Annotation of src/sys/sys/lwp.h, Revision 1.89.2.6
1.89.2.6! yamt 1: /* $NetBSD: lwp.h,v 1.89.2.5 2010/03/11 15:04:42 yamt Exp $ */
1.2 thorpej 2:
3: /*-
1.89.2.6! yamt 4: * Copyright (c) 2001, 2006, 2007, 2008, 2009, 2010
! 5: * The NetBSD Foundation, Inc.
1.2 thorpej 6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
1.47 ad 9: * by Nathan J. Williams and Andrew Doran.
1.2 thorpej 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:
1.31 christos 33: #ifndef _SYS_LWP_H_
34: #define _SYS_LWP_H_
1.2 thorpej 35:
1.89.2.6! yamt 36: #include <sys/param.h>
1.47 ad 37: #include <sys/time.h>
38: #include <sys/queue.h>
39: #include <sys/callout.h>
40: #include <sys/mutex.h>
41: #include <sys/condvar.h>
42: #include <sys/signalvar.h>
1.78 rmind 43: #include <sys/sched.h>
1.47 ad 44: #include <sys/specificdata.h>
1.53 yamt 45: #include <sys/syncobj.h>
1.85 ad 46: #include <sys/resource.h>
1.2 thorpej 47:
48: #if defined(_KERNEL)
49: #include <machine/cpu.h> /* curcpu() and cpu_info */
50: #endif
1.47 ad 51:
1.2 thorpej 52: #include <machine/proc.h> /* Machine-dependent proc substruct. */
53:
1.47 ad 54: /*
55: * Lightweight process. Field markings and the corresponding locks:
56: *
1.89.2.5 yamt 57: * a: proclist_lock
1.58 ad 58: * c: condition variable interlock, passed to cv_wait()
1.47 ad 59: * l: *l_mutex
1.88 ad 60: * p: l_proc->p_lock
1.60 yamt 61: * s: spc_mutex, which may or may not be referenced by l_mutex
1.89.2.6! yamt 62: * S: l_selcluster->sc_lock
1.47 ad 63: * (: unlocked, stable
1.68 ad 64: * !: unlocked, may only be reliably accessed by the LWP itself
1.47 ad 65: * ?: undecided
66: *
67: * Fields are clustered together by usage (to increase the likelyhood
68: * of cache hits) and by size (to reduce dead space in the structure).
69: */
1.89.2.1 yamt 70: struct lockdebug;
1.89.2.2 yamt 71: struct sadata_vp;
72: struct sysent;
1.89.2.1 yamt 73:
1.60 yamt 74: struct lwp {
1.47 ad 75: /* Scheduling and overall state */
1.60 yamt 76: TAILQ_ENTRY(lwp) l_runq; /* s: run queue */
1.89.2.2 yamt 77: union {
78: void * info; /* s: scheduler-specific structure */
79: u_int timeslice; /* l: time-quantum for SCHED_M2 */
80: } l_sched;
1.47 ad 81: struct cpu_info *volatile l_cpu;/* s: CPU we're on if LSONPROC */
82: kmutex_t * volatile l_mutex; /* l: ptr to mutex on sched state */
1.70 ad 83: int l_ctxswtch; /* l: performing a context switch */
1.89.2.5 yamt 84: struct user *l_addr; /* l: PCB address; use lwp_getpcb() */
1.47 ad 85: struct mdlwp l_md; /* l: machine-dependent fields. */
86: int l_flag; /* l: misc flag values */
87: int l_stat; /* l: overall LWP status */
1.73 yamt 88: struct bintime l_rtime; /* l: real time */
89: struct bintime l_stime; /* l: start time (while ONPROC) */
1.47 ad 90: u_int l_swtime; /* l: time swapped in or out */
1.89.2.5 yamt 91: u_int _reserved1;
1.86 ad 92: u_int l_rticks; /* l: Saved start time of run */
93: u_int l_rticksum; /* l: Sum of ticks spent running */
1.89.2.2 yamt 94: u_int l_slpticks; /* l: Saved start time of sleep */
95: u_int l_slpticksum; /* l: Sum of ticks spent sleeping */
1.47 ad 96: int l_biglocks; /* l: biglock count before sleep */
1.68 ad 97: int l_class; /* l: scheduling class */
98: int l_kpriority; /* !: has kernel priority boost */
1.71 ad 99: pri_t l_kpribase; /* !: kernel priority base level */
1.68 ad 100: pri_t l_priority; /* l: scheduler priority */
1.54 yamt 101: pri_t l_inheritedprio;/* l: inherited priority */
1.52 yamt 102: SLIST_HEAD(, turnstile) l_pi_lenders; /* l: ts lending us priority */
1.60 yamt 103: uint64_t l_ncsw; /* l: total context switches */
104: uint64_t l_nivcsw; /* l: involuntary context switches */
1.89.2.2 yamt 105: u_int l_cpticks; /* (: Ticks of CPU time */
106: fixpt_t l_pctcpu; /* p: %cpu during l_swtime */
1.68 ad 107: fixpt_t l_estcpu; /* l: cpu time for SCHED_4BSD */
1.77 rmind 108: psetid_t l_psid; /* l: assigned processor-set ID */
109: struct cpu_info *l_target_cpu; /* l: target CPU to migrate */
1.69 ad 110: struct lwpctl *l_lwpctl; /* p: lwpctl block kernel address */
111: struct lcpage *l_lcpage; /* p: lwpctl containing page */
1.89.2.2 yamt 112: kcpuset_t *l_affinity; /* l: CPU set for affinity */
113: struct sadata_vp *l_savp; /* p: SA "virtual processor" */
1.47 ad 114:
115: /* Synchronisation */
116: struct turnstile *l_ts; /* l: current turnstile */
117: struct syncobj *l_syncobj; /* l: sync object operations set */
118: TAILQ_ENTRY(lwp) l_sleepchain; /* l: sleep queue */
119: wchan_t l_wchan; /* l: sleep address */
120: const char *l_wmesg; /* l: reason for sleep */
121: struct sleepq *l_sleepq; /* l: current sleep queue */
122: int l_sleeperr; /* !: error before unblock */
123: u_int l_slptime; /* l: time since last blocked */
1.68 ad 124: callout_t l_timeout_ch; /* !: callout for tsleep */
1.89.2.4 yamt 125: u_int l_emap_gen; /* !: emap generation number */
1.47 ad 126:
1.61 ad 127: /* Process level and global state, misc. */
1.47 ad 128: LIST_ENTRY(lwp) l_list; /* a: entry on list of all LWPs */
129: void *l_ctxlink; /* p: uc_link {get,set}context */
130: struct proc *l_proc; /* p: parent process */
131: LIST_ENTRY(lwp) l_sibling; /* p: entry on proc's list of LWPs */
1.57 ad 132: lwpid_t l_waiter; /* p: first LWP waiting on us */
133: lwpid_t l_waitingfor; /* p: specific LWP we are waiting on */
1.47 ad 134: int l_prflag; /* p: process level flags */
135: u_int l_refcnt; /* p: reference count on this LWP */
136: lwpid_t l_lid; /* (: LWP identifier; local to proc */
1.61 ad 137: char *l_name; /* (: name, optional */
1.47 ad 138:
1.89.2.6! yamt 139: /* State of select() or poll() */
! 140: int l_selflag; /* S: polling state flags */
! 141: SLIST_HEAD(,selinfo) l_selwait; /* S: descriptors waited on */
! 142: int l_selret; /* S: return value of select/poll */
! 143: uintptr_t l_selrec; /* (: argument for selrecord() */
! 144: struct selcluster *l_selcluster;/* (: associated cluster data */
! 145: void * l_selbits; /* (: select() bit-field */
! 146: size_t l_selni; /* (: size of a single bit-field */
! 147:
1.47 ad 148: /* Signals */
149: int l_sigrestore; /* p: need to restore old sig mask */
150: sigset_t l_sigwaitset; /* p: signals being waited for */
151: kcondvar_t l_sigcv; /* p: for sigsuspend() */
152: struct ksiginfo *l_sigwaited; /* p: delivered signals from set */
153: sigpend_t *l_sigpendset; /* p: XXX issignal()/postsig() baton */
154: LIST_ENTRY(lwp) l_sigwaiter; /* p: chain on list of waiting LWPs */
155: stack_t l_sigstk; /* p: sp & on stack state variable */
156: sigset_t l_sigmask; /* p: signal mask */
157: sigpend_t l_sigpend; /* p: signals to this LWP */
158: sigset_t l_sigoldmask; /* p: mask for sigpause */
1.2 thorpej 159:
1.47 ad 160: /* Private data */
1.42 thorpej 161: specificdata_reference
1.47 ad 162: l_specdataref; /* !: subsystem lwp-specific data */
1.89.2.2 yamt 163: struct timespec l_ktrcsw; /* !: for ktrace CSW trace XXX */
1.47 ad 164: void *l_private; /* !: svr4-style lwp-private data */
1.62 ad 165: struct lwp *l_switchto; /* !: mi_switch: switch to this LWP */
1.47 ad 166: struct kauth_cred *l_cred; /* !: cached credentials */
1.81 ad 167: struct filedesc *l_fd; /* !: cached copy of proc::p_fd */
1.47 ad 168: void *l_emuldata; /* !: kernel lwp-private data */
1.61 ad 169: u_int l_cv_signalled; /* c: restarted by cv_signal() */
1.47 ad 170: u_short l_shlocks; /* !: lockdebug: shared locks held */
171: u_short l_exlocks; /* !: lockdebug: excl. locks held */
1.89.2.1 yamt 172: u_short l_unused; /* !: unused */
1.61 ad 173: u_short l_blcnt; /* !: count of kernel_lock held */
1.89.2.1 yamt 174: int l_nopreempt; /* !: don't preempt me! */
175: u_int l_dopreempt; /* s: kernel preemption pending */
1.47 ad 176: int l_pflag; /* !: LWP private flags */
177: int l_dupfd; /* !: side return from cloning devs XXX */
1.89.2.2 yamt 178: const struct sysent * volatile l_sysent;/* !: currently active syscall */
1.85 ad 179: struct rusage l_ru; /* !: accounting information */
1.89.2.1 yamt 180: uint64_t l_pfailtime; /* !: for kernel preemption */
181: uintptr_t l_pfailaddr; /* !: for kernel preemption */
182: uintptr_t l_pfaillock; /* !: for kernel preemption */
183: _TAILQ_HEAD(,struct lockdebug,volatile) l_ld_locks;/* !: locks held by LWP */
1.89.2.3 yamt 184: int l_tcgen; /* !: for timecounter removal */
185: int l_unused2; /* !: for future use */
1.50 dsl 186:
187: /* These are only used by 'options SYSCALL_TIMES' */
188: uint32_t l_syscall_time; /* !: time epoch for current syscall */
189: uint64_t *l_syscall_counter; /* !: counter for current process */
1.89.2.5 yamt 190:
191: struct kdtrace_thread *l_dtrace; /* ?: DTrace-specific data. */
1.60 yamt 192: };
1.2 thorpej 193:
1.89.2.3 yamt 194: /*
195: * USER_TO_UAREA/UAREA_TO_USER: macros to convert between
196: * the lowest address of the uarea (UAREA) and lwp::l_addr (USER).
197: *
198: * the default is just a cast. MD code can modify it by defining
199: * either these macros or UAREA_USER_OFFSET in <machine/proc.h>.
200: */
201:
1.37 yamt 202: #if !defined(USER_TO_UAREA)
203: #if !defined(UAREA_USER_OFFSET)
204: #define UAREA_USER_OFFSET 0
205: #endif /* !defined(UAREA_USER_OFFSET) */
206: #define USER_TO_UAREA(user) ((vaddr_t)(user) - UAREA_USER_OFFSET)
207: #define UAREA_TO_USER(uarea) ((struct user *)((uarea) + UAREA_USER_OFFSET))
208: #endif /* !defined(UAREA_TO_USER) */
209:
1.89.2.5 yamt 210: static __inline void *
211: lwp_getpcb(struct lwp *l)
212: {
213:
214: return &l->l_addr->u_pcb;
215: }
216:
1.2 thorpej 217: LIST_HEAD(lwplist, lwp); /* a list of LWPs */
218:
1.29 christos 219: #ifdef _KERNEL
1.2 thorpej 220: extern struct lwplist alllwp; /* List of all LWPs. */
1.58 ad 221: extern lwp_t lwp0; /* LWP for proc0 */
1.29 christos 222: #endif
1.2 thorpej 223:
1.47 ad 224: /* These flags are kept in l_flag. */
1.60 yamt 225: #define LW_IDLE 0x00000001 /* Idle lwp. */
1.49 pavel 226: #define LW_SINTR 0x00000080 /* Sleep is interruptible. */
1.89.2.2 yamt 227: #define LW_SA_SWITCHING 0x00000100 /* SA LWP in context switch */
1.49 pavel 228: #define LW_SYSTEM 0x00000200 /* Kernel thread */
1.89.2.2 yamt 229: #define LW_SA 0x00000400 /* Scheduler activations LWP */
1.49 pavel 230: #define LW_WSUSPEND 0x00020000 /* Suspend before return to user */
1.89.2.2 yamt 231: #define LW_BATCH 0x00040000 /* LWP tends to hog CPU */
1.49 pavel 232: #define LW_WCORE 0x00080000 /* Stop for core dump on return to user */
233: #define LW_WEXIT 0x00100000 /* Exit before return to user */
1.77 rmind 234: #define LW_AFFINITY 0x00200000 /* Affinity is assigned to the thread */
1.89.2.2 yamt 235: #define LW_SA_UPCALL 0x00400000 /* SA upcall is pending */
236: #define LW_SA_BLOCKING 0x00800000 /* Blocking in tsleep() */
1.49 pavel 237: #define LW_PENDSIG 0x01000000 /* Pending signal for us */
238: #define LW_CANCELLED 0x02000000 /* tsleep should not sleep */
239: #define LW_WREBOOT 0x08000000 /* System is rebooting, please suspend */
1.60 yamt 240: #define LW_UNPARKED 0x10000000 /* Unpark op pending */
1.89.2.2 yamt 241: #define LW_SA_YIELD 0x40000000 /* LWP on VP is yielding */
242: #define LW_SA_IDLE 0x80000000 /* VP is idle */
1.47 ad 243:
244: /* The second set of flags is kept in l_pflag. */
245: #define LP_KTRACTIVE 0x00000001 /* Executing ktrace operation */
246: #define LP_KTRCSW 0x00000002 /* ktrace context switch marker */
247: #define LP_KTRCSWUSER 0x00000004 /* ktrace context switch marker */
1.89.2.6! yamt 248: #define LP_PIDLID 0x00000008 /* free LID from PID space on exit */
1.47 ad 249: #define LP_OWEUPC 0x00000010 /* Owe user profiling tick */
1.61 ad 250: #define LP_MPSAFE 0x00000020 /* Starts life without kernel_lock */
1.68 ad 251: #define LP_INTR 0x00000040 /* Soft interrupt handler */
1.76 ad 252: #define LP_SYSCTLWRITE 0x00000080 /* sysctl write lock held */
1.89.2.2 yamt 253: #define LP_SA_PAGEFAULT 0x00000200 /* SA LWP in pagefault handler */
254: #define LP_SA_NOBLOCK 0x00000400 /* SA don't upcall on block */
255: #define LP_TIMEINTR 0x00010000 /* Time this soft interrupt */
256: #define LP_RUNNING 0x20000000 /* Active on a CPU */
1.87 ad 257: #define LP_BOUND 0x80000000 /* Bound to a CPU */
1.47 ad 258:
259: /* The third set is kept in l_prflag. */
260: #define LPR_DETACHED 0x00800000 /* Won't be waited for. */
1.82 ad 261: #define LPR_CRMOD 0x00000100 /* Credentials modified */
1.47 ad 262:
263: /*
264: * Mask indicating that there is "exceptional" work to be done on return to
265: * user.
266: */
1.49 pavel 267: #define LW_USERRET (LW_WEXIT|LW_PENDSIG|LW_WREBOOT|LW_WSUSPEND|LW_WCORE|\
1.89.2.6! yamt 268: LW_SA_BLOCKING|LW_SA_UPCALL)
1.2 thorpej 269:
270: /*
271: * Status values.
272: *
273: * A note about SRUN and SONPROC: SRUN indicates that a process is
274: * runnable but *not* yet running, i.e. is on a run queue. SONPROC
275: * indicates that the process is actually executing on a CPU, i.e.
276: * it is no longer on a run queue.
277: */
1.47 ad 278: #define LSIDL 1 /* Process being created by fork. */
279: #define LSRUN 2 /* Currently runnable. */
280: #define LSSLEEP 3 /* Sleeping on an address. */
281: #define LSSTOP 4 /* Process debugging or suspension. */
282: #define LSZOMB 5 /* Awaiting collection by parent. */
1.49 pavel 283: /* unused, for source compatibility with NetBSD 4.0 and earlier. */
284: #define LSDEAD 6 /* Process is almost a zombie. */
1.2 thorpej 285: #define LSONPROC 7 /* Process is currently on a CPU. */
286: #define LSSUSPENDED 8 /* Not running, not signalable. */
287:
288: #ifdef _KERNEL
1.38 ad 289: #define LWP_CACHE_CREDS(l, p) \
290: do { \
1.82 ad 291: (void)p; \
292: if (__predict_false((l)->l_prflag & LPR_CRMOD)) \
1.38 ad 293: lwp_update_creds(l); \
294: } while (/* CONSTCOND */ 0)
1.2 thorpej 295:
1.60 yamt 296: void lwp_startup(lwp_t *, lwp_t *);
1.2 thorpej 297:
1.58 ad 298: int lwp_locked(lwp_t *, kmutex_t *);
299: void lwp_setlock(lwp_t *, kmutex_t *);
300: void lwp_unlock_to(lwp_t *, kmutex_t *);
1.89.2.2 yamt 301: kmutex_t *lwp_lock_retry(lwp_t *, kmutex_t *);
1.58 ad 302: void lwp_relock(lwp_t *, kmutex_t *);
303: int lwp_trylock(lwp_t *);
304: void lwp_addref(lwp_t *);
305: void lwp_delref(lwp_t *);
1.89.2.6! yamt 306: void lwp_delref2(lwp_t *);
1.58 ad 307: void lwp_drainrefs(lwp_t *);
1.89.2.2 yamt 308: bool lwp_alive(lwp_t *);
309: lwp_t *lwp_find_first(proc_t *);
1.2 thorpej 310:
311: /* Flags for _lwp_wait1 */
312: #define LWPWAIT_EXITCONTROL 0x00000001
1.42 thorpej 313: void lwpinit(void);
1.89.2.6! yamt 314: void lwp0_init(void);
1.58 ad 315: int lwp_wait1(lwp_t *, lwpid_t, lwpid_t *, int);
316: void lwp_continue(lwp_t *);
1.89.2.6! yamt 317: void lwp_unstop(lwp_t *);
1.58 ad 318: void cpu_setfunc(lwp_t *, void (*)(void *), void *);
1.2 thorpej 319: void startlwp(void *);
1.58 ad 320: void upcallret(lwp_t *);
1.89.2.6! yamt 321: void lwp_exit(lwp_t *);
1.89.2.2 yamt 322: void lwp_exit_switchaway(lwp_t *) __dead;
1.58 ad 323: int lwp_suspend(lwp_t *, lwp_t *);
324: int lwp_create1(lwp_t *, const void *, size_t, u_long, lwpid_t *);
325: void lwp_update_creds(lwp_t *);
1.77 rmind 326: void lwp_migrate(lwp_t *, struct cpu_info *);
327: lwp_t *lwp_find2(pid_t, lwpid_t);
328: lwp_t *lwp_find(proc_t *, int);
1.58 ad 329: void lwp_userret(lwp_t *);
330: void lwp_need_userret(lwp_t *);
331: void lwp_free(lwp_t *, bool, bool);
1.47 ad 332: void lwp_sys_init(void);
1.89.2.5 yamt 333: void lwp_unsleep(lwp_t *, bool);
1.89.2.3 yamt 334: uint64_t lwp_pctr(void);
1.89.2.6! yamt 335: int lwp_setprivate(lwp_t *, void *);
1.42 thorpej 336:
1.89.2.6! yamt 337: void lwpinit_specificdata(void);
1.42 thorpej 338: int lwp_specific_key_create(specificdata_key_t *, specificdata_dtor_t);
339: void lwp_specific_key_delete(specificdata_key_t);
1.58 ad 340: void lwp_initspecific(lwp_t *);
341: void lwp_finispecific(lwp_t *);
342: void *lwp_getspecific(specificdata_key_t);
1.46 hannken 343: #if defined(_LWP_API_PRIVATE)
1.58 ad 344: void *_lwp_getspecific_by_lwp(lwp_t *, specificdata_key_t);
1.46 hannken 345: #endif
1.44 thorpej 346: void lwp_setspecific(specificdata_key_t, void *);
1.47 ad 347:
1.63 ad 348: /* Syscalls */
349: int lwp_park(struct timespec *, const void *);
350: int lwp_unpark(lwpid_t, const void *);
351:
1.72 yamt 352: /* ddb */
353: void lwp_whatis(uintptr_t, void (*)(const char *, ...));
354:
1.63 ad 355:
1.47 ad 356: /*
1.89.2.2 yamt 357: * Lock an LWP. XXX _MODULE
1.47 ad 358: */
359: static inline void
1.58 ad 360: lwp_lock(lwp_t *l)
1.47 ad 361: {
362: kmutex_t *old;
363:
364: mutex_spin_enter(old = l->l_mutex);
365:
366: /*
367: * mutex_enter() will have posted a read barrier. Re-test
368: * l->l_mutex. If it has changed, we need to try again.
369: */
370: if (__predict_false(l->l_mutex != old))
371: lwp_lock_retry(l, old);
372: }
373:
374: /*
1.89.2.2 yamt 375: * Unlock an LWP. XXX _MODULE
1.47 ad 376: */
377: static inline void
1.58 ad 378: lwp_unlock(lwp_t *l)
1.47 ad 379: {
380: mutex_spin_exit(l->l_mutex);
381: }
382:
383: static inline void
1.58 ad 384: lwp_changepri(lwp_t *l, pri_t pri)
1.47 ad 385: {
1.60 yamt 386: KASSERT(mutex_owned(l->l_mutex));
1.47 ad 387:
388: (*l->l_syncobj->sobj_changepri)(l, pri);
389: }
390:
391: static inline void
1.58 ad 392: lwp_lendpri(lwp_t *l, pri_t pri)
1.52 yamt 393: {
1.60 yamt 394: KASSERT(mutex_owned(l->l_mutex));
1.52 yamt 395:
396: if (l->l_inheritedprio == pri)
397: return;
398:
399: (*l->l_syncobj->sobj_lendpri)(l, pri);
400: }
401:
1.68 ad 402: static inline pri_t
1.58 ad 403: lwp_eprio(lwp_t *l)
1.52 yamt 404: {
1.68 ad 405: pri_t pri;
1.52 yamt 406:
1.68 ad 407: pri = l->l_priority;
408: if (l->l_kpriority && pri < PRI_KERNEL)
1.71 ad 409: pri = (pri >> 1) + l->l_kpribase;
1.68 ad 410: return MAX(l->l_inheritedprio, pri);
1.52 yamt 411: }
412:
1.89.2.5 yamt 413: int lwp_create(lwp_t *, struct proc *, vaddr_t, int,
1.68 ad 414: void *, size_t, void (*)(void *), void *, lwp_t **, int);
1.47 ad 415:
416: /*
1.89.2.2 yamt 417: * XXX _MODULE
418: * We should provide real stubs for the below that modules can use.
1.47 ad 419: */
420:
421: static inline void
1.60 yamt 422: spc_lock(struct cpu_info *ci)
1.47 ad 423: {
1.60 yamt 424: mutex_spin_enter(ci->ci_schedstate.spc_mutex);
1.47 ad 425: }
426:
427: static inline void
1.60 yamt 428: spc_unlock(struct cpu_info *ci)
1.47 ad 429: {
1.60 yamt 430: mutex_spin_exit(ci->ci_schedstate.spc_mutex);
1.47 ad 431: }
432:
1.77 rmind 433: static inline void
434: spc_dlock(struct cpu_info *ci1, struct cpu_info *ci2)
435: {
436: struct schedstate_percpu *spc1 = &ci1->ci_schedstate;
437: struct schedstate_percpu *spc2 = &ci2->ci_schedstate;
438:
439: KASSERT(ci1 != ci2);
1.86 ad 440: if (ci1 < ci2) {
1.77 rmind 441: mutex_spin_enter(spc1->spc_mutex);
442: mutex_spin_enter(spc2->spc_mutex);
443: } else {
444: mutex_spin_enter(spc2->spc_mutex);
445: mutex_spin_enter(spc1->spc_mutex);
446: }
447: }
448:
1.89 ad 449: /*
1.89.2.1 yamt 450: * Allow machine-dependent code to override curlwp in <machine/cpu.h> for
451: * its own convenience. Otherwise, we declare it as appropriate.
452: */
453: #if !defined(curlwp)
454: #if defined(MULTIPROCESSOR)
455: #define curlwp curcpu()->ci_curlwp /* Current running LWP */
456: #else
457: extern struct lwp *curlwp; /* Current running LWP */
458: #endif /* MULTIPROCESSOR */
459: #endif /* ! curlwp */
460: #define curproc (curlwp->l_proc)
461:
462: static inline bool
463: CURCPU_IDLE_P(void)
464: {
465: struct cpu_info *ci = curcpu();
466: return ci->ci_data.cpu_onproc == ci->ci_data.cpu_idlelwp;
467: }
468:
469: /*
1.89 ad 470: * Disable and re-enable preemption. Only for low-level kernel
1.89.2.2 yamt 471: * use. Device drivers and anything that could potentially be
472: * compiled as a module should use kpreempt_disable() and
1.89 ad 473: * kpreempt_enable().
474: */
475: static inline void
1.89.2.1 yamt 476: KPREEMPT_DISABLE(lwp_t *l)
1.89 ad 477: {
478:
1.89.2.1 yamt 479: KASSERT(l == curlwp);
480: l->l_nopreempt++;
1.89 ad 481: __insn_barrier();
482: }
483:
484: static inline void
1.89.2.1 yamt 485: KPREEMPT_ENABLE(lwp_t *l)
1.89 ad 486: {
487:
1.89.2.1 yamt 488: KASSERT(l == curlwp);
489: KASSERT(l->l_nopreempt > 0);
490: __insn_barrier();
491: if (--l->l_nopreempt != 0)
492: return;
493: __insn_barrier();
494: if (__predict_false(l->l_dopreempt))
495: kpreempt(0);
1.89 ad 496: __insn_barrier();
497: }
498:
1.89.2.1 yamt 499: /* For lwp::l_dopreempt */
500: #define DOPREEMPT_ACTIVE 0x01
501: #define DOPREEMPT_COUNTED 0x02
502:
1.60 yamt 503: #endif /* _KERNEL */
1.2 thorpej 504:
505: /* Flags for _lwp_create(), as per Solaris. */
506: #define LWP_DETACHED 0x00000040
507: #define LWP_SUSPENDED 0x00000080
1.89.2.6! yamt 508:
! 509: /* Kernel-internal flags for LWP creation. */
! 510: #define LWP_PIDLID 0x40000000
1.89.2.2 yamt 511: #define LWP_VFORK 0x80000000
1.2 thorpej 512:
513: #endif /* !_SYS_LWP_H_ */
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