Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/mutex.h
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1 /*- 2 * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. Berkeley Software Design Inc's name may not be used to endorse or 13 * promote products derived from this software without specific prior 14 * written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $ 29 * $FreeBSD: releng/11.1/sys/sys/mutex.h 315394 2017-03-16 08:29:09Z mjg $ 30 */ 31 32 #ifndef _SYS_MUTEX_H_ 33 #define _SYS_MUTEX_H_ 34 35 #include <sys/queue.h> 36 #include <sys/_lock.h> 37 #include <sys/_mutex.h> 38 39 #ifdef _KERNEL 40 #include <sys/pcpu.h> 41 #include <sys/lock_profile.h> 42 #include <sys/lockstat.h> 43 #include <machine/atomic.h> 44 #include <machine/cpufunc.h> 45 46 /* 47 * Mutex types and options passed to mtx_init(). MTX_QUIET and MTX_DUPOK 48 * can also be passed in. 49 */ 50 #define MTX_DEF 0x00000000 /* DEFAULT (sleep) lock */ 51 #define MTX_SPIN 0x00000001 /* Spin lock (disables interrupts) */ 52 #define MTX_RECURSE 0x00000004 /* Option: lock allowed to recurse */ 53 #define MTX_NOWITNESS 0x00000008 /* Don't do any witness checking. */ 54 #define MTX_NOPROFILE 0x00000020 /* Don't profile this lock */ 55 #define MTX_NEW 0x00000040 /* Don't check for double-init */ 56 57 /* 58 * Option flags passed to certain lock/unlock routines, through the use 59 * of corresponding mtx_{lock,unlock}_flags() interface macros. 60 */ 61 #define MTX_QUIET LOP_QUIET /* Don't log a mutex event */ 62 #define MTX_DUPOK LOP_DUPOK /* Don't log a duplicate acquire */ 63 64 /* 65 * State bits kept in mutex->mtx_lock, for the DEFAULT lock type. None of this, 66 * with the exception of MTX_UNOWNED, applies to spin locks. 67 */ 68 #define MTX_RECURSED 0x00000001 /* lock recursed (for MTX_DEF only) */ 69 #define MTX_CONTESTED 0x00000002 /* lock contested (for MTX_DEF only) */ 70 #define MTX_UNOWNED 0x00000004 /* Cookie for free mutex */ 71 #define MTX_FLAGMASK (MTX_RECURSED | MTX_CONTESTED | MTX_UNOWNED) 72 73 /* 74 * Value stored in mutex->mtx_lock to denote a destroyed mutex. 75 */ 76 #define MTX_DESTROYED (MTX_CONTESTED | MTX_UNOWNED) 77 78 /* 79 * Prototypes 80 * 81 * NOTE: Functions prepended with `_' (underscore) are exported to other parts 82 * of the kernel via macros, thus allowing us to use the cpp LOCK_FILE 83 * and LOCK_LINE or for hiding the lock cookie crunching to the 84 * consumers. These functions should not be called directly by any 85 * code using the API. Their macros cover their functionality. 86 * Functions with a `_' suffix are the entrypoint for the common 87 * KPI covering both compat shims and fast path case. These can be 88 * used by consumers willing to pass options, file and line 89 * informations, in an option-independent way. 90 * 91 * [See below for descriptions] 92 * 93 */ 94 void _mtx_init(volatile uintptr_t *c, const char *name, const char *type, 95 int opts); 96 void _mtx_destroy(volatile uintptr_t *c); 97 void mtx_sysinit(void *arg); 98 int _mtx_trylock_flags_(volatile uintptr_t *c, int opts, const char *file, 99 int line); 100 void mutex_init(void); 101 #if LOCK_DEBUG > 0 102 void __mtx_lock_sleep(volatile uintptr_t *c, uintptr_t v, uintptr_t tid, 103 int opts, const char *file, int line); 104 void __mtx_unlock_sleep(volatile uintptr_t *c, int opts, const char *file, 105 int line); 106 #else 107 void __mtx_lock_sleep(volatile uintptr_t *c, uintptr_t v, uintptr_t tid); 108 void __mtx_unlock_sleep(volatile uintptr_t *c); 109 #endif 110 111 #ifdef SMP 112 void _mtx_lock_spin_cookie(volatile uintptr_t *c, uintptr_t v, uintptr_t tid, 113 int opts, const char *file, int line); 114 #endif 115 void __mtx_lock_flags(volatile uintptr_t *c, int opts, const char *file, 116 int line); 117 void __mtx_unlock_flags(volatile uintptr_t *c, int opts, const char *file, 118 int line); 119 void __mtx_lock_spin_flags(volatile uintptr_t *c, int opts, const char *file, 120 int line); 121 int __mtx_trylock_spin_flags(volatile uintptr_t *c, int opts, 122 const char *file, int line); 123 void __mtx_unlock_spin_flags(volatile uintptr_t *c, int opts, 124 const char *file, int line); 125 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 126 void __mtx_assert(const volatile uintptr_t *c, int what, const char *file, 127 int line); 128 #endif 129 void thread_lock_flags_(struct thread *, int, const char *, int); 130 131 #define thread_lock(tdp) \ 132 thread_lock_flags_((tdp), 0, __FILE__, __LINE__) 133 #define thread_lock_flags(tdp, opt) \ 134 thread_lock_flags_((tdp), (opt), __FILE__, __LINE__) 135 #define thread_unlock(tdp) \ 136 mtx_unlock_spin((tdp)->td_lock) 137 138 /* 139 * Top-level macros to provide lock cookie once the actual mtx is passed. 140 * They will also prevent passing a malformed object to the mtx KPI by 141 * failing compilation as the mtx_lock reserved member will not be found. 142 */ 143 #define mtx_init(m, n, t, o) \ 144 _mtx_init(&(m)->mtx_lock, n, t, o) 145 #define mtx_destroy(m) \ 146 _mtx_destroy(&(m)->mtx_lock) 147 #define mtx_trylock_flags_(m, o, f, l) \ 148 _mtx_trylock_flags_(&(m)->mtx_lock, o, f, l) 149 #if LOCK_DEBUG > 0 150 #define _mtx_lock_sleep(m, v, t, o, f, l) \ 151 __mtx_lock_sleep(&(m)->mtx_lock, v, t, o, f, l) 152 #define _mtx_unlock_sleep(m, o, f, l) \ 153 __mtx_unlock_sleep(&(m)->mtx_lock, o, f, l) 154 #else 155 #define _mtx_lock_sleep(m, v, t, o, f, l) \ 156 __mtx_lock_sleep(&(m)->mtx_lock, v, t) 157 #define _mtx_unlock_sleep(m, o, f, l) \ 158 __mtx_unlock_sleep(&(m)->mtx_lock) 159 #endif 160 #ifdef SMP 161 #define _mtx_lock_spin(m, v, t, o, f, l) \ 162 _mtx_lock_spin_cookie(&(m)->mtx_lock, v, t, o, f, l) 163 #endif 164 #define _mtx_lock_flags(m, o, f, l) \ 165 __mtx_lock_flags(&(m)->mtx_lock, o, f, l) 166 #define _mtx_unlock_flags(m, o, f, l) \ 167 __mtx_unlock_flags(&(m)->mtx_lock, o, f, l) 168 #define _mtx_lock_spin_flags(m, o, f, l) \ 169 __mtx_lock_spin_flags(&(m)->mtx_lock, o, f, l) 170 #define _mtx_trylock_spin_flags(m, o, f, l) \ 171 __mtx_trylock_spin_flags(&(m)->mtx_lock, o, f, l) 172 #define _mtx_unlock_spin_flags(m, o, f, l) \ 173 __mtx_unlock_spin_flags(&(m)->mtx_lock, o, f, l) 174 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 175 #define _mtx_assert(m, w, f, l) \ 176 __mtx_assert(&(m)->mtx_lock, w, f, l) 177 #endif 178 179 #define mtx_recurse lock_object.lo_data 180 181 /* Very simple operations on mtx_lock. */ 182 183 /* Try to obtain mtx_lock once. */ 184 #define _mtx_obtain_lock(mp, tid) \ 185 atomic_cmpset_acq_ptr(&(mp)->mtx_lock, MTX_UNOWNED, (tid)) 186 187 #define _mtx_obtain_lock_fetch(mp, vp, tid) \ 188 atomic_fcmpset_acq_ptr(&(mp)->mtx_lock, vp, (tid)) 189 190 /* Try to release mtx_lock if it is unrecursed and uncontested. */ 191 #define _mtx_release_lock(mp, tid) \ 192 atomic_cmpset_rel_ptr(&(mp)->mtx_lock, (tid), MTX_UNOWNED) 193 194 /* Release mtx_lock quickly, assuming we own it. */ 195 #define _mtx_release_lock_quick(mp) \ 196 atomic_store_rel_ptr(&(mp)->mtx_lock, MTX_UNOWNED) 197 198 /* 199 * Full lock operations that are suitable to be inlined in non-debug 200 * kernels. If the lock cannot be acquired or released trivially then 201 * the work is deferred to another function. 202 */ 203 204 /* Lock a normal mutex. */ 205 #define __mtx_lock(mp, tid, opts, file, line) do { \ 206 uintptr_t _tid = (uintptr_t)(tid); \ 207 uintptr_t _v = MTX_UNOWNED; \ 208 \ 209 if (__predict_false(LOCKSTAT_PROFILE_ENABLED(adaptive__acquire) ||\ 210 !_mtx_obtain_lock_fetch((mp), &_v, _tid))) \ 211 _mtx_lock_sleep((mp), _v, _tid, (opts), (file), (line));\ 212 } while (0) 213 214 /* 215 * Lock a spin mutex. For spinlocks, we handle recursion inline (it 216 * turns out that function calls can be significantly expensive on 217 * some architectures). Since spin locks are not _too_ common, 218 * inlining this code is not too big a deal. 219 */ 220 #ifdef SMP 221 #define __mtx_lock_spin(mp, tid, opts, file, line) do { \ 222 uintptr_t _tid = (uintptr_t)(tid); \ 223 uintptr_t _v = MTX_UNOWNED; \ 224 \ 225 spinlock_enter(); \ 226 if (!_mtx_obtain_lock_fetch((mp), &_v, _tid)) \ 227 _mtx_lock_spin((mp), _v, _tid, (opts), (file), (line)); \ 228 else \ 229 LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(spin__acquire, \ 230 mp, 0, 0, file, line); \ 231 } while (0) 232 #define __mtx_trylock_spin(mp, tid, opts, file, line) __extension__ ({ \ 233 uintptr_t _tid = (uintptr_t)(tid); \ 234 int _ret; \ 235 \ 236 spinlock_enter(); \ 237 if (((mp)->mtx_lock != MTX_UNOWNED || !_mtx_obtain_lock((mp), _tid))) {\ 238 spinlock_exit(); \ 239 _ret = 0; \ 240 } else { \ 241 LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(spin__acquire, \ 242 mp, 0, 0, file, line); \ 243 _ret = 1; \ 244 } \ 245 _ret; \ 246 }) 247 #else /* SMP */ 248 #define __mtx_lock_spin(mp, tid, opts, file, line) do { \ 249 uintptr_t _tid = (uintptr_t)(tid); \ 250 \ 251 spinlock_enter(); \ 252 if ((mp)->mtx_lock == _tid) \ 253 (mp)->mtx_recurse++; \ 254 else { \ 255 KASSERT((mp)->mtx_lock == MTX_UNOWNED, ("corrupt spinlock")); \ 256 (mp)->mtx_lock = _tid; \ 257 } \ 258 } while (0) 259 #define __mtx_trylock_spin(mp, tid, opts, file, line) __extension__ ({ \ 260 uintptr_t _tid = (uintptr_t)(tid); \ 261 int _ret; \ 262 \ 263 spinlock_enter(); \ 264 if ((mp)->mtx_lock != MTX_UNOWNED) { \ 265 spinlock_exit(); \ 266 _ret = 0; \ 267 } else { \ 268 (mp)->mtx_lock = _tid; \ 269 _ret = 1; \ 270 } \ 271 _ret; \ 272 }) 273 #endif /* SMP */ 274 275 /* Unlock a normal mutex. */ 276 #define __mtx_unlock(mp, tid, opts, file, line) do { \ 277 uintptr_t _tid = (uintptr_t)(tid); \ 278 \ 279 if (__predict_false(LOCKSTAT_PROFILE_ENABLED(adaptive__release) ||\ 280 !_mtx_release_lock((mp), _tid))) \ 281 _mtx_unlock_sleep((mp), (opts), (file), (line)); \ 282 } while (0) 283 284 /* 285 * Unlock a spin mutex. For spinlocks, we can handle everything 286 * inline, as it's pretty simple and a function call would be too 287 * expensive (at least on some architectures). Since spin locks are 288 * not _too_ common, inlining this code is not too big a deal. 289 * 290 * Since we always perform a spinlock_enter() when attempting to acquire a 291 * spin lock, we need to always perform a matching spinlock_exit() when 292 * releasing a spin lock. This includes the recursion cases. 293 */ 294 #ifdef SMP 295 #define __mtx_unlock_spin(mp) do { \ 296 if (mtx_recursed((mp))) \ 297 (mp)->mtx_recurse--; \ 298 else { \ 299 LOCKSTAT_PROFILE_RELEASE_LOCK(spin__release, mp); \ 300 _mtx_release_lock_quick((mp)); \ 301 } \ 302 spinlock_exit(); \ 303 } while (0) 304 #else /* SMP */ 305 #define __mtx_unlock_spin(mp) do { \ 306 if (mtx_recursed((mp))) \ 307 (mp)->mtx_recurse--; \ 308 else { \ 309 LOCKSTAT_PROFILE_RELEASE_LOCK(spin__release, mp); \ 310 (mp)->mtx_lock = MTX_UNOWNED; \ 311 } \ 312 spinlock_exit(); \ 313 } while (0) 314 #endif /* SMP */ 315 316 /* 317 * Exported lock manipulation interface. 318 * 319 * mtx_lock(m) locks MTX_DEF mutex `m' 320 * 321 * mtx_lock_spin(m) locks MTX_SPIN mutex `m' 322 * 323 * mtx_unlock(m) unlocks MTX_DEF mutex `m' 324 * 325 * mtx_unlock_spin(m) unlocks MTX_SPIN mutex `m' 326 * 327 * mtx_lock_spin_flags(m, opts) and mtx_lock_flags(m, opts) locks mutex `m' 328 * and passes option flags `opts' to the "hard" function, if required. 329 * With these routines, it is possible to pass flags such as MTX_QUIET 330 * to the appropriate lock manipulation routines. 331 * 332 * mtx_trylock(m) attempts to acquire MTX_DEF mutex `m' but doesn't sleep if 333 * it cannot. Rather, it returns 0 on failure and non-zero on success. 334 * It does NOT handle recursion as we assume that if a caller is properly 335 * using this part of the interface, he will know that the lock in question 336 * is _not_ recursed. 337 * 338 * mtx_trylock_flags(m, opts) is used the same way as mtx_trylock() but accepts 339 * relevant option flags `opts.' 340 * 341 * mtx_trylock_spin(m) attempts to acquire MTX_SPIN mutex `m' but doesn't 342 * spin if it cannot. Rather, it returns 0 on failure and non-zero on 343 * success. It always returns failure for recursed lock attempts. 344 * 345 * mtx_initialized(m) returns non-zero if the lock `m' has been initialized. 346 * 347 * mtx_owned(m) returns non-zero if the current thread owns the lock `m' 348 * 349 * mtx_recursed(m) returns non-zero if the lock `m' is presently recursed. 350 */ 351 #define mtx_lock(m) mtx_lock_flags((m), 0) 352 #define mtx_lock_spin(m) mtx_lock_spin_flags((m), 0) 353 #define mtx_trylock(m) mtx_trylock_flags((m), 0) 354 #define mtx_trylock_spin(m) mtx_trylock_spin_flags((m), 0) 355 #define mtx_unlock(m) mtx_unlock_flags((m), 0) 356 #define mtx_unlock_spin(m) mtx_unlock_spin_flags((m), 0) 357 358 struct mtx_pool; 359 360 struct mtx_pool *mtx_pool_create(const char *mtx_name, int pool_size, int opts); 361 void mtx_pool_destroy(struct mtx_pool **poolp); 362 struct mtx *mtx_pool_find(struct mtx_pool *pool, void *ptr); 363 struct mtx *mtx_pool_alloc(struct mtx_pool *pool); 364 #define mtx_pool_lock(pool, ptr) \ 365 mtx_lock(mtx_pool_find((pool), (ptr))) 366 #define mtx_pool_lock_spin(pool, ptr) \ 367 mtx_lock_spin(mtx_pool_find((pool), (ptr))) 368 #define mtx_pool_unlock(pool, ptr) \ 369 mtx_unlock(mtx_pool_find((pool), (ptr))) 370 #define mtx_pool_unlock_spin(pool, ptr) \ 371 mtx_unlock_spin(mtx_pool_find((pool), (ptr))) 372 373 /* 374 * mtxpool_sleep is a general purpose pool of sleep mutexes. 375 */ 376 extern struct mtx_pool *mtxpool_sleep; 377 378 #ifndef LOCK_DEBUG 379 #error LOCK_DEBUG not defined, include <sys/lock.h> before <sys/mutex.h> 380 #endif 381 #if LOCK_DEBUG > 0 || defined(MUTEX_NOINLINE) 382 #define mtx_lock_flags_(m, opts, file, line) \ 383 _mtx_lock_flags((m), (opts), (file), (line)) 384 #define mtx_unlock_flags_(m, opts, file, line) \ 385 _mtx_unlock_flags((m), (opts), (file), (line)) 386 #define mtx_lock_spin_flags_(m, opts, file, line) \ 387 _mtx_lock_spin_flags((m), (opts), (file), (line)) 388 #define mtx_trylock_spin_flags_(m, opts, file, line) \ 389 _mtx_trylock_spin_flags((m), (opts), (file), (line)) 390 #define mtx_unlock_spin_flags_(m, opts, file, line) \ 391 _mtx_unlock_spin_flags((m), (opts), (file), (line)) 392 #else /* LOCK_DEBUG == 0 && !MUTEX_NOINLINE */ 393 #define mtx_lock_flags_(m, opts, file, line) \ 394 __mtx_lock((m), curthread, (opts), (file), (line)) 395 #define mtx_unlock_flags_(m, opts, file, line) \ 396 __mtx_unlock((m), curthread, (opts), (file), (line)) 397 #define mtx_lock_spin_flags_(m, opts, file, line) \ 398 __mtx_lock_spin((m), curthread, (opts), (file), (line)) 399 #define mtx_trylock_spin_flags_(m, opts, file, line) \ 400 __mtx_trylock_spin((m), curthread, (opts), (file), (line)) 401 #define mtx_unlock_spin_flags_(m, opts, file, line) \ 402 __mtx_unlock_spin((m)) 403 #endif /* LOCK_DEBUG > 0 || MUTEX_NOINLINE */ 404 405 #ifdef INVARIANTS 406 #define mtx_assert_(m, what, file, line) \ 407 _mtx_assert((m), (what), (file), (line)) 408 409 #define GIANT_REQUIRED mtx_assert_(&Giant, MA_OWNED, __FILE__, __LINE__) 410 411 #else /* INVARIANTS */ 412 #define mtx_assert_(m, what, file, line) (void)0 413 #define GIANT_REQUIRED 414 #endif /* INVARIANTS */ 415 416 #define mtx_lock_flags(m, opts) \ 417 mtx_lock_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 418 #define mtx_unlock_flags(m, opts) \ 419 mtx_unlock_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 420 #define mtx_lock_spin_flags(m, opts) \ 421 mtx_lock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 422 #define mtx_unlock_spin_flags(m, opts) \ 423 mtx_unlock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 424 #define mtx_trylock_flags(m, opts) \ 425 mtx_trylock_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 426 #define mtx_trylock_spin_flags(m, opts) \ 427 mtx_trylock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 428 #define mtx_assert(m, what) \ 429 mtx_assert_((m), (what), __FILE__, __LINE__) 430 431 #define mtx_sleep(chan, mtx, pri, wmesg, timo) \ 432 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), \ 433 tick_sbt * (timo), 0, C_HARDCLOCK) 434 435 #define MTX_READ_VALUE(m) ((m)->mtx_lock) 436 437 #define mtx_initialized(m) lock_initialized(&(m)->lock_object) 438 439 #define lv_mtx_owner(v) ((struct thread *)((v) & ~MTX_FLAGMASK)) 440 441 #define mtx_owner(m) lv_mtx_owner(MTX_READ_VALUE(m)) 442 443 #define mtx_owned(m) (mtx_owner(m) == curthread) 444 445 #define mtx_recursed(m) ((m)->mtx_recurse != 0) 446 447 #define mtx_name(m) ((m)->lock_object.lo_name) 448 449 /* 450 * Global locks. 451 */ 452 extern struct mtx Giant; 453 extern struct mtx blocked_lock; 454 455 /* 456 * Giant lock manipulation and clean exit macros. 457 * Used to replace return with an exit Giant and return. 458 * 459 * Note that DROP_GIANT*() needs to be paired with PICKUP_GIANT() 460 * The #ifndef is to allow lint-like tools to redefine DROP_GIANT. 461 */ 462 #ifndef DROP_GIANT 463 #define DROP_GIANT() \ 464 do { \ 465 int _giantcnt = 0; \ 466 WITNESS_SAVE_DECL(Giant); \ 467 \ 468 if (mtx_owned(&Giant)) { \ 469 WITNESS_SAVE(&Giant.lock_object, Giant); \ 470 for (_giantcnt = 0; mtx_owned(&Giant) && \ 471 !SCHEDULER_STOPPED(); _giantcnt++) \ 472 mtx_unlock(&Giant); \ 473 } 474 475 #define PICKUP_GIANT() \ 476 PARTIAL_PICKUP_GIANT(); \ 477 } while (0) 478 479 #define PARTIAL_PICKUP_GIANT() \ 480 mtx_assert(&Giant, MA_NOTOWNED); \ 481 if (_giantcnt > 0) { \ 482 while (_giantcnt--) \ 483 mtx_lock(&Giant); \ 484 WITNESS_RESTORE(&Giant.lock_object, Giant); \ 485 } 486 #endif 487 488 struct mtx_args { 489 void *ma_mtx; 490 const char *ma_desc; 491 int ma_opts; 492 }; 493 494 #define MTX_SYSINIT(name, mtx, desc, opts) \ 495 static struct mtx_args name##_args = { \ 496 (mtx), \ 497 (desc), \ 498 (opts) \ 499 }; \ 500 SYSINIT(name##_mtx_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \ 501 mtx_sysinit, &name##_args); \ 502 SYSUNINIT(name##_mtx_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \ 503 _mtx_destroy, __DEVOLATILE(void *, &(mtx)->mtx_lock)) 504 505 /* 506 * The INVARIANTS-enabled mtx_assert() functionality. 507 * 508 * The constants need to be defined for INVARIANT_SUPPORT infrastructure 509 * support as _mtx_assert() itself uses them and the latter implies that 510 * _mtx_assert() must build. 511 */ 512 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 513 #define MA_OWNED LA_XLOCKED 514 #define MA_NOTOWNED LA_UNLOCKED 515 #define MA_RECURSED LA_RECURSED 516 #define MA_NOTRECURSED LA_NOTRECURSED 517 #endif 518 519 /* 520 * Common lock type names. 521 */ 522 #define MTX_NETWORK_LOCK "network driver" 523 524 #endif /* _KERNEL */ 525 #endif /* _SYS_MUTEX_H_ */
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