| kern_mutex.c (154482) | kern_mutex.c (154484) |
|---|---|
| 1/*- 2 * Copyright (c) 1998 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. --- 20 unchanged lines hidden (view full) --- 29 * and BSDI $Id: synch_machdep.c,v 2.3.2.39 2000/04/27 03:10:25 cp Exp $ 30 */ 31 32/* 33 * Machine independent bits of mutex implementation. 34 */ 35 36#include <sys/cdefs.h> | 1/*- 2 * Copyright (c) 1998 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. --- 20 unchanged lines hidden (view full) --- 29 * and BSDI $Id: synch_machdep.c,v 2.3.2.39 2000/04/27 03:10:25 cp Exp $ 30 */ 31 32/* 33 * Machine independent bits of mutex implementation. 34 */ 35 36#include <sys/cdefs.h> |
| 37__FBSDID("$FreeBSD: head/sys/kern/kern_mutex.c 154482 2006-01-17 16:47:42Z jhb $"); | 37__FBSDID("$FreeBSD: head/sys/kern/kern_mutex.c 154484 2006-01-17 16:55:17Z jhb $"); |
| 38 39#include "opt_adaptive_mutexes.h" 40#include "opt_ddb.h" 41#include "opt_mprof.h" 42#include "opt_mutex_wake_all.h" 43#include "opt_sched.h" 44 45#include <sys/param.h> --- 227 unchanged lines hidden (view full) --- 273 * Function versions of the inlined __mtx_* macros. These are used by 274 * modules and can also be called from assembly language if needed. 275 */ 276void 277_mtx_lock_flags(struct mtx *m, int opts, const char *file, int line) 278{ 279 280 MPASS(curthread != NULL); | 38 39#include "opt_adaptive_mutexes.h" 40#include "opt_ddb.h" 41#include "opt_mprof.h" 42#include "opt_mutex_wake_all.h" 43#include "opt_sched.h" 44 45#include <sys/param.h> --- 227 unchanged lines hidden (view full) --- 273 * Function versions of the inlined __mtx_* macros. These are used by 274 * modules and can also be called from assembly language if needed. 275 */ 276void 277_mtx_lock_flags(struct mtx *m, int opts, const char *file, int line) 278{ 279 280 MPASS(curthread != NULL); |
| 281 KASSERT(LO_CLASSINDEX(&m->mtx_object) == LOCK_CLASS_SLEEP_MUTEX, | 281 KASSERT(LOCK_CLASS(&m->mtx_object) == &lock_class_mtx_sleep, |
| 282 ("mtx_lock() of spin mutex %s @ %s:%d", m->mtx_object.lo_name, 283 file, line)); 284 WITNESS_CHECKORDER(&m->mtx_object, opts | LOP_NEWORDER | LOP_EXCLUSIVE, 285 file, line); 286 _get_sleep_lock(m, curthread, opts, file, line); 287 LOCK_LOG_LOCK("LOCK", &m->mtx_object, opts, m->mtx_recurse, file, 288 line); 289 WITNESS_LOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line); --- 8 unchanged lines hidden (view full) --- 298#endif 299} 300 301void 302_mtx_unlock_flags(struct mtx *m, int opts, const char *file, int line) 303{ 304 305 MPASS(curthread != NULL); | 282 ("mtx_lock() of spin mutex %s @ %s:%d", m->mtx_object.lo_name, 283 file, line)); 284 WITNESS_CHECKORDER(&m->mtx_object, opts | LOP_NEWORDER | LOP_EXCLUSIVE, 285 file, line); 286 _get_sleep_lock(m, curthread, opts, file, line); 287 LOCK_LOG_LOCK("LOCK", &m->mtx_object, opts, m->mtx_recurse, file, 288 line); 289 WITNESS_LOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line); --- 8 unchanged lines hidden (view full) --- 298#endif 299} 300 301void 302_mtx_unlock_flags(struct mtx *m, int opts, const char *file, int line) 303{ 304 305 MPASS(curthread != NULL); |
| 306 KASSERT(LO_CLASSINDEX(&m->mtx_object) == LOCK_CLASS_SLEEP_MUTEX, | 306 KASSERT(LOCK_CLASS(&m->mtx_object) == &lock_class_mtx_sleep, |
| 307 ("mtx_unlock() of spin mutex %s @ %s:%d", m->mtx_object.lo_name, 308 file, line)); 309 WITNESS_UNLOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line); 310 LOCK_LOG_LOCK("UNLOCK", &m->mtx_object, opts, m->mtx_recurse, file, 311 line); 312 mtx_assert(m, MA_OWNED); 313#ifdef MUTEX_PROFILING 314 if (m->mtx_acqtime != 0) { --- 62 unchanged lines hidden (view full) --- 377 _rel_sleep_lock(m, curthread, opts, file, line); 378} 379 380void 381_mtx_lock_spin_flags(struct mtx *m, int opts, const char *file, int line) 382{ 383 384 MPASS(curthread != NULL); | 307 ("mtx_unlock() of spin mutex %s @ %s:%d", m->mtx_object.lo_name, 308 file, line)); 309 WITNESS_UNLOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line); 310 LOCK_LOG_LOCK("UNLOCK", &m->mtx_object, opts, m->mtx_recurse, file, 311 line); 312 mtx_assert(m, MA_OWNED); 313#ifdef MUTEX_PROFILING 314 if (m->mtx_acqtime != 0) { --- 62 unchanged lines hidden (view full) --- 377 _rel_sleep_lock(m, curthread, opts, file, line); 378} 379 380void 381_mtx_lock_spin_flags(struct mtx *m, int opts, const char *file, int line) 382{ 383 384 MPASS(curthread != NULL); |
| 385 KASSERT(LO_CLASSINDEX(&m->mtx_object) == LOCK_CLASS_SPIN_MUTEX, | 385 KASSERT(LOCK_CLASS(&m->mtx_object) == &lock_class_mtx_spin, |
| 386 ("mtx_lock_spin() of sleep mutex %s @ %s:%d", 387 m->mtx_object.lo_name, file, line)); 388 WITNESS_CHECKORDER(&m->mtx_object, opts | LOP_NEWORDER | LOP_EXCLUSIVE, 389 file, line); 390 _get_spin_lock(m, curthread, opts, file, line); 391 LOCK_LOG_LOCK("LOCK", &m->mtx_object, opts, m->mtx_recurse, file, 392 line); 393 WITNESS_LOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line); 394} 395 396void 397_mtx_unlock_spin_flags(struct mtx *m, int opts, const char *file, int line) 398{ 399 400 MPASS(curthread != NULL); | 386 ("mtx_lock_spin() of sleep mutex %s @ %s:%d", 387 m->mtx_object.lo_name, file, line)); 388 WITNESS_CHECKORDER(&m->mtx_object, opts | LOP_NEWORDER | LOP_EXCLUSIVE, 389 file, line); 390 _get_spin_lock(m, curthread, opts, file, line); 391 LOCK_LOG_LOCK("LOCK", &m->mtx_object, opts, m->mtx_recurse, file, 392 line); 393 WITNESS_LOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line); 394} 395 396void 397_mtx_unlock_spin_flags(struct mtx *m, int opts, const char *file, int line) 398{ 399 400 MPASS(curthread != NULL); |
| 401 KASSERT(LO_CLASSINDEX(&m->mtx_object) == LOCK_CLASS_SPIN_MUTEX, | 401 KASSERT(LOCK_CLASS(&m->mtx_object) == &lock_class_mtx_spin, |
| 402 ("mtx_unlock_spin() of sleep mutex %s @ %s:%d", 403 m->mtx_object.lo_name, file, line)); 404 WITNESS_UNLOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line); 405 LOCK_LOG_LOCK("UNLOCK", &m->mtx_object, opts, m->mtx_recurse, file, 406 line); 407 mtx_assert(m, MA_OWNED); 408 _rel_spin_lock(m); 409} --- 4 unchanged lines hidden (view full) --- 414 * is already owned, it will recursively acquire the lock. 415 */ 416int 417_mtx_trylock(struct mtx *m, int opts, const char *file, int line) 418{ 419 int rval; 420 421 MPASS(curthread != NULL); | 402 ("mtx_unlock_spin() of sleep mutex %s @ %s:%d", 403 m->mtx_object.lo_name, file, line)); 404 WITNESS_UNLOCK(&m->mtx_object, opts | LOP_EXCLUSIVE, file, line); 405 LOCK_LOG_LOCK("UNLOCK", &m->mtx_object, opts, m->mtx_recurse, file, 406 line); 407 mtx_assert(m, MA_OWNED); 408 _rel_spin_lock(m); 409} --- 4 unchanged lines hidden (view full) --- 414 * is already owned, it will recursively acquire the lock. 415 */ 416int 417_mtx_trylock(struct mtx *m, int opts, const char *file, int line) 418{ 419 int rval; 420 421 MPASS(curthread != NULL); |
| 422 KASSERT(LO_CLASSINDEX(&m->mtx_object) == LOCK_CLASS_SLEEP_MUTEX, | 422 KASSERT(LOCK_CLASS(&m->mtx_object) == &lock_class_mtx_sleep, |
| 423 ("mtx_trylock() of spin mutex %s @ %s:%d", m->mtx_object.lo_name, 424 file, line)); 425 426 if (mtx_owned(m) && (m->mtx_object.lo_flags & LO_RECURSABLE) != 0) { 427 m->mtx_recurse++; 428 atomic_set_ptr(&m->mtx_lock, MTX_RECURSED); 429 rval = 1; 430 } else --- 394 unchanged lines hidden (view full) --- 825 * Mutex initialization routine; initialize lock `m' of type contained in 826 * `opts' with options contained in `opts' and name `name.' The optional 827 * lock type `type' is used as a general lock category name for use with 828 * witness. 829 */ 830void 831mtx_init(struct mtx *m, const char *name, const char *type, int opts) 832{ | 423 ("mtx_trylock() of spin mutex %s @ %s:%d", m->mtx_object.lo_name, 424 file, line)); 425 426 if (mtx_owned(m) && (m->mtx_object.lo_flags & LO_RECURSABLE) != 0) { 427 m->mtx_recurse++; 428 atomic_set_ptr(&m->mtx_lock, MTX_RECURSED); 429 rval = 1; 430 } else --- 394 unchanged lines hidden (view full) --- 825 * Mutex initialization routine; initialize lock `m' of type contained in 826 * `opts' with options contained in `opts' and name `name.' The optional 827 * lock type `type' is used as a general lock category name for use with 828 * witness. 829 */ 830void 831mtx_init(struct mtx *m, const char *name, const char *type, int opts) 832{ |
| 833 struct lock_object *lock; | 833 struct lock_class *class; 834 int flags; |
| 834 835 MPASS((opts & ~(MTX_SPIN | MTX_QUIET | MTX_RECURSE | 836 MTX_NOWITNESS | MTX_DUPOK)) == 0); 837 838#ifdef MUTEX_DEBUG 839 /* Diagnostic and error correction */ 840 mtx_validate(m); 841#endif 842 | 835 836 MPASS((opts & ~(MTX_SPIN | MTX_QUIET | MTX_RECURSE | 837 MTX_NOWITNESS | MTX_DUPOK)) == 0); 838 839#ifdef MUTEX_DEBUG 840 /* Diagnostic and error correction */ 841 mtx_validate(m); 842#endif 843 |
| 843 lock = &m->mtx_object; 844 KASSERT((lock->lo_flags & LO_INITIALIZED) == 0, 845 ("mutex \"%s\" %p already initialized", name, m)); 846 bzero(m, sizeof(*m)); | 844 /* Determine lock class and lock flags. */ |
| 847 if (opts & MTX_SPIN) | 845 if (opts & MTX_SPIN) |
| 848 lock->lo_flags = LOCK_CLASS_SPIN_MUTEX << LO_CLASSSHIFT; | 846 class = &lock_class_mtx_spin; |
| 849 else | 847 else |
| 850 lock->lo_flags = LOCK_CLASS_SLEEP_MUTEX << LO_CLASSSHIFT; 851 lock->lo_name = name; 852 lock->lo_type = type != NULL ? type : name; | 848 class = &lock_class_mtx_sleep; 849 flags = 0; |
| 853 if (opts & MTX_QUIET) | 850 if (opts & MTX_QUIET) |
| 854 lock->lo_flags |= LO_QUIET; | 851 flags |= LO_QUIET; |
| 855 if (opts & MTX_RECURSE) | 852 if (opts & MTX_RECURSE) |
| 856 lock->lo_flags |= LO_RECURSABLE; | 853 flags |= LO_RECURSABLE; |
| 857 if ((opts & MTX_NOWITNESS) == 0) | 854 if ((opts & MTX_NOWITNESS) == 0) |
| 858 lock->lo_flags |= LO_WITNESS; | 855 flags |= LO_WITNESS; |
| 859 if (opts & MTX_DUPOK) | 856 if (opts & MTX_DUPOK) |
| 860 lock->lo_flags |= LO_DUPOK; | 857 flags |= LO_DUPOK; |
| 861 | 858 |
| 859 /* Initialize mutex. */ |
|
| 862 m->mtx_lock = MTX_UNOWNED; | 860 m->mtx_lock = MTX_UNOWNED; |
| 861 m->mtx_recurse = 0; 862#ifdef MUTEX_PROFILING 863 m->mtx_acqtime = 0; 864 m->mtx_filename = NULL; 865 m->mtx_lineno = 0; 866 m->mtx_contest_holding = 0; 867 m->mtx_contest_locking = 0; 868#endif |
|
| 863 | 869 |
| 864 LOCK_LOG_INIT(lock, opts); 865 866 WITNESS_INIT(lock); | 870 lock_init(&m->mtx_object, class, name, type, flags); |
| 867} 868 869/* 870 * Remove lock `m' from all_mtx queue. We don't allow MTX_QUIET to be 871 * passed in as a flag here because if the corresponding mtx_init() was 872 * called with MTX_QUIET set, then it will already be set in the mutex's 873 * flags. 874 */ 875void 876mtx_destroy(struct mtx *m) 877{ 878 | 871} 872 873/* 874 * Remove lock `m' from all_mtx queue. We don't allow MTX_QUIET to be 875 * passed in as a flag here because if the corresponding mtx_init() was 876 * called with MTX_QUIET set, then it will already be set in the mutex's 877 * flags. 878 */ 879void 880mtx_destroy(struct mtx *m) 881{ 882 |
| 879 LOCK_LOG_DESTROY(&m->mtx_object, 0); 880 | |
| 881 if (!mtx_owned(m)) 882 MPASS(mtx_unowned(m)); 883 else { 884 MPASS((m->mtx_lock & (MTX_RECURSED|MTX_CONTESTED)) == 0); 885 886 /* Perform the non-mtx related part of mtx_unlock_spin(). */ | 883 if (!mtx_owned(m)) 884 MPASS(mtx_unowned(m)); 885 else { 886 MPASS((m->mtx_lock & (MTX_RECURSED|MTX_CONTESTED)) == 0); 887 888 /* Perform the non-mtx related part of mtx_unlock_spin(). */ |
| 887 if (LO_CLASSINDEX(&m->mtx_object) == LOCK_CLASS_SPIN_MUTEX) | 889 if (LOCK_CLASS(&m->mtx_object) == &lock_class_mtx_spin) |
| 888 spinlock_exit(); 889 890 /* Tell witness this isn't locked to make it happy. */ 891 WITNESS_UNLOCK(&m->mtx_object, LOP_EXCLUSIVE, __FILE__, 892 __LINE__); 893 } 894 | 890 spinlock_exit(); 891 892 /* Tell witness this isn't locked to make it happy. */ 893 WITNESS_UNLOCK(&m->mtx_object, LOP_EXCLUSIVE, __FILE__, 894 __LINE__); 895 } 896 |
| 895 WITNESS_DESTROY(&m->mtx_object); | 897 lock_destroy(&m->mtx_object); |
| 896} 897 898/* 899 * Intialize the mutex code and system mutexes. This is called from the MD 900 * startup code prior to mi_startup(). The per-CPU data space needs to be 901 * setup before this is called. 902 */ 903void --- 8 unchanged lines hidden (view full) --- 912 */ 913 mtx_init(&Giant, "Giant", NULL, MTX_DEF | MTX_RECURSE); 914 mtx_init(&sched_lock, "sched lock", NULL, MTX_SPIN | MTX_RECURSE); 915 mtx_init(&proc0.p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK); 916 mtx_init(&devmtx, "cdev", NULL, MTX_DEF); 917 mtx_lock(&Giant); 918} 919 | 898} 899 900/* 901 * Intialize the mutex code and system mutexes. This is called from the MD 902 * startup code prior to mi_startup(). The per-CPU data space needs to be 903 * setup before this is called. 904 */ 905void --- 8 unchanged lines hidden (view full) --- 914 */ 915 mtx_init(&Giant, "Giant", NULL, MTX_DEF | MTX_RECURSE); 916 mtx_init(&sched_lock, "sched lock", NULL, MTX_SPIN | MTX_RECURSE); 917 mtx_init(&proc0.p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK); 918 mtx_init(&devmtx, "cdev", NULL, MTX_DEF); 919 mtx_lock(&Giant); 920} 921 |
| 920#if LOCK_DEBUG > 0 || defined(DDB) 921/* XXX: This is not mutex-specific. */ 922struct lock_class *lock_classes[LOCK_CLASS_MAX + 1] = { 923 &lock_class_mtx_spin, 924 &lock_class_mtx_sleep, 925 &lock_class_sx, 926}; 927#endif 928 | |
| 929#ifdef DDB | 922#ifdef DDB |
| 930/* XXX: This function is not mutex-specific. */ 931DB_SHOW_COMMAND(lock, db_show_lock) 932{ 933 struct lock_object *lock; 934 struct lock_class *class; 935 936 if (!have_addr) 937 return; 938 lock = (struct lock_object *)addr; 939 if (LO_CLASSINDEX(lock) > LOCK_CLASS_MAX) { 940 db_printf("Unknown lock class: %d\n", LO_CLASSINDEX(lock)); 941 return; 942 } 943 class = LOCK_CLASS(lock); 944 db_printf(" class: %s\n", class->lc_name); 945 db_printf(" name: %s\n", lock->lo_name); 946 if (lock->lo_type && lock->lo_type != lock->lo_name) 947 db_printf(" type: %s\n", lock->lo_type); 948 class->lc_ddb_show(lock); 949} 950 | |
| 951void 952db_show_mtx(struct lock_object *lock) 953{ 954 struct thread *td; 955 struct mtx *m; 956 957 m = (struct mtx *)lock; 958 959 db_printf(" flags: {"); | 923void 924db_show_mtx(struct lock_object *lock) 925{ 926 struct thread *td; 927 struct mtx *m; 928 929 m = (struct mtx *)lock; 930 931 db_printf(" flags: {"); |
| 960 if (LO_CLASSINDEX(lock) == LOCK_CLASS_SPIN_MUTEX) | 932 if (LOCK_CLASS(lock) == &lock_class_mtx_spin) |
| 961 db_printf("SPIN"); 962 else 963 db_printf("DEF"); 964 if (m->mtx_object.lo_flags & LO_RECURSABLE) 965 db_printf(", RECURSE"); 966 if (m->mtx_object.lo_flags & LO_DUPOK) 967 db_printf(", DUPOK"); 968 db_printf("}\n"); --- 20 unchanged lines hidden --- | 933 db_printf("SPIN"); 934 else 935 db_printf("DEF"); 936 if (m->mtx_object.lo_flags & LO_RECURSABLE) 937 db_printf(", RECURSE"); 938 if (m->mtx_object.lo_flags & LO_DUPOK) 939 db_printf(", DUPOK"); 940 db_printf("}\n"); --- 20 unchanged lines hidden --- |