pthread_int.h revision 1.34.4.3
1 /* $NetBSD: pthread_int.h,v 1.34.4.3 2007/10/19 05:35:38 wrstuden Exp $ */ 2 3 /*- 4 * Copyright (c) 2001,2002,2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Nathan J. Williams. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #ifndef _LIB_PTHREAD_INT_H 40 #define _LIB_PTHREAD_INT_H 41 42 #define PTHREAD__DEBUG 43 #define ERRORCHECK 44 45 #include "pthread_types.h" 46 #include "pthread_queue.h" 47 #include "pthread_debug.h" 48 #include "pthread_md.h" 49 50 #include <sa.h> 51 #include <signal.h> 52 53 #define PTHREAD_KEYS_MAX 256 54 /* 55 * The size of this structure needs to be no larger than struct 56 * __pthread_cleanup_store, defined in pthread.h. 57 */ 58 struct pt_clean_t { 59 PTQ_ENTRY(pt_clean_t) ptc_next; 60 void (*ptc_cleanup)(void *); 61 void *ptc_arg; 62 }; 63 64 struct pt_alarm_t { 65 PTQ_ENTRY(pt_alarm_t) pta_next; 66 pthread_spin_t pta_lock; 67 const struct timespec *pta_time; 68 void (*pta_func)(void *); 69 void *pta_arg; 70 int pta_fired; 71 }; 72 73 /* Private data for pthread_attr_t */ 74 struct pthread_attr_private { 75 char ptap_name[PTHREAD_MAX_NAMELEN_NP]; 76 void *ptap_namearg; 77 void *ptap_stackaddr; 78 size_t ptap_stacksize; 79 size_t ptap_guardsize; 80 }; 81 82 struct __pthread_st { 83 unsigned int pt_magic; 84 /* Identifier, for debugging and for preventing recycling. */ 85 int pt_num; 86 87 int pt_type; /* normal, upcall, or idle */ 88 int pt_state; /* running, blocked, etc. */ 89 pthread_spin_t pt_statelock; /* lock on pt_state */ 90 int pt_flags; /* see PT_FLAG_* below */ 91 pthread_spin_t pt_flaglock; /* lock on pt_flag */ 92 int pt_cancel; /* Deferred cancellation */ 93 int pt_spinlocks; /* Number of spinlocks held. */ 94 int pt_lastlwp; /* LWP/SA number when running or blocked */ 95 int pt_vpid; /* VP number */ 96 int pt_blockgen; /* SA_UPCALL_BLOCKED counter */ 97 int pt_unblockgen; /* SA_UPCALL_UNBLOCKED counter */ 98 99 int pt_errno; /* Thread-specific errno. */ 100 101 /* Entry on the run queue */ 102 PTQ_ENTRY(__pthread_st) pt_runq; 103 /* Entry on the list of all threads */ 104 PTQ_ENTRY(__pthread_st) pt_allq; 105 /* Entry on the sleep queue (xxx should be same as run queue?) */ 106 PTQ_ENTRY(__pthread_st) pt_sleep; 107 /* Object we're sleeping on */ 108 void *pt_sleepobj; 109 /* Queue we're sleeping on */ 110 struct pthread_queue_t *pt_sleepq; 111 /* Lock protecting that queue */ 112 pthread_spin_t *pt_sleeplock; 113 114 stack_t pt_stack; /* Our stack */ 115 ucontext_t *pt_uc; /* Saved context when we're stopped */ 116 ucontext_t *pt_trapuc; /* Kernel-saved context */ 117 ucontext_t *__pt_blockuc; /* Kernel-saved context when blocked */ 118 119 sigset_t pt_sigmask; /* Signals we won't take. */ 120 sigset_t pt_siglist; /* Signals pending for us. */ 121 sigset_t pt_sigblocked; /* Signals delivered while blocked. */ 122 sigset_t *pt_sigwait; /* Signals waited for in sigwait */ 123 siginfo_t *pt_wsig; 124 pthread_spin_t pt_siglock; /* Lock on above */ 125 126 void * pt_exitval; /* Read by pthread_join() */ 127 128 /* Stack of cancellation cleanup handlers and their arguments */ 129 PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; 130 131 /* Thread's name, set by the application. */ 132 char* pt_name; 133 134 /* Other threads trying to pthread_join() us. */ 135 struct pthread_queue_t pt_joiners; 136 /* Lock for above, and for changing pt_state to ZOMBIE or DEAD, 137 * and for setting the DETACHED flag. Also protects pt_name. 138 */ 139 pthread_spin_t pt_join_lock; 140 141 /* Thread we were going to switch to before we were preempted 142 * ourselves. Will be used by the upcall that's continuing us. 143 */ 144 pthread_t pt_switchto; 145 ucontext_t* pt_switchtouc; 146 147 /* Threads that are preempted with spinlocks held will be 148 * continued until they unlock their spinlock. When they do 149 * so, they should jump ship to the thread pointed to by 150 * pt_next. 151 */ 152 pthread_t pt_next; 153 154 /* The upcall that is continuing this thread */ 155 pthread_t pt_parent; 156 157 /* A queue lock that this thread held while trying to 158 * context switch to another process. 159 */ 160 pthread_spin_t* pt_heldlock; 161 162 /* Upcall stack information shared between kernel and 163 * userland. 164 */ 165 struct sa_stackinfo_t pt_stackinfo; 166 167 /* Thread-specific data */ 168 void* pt_specific[PTHREAD_KEYS_MAX]; 169 170 #ifdef PTHREAD__DEBUG 171 int blocks; 172 int preempts; 173 int rescheds; 174 #endif 175 }; 176 177 /* 178 * Thread locking hierarcy. In order to avoid deadlocks when concurrency 179 * is enabled, locks mus be aquired in a consistent order. Locks are 180 * divided into groups, and no lock in a "higher" group may be taken while 181 * holding a lock in a "lower" group. Also, only one lock in a group may 182 * be taken at once, as otherwise the locks need to be listed separately 183 * to avoid an issue between them. Some locks listed are per-thread 184 * and some are global. A thread may take some per-thread locks on itself 185 * and per-thread locks on other threads, but any such locking must still 186 * respect the hierarcy. All per-thread locks of a given type are considered 187 * in the same group and thus only one may be taken at once by a given thread. 188 * It is believed that the current code never tries to take the same lock 189 * in more than one thread at once. 190 * 191 * "Top" group: pt_join_lock, pthread__deadqueue_lock, &barrier->ptb_lock, 192 * cond->ptc_lock, mutex->ptm_interlock, rwlock->ptr_interlock, 193 * pt_sigsuspended_lock, pt_sigwaiting_lock, pt_nanosleep_lock, 194 * pthread__allqueue_lock 195 * 196 * Group 2: pt_statelock 197 * 198 * Group 3: pt_siglock, pthread_alarmqlock 199 * 200 * Group 4: pt_flag_lock, pthread__runqueue_lock 201 * 202 * Group 5: alarm->pta_lock -- all locked in acending time order. 203 */ 204 205 struct pthread_lock_ops { 206 void (*plo_init)(__cpu_simple_lock_t *); 207 int (*plo_try)(__cpu_simple_lock_t *); 208 void (*plo_unlock)(__cpu_simple_lock_t *); 209 }; 210 211 /* Thread types */ 212 #define PT_THREAD_NORMAL 1 213 #define PT_THREAD_UPCALL 2 214 #define PT_THREAD_IDLE 3 215 216 /* Thread states */ 217 #define PT_STATE_RUNNING 1 218 #define PT_STATE_RUNNABLE 2 219 #define _PT_STATE_BLOCKED_SYS 3 /* Only used in libpthread_dbg */ 220 #define PT_STATE_BLOCKED_QUEUE 4 221 #define PT_STATE_ZOMBIE 5 222 #define PT_STATE_DEAD 6 223 #define PT_STATE_SUSPENDED 7 224 225 /* Flag values */ 226 227 #define PT_FLAG_DETACHED 0x0001 228 #define PT_FLAG_IDLED 0x0002 229 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ 230 #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ 231 #define PT_FLAG_CS_PENDING 0x0010 232 #define PT_FLAG_SIGDEFERRED 0x0020 /* There are signals to take */ 233 #define PT_FLAG_SCOPE_SYSTEM 0x0040 234 #define PT_FLAG_EXPLICIT_SCHED 0x0080 235 #define PT_FLAG_SUSPENDED 0x0100 /* In the suspended queue */ 236 #define PT_FLAG_SIGNALED 0x0200 237 238 #define PT_MAGIC 0x11110001 239 #define PT_DEAD 0xDEAD0001 240 241 #define PT_ATTR_MAGIC 0x22220002 242 #define PT_ATTR_DEAD 0xDEAD0002 243 244 #ifdef PT_FIXEDSTACKSIZE_LG 245 246 #define PT_STACKSIZE_LG PT_FIXEDSTACKSIZE_LG 247 #define PT_STACKSIZE (1<<(PT_STACKSIZE_LG)) 248 #define PT_STACKMASK (PT_STACKSIZE-1) 249 250 #else /* PT_FIXEDSTACKSIZE_LG */ 251 252 extern int pthread_stacksize_lg; 253 extern size_t pthread_stacksize; 254 extern vaddr_t pthread_stackmask; 255 256 #define PT_STACKSIZE_LG pthread_stacksize_lg 257 #define PT_STACKSIZE pthread_stacksize 258 #define PT_STACKMASK pthread_stackmask 259 260 #endif /* PT_FIXEDSTACKSIZE_LG */ 261 262 263 #define PT_UPCALLSTACKS 16 264 265 #define PT_ALARMTIMER_MAGIC 0x88880010 266 #define PT_RRTIMER_MAGIC 0x88880020 267 #define NIDLETHREADS 4 268 269 /* Flag to be used in a ucontext_t's uc_flags indicating that 270 * the saved register state is "user" state only, not full 271 * trap state. 272 */ 273 #define _UC_USER_BIT 30 274 #define _UC_USER (1LU << _UC_USER_BIT) 275 276 void pthread_init(void) __attribute__ ((__constructor__)); 277 278 /* Utility functions */ 279 280 /* Set up/clean up a thread's basic state. */ 281 void pthread__initthread(pthread_t self, pthread_t t); 282 /* Get offset from stack start to struct sa_stackinfo */ 283 ssize_t pthread__stackinfo_offset(void); 284 285 /* Go do something else. Don't go back on the run queue */ 286 void pthread__block(pthread_t self, pthread_spin_t* queuelock); 287 /* Put a thread back on the suspended queue */ 288 void pthread__suspend(pthread_t self, pthread_t thread); 289 /* Put a thread back on the run queue */ 290 void pthread__sched(pthread_t self, pthread_t thread); 291 void pthread__sched_sleepers(pthread_t self, struct pthread_queue_t *threadq); 292 void pthread__sched_idle(pthread_t self, pthread_t thread); 293 void pthread__sched_idle2(pthread_t self); 294 295 void pthread__sched_bulk(pthread_t self, pthread_t qhead); 296 297 void pthread__idle(void); 298 299 /* Get the next thread */ 300 pthread_t pthread__next(pthread_t self); 301 302 int pthread__stackalloc(pthread_t *t); 303 void pthread__initmain(pthread_t *t); 304 305 void pthread__sa_start(void); 306 void pthread__sa_recycle(pthread_t old, pthread_t new); 307 void pthread__setconcurrency(int); 308 309 /* Alarm code */ 310 void pthread__alarm_init(void); 311 void pthread__alarm_add(pthread_t, struct pt_alarm_t *, 312 const struct timespec *, void (*)(void *), void *); 313 void pthread__alarm_del(pthread_t, struct pt_alarm_t *); 314 int pthread__alarm_fired(struct pt_alarm_t *); 315 void pthread__alarm_process(pthread_t self, void *arg); 316 317 /* Internal locking primitives */ 318 void pthread__lockprim_init(int ncpu); 319 void pthread_lockinit(pthread_spin_t *lock); 320 void pthread_spinlock(pthread_t thread, pthread_spin_t *lock); 321 int pthread_spintrylock(pthread_t thread, pthread_spin_t *lock); 322 void pthread_spinunlock(pthread_t thread, pthread_spin_t *lock); 323 324 extern const struct pthread_lock_ops *pthread__lock_ops; 325 326 #define pthread__simple_lock_init(alp) (*pthread__lock_ops->plo_init)(alp) 327 #define pthread__simple_lock_try(alp) (*pthread__lock_ops->plo_try)(alp) 328 #define pthread__simple_unlock(alp) (*pthread__lock_ops->plo_unlock)(alp) 329 330 #ifndef _getcontext_u 331 int _getcontext_u(ucontext_t *); 332 #endif 333 #ifndef _setcontext_u 334 int _setcontext_u(const ucontext_t *); 335 #endif 336 #ifndef _swapcontext_u 337 int _swapcontext_u(ucontext_t *, const ucontext_t *); 338 #endif 339 340 void pthread__testcancel(pthread_t self); 341 int pthread__find(pthread_t self, pthread_t target); 342 343 #ifndef PTHREAD_MD_INIT 344 #define PTHREAD_MD_INIT 345 #endif 346 347 #ifndef _INITCONTEXT_U_MD 348 #define _INITCONTEXT_U_MD(ucp) 349 #endif 350 351 #define _INITCONTEXT_U(ucp) do { \ 352 (ucp)->uc_flags = _UC_CPU | _UC_STACK; \ 353 _INITCONTEXT_U_MD(ucp) \ 354 } while (/*CONSTCOND*/0) 355 356 #ifdef PTHREAD_MACHINE_HAS_ID_REGISTER 357 #define pthread__id(reg) (reg) 358 #else 359 /* Stack location of pointer to a particular thread */ 360 #define pthread__id(sp) \ 361 ((pthread_t) (((vaddr_t)(sp)) & ~PT_STACKMASK)) 362 363 #define pthread__id_reg() pthread__sp() 364 #endif 365 366 #define pthread__self() (pthread__id(pthread__id_reg())) 367 368 #define pthread__abort() \ 369 pthread__assertfunc(__FILE__, __LINE__, __func__, "unreachable") 370 371 #define pthread__assert(e) do { \ 372 if (__predict_false(!(e))) \ 373 pthread__assertfunc(__FILE__, __LINE__, __func__, #e); \ 374 } while (/*CONSTCOND*/0) 375 376 #define pthread__error(err, msg, e) do { \ 377 if (__predict_false(!(e))) { \ 378 pthread__errorfunc(__FILE__, __LINE__, __func__, msg); \ 379 return (err); \ 380 } \ 381 } while (/*CONSTCOND*/0) 382 383 /* 384 * You must hold t->pt_statelock when making this check. 385 */ 386 #define pthread_check_defsig(t) \ 387 __predict_false((t)->pt_flags & PT_FLAG_SIGDEFERRED) 388 389 390 391 /* These three routines are defined in processor-specific code. */ 392 void pthread__upcall_switch(pthread_t self, pthread_t next); 393 void pthread__switch(pthread_t self, pthread_t next); 394 void pthread__locked_switch(pthread_t self, pthread_t next, 395 pthread_spin_t *lock); 396 397 void pthread__signal_init(void); 398 void pthread__signal_start(void); 399 400 void pthread__signal(pthread_t self, pthread_t t, siginfo_t *si); 401 void pthread__deliver_signal(pthread_t self, pthread_t t, siginfo_t *si); 402 void pthread__signal_deferred(pthread_t self, pthread_t t); 403 404 void pthread__destroy_tsd(pthread_t self); 405 void pthread__assertfunc(const char *file, int line, const char *function, 406 const char *expr); 407 void pthread__errorfunc(const char *file, int line, const char *function, 408 const char *msg); 409 410 #endif /* _LIB_PTHREAD_INT_H */ 411
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