1/* $NetBSD: lwp.h,v 1.186 2019/06/19 21:39:53 kamil Exp $ */
2
3/*
4 * Copyright (c) 2001, 2006, 2007, 2008, 2009, 2010
5 * The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Nathan J. Williams and Andrew Doran.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#ifndef _SYS_LWP_H_
34#define _SYS_LWP_H_
35
36#if defined(_KERNEL) || defined(_KMEMUSER)
37
38#include <sys/param.h>
39#include <sys/time.h>
40#include <sys/queue.h>
41#include <sys/callout.h>
42#include <sys/kcpuset.h>
43#include <sys/mutex.h>
44#include <sys/condvar.h>
45#include <sys/signalvar.h>
46#include <sys/sched.h>
47#include <sys/specificdata.h>
48#include <sys/syncobj.h>
49#include <sys/resource.h>
50
51#if defined(_KERNEL)
52struct lwp;
53/* forward declare this for <machine/cpu.h> so it can get l_cpu. */
54static __inline struct cpu_info *lwp_getcpu(struct lwp *);
55#include <machine/cpu.h> /* curcpu() and cpu_info */
56#endif
57
58#include <machine/proc.h> /* Machine-dependent proc substruct. */
59
60/*
61 * Lightweight process. Field markings and the corresponding locks:
62 *
63 * a: proc_lock
64 * c: condition variable interlock, passed to cv_wait()
65 * l: *l_mutex
66 * p: l_proc->p_lock
67 * s: spc_mutex, which may or may not be referenced by l_mutex
68 * S: l_selcluster->sc_lock
69 * (: unlocked, stable
70 * !: unlocked, may only be reliably accessed by the LWP itself
71 *
72 * Fields are clustered together by usage (to increase the likelihood
73 * of cache hits) and by size (to reduce dead space in the structure).
74 */
75
76#include <sys/pcu.h>
77
78struct lockdebug;
79struct sysent;
80
81struct lwp {
82 /* Scheduling and overall state. */
83 TAILQ_ENTRY(lwp) l_runq; /* s: run queue */
84 union {
85 void * info; /* s: scheduler-specific structure */
86 u_int timeslice; /* l: time-quantum for SCHED_M2 */
87 } l_sched;
88 struct cpu_info *volatile l_cpu;/* s: CPU we're on if LSONPROC */
89 kmutex_t * volatile l_mutex; /* l: ptr to mutex on sched state */
90 int l_ctxswtch; /* l: performing a context switch */
91 void *l_addr; /* l: PCB address; use lwp_getpcb() */
92 struct mdlwp l_md; /* l: machine-dependent fields. */
93 int l_flag; /* l: misc flag values */
94 int l_stat; /* l: overall LWP status */
95 struct bintime l_rtime; /* l: real time */
96 struct bintime l_stime; /* l: start time (while ONPROC) */
97 u_int l_swtime; /* l: time swapped in or out */
98 u_int l_rticks; /* l: Saved start time of run */
99 u_int l_rticksum; /* l: Sum of ticks spent running */
100 u_int l_slpticks; /* l: Saved start time of sleep */
101 u_int l_slpticksum; /* l: Sum of ticks spent sleeping */
102 int l_biglocks; /* l: biglock count before sleep */
103 int l_class; /* l: scheduling class */
104 int l_kpriority; /* !: has kernel priority boost */
105 pri_t l_kpribase; /* !: kernel priority base level */
106 pri_t l_priority; /* l: scheduler priority */
107 pri_t l_inheritedprio;/* l: inherited priority */
108 pri_t l_protectprio; /* l: for PTHREAD_PRIO_PROTECT */
109 pri_t l_auxprio; /* l: max(inherit,protect) priority */
110 int l_protectdepth; /* l: for PTHREAD_PRIO_PROTECT */
111 SLIST_HEAD(, turnstile) l_pi_lenders; /* l: ts lending us priority */
112 uint64_t l_ncsw; /* l: total context switches */
113 uint64_t l_nivcsw; /* l: involuntary context switches */
114 u_int l_cpticks; /* (: Ticks of CPU time */
115 fixpt_t l_pctcpu; /* p: %cpu during l_swtime */
116 fixpt_t l_estcpu; /* l: cpu time for SCHED_4BSD */
117 psetid_t l_psid; /* l: assigned processor-set ID */
118 struct cpu_info *l_target_cpu; /* l: target CPU to migrate */
119 struct lwpctl *l_lwpctl; /* p: lwpctl block kernel address */
120 struct lcpage *l_lcpage; /* p: lwpctl containing page */
121 kcpuset_t *l_affinity; /* l: CPU set for affinity */
122
123 /* Synchronisation. */
124 struct turnstile *l_ts; /* l: current turnstile */
125 struct syncobj *l_syncobj; /* l: sync object operations set */
126 TAILQ_ENTRY(lwp) l_sleepchain; /* l: sleep queue */
127 wchan_t l_wchan; /* l: sleep address */
128 const char *l_wmesg; /* l: reason for sleep */
129 struct sleepq *l_sleepq; /* l: current sleep queue */
130 int l_sleeperr; /* !: error before unblock */
131 u_int l_slptime; /* l: time since last blocked */
132 callout_t l_timeout_ch; /* !: callout for tsleep */
133 u_int l_emap_gen; /* !: emap generation number */
134 kcondvar_t l_waitcv; /* a: vfork() wait */
135 bool l_vforkwaiting; /* a: vfork() waiting */
136
137#if PCU_UNIT_COUNT > 0
138 struct cpu_info * volatile l_pcu_cpu[PCU_UNIT_COUNT];
139 uint32_t l_pcu_valid;
140#endif
141
142 /* Process level and global state, misc. */
143 LIST_ENTRY(lwp) l_list; /* a: entry on list of all LWPs */
144 void *l_ctxlink; /* p: uc_link {get,set}context */
145 struct proc *l_proc; /* p: parent process */
146 LIST_ENTRY(lwp) l_sibling; /* p: entry on proc's list of LWPs */
147 lwpid_t l_waiter; /* p: first LWP waiting on us */
148 lwpid_t l_waitingfor; /* p: specific LWP we are waiting on */
149 int l_prflag; /* p: process level flags */
150 u_int l_refcnt; /* p: reference count on this LWP */
151 lwpid_t l_lid; /* (: LWP identifier; local to proc */
152 char *l_name; /* (: name, optional */
153
154 /* State of select() or poll(). */
155 int l_selflag; /* S: polling state flags */
156 SLIST_HEAD(,selinfo) l_selwait; /* S: descriptors waited on */
157 int l_selret; /* S: return value of select/poll */
158 uintptr_t l_selrec; /* !: argument for selrecord() */
159 struct selcluster *l_selcluster;/* !: associated cluster data */
160 void * l_selbits; /* (: select() bit-field */
161 size_t l_selni; /* (: size of a single bit-field */
162
163 /* Signals. */
164 int l_sigrestore; /* p: need to restore old sig mask */
165 sigset_t l_sigwaitset; /* p: signals being waited for */
166 kcondvar_t l_sigcv; /* p: for sigsuspend() */
167 struct ksiginfo *l_sigwaited; /* p: delivered signals from set */
168 sigpend_t *l_sigpendset; /* p: XXX issignal()/postsig() baton */
169 LIST_ENTRY(lwp) l_sigwaiter; /* p: chain on list of waiting LWPs */
170 stack_t l_sigstk; /* p: sp & on stack state variable */
171 sigset_t l_sigmask; /* p: signal mask */
172 sigpend_t l_sigpend; /* p: signals to this LWP */
173 sigset_t l_sigoldmask; /* p: mask for sigpause */
174
175 /* Private data. */
176 specificdata_reference
177 l_specdataref; /* !: subsystem lwp-specific data */
178 struct timespec l_ktrcsw; /* !: for ktrace CSW trace XXX */
179 void *l_private; /* !: svr4-style lwp-private data */
180 struct lwp *l_switchto; /* !: mi_switch: switch to this LWP */
181 struct kauth_cred *l_cred; /* !: cached credentials */
182 struct filedesc *l_fd; /* !: cached copy of proc::p_fd */
183 void *l_emuldata; /* !: kernel lwp-private data */
184 struct fstrans_lwp_info *l_fstrans; /* (: fstrans private data */
185 u_int l_cv_signalled; /* c: restarted by cv_signal() */
186 u_short l_shlocks; /* !: lockdebug: shared locks held */
187 u_short l_exlocks; /* !: lockdebug: excl. locks held */
188 u_short l_psrefs; /* !: count of psref held */
189 u_short l_blcnt; /* !: count of kernel_lock held */
190 int l_nopreempt; /* !: don't preempt me! */
191 u_int l_dopreempt; /* s: kernel preemption pending */
192 int l_pflag; /* !: LWP private flags */
193 int l_dupfd; /* !: side return from cloning devs XXX */
194 const struct sysent * volatile l_sysent;/* !: currently active syscall */
195 struct rusage l_ru; /* !: accounting information */
196 uint64_t l_pfailtime; /* !: for kernel preemption */
197 uintptr_t l_pfailaddr; /* !: for kernel preemption */
198 uintptr_t l_pfaillock; /* !: for kernel preemption */
199 _TAILQ_HEAD(,struct lockdebug,volatile) l_ld_locks;/* !: locks held by LWP */
200 int l_tcgen; /* !: for timecounter removal */
201
202 /* These are only used by 'options SYSCALL_TIMES'. */
203 uint32_t l_syscall_time; /* !: time epoch for current syscall */
204 uint64_t *l_syscall_counter; /* !: counter for current process */
205
206 struct kdtrace_thread *l_dtrace; /* (: DTrace-specific data. */
207};
208
209/*
210 * UAREA_PCB_OFFSET: an offset of PCB structure in the uarea. MD code may
211 * define it in <machine/proc.h>, to indicate a different uarea layout.
212 */
213#ifndef UAREA_PCB_OFFSET
214#define UAREA_PCB_OFFSET 0
215#endif
216
217LIST_HEAD(lwplist, lwp); /* A list of LWPs. */
218
219#ifdef _KERNEL
220extern struct lwplist alllwp; /* List of all LWPs. */
221extern lwp_t lwp0; /* LWP for proc0. */
222extern int maxlwp __read_mostly; /* max number of lwps */
223#ifndef MAXLWP
224#define MAXLWP 2048
225#endif
226#ifndef __HAVE_CPU_MAXLWP
227#define cpu_maxlwp() MAXLWP
228#endif
229#endif
230
231#endif /* _KERNEL || _KMEMUSER */
232
233/* These flags are kept in l_flag. */
234#define LW_IDLE 0x00000001 /* Idle lwp. */
235#define LW_LWPCTL 0x00000002 /* Adjust lwpctl in userret */
236#define LW_CVLOCKDEBUG 0x00000004 /* Waker does lockdebug */
237#define LW_SINTR 0x00000080 /* Sleep is interruptible. */
238#define LW_SYSTEM 0x00000200 /* Kernel thread */
239#define LW_WSUSPEND 0x00020000 /* Suspend before return to user */
240#define LW_BATCH 0x00040000 /* LWP tends to hog CPU */
241#define LW_WCORE 0x00080000 /* Stop for core dump on return to user */
242#define LW_WEXIT 0x00100000 /* Exit before return to user */
243#define LW_PENDSIG 0x01000000 /* Pending signal for us */
244#define LW_CANCELLED 0x02000000 /* tsleep should not sleep */
245#define LW_WREBOOT 0x08000000 /* System is rebooting, please suspend */
246#define LW_UNPARKED 0x10000000 /* Unpark op pending */
247#define LW_RUMP_CLEAR 0x40000000 /* Clear curlwp in RUMP scheduler */
248#define LW_RUMP_QEXIT 0x80000000 /* LWP should exit ASAP */
249
250/* The second set of flags is kept in l_pflag. */
251#define LP_KTRACTIVE 0x00000001 /* Executing ktrace operation */
252#define LP_KTRCSW 0x00000002 /* ktrace context switch marker */
253#define LP_KTRCSWUSER 0x00000004 /* ktrace context switch marker */
254#define LP_PIDLID 0x00000008 /* free LID from PID space on exit */
255#define LP_OWEUPC 0x00000010 /* Owe user profiling tick */
256#define LP_MPSAFE 0x00000020 /* Starts life without kernel_lock */
257#define LP_INTR 0x00000040 /* Soft interrupt handler */
258#define LP_SYSCTLWRITE 0x00000080 /* sysctl write lock held */
259#define LP_MUSTJOIN 0x00000100 /* Must join kthread on exit */
260#define LP_SINGLESTEP 0x00000400 /* Single step thread in ptrace(2) */
261#define LP_TIMEINTR 0x00010000 /* Time this soft interrupt */
262#define LP_PREEMPTING 0x00020000 /* mi_switch called involuntarily */
263#define LP_RUNNING 0x20000000 /* Active on a CPU */
264#define LP_BOUND 0x80000000 /* Bound to a CPU */
265
266/* The third set is kept in l_prflag. */
267#define LPR_DETACHED 0x00800000 /* Won't be waited for. */
268#define LPR_CRMOD 0x00000100 /* Credentials modified */
269
270/*
271 * Mask indicating that there is "exceptional" work to be done on return to
272 * user.
273 */
274#define LW_USERRET \
275 (LW_WEXIT | LW_PENDSIG | LW_WREBOOT | LW_WSUSPEND | LW_WCORE | LW_LWPCTL)
276
277/*
278 * Status values.
279 *
280 * A note about LSRUN and LSONPROC: LSRUN indicates that a process is
281 * runnable but *not* yet running, i.e. is on a run queue. LSONPROC
282 * indicates that the process is actually executing on a CPU, i.e.
283 * it is no longer on a run queue.
284 *
285 * These values are set in stone and must not be reused with future changes.
286 */
287#define LSIDL 1 /* Process being created by fork. */
288#define LSRUN 2 /* Currently runnable. */
289#define LSSLEEP 3 /* Sleeping on an address. */
290#define LSSTOP 4 /* Process debugging or suspension. */
291#define LSZOMB 5 /* Awaiting collection by parent. */
292/* define LSDEAD 6 Process is almost a zombie. (removed in 5.0) */
293#define LSONPROC 7 /* Process is currently on a CPU. */
294#define LSSUSPENDED 8 /* Not running, not signalable. */
295
296#if defined(_KERNEL) || defined(_KMEMUSER)
297static __inline void *
298lwp_getpcb(struct lwp *l)
299{
300
301 return l->l_addr;
302}
303#endif /* _KERNEL || _KMEMUSER */
304
305#ifdef _KERNEL
306#define LWP_CACHE_CREDS(l, p) \
307do { \
308 (void)p; \
309 if (__predict_false((l)->l_prflag & LPR_CRMOD)) \
310 lwp_update_creds(l); \
311} while (/* CONSTCOND */ 0)
312
313void lwpinit(void);
314void lwp0_init(void);
315void lwp_sys_init(void);
316
317void lwp_startup(lwp_t *, lwp_t *);
318void startlwp(void *);
319
320int lwp_locked(lwp_t *, kmutex_t *);
321void lwp_setlock(lwp_t *, kmutex_t *);
322void lwp_unlock_to(lwp_t *, kmutex_t *);
323int lwp_trylock(lwp_t *);
324void lwp_addref(lwp_t *);
325void lwp_delref(lwp_t *);
326void lwp_delref2(lwp_t *);
327void lwp_drainrefs(lwp_t *);
328bool lwp_alive(lwp_t *);
329lwp_t *lwp_find_first(proc_t *);
330
331int lwp_wait(lwp_t *, lwpid_t, lwpid_t *, bool);
332void lwp_continue(lwp_t *);
333void lwp_unsleep(lwp_t *, bool);
334void lwp_unstop(lwp_t *);
335void lwp_exit(lwp_t *);
336void lwp_exit_switchaway(lwp_t *) __dead;
337int lwp_suspend(lwp_t *, lwp_t *);
338int lwp_create1(lwp_t *, const void *, size_t, u_long, lwpid_t *);
339void lwp_update_creds(lwp_t *);
340void lwp_migrate(lwp_t *, struct cpu_info *);
341lwp_t * lwp_find2(pid_t, lwpid_t);
342lwp_t * lwp_find(proc_t *, int);
343void lwp_userret(lwp_t *);
344void lwp_need_userret(lwp_t *);
345void lwp_free(lwp_t *, bool, bool);
346uint64_t lwp_pctr(void);
347int lwp_setprivate(lwp_t *, void *);
348int do_lwp_create(lwp_t *, void *, u_long, lwpid_t *, const sigset_t *,
349 const stack_t *);
350
351void lwpinit_specificdata(void);
352int lwp_specific_key_create(specificdata_key_t *, specificdata_dtor_t);
353void lwp_specific_key_delete(specificdata_key_t);
354void lwp_initspecific(lwp_t *);
355void lwp_finispecific(lwp_t *);
356void *lwp_getspecific(specificdata_key_t);
357#if defined(_LWP_API_PRIVATE)
358void *_lwp_getspecific_by_lwp(lwp_t *, specificdata_key_t);
359#endif
360void lwp_setspecific(specificdata_key_t, void *);
361void lwp_setspecific_by_lwp(lwp_t *, specificdata_key_t, void *);
362
363/* Syscalls. */
364int lwp_park(clockid_t, int, struct timespec *, const void *);
365int lwp_unpark(lwpid_t, const void *);
366
367/* DDB. */
368void lwp_whatis(uintptr_t, void (*)(const char *, ...) __printflike(1, 2));
369
370/*
371 * Lock an LWP. XXX _MODULE
372 */
373static __inline void
374lwp_lock(lwp_t *l)
375{
376 kmutex_t *old = l->l_mutex;
377
378 /*
379 * Note: mutex_spin_enter() will have posted a read barrier.
380 * Re-test l->l_mutex. If it has changed, we need to try again.
381 */
382 mutex_spin_enter(old);
383 while (__predict_false(l->l_mutex != old)) {
384 mutex_spin_exit(old);
385 old = l->l_mutex;
386 mutex_spin_enter(old);
387 }
388}
389
390/*
391 * Unlock an LWP. XXX _MODULE
392 */
393static __inline void
394lwp_unlock(lwp_t *l)
395{
396 mutex_spin_exit(l->l_mutex);
397}
398
399static __inline void
400lwp_changepri(lwp_t *l, pri_t pri)
401{
402 KASSERT(mutex_owned(l->l_mutex));
403
404 if (l->l_priority == pri)
405 return;
406
407 (*l->l_syncobj->sobj_changepri)(l, pri);
408 KASSERT(l->l_priority == pri);
409}
410
411static __inline void
412lwp_lendpri(lwp_t *l, pri_t pri)
413{
414 KASSERT(mutex_owned(l->l_mutex));
415
416 (*l->l_syncobj->sobj_lendpri)(l, pri);
417 KASSERT(l->l_inheritedprio == pri);
418}
419
420static __inline pri_t
421lwp_eprio(lwp_t *l)
422{
423 pri_t pri;
424
425 pri = l->l_priority;
426 if ((l->l_flag & LW_SYSTEM) == 0 && l->l_kpriority && pri < PRI_KERNEL)
427 pri = (pri >> 1) + l->l_kpribase;
428 return MAX(l->l_auxprio, pri);
429}
430
431int lwp_create(lwp_t *, struct proc *, vaddr_t, int, void *, size_t,
432 void (*)(void *), void *, lwp_t **, int, const sigset_t *, const stack_t *);
433
434/*
435 * XXX _MODULE
436 * We should provide real stubs for the below that modules can use.
437 */
438
439static __inline void
440spc_lock(struct cpu_info *ci)
441{
442 mutex_spin_enter(ci->ci_schedstate.spc_mutex);
443}
444
445static __inline void
446spc_unlock(struct cpu_info *ci)
447{
448 mutex_spin_exit(ci->ci_schedstate.spc_mutex);
449}
450
451static __inline void
452spc_dlock(struct cpu_info *ci1, struct cpu_info *ci2)
453{
454 struct schedstate_percpu *spc1 = &ci1->ci_schedstate;
455 struct schedstate_percpu *spc2 = &ci2->ci_schedstate;
456
457 KASSERT(ci1 != ci2);
458 if (ci1 < ci2) {
459 mutex_spin_enter(spc1->spc_mutex);
460 mutex_spin_enter(spc2->spc_mutex);
461 } else {
462 mutex_spin_enter(spc2->spc_mutex);
463 mutex_spin_enter(spc1->spc_mutex);
464 }
465}
466
467/*
468 * Allow machine-dependent code to override curlwp in <machine/cpu.h> for
469 * its own convenience. Otherwise, we declare it as appropriate.
470 */
471#if !defined(curlwp)
472#if defined(MULTIPROCESSOR)
473#define curlwp curcpu()->ci_curlwp /* Current running LWP */
474#else
475extern struct lwp *curlwp; /* Current running LWP */
476#endif /* MULTIPROCESSOR */
477#endif /* ! curlwp */
478#define curproc (curlwp->l_proc)
479
480/*
481 * This provide a way for <machine/cpu.h> to get l_cpu for curlwp before
482 * struct lwp is defined.
483 */
484static __inline struct cpu_info *
485lwp_getcpu(struct lwp *l)
486{
487 return l->l_cpu;
488}
489
490static __inline bool
491CURCPU_IDLE_P(void)
492{
493 struct cpu_info *ci = curcpu();
494 return ci->ci_data.cpu_onproc == ci->ci_data.cpu_idlelwp;
495}
496
497/*
498 * Disable and re-enable preemption. Only for low-level kernel
499 * use. Device drivers and anything that could potentially be
500 * compiled as a module should use kpreempt_disable() and
501 * kpreempt_enable().
502 */
503static __inline void
504KPREEMPT_DISABLE(lwp_t *l)
505{
506
507 KASSERT(l == curlwp);
508 l->l_nopreempt++;
509 __insn_barrier();
510}
511
512static __inline void
513KPREEMPT_ENABLE(lwp_t *l)
514{
515
516 KASSERT(l == curlwp);
517 KASSERT(l->l_nopreempt > 0);
518 __insn_barrier();
519 if (--l->l_nopreempt != 0)
520 return;
521 __insn_barrier();
522 if (__predict_false(l->l_dopreempt))
523 kpreempt(0);
524 __insn_barrier();
525}
526
527/* For lwp::l_dopreempt */
528#define DOPREEMPT_ACTIVE 0x01
529#define DOPREEMPT_COUNTED 0x02
530
531/*
532 * Prevent curlwp from migrating between CPUs between curlwp_bind and
533 * curlwp_bindx. One use case is psref(9) that has a contract that
534 * forbids migrations.
535 */
536static __inline int
537curlwp_bind(void)
538{
539 int bound;
540
541 bound = curlwp->l_pflag & LP_BOUND;
542 curlwp->l_pflag |= LP_BOUND;
543 __insn_barrier();
544
545 return bound;
546}
547
548static __inline void
549curlwp_bindx(int bound)
550{
551
552 KASSERT(curlwp->l_pflag & LP_BOUND);
553 __insn_barrier();
554 curlwp->l_pflag ^= bound ^ LP_BOUND;
555}
556
557#endif /* _KERNEL */
558
559/* Flags for _lwp_create(), as per Solaris. */
560#define LWP_DETACHED 0x00000040
561#define LWP_SUSPENDED 0x00000080
562
563/* Kernel-internal flags for LWP creation. */
564#define LWP_PIDLID 0x40000000
565#define LWP_VFORK 0x80000000
566
567#endif /* !_SYS_LWP_H_ */
568