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/11.0/sys/sys/mutex.h 303549 2016-07-30 09:28:13Z kib $ 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 void __mtx_lock_sleep(volatile uintptr_t *c, uintptr_t tid, int opts, 102 const char *file, int line); 103 void __mtx_unlock_sleep(volatile uintptr_t *c, int opts, const char *file, 104 int line); 105 #ifdef SMP 106 void _mtx_lock_spin_cookie(volatile uintptr_t *c, uintptr_t tid, int opts, 107 const char *file, int line); 108 #endif 109 void __mtx_lock_flags(volatile uintptr_t *c, int opts, const char *file, 110 int line); 111 void __mtx_unlock_flags(volatile uintptr_t *c, int opts, const char *file, 112 int line); 113 void __mtx_lock_spin_flags(volatile uintptr_t *c, int opts, const char *file, 114 int line); 115 int __mtx_trylock_spin_flags(volatile uintptr_t *c, int opts, 116 const char *file, int line); 117 void __mtx_unlock_spin_flags(volatile uintptr_t *c, int opts, 118 const char *file, int line); 119 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 120 void __mtx_assert(const volatile uintptr_t *c, int what, const char *file, 121 int line); 122 #endif 123 void thread_lock_flags_(struct thread *, int, const char *, int); 124 125 #define thread_lock(tdp) \ 126 thread_lock_flags_((tdp), 0, __FILE__, __LINE__) 127 #define thread_lock_flags(tdp, opt) \ 128 thread_lock_flags_((tdp), (opt), __FILE__, __LINE__) 129 #define thread_unlock(tdp) \ 130 mtx_unlock_spin((tdp)->td_lock) 131 132 /* 133 * Top-level macros to provide lock cookie once the actual mtx is passed. 134 * They will also prevent passing a malformed object to the mtx KPI by 135 * failing compilation as the mtx_lock reserved member will not be found. 136 */ 137 #define mtx_init(m, n, t, o) \ 138 _mtx_init(&(m)->mtx_lock, n, t, o) 139 #define mtx_destroy(m) \ 140 _mtx_destroy(&(m)->mtx_lock) 141 #define mtx_trylock_flags_(m, o, f, l) \ 142 _mtx_trylock_flags_(&(m)->mtx_lock, o, f, l) 143 #define _mtx_lock_sleep(m, t, o, f, l) \ 144 __mtx_lock_sleep(&(m)->mtx_lock, t, o, f, l) 145 #define _mtx_unlock_sleep(m, o, f, l) \ 146 __mtx_unlock_sleep(&(m)->mtx_lock, o, f, l) 147 #ifdef SMP 148 #define _mtx_lock_spin(m, t, o, f, l) \ 149 _mtx_lock_spin_cookie(&(m)->mtx_lock, t, o, f, l) 150 #endif 151 #define _mtx_lock_flags(m, o, f, l) \ 152 __mtx_lock_flags(&(m)->mtx_lock, o, f, l) 153 #define _mtx_unlock_flags(m, o, f, l) \ 154 __mtx_unlock_flags(&(m)->mtx_lock, o, f, l) 155 #define _mtx_lock_spin_flags(m, o, f, l) \ 156 __mtx_lock_spin_flags(&(m)->mtx_lock, o, f, l) 157 #define _mtx_trylock_spin_flags(m, o, f, l) \ 158 __mtx_trylock_spin_flags(&(m)->mtx_lock, o, f, l) 159 #define _mtx_unlock_spin_flags(m, o, f, l) \ 160 __mtx_unlock_spin_flags(&(m)->mtx_lock, o, f, l) 161 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 162 #define _mtx_assert(m, w, f, l) \ 163 __mtx_assert(&(m)->mtx_lock, w, f, l) 164 #endif 165 166 #define mtx_recurse lock_object.lo_data 167 168 /* Very simple operations on mtx_lock. */ 169 170 /* Try to obtain mtx_lock once. */ 171 #define _mtx_obtain_lock(mp, tid) \ 172 atomic_cmpset_acq_ptr(&(mp)->mtx_lock, MTX_UNOWNED, (tid)) 173 174 /* Try to release mtx_lock if it is unrecursed and uncontested. */ 175 #define _mtx_release_lock(mp, tid) \ 176 atomic_cmpset_rel_ptr(&(mp)->mtx_lock, (tid), MTX_UNOWNED) 177 178 /* Release mtx_lock quickly, assuming we own it. */ 179 #define _mtx_release_lock_quick(mp) \ 180 atomic_store_rel_ptr(&(mp)->mtx_lock, MTX_UNOWNED) 181 182 /* 183 * Full lock operations that are suitable to be inlined in non-debug 184 * kernels. If the lock cannot be acquired or released trivially then 185 * the work is deferred to another function. 186 */ 187 188 /* Lock a normal mutex. */ 189 #define __mtx_lock(mp, tid, opts, file, line) do { \ 190 uintptr_t _tid = (uintptr_t)(tid); \ 191 \ 192 if (((mp)->mtx_lock != MTX_UNOWNED || !_mtx_obtain_lock((mp), _tid)))\ 193 _mtx_lock_sleep((mp), _tid, (opts), (file), (line)); \ 194 else \ 195 LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(adaptive__acquire, \ 196 mp, 0, 0, file, line); \ 197 } while (0) 198 199 /* 200 * Lock a spin mutex. For spinlocks, we handle recursion inline (it 201 * turns out that function calls can be significantly expensive on 202 * some architectures). Since spin locks are not _too_ common, 203 * inlining this code is not too big a deal. 204 */ 205 #ifdef SMP 206 #define __mtx_lock_spin(mp, tid, opts, file, line) do { \ 207 uintptr_t _tid = (uintptr_t)(tid); \ 208 \ 209 spinlock_enter(); \ 210 if (((mp)->mtx_lock != MTX_UNOWNED || !_mtx_obtain_lock((mp), _tid))) {\ 211 if ((mp)->mtx_lock == _tid) \ 212 (mp)->mtx_recurse++; \ 213 else \ 214 _mtx_lock_spin((mp), _tid, (opts), (file), (line)); \ 215 } else \ 216 LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(spin__acquire, \ 217 mp, 0, 0, file, line); \ 218 } while (0) 219 #define __mtx_trylock_spin(mp, tid, opts, file, line) __extension__ ({ \ 220 uintptr_t _tid = (uintptr_t)(tid); \ 221 int _ret; \ 222 \ 223 spinlock_enter(); \ 224 if (((mp)->mtx_lock != MTX_UNOWNED || !_mtx_obtain_lock((mp), _tid))) {\ 225 spinlock_exit(); \ 226 _ret = 0; \ 227 } else { \ 228 LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(spin__acquire, \ 229 mp, 0, 0, file, line); \ 230 _ret = 1; \ 231 } \ 232 _ret; \ 233 }) 234 #else /* SMP */ 235 #define __mtx_lock_spin(mp, tid, opts, file, line) do { \ 236 uintptr_t _tid = (uintptr_t)(tid); \ 237 \ 238 spinlock_enter(); \ 239 if ((mp)->mtx_lock == _tid) \ 240 (mp)->mtx_recurse++; \ 241 else { \ 242 KASSERT((mp)->mtx_lock == MTX_UNOWNED, ("corrupt spinlock")); \ 243 (mp)->mtx_lock = _tid; \ 244 } \ 245 } while (0) 246 #define __mtx_trylock_spin(mp, tid, opts, file, line) __extension__ ({ \ 247 uintptr_t _tid = (uintptr_t)(tid); \ 248 int _ret; \ 249 \ 250 spinlock_enter(); \ 251 if ((mp)->mtx_lock != MTX_UNOWNED) { \ 252 spinlock_exit(); \ 253 _ret = 0; \ 254 } else { \ 255 (mp)->mtx_lock = _tid; \ 256 _ret = 1; \ 257 } \ 258 _ret; \ 259 }) 260 #endif /* SMP */ 261 262 /* Unlock a normal mutex. */ 263 #define __mtx_unlock(mp, tid, opts, file, line) do { \ 264 uintptr_t _tid = (uintptr_t)(tid); \ 265 \ 266 if ((mp)->mtx_recurse == 0) \ 267 LOCKSTAT_PROFILE_RELEASE_LOCK(adaptive__release, mp); \ 268 if ((mp)->mtx_lock != _tid || !_mtx_release_lock((mp), _tid)) \ 269 _mtx_unlock_sleep((mp), (opts), (file), (line)); \ 270 } while (0) 271 272 /* 273 * Unlock a spin mutex. For spinlocks, we can handle everything 274 * inline, as it's pretty simple and a function call would be too 275 * expensive (at least on some architectures). Since spin locks are 276 * not _too_ common, inlining this code is not too big a deal. 277 * 278 * Since we always perform a spinlock_enter() when attempting to acquire a 279 * spin lock, we need to always perform a matching spinlock_exit() when 280 * releasing a spin lock. This includes the recursion cases. 281 */ 282 #ifdef SMP 283 #define __mtx_unlock_spin(mp) do { \ 284 if (mtx_recursed((mp))) \ 285 (mp)->mtx_recurse--; \ 286 else { \ 287 LOCKSTAT_PROFILE_RELEASE_LOCK(spin__release, mp); \ 288 _mtx_release_lock_quick((mp)); \ 289 } \ 290 spinlock_exit(); \ 291 } while (0) 292 #else /* SMP */ 293 #define __mtx_unlock_spin(mp) do { \ 294 if (mtx_recursed((mp))) \ 295 (mp)->mtx_recurse--; \ 296 else { \ 297 LOCKSTAT_PROFILE_RELEASE_LOCK(spin__release, mp); \ 298 (mp)->mtx_lock = MTX_UNOWNED; \ 299 } \ 300 spinlock_exit(); \ 301 } while (0) 302 #endif /* SMP */ 303 304 /* 305 * Exported lock manipulation interface. 306 * 307 * mtx_lock(m) locks MTX_DEF mutex `m' 308 * 309 * mtx_lock_spin(m) locks MTX_SPIN mutex `m' 310 * 311 * mtx_unlock(m) unlocks MTX_DEF mutex `m' 312 * 313 * mtx_unlock_spin(m) unlocks MTX_SPIN mutex `m' 314 * 315 * mtx_lock_spin_flags(m, opts) and mtx_lock_flags(m, opts) locks mutex `m' 316 * and passes option flags `opts' to the "hard" function, if required. 317 * With these routines, it is possible to pass flags such as MTX_QUIET 318 * to the appropriate lock manipulation routines. 319 * 320 * mtx_trylock(m) attempts to acquire MTX_DEF mutex `m' but doesn't sleep if 321 * it cannot. Rather, it returns 0 on failure and non-zero on success. 322 * It does NOT handle recursion as we assume that if a caller is properly 323 * using this part of the interface, he will know that the lock in question 324 * is _not_ recursed. 325 * 326 * mtx_trylock_flags(m, opts) is used the same way as mtx_trylock() but accepts 327 * relevant option flags `opts.' 328 * 329 * mtx_trylock_spin(m) attempts to acquire MTX_SPIN mutex `m' but doesn't 330 * spin if it cannot. Rather, it returns 0 on failure and non-zero on 331 * success. It always returns failure for recursed lock attempts. 332 * 333 * mtx_initialized(m) returns non-zero if the lock `m' has been initialized. 334 * 335 * mtx_owned(m) returns non-zero if the current thread owns the lock `m' 336 * 337 * mtx_recursed(m) returns non-zero if the lock `m' is presently recursed. 338 */ 339 #define mtx_lock(m) mtx_lock_flags((m), 0) 340 #define mtx_lock_spin(m) mtx_lock_spin_flags((m), 0) 341 #define mtx_trylock(m) mtx_trylock_flags((m), 0) 342 #define mtx_trylock_spin(m) mtx_trylock_spin_flags((m), 0) 343 #define mtx_unlock(m) mtx_unlock_flags((m), 0) 344 #define mtx_unlock_spin(m) mtx_unlock_spin_flags((m), 0) 345 346 struct mtx_pool; 347 348 struct mtx_pool *mtx_pool_create(const char *mtx_name, int pool_size, int opts); 349 void mtx_pool_destroy(struct mtx_pool **poolp); 350 struct mtx *mtx_pool_find(struct mtx_pool *pool, void *ptr); 351 struct mtx *mtx_pool_alloc(struct mtx_pool *pool); 352 #define mtx_pool_lock(pool, ptr) \ 353 mtx_lock(mtx_pool_find((pool), (ptr))) 354 #define mtx_pool_lock_spin(pool, ptr) \ 355 mtx_lock_spin(mtx_pool_find((pool), (ptr))) 356 #define mtx_pool_unlock(pool, ptr) \ 357 mtx_unlock(mtx_pool_find((pool), (ptr))) 358 #define mtx_pool_unlock_spin(pool, ptr) \ 359 mtx_unlock_spin(mtx_pool_find((pool), (ptr))) 360 361 /* 362 * mtxpool_sleep is a general purpose pool of sleep mutexes. 363 */ 364 extern struct mtx_pool *mtxpool_sleep; 365 366 #ifndef LOCK_DEBUG 367 #error LOCK_DEBUG not defined, include <sys/lock.h> before <sys/mutex.h> 368 #endif 369 #if LOCK_DEBUG > 0 || defined(MUTEX_NOINLINE) 370 #define mtx_lock_flags_(m, opts, file, line) \ 371 _mtx_lock_flags((m), (opts), (file), (line)) 372 #define mtx_unlock_flags_(m, opts, file, line) \ 373 _mtx_unlock_flags((m), (opts), (file), (line)) 374 #define mtx_lock_spin_flags_(m, opts, file, line) \ 375 _mtx_lock_spin_flags((m), (opts), (file), (line)) 376 #define mtx_trylock_spin_flags_(m, opts, file, line) \ 377 _mtx_trylock_spin_flags((m), (opts), (file), (line)) 378 #define mtx_unlock_spin_flags_(m, opts, file, line) \ 379 _mtx_unlock_spin_flags((m), (opts), (file), (line)) 380 #else /* LOCK_DEBUG == 0 && !MUTEX_NOINLINE */ 381 #define mtx_lock_flags_(m, opts, file, line) \ 382 __mtx_lock((m), curthread, (opts), (file), (line)) 383 #define mtx_unlock_flags_(m, opts, file, line) \ 384 __mtx_unlock((m), curthread, (opts), (file), (line)) 385 #define mtx_lock_spin_flags_(m, opts, file, line) \ 386 __mtx_lock_spin((m), curthread, (opts), (file), (line)) 387 #define mtx_trylock_spin_flags_(m, opts, file, line) \ 388 __mtx_trylock_spin((m), curthread, (opts), (file), (line)) 389 #define mtx_unlock_spin_flags_(m, opts, file, line) \ 390 __mtx_unlock_spin((m)) 391 #endif /* LOCK_DEBUG > 0 || MUTEX_NOINLINE */ 392 393 #ifdef INVARIANTS 394 #define mtx_assert_(m, what, file, line) \ 395 _mtx_assert((m), (what), (file), (line)) 396 397 #define GIANT_REQUIRED mtx_assert_(&Giant, MA_OWNED, __FILE__, __LINE__) 398 399 #else /* INVARIANTS */ 400 #define mtx_assert_(m, what, file, line) (void)0 401 #define GIANT_REQUIRED 402 #endif /* INVARIANTS */ 403 404 #define mtx_lock_flags(m, opts) \ 405 mtx_lock_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 406 #define mtx_unlock_flags(m, opts) \ 407 mtx_unlock_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 408 #define mtx_lock_spin_flags(m, opts) \ 409 mtx_lock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 410 #define mtx_unlock_spin_flags(m, opts) \ 411 mtx_unlock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 412 #define mtx_trylock_flags(m, opts) \ 413 mtx_trylock_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 414 #define mtx_trylock_spin_flags(m, opts) \ 415 mtx_trylock_spin_flags_((m), (opts), LOCK_FILE, LOCK_LINE) 416 #define mtx_assert(m, what) \ 417 mtx_assert_((m), (what), __FILE__, __LINE__) 418 419 #define mtx_sleep(chan, mtx, pri, wmesg, timo) \ 420 _sleep((chan), &(mtx)->lock_object, (pri), (wmesg), \ 421 tick_sbt * (timo), 0, C_HARDCLOCK) 422 423 #define mtx_initialized(m) lock_initialized(&(m)->lock_object) 424 425 #define mtx_owned(m) (((m)->mtx_lock & ~MTX_FLAGMASK) == (uintptr_t)curthread) 426 427 #define mtx_recursed(m) ((m)->mtx_recurse != 0) 428 429 #define mtx_name(m) ((m)->lock_object.lo_name) 430 431 /* 432 * Global locks. 433 */ 434 extern struct mtx Giant; 435 extern struct mtx blocked_lock; 436 437 /* 438 * Giant lock manipulation and clean exit macros. 439 * Used to replace return with an exit Giant and return. 440 * 441 * Note that DROP_GIANT*() needs to be paired with PICKUP_GIANT() 442 * The #ifndef is to allow lint-like tools to redefine DROP_GIANT. 443 */ 444 #ifndef DROP_GIANT 445 #define DROP_GIANT() \ 446 do { \ 447 int _giantcnt = 0; \ 448 WITNESS_SAVE_DECL(Giant); \ 449 \ 450 if (mtx_owned(&Giant)) { \ 451 WITNESS_SAVE(&Giant.lock_object, Giant); \ 452 for (_giantcnt = 0; mtx_owned(&Giant) && \ 453 !SCHEDULER_STOPPED(); _giantcnt++) \ 454 mtx_unlock(&Giant); \ 455 } 456 457 #define PICKUP_GIANT() \ 458 PARTIAL_PICKUP_GIANT(); \ 459 } while (0) 460 461 #define PARTIAL_PICKUP_GIANT() \ 462 mtx_assert(&Giant, MA_NOTOWNED); \ 463 if (_giantcnt > 0) { \ 464 while (_giantcnt--) \ 465 mtx_lock(&Giant); \ 466 WITNESS_RESTORE(&Giant.lock_object, Giant); \ 467 } 468 #endif 469 470 struct mtx_args { 471 void *ma_mtx; 472 const char *ma_desc; 473 int ma_opts; 474 }; 475 476 #define MTX_SYSINIT(name, mtx, desc, opts) \ 477 static struct mtx_args name##_args = { \ 478 (mtx), \ 479 (desc), \ 480 (opts) \ 481 }; \ 482 SYSINIT(name##_mtx_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \ 483 mtx_sysinit, &name##_args); \ 484 SYSUNINIT(name##_mtx_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \ 485 _mtx_destroy, __DEVOLATILE(void *, &(mtx)->mtx_lock)) 486 487 /* 488 * The INVARIANTS-enabled mtx_assert() functionality. 489 * 490 * The constants need to be defined for INVARIANT_SUPPORT infrastructure 491 * support as _mtx_assert() itself uses them and the latter implies that 492 * _mtx_assert() must build. 493 */ 494 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 495 #define MA_OWNED LA_XLOCKED 496 #define MA_NOTOWNED LA_UNLOCKED 497 #define MA_RECURSED LA_RECURSED 498 #define MA_NOTRECURSED LA_NOTRECURSED 499 #endif 500 501 /* 502 * Common lock type names. 503 */ 504 #define MTX_NETWORK_LOCK "network driver" 505 506 #endif /* _KERNEL */ 507 #endif /* _SYS_MUTEX_H_ */
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