| 1 | /* $NetBSD: lwp.h,v 1.172 2016/07/03 14:24:59 christos 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) |
| 52 | struct lwp; |
| 53 | /* forward declare this for <machine/cpu.h> so it can get l_cpu. */ |
| 54 | static 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 likelyhood |
| 73 | * of cache hits) and by size (to reduce dead space in the structure). |
| 74 | */ |
| 75 | |
| 76 | #include <sys/pcu.h> |
| 77 | |
| 78 | struct lockdebug; |
| 79 | struct sysent; |
| 80 | |
| 81 | struct 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 | |
| 136 | #if PCU_UNIT_COUNT > 0 |
| 137 | struct cpu_info * volatile l_pcu_cpu[PCU_UNIT_COUNT]; |
| 138 | uint32_t l_pcu_valid; |
| 139 | #endif |
| 140 | |
| 141 | /* Process level and global state, misc. */ |
| 142 | LIST_ENTRY(lwp) l_list; /* a: entry on list of all LWPs */ |
| 143 | void *l_ctxlink; /* p: uc_link {get,set}context */ |
| 144 | struct proc *l_proc; /* p: parent process */ |
| 145 | LIST_ENTRY(lwp) l_sibling; /* p: entry on proc's list of LWPs */ |
| 146 | lwpid_t l_waiter; /* p: first LWP waiting on us */ |
| 147 | lwpid_t l_waitingfor; /* p: specific LWP we are waiting on */ |
| 148 | int l_prflag; /* p: process level flags */ |
| 149 | u_int l_refcnt; /* p: reference count on this LWP */ |
| 150 | lwpid_t l_lid; /* (: LWP identifier; local to proc */ |
| 151 | char *l_name; /* (: name, optional */ |
| 152 | |
| 153 | /* State of select() or poll(). */ |
| 154 | int l_selflag; /* S: polling state flags */ |
| 155 | SLIST_HEAD(,selinfo) l_selwait; /* S: descriptors waited on */ |
| 156 | int l_selret; /* S: return value of select/poll */ |
| 157 | uintptr_t l_selrec; /* !: argument for selrecord() */ |
| 158 | struct selcluster *l_selcluster;/* !: associated cluster data */ |
| 159 | void * l_selbits; /* (: select() bit-field */ |
| 160 | size_t l_selni; /* (: size of a single bit-field */ |
| 161 | |
| 162 | /* Signals. */ |
| 163 | int l_sigrestore; /* p: need to restore old sig mask */ |
| 164 | sigset_t l_sigwaitset; /* p: signals being waited for */ |
| 165 | kcondvar_t l_sigcv; /* p: for sigsuspend() */ |
| 166 | struct ksiginfo *l_sigwaited; /* p: delivered signals from set */ |
| 167 | sigpend_t *l_sigpendset; /* p: XXX issignal()/postsig() baton */ |
| 168 | LIST_ENTRY(lwp) l_sigwaiter; /* p: chain on list of waiting LWPs */ |
| 169 | stack_t l_sigstk; /* p: sp & on stack state variable */ |
| 170 | sigset_t l_sigmask; /* p: signal mask */ |
| 171 | sigpend_t l_sigpend; /* p: signals to this LWP */ |
| 172 | sigset_t l_sigoldmask; /* p: mask for sigpause */ |
| 173 | |
| 174 | /* Private data. */ |
| 175 | specificdata_reference |
| 176 | l_specdataref; /* !: subsystem lwp-specific data */ |
| 177 | struct timespec l_ktrcsw; /* !: for ktrace CSW trace XXX */ |
| 178 | void *l_private; /* !: svr4-style lwp-private data */ |
| 179 | struct lwp *l_switchto; /* !: mi_switch: switch to this LWP */ |
| 180 | struct kauth_cred *l_cred; /* !: cached credentials */ |
| 181 | struct filedesc *l_fd; /* !: cached copy of proc::p_fd */ |
| 182 | void *l_emuldata; /* !: kernel lwp-private data */ |
| 183 | u_int l_cv_signalled; /* c: restarted by cv_signal() */ |
| 184 | u_short l_shlocks; /* !: lockdebug: shared locks held */ |
| 185 | u_short l_exlocks; /* !: lockdebug: excl. locks held */ |
| 186 | u_short l_unused; /* !: unused */ |
| 187 | u_short l_blcnt; /* !: count of kernel_lock held */ |
| 188 | int l_nopreempt; /* !: don't preempt me! */ |
| 189 | u_int l_dopreempt; /* s: kernel preemption pending */ |
| 190 | int l_pflag; /* !: LWP private flags */ |
| 191 | int l_dupfd; /* !: side return from cloning devs XXX */ |
| 192 | const struct sysent * volatile l_sysent;/* !: currently active syscall */ |
| 193 | struct rusage l_ru; /* !: accounting information */ |
| 194 | uint64_t l_pfailtime; /* !: for kernel preemption */ |
| 195 | uintptr_t l_pfailaddr; /* !: for kernel preemption */ |
| 196 | uintptr_t l_pfaillock; /* !: for kernel preemption */ |
| 197 | _TAILQ_HEAD(,struct lockdebug,volatile) l_ld_locks;/* !: locks held by LWP */ |
| 198 | int l_tcgen; /* !: for timecounter removal */ |
| 199 | |
| 200 | /* These are only used by 'options SYSCALL_TIMES'. */ |
| 201 | uint32_t l_syscall_time; /* !: time epoch for current syscall */ |
| 202 | uint64_t *l_syscall_counter; /* !: counter for current process */ |
| 203 | |
| 204 | struct kdtrace_thread *l_dtrace; /* (: DTrace-specific data. */ |
| 205 | }; |
| 206 | |
| 207 | /* |
| 208 | * UAREA_PCB_OFFSET: an offset of PCB structure in the uarea. MD code may |
| 209 | * define it in <machine/proc.h>, to indicate a different uarea layout. |
| 210 | */ |
| 211 | #ifndef UAREA_PCB_OFFSET |
| 212 | #define UAREA_PCB_OFFSET 0 |
| 213 | #endif |
| 214 | |
| 215 | LIST_HEAD(lwplist, lwp); /* A list of LWPs. */ |
| 216 | |
| 217 | #ifdef _KERNEL |
| 218 | extern struct lwplist alllwp; /* List of all LWPs. */ |
| 219 | extern lwp_t lwp0; /* LWP for proc0. */ |
| 220 | extern int maxlwp __read_mostly; /* max number of lwps */ |
| 221 | #ifndef MAXLWP |
| 222 | #define MAXLWP 2048 |
| 223 | #endif |
| 224 | #ifndef __HAVE_CPU_MAXLWP |
| 225 | #define cpu_maxlwp() MAXLWP |
| 226 | #endif |
| 227 | #endif |
| 228 | |
| 229 | #endif /* _KERNEL || _KMEMUSER */ |
| 230 | |
| 231 | /* These flags are kept in l_flag. */ |
| 232 | #define LW_IDLE 0x00000001 /* Idle lwp. */ |
| 233 | #define LW_LWPCTL 0x00000002 /* Adjust lwpctl in userret */ |
| 234 | #define LW_SINTR 0x00000080 /* Sleep is interruptible. */ |
| 235 | #define LW_SYSTEM 0x00000200 /* Kernel thread */ |
| 236 | #define LW_WSUSPEND 0x00020000 /* Suspend before return to user */ |
| 237 | #define LW_BATCH 0x00040000 /* LWP tends to hog CPU */ |
| 238 | #define LW_WCORE 0x00080000 /* Stop for core dump on return to user */ |
| 239 | #define LW_WEXIT 0x00100000 /* Exit before return to user */ |
| 240 | #define LW_PENDSIG 0x01000000 /* Pending signal for us */ |
| 241 | #define LW_CANCELLED 0x02000000 /* tsleep should not sleep */ |
| 242 | #define LW_WREBOOT 0x08000000 /* System is rebooting, please suspend */ |
| 243 | #define LW_UNPARKED 0x10000000 /* Unpark op pending */ |
| 244 | #define LW_RUMP_CLEAR 0x40000000 /* Clear curlwp in RUMP scheduler */ |
| 245 | #define LW_RUMP_QEXIT 0x80000000 /* LWP should exit ASAP */ |
| 246 | |
| 247 | /* The second set of flags is kept in l_pflag. */ |
| 248 | #define LP_KTRACTIVE 0x00000001 /* Executing ktrace operation */ |
| 249 | #define LP_KTRCSW 0x00000002 /* ktrace context switch marker */ |
| 250 | #define LP_KTRCSWUSER 0x00000004 /* ktrace context switch marker */ |
| 251 | #define LP_PIDLID 0x00000008 /* free LID from PID space on exit */ |
| 252 | #define LP_OWEUPC 0x00000010 /* Owe user profiling tick */ |
| 253 | #define LP_MPSAFE 0x00000020 /* Starts life without kernel_lock */ |
| 254 | #define LP_INTR 0x00000040 /* Soft interrupt handler */ |
| 255 | #define LP_SYSCTLWRITE 0x00000080 /* sysctl write lock held */ |
| 256 | #define LP_MUSTJOIN 0x00000100 /* Must join kthread on exit */ |
| 257 | #define LP_VFORKWAIT 0x00000200 /* Waiting at vfork() for a child */ |
| 258 | #define LP_TIMEINTR 0x00010000 /* Time this soft interrupt */ |
| 259 | #define LP_RUNNING 0x20000000 /* Active on a CPU */ |
| 260 | #define LP_BOUND 0x80000000 /* Bound to a CPU */ |
| 261 | |
| 262 | /* The third set is kept in l_prflag. */ |
| 263 | #define LPR_DETACHED 0x00800000 /* Won't be waited for. */ |
| 264 | #define LPR_CRMOD 0x00000100 /* Credentials modified */ |
| 265 | |
| 266 | /* |
| 267 | * Mask indicating that there is "exceptional" work to be done on return to |
| 268 | * user. |
| 269 | */ |
| 270 | #define LW_USERRET \ |
| 271 | (LW_WEXIT | LW_PENDSIG | LW_WREBOOT | LW_WSUSPEND | LW_WCORE | LW_LWPCTL) |
| 272 | |
| 273 | /* |
| 274 | * Status values. |
| 275 | * |
| 276 | * A note about LSRUN and LSONPROC: LSRUN indicates that a process is |
| 277 | * runnable but *not* yet running, i.e. is on a run queue. LSONPROC |
| 278 | * indicates that the process is actually executing on a CPU, i.e. |
| 279 | * it is no longer on a run queue. |
| 280 | */ |
| 281 | #define LSIDL 1 /* Process being created by fork. */ |
| 282 | #define LSRUN 2 /* Currently runnable. */ |
| 283 | #define LSSLEEP 3 /* Sleeping on an address. */ |
| 284 | #define LSSTOP 4 /* Process debugging or suspension. */ |
| 285 | #define LSZOMB 5 /* Awaiting collection by parent. */ |
| 286 | /* unused, for source compatibility with NetBSD 4.0 and earlier. */ |
| 287 | #define LSDEAD 6 /* Process is almost a zombie. */ |
| 288 | #define LSONPROC 7 /* Process is currently on a CPU. */ |
| 289 | #define LSSUSPENDED 8 /* Not running, not signalable. */ |
| 290 | |
| 291 | #if defined(_KERNEL) || defined(_KMEMUSER) |
| 292 | static inline void * |
| 293 | lwp_getpcb(struct lwp *l) |
| 294 | { |
| 295 | |
| 296 | return l->l_addr; |
| 297 | } |
| 298 | #endif /* _KERNEL || _KMEMUSER */ |
| 299 | |
| 300 | #ifdef _KERNEL |
| 301 | #define LWP_CACHE_CREDS(l, p) \ |
| 302 | do { \ |
| 303 | (void)p; \ |
| 304 | if (__predict_false((l)->l_prflag & LPR_CRMOD)) \ |
| 305 | lwp_update_creds(l); \ |
| 306 | } while (/* CONSTCOND */ 0) |
| 307 | |
| 308 | void lwpinit(void); |
| 309 | void lwp0_init(void); |
| 310 | void lwp_sys_init(void); |
| 311 | |
| 312 | void lwp_startup(lwp_t *, lwp_t *); |
| 313 | void startlwp(void *); |
| 314 | |
| 315 | int lwp_locked(lwp_t *, kmutex_t *); |
| 316 | void lwp_setlock(lwp_t *, kmutex_t *); |
| 317 | void lwp_unlock_to(lwp_t *, kmutex_t *); |
| 318 | int lwp_trylock(lwp_t *); |
| 319 | void lwp_addref(lwp_t *); |
| 320 | void lwp_delref(lwp_t *); |
| 321 | void lwp_delref2(lwp_t *); |
| 322 | void lwp_drainrefs(lwp_t *); |
| 323 | bool lwp_alive(lwp_t *); |
| 324 | lwp_t *lwp_find_first(proc_t *); |
| 325 | |
| 326 | int lwp_wait(lwp_t *, lwpid_t, lwpid_t *, bool); |
| 327 | void lwp_continue(lwp_t *); |
| 328 | void lwp_unsleep(lwp_t *, bool); |
| 329 | void lwp_unstop(lwp_t *); |
| 330 | void lwp_exit(lwp_t *); |
| 331 | void lwp_exit_switchaway(lwp_t *) __dead; |
| 332 | int lwp_suspend(lwp_t *, lwp_t *); |
| 333 | int lwp_create1(lwp_t *, const void *, size_t, u_long, lwpid_t *); |
| 334 | void lwp_update_creds(lwp_t *); |
| 335 | void lwp_migrate(lwp_t *, struct cpu_info *); |
| 336 | lwp_t * lwp_find2(pid_t, lwpid_t); |
| 337 | lwp_t * lwp_find(proc_t *, int); |
| 338 | void lwp_userret(lwp_t *); |
| 339 | void lwp_need_userret(lwp_t *); |
| 340 | void lwp_free(lwp_t *, bool, bool); |
| 341 | uint64_t lwp_pctr(void); |
| 342 | int lwp_setprivate(lwp_t *, void *); |
| 343 | int do_lwp_create(lwp_t *, void *, u_long, lwpid_t *); |
| 344 | |
| 345 | void lwpinit_specificdata(void); |
| 346 | int lwp_specific_key_create(specificdata_key_t *, specificdata_dtor_t); |
| 347 | void lwp_specific_key_delete(specificdata_key_t); |
| 348 | void lwp_initspecific(lwp_t *); |
| 349 | void lwp_finispecific(lwp_t *); |
| 350 | void *lwp_getspecific(specificdata_key_t); |
| 351 | #if defined(_LWP_API_PRIVATE) |
| 352 | void *_lwp_getspecific_by_lwp(lwp_t *, specificdata_key_t); |
| 353 | #endif |
| 354 | void lwp_setspecific(specificdata_key_t, void *); |
| 355 | |
| 356 | /* Syscalls. */ |
| 357 | int lwp_park(clockid_t, int, struct timespec *, const void *); |
| 358 | int lwp_unpark(lwpid_t, const void *); |
| 359 | |
| 360 | /* DDB. */ |
| 361 | void lwp_whatis(uintptr_t, void (*)(const char *, ...) __printflike(1, 2)); |
| 362 | |
| 363 | /* |
| 364 | * Lock an LWP. XXX _MODULE |
| 365 | */ |
| 366 | static inline void |
| 367 | lwp_lock(lwp_t *l) |
| 368 | { |
| 369 | kmutex_t *old = l->l_mutex; |
| 370 | |
| 371 | /* |
| 372 | * Note: mutex_spin_enter() will have posted a read barrier. |
| 373 | * Re-test l->l_mutex. If it has changed, we need to try again. |
| 374 | */ |
| 375 | mutex_spin_enter(old); |
| 376 | while (__predict_false(l->l_mutex != old)) { |
| 377 | mutex_spin_exit(old); |
| 378 | old = l->l_mutex; |
| 379 | mutex_spin_enter(old); |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * Unlock an LWP. XXX _MODULE |
| 385 | */ |
| 386 | static inline void |
| 387 | lwp_unlock(lwp_t *l) |
| 388 | { |
| 389 | mutex_spin_exit(l->l_mutex); |
| 390 | } |
| 391 | |
| 392 | static inline void |
| 393 | lwp_changepri(lwp_t *l, pri_t pri) |
| 394 | { |
| 395 | KASSERT(mutex_owned(l->l_mutex)); |
| 396 | |
| 397 | if (l->l_priority == pri) |
| 398 | return; |
| 399 | |
| 400 | (*l->l_syncobj->sobj_changepri)(l, pri); |
| 401 | KASSERT(l->l_priority == pri); |
| 402 | } |
| 403 | |
| 404 | static inline void |
| 405 | lwp_lendpri(lwp_t *l, pri_t pri) |
| 406 | { |
| 407 | KASSERT(mutex_owned(l->l_mutex)); |
| 408 | |
| 409 | (*l->l_syncobj->sobj_lendpri)(l, pri); |
| 410 | KASSERT(l->l_inheritedprio == pri); |
| 411 | } |
| 412 | |
| 413 | static inline pri_t |
| 414 | lwp_eprio(lwp_t *l) |
| 415 | { |
| 416 | pri_t pri; |
| 417 | |
| 418 | pri = l->l_priority; |
| 419 | if ((l->l_flag & LW_SYSTEM) == 0 && l->l_kpriority && pri < PRI_KERNEL) |
| 420 | pri = (pri >> 1) + l->l_kpribase; |
| 421 | return MAX(l->l_auxprio, pri); |
| 422 | } |
| 423 | |
| 424 | int lwp_create(lwp_t *, struct proc *, vaddr_t, int, |
| 425 | void *, size_t, void (*)(void *), void *, lwp_t **, int); |
| 426 | |
| 427 | /* |
| 428 | * XXX _MODULE |
| 429 | * We should provide real stubs for the below that modules can use. |
| 430 | */ |
| 431 | |
| 432 | static inline void |
| 433 | spc_lock(struct cpu_info *ci) |
| 434 | { |
| 435 | mutex_spin_enter(ci->ci_schedstate.spc_mutex); |
| 436 | } |
| 437 | |
| 438 | static inline void |
| 439 | spc_unlock(struct cpu_info *ci) |
| 440 | { |
| 441 | mutex_spin_exit(ci->ci_schedstate.spc_mutex); |
| 442 | } |
| 443 | |
| 444 | static inline void |
| 445 | spc_dlock(struct cpu_info *ci1, struct cpu_info *ci2) |
| 446 | { |
| 447 | struct schedstate_percpu *spc1 = &ci1->ci_schedstate; |
| 448 | struct schedstate_percpu *spc2 = &ci2->ci_schedstate; |
| 449 | |
| 450 | KASSERT(ci1 != ci2); |
| 451 | if (ci1 < ci2) { |
| 452 | mutex_spin_enter(spc1->spc_mutex); |
| 453 | mutex_spin_enter(spc2->spc_mutex); |
| 454 | } else { |
| 455 | mutex_spin_enter(spc2->spc_mutex); |
| 456 | mutex_spin_enter(spc1->spc_mutex); |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | /* |
| 461 | * Allow machine-dependent code to override curlwp in <machine/cpu.h> for |
| 462 | * its own convenience. Otherwise, we declare it as appropriate. |
| 463 | */ |
| 464 | #if !defined(curlwp) |
| 465 | #if defined(MULTIPROCESSOR) |
| 466 | #define curlwp curcpu()->ci_curlwp /* Current running LWP */ |
| 467 | #else |
| 468 | extern struct lwp *curlwp; /* Current running LWP */ |
| 469 | #endif /* MULTIPROCESSOR */ |
| 470 | #endif /* ! curlwp */ |
| 471 | #define curproc (curlwp->l_proc) |
| 472 | |
| 473 | /* |
| 474 | * This provide a way for <machine/cpu.h> to get l_cpu for curlwp before |
| 475 | * struct lwp is defined. |
| 476 | */ |
| 477 | static inline struct cpu_info * |
| 478 | lwp_getcpu(struct lwp *l) |
| 479 | { |
| 480 | return l->l_cpu; |
| 481 | } |
| 482 | |
| 483 | static inline bool |
| 484 | CURCPU_IDLE_P(void) |
| 485 | { |
| 486 | struct cpu_info *ci = curcpu(); |
| 487 | return ci->ci_data.cpu_onproc == ci->ci_data.cpu_idlelwp; |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * Disable and re-enable preemption. Only for low-level kernel |
| 492 | * use. Device drivers and anything that could potentially be |
| 493 | * compiled as a module should use kpreempt_disable() and |
| 494 | * kpreempt_enable(). |
| 495 | */ |
| 496 | static inline void |
| 497 | KPREEMPT_DISABLE(lwp_t *l) |
| 498 | { |
| 499 | |
| 500 | KASSERT(l == curlwp); |
| 501 | l->l_nopreempt++; |
| 502 | __insn_barrier(); |
| 503 | } |
| 504 | |
| 505 | static inline void |
| 506 | KPREEMPT_ENABLE(lwp_t *l) |
| 507 | { |
| 508 | |
| 509 | KASSERT(l == curlwp); |
| 510 | KASSERT(l->l_nopreempt > 0); |
| 511 | __insn_barrier(); |
| 512 | if (--l->l_nopreempt != 0) |
| 513 | return; |
| 514 | __insn_barrier(); |
| 515 | if (__predict_false(l->l_dopreempt)) |
| 516 | kpreempt(0); |
| 517 | __insn_barrier(); |
| 518 | } |
| 519 | |
| 520 | /* For lwp::l_dopreempt */ |
| 521 | #define DOPREEMPT_ACTIVE 0x01 |
| 522 | #define DOPREEMPT_COUNTED 0x02 |
| 523 | |
| 524 | /* |
| 525 | * Prevent curlwp from migrating between CPUs beteen curlwp_bind and |
| 526 | * curlwp_bindx. One use case is psref(9) that has a contract that |
| 527 | * forbids migrations. |
| 528 | */ |
| 529 | static inline int |
| 530 | curlwp_bind(void) |
| 531 | { |
| 532 | int bound; |
| 533 | |
| 534 | bound = curlwp->l_pflag & LP_BOUND; |
| 535 | curlwp->l_pflag |= LP_BOUND; |
| 536 | |
| 537 | return bound; |
| 538 | } |
| 539 | |
| 540 | static inline void |
| 541 | curlwp_bindx(int bound) |
| 542 | { |
| 543 | curlwp->l_pflag ^= bound ^ LP_BOUND; |
| 544 | } |
| 545 | |
| 546 | #endif /* _KERNEL */ |
| 547 | |
| 548 | /* Flags for _lwp_create(), as per Solaris. */ |
| 549 | #define LWP_DETACHED 0x00000040 |
| 550 | #define LWP_SUSPENDED 0x00000080 |
| 551 | |
| 552 | /* Kernel-internal flags for LWP creation. */ |
| 553 | #define LWP_PIDLID 0x40000000 |
| 554 | #define LWP_VFORK 0x80000000 |
| 555 | |
| 556 | #endif /* !_SYS_LWP_H_ */ |
| 557 | |