens
    */
   extern struct lwkt_token mp_token;
   extern struct lwkt_token pmap_token;
   extern struct lwkt_token dev_token;
   extern struct lwkt_token vm_token;
   extern struct lwkt_token vmspace_token;
   extern struct lwkt_token kvm_token;
   extern struct lwkt_token sigio_token;
   extern struct lwkt_token tty_token;
   extern struct lwkt_token vnode_token;
   extern struct lwkt_token ifnet_token;
   
   /*
    * Procedures
    */
   extern void lwkt_init(void);
   extern struct thread *lwkt_alloc_thread(struct thread *, int, int, int);
   extern void lwkt_init_thread(struct thread *, void *, int, int,
                                struct globaldata *);
   extern void lwkt_set_interrupt_support_thread(void);
   extern void lwkt_set_comm(thread_t, const char *, ...) __printflike(2, 3);
   extern void lwkt_free_thread(struct thread *);
   extern void lwkt_gdinit(struct globaldata *);
   extern void lwkt_switch(void);
   extern void lwkt_switch_return(struct thread *);
   extern void lwkt_preempt(thread_t, int);
   extern void lwkt_schedule(thread_t);
   extern void lwkt_schedule_noresched(thread_t);
   extern void lwkt_schedule_self(thread_t);
   extern void lwkt_deschedule(thread_t);
   extern void lwkt_deschedule_self(thread_t);
   extern void lwkt_yield(void);
   extern void lwkt_yield_quick(void);
   extern void lwkt_user_yield(void);
   extern void lwkt_hold(thread_t);
   extern void lwkt_rele(thread_t);
   extern void lwkt_passive_release(thread_t);
   extern void lwkt_maybe_splz(thread_t);
   
   extern void lwkt_gettoken(lwkt_token_t);
   extern void lwkt_gettoken_shared(lwkt_token_t);
   extern void lwkt_gettoken_hard(lwkt_token_t);
   extern int  lwkt_trytoken(lwkt_token_t);
   extern void lwkt_reltoken(lwkt_token_t);
   extern void lwkt_reltoken_hard(lwkt_token_t);
   extern int  lwkt_cnttoken(lwkt_token_t, thread_t);
   extern int  lwkt_getalltokens(thread_t, int);
   extern void lwkt_relalltokens(thread_t);
   extern void lwkt_token_init(lwkt_token_t, const char *);
   extern void lwkt_token_uninit(lwkt_token_t);
   
   extern void lwkt_token_pool_init(void);
   extern lwkt_token_t lwkt_token_pool_lookup(void *);
   extern lwkt_token_t lwkt_getpooltoken(void *);
   extern void lwkt_relpooltoken(void *);
   
   extern void lwkt_token_swap(void);
   
   extern void lwkt_setpri(thread_t, int);
   extern void lwkt_setpri_initial(thread_t, int);
   extern void lwkt_setpri_self(int);
   extern void lwkt_schedulerclock(thread_t td);
   extern void lwkt_setcpu_self(struct globaldata *);
   extern void lwkt_migratecpu(int);
   
   extern void lwkt_giveaway(struct thread *);
   extern void lwkt_acquire(struct thread *);
   extern int  lwkt_send_ipiq3(struct globaldata *, ipifunc3_t, void *, int);
   extern int  lwkt_send_ipiq3_passive(struct globaldata *, ipifunc3_t,
                                       void *, int);
   extern int  lwkt_send_ipiq3_nowait(struct globaldata *, ipifunc3_t,
                                      void *, int);
   extern int  lwkt_send_ipiq3_bycpu(int, ipifunc3_t, void *, int);
   extern int  lwkt_send_ipiq3_mask(cpumask_t, ipifunc3_t, void *, int);
   extern void lwkt_wait_ipiq(struct globaldata *, int);
   extern int  lwkt_seq_ipiq(struct globaldata *);
   extern void lwkt_process_ipiq(void);
   extern void lwkt_process_ipiq_frame(struct intrframe *);
   extern void lwkt_smp_stopped(void);
   extern void lwkt_synchronize_ipiqs(const char *);
   
   /* lwkt_cpusync_init() - inline function in sys/thread2.h */
   extern void lwkt_cpusync_simple(cpumask_t, cpusync_func_t, void *);
   extern void lwkt_cpusync_interlock(lwkt_cpusync_t);
   extern void lwkt_cpusync_deinterlock(lwkt_cpusync_t);
   
   extern void crit_panic(void) __dead2;
   extern struct lwp *lwkt_preempted_proc(void);
   
   extern int  lwkt_create (void (*func)(void *), void *, struct thread **,
                   struct thread *, int, int,
                   const char *, ...) __printflike(7, 8);
   extern void lwkt_exit (void) __dead2;
   extern void lwkt_remove_tdallq (struct thread *);
   
   #endif
   
   #endif
   

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