pthread_int.h revision 1.106
1 /* $NetBSD: pthread_int.h,v 1.106 2020/06/02 00:29:53 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008, 2020 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 _LIB_PTHREAD_INT_H 34 #define _LIB_PTHREAD_INT_H 35 36 #include <sys/tls.h> 37 38 /* #define PTHREAD__DEBUG */ 39 40 #include "pthread_types.h" 41 #include "pthread_queue.h" 42 #include "pthread_md.h" 43 44 /* Need to use libc-private names for atomic operations. */ 45 #include "../../common/lib/libc/atomic/atomic_op_namespace.h" 46 47 #include <sys/atomic.h> 48 #include <sys/rbtree.h> 49 #include <sys/param.h> 50 51 #include <limits.h> 52 #include <lwp.h> 53 #include <signal.h> 54 #include <stdbool.h> 55 56 #ifdef __GNUC__ 57 #define PTHREAD_HIDE __attribute__ ((visibility("hidden"))) 58 #else 59 #define PTHREAD_HIDE /* nothing */ 60 #endif 61 62 #define PTHREAD__UNPARK_MAX 128 63 64 /* 65 * The size of this structure needs to be no larger than struct 66 * __pthread_cleanup_store, defined in pthread.h. 67 */ 68 struct pt_clean_t { 69 PTQ_ENTRY(pt_clean_t) ptc_next; 70 void (*ptc_cleanup)(void *); 71 void *ptc_arg; 72 }; 73 74 /* Private data for pthread_attr_t */ 75 struct pthread_attr_private { 76 char ptap_name[PTHREAD_MAX_NAMELEN_NP]; 77 void *ptap_namearg; 78 void *ptap_stackaddr; 79 size_t ptap_stacksize; 80 size_t ptap_guardsize; 81 struct sched_param ptap_sp; 82 int ptap_policy; 83 }; 84 85 struct pthread_lock_ops { 86 void (*plo_init)(__cpu_simple_lock_t *); 87 int (*plo_try)(__cpu_simple_lock_t *); 88 void (*plo_unlock)(__cpu_simple_lock_t *); 89 void (*plo_lock)(__cpu_simple_lock_t *); 90 }; 91 92 struct __pthread_st { 93 pthread_t pt_self; /* Must be first. */ 94 #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II) 95 struct tls_tcb *pt_tls; /* Thread Local Storage area */ 96 #endif 97 unsigned int pt_magic; /* Magic number */ 98 int pt_state; /* running, blocked, etc. */ 99 int pt_flags; /* see PT_FLAG_* below */ 100 int pt_cancel; /* Deferred cancellation */ 101 int pt_errno; /* Thread-specific errno. */ 102 stack_t pt_stack; /* Our stack */ 103 bool pt_stack_allocated; 104 size_t pt_guardsize; 105 void *pt_exitval; /* Read by pthread_join() */ 106 char *pt_name; /* Thread's name, set by the app. */ 107 int pt_willpark; /* About to park */ 108 struct pthread_lock_ops pt_lockops;/* Cached to avoid PIC overhead */ 109 void *(*pt_func)(void *);/* Function to call at start. */ 110 void *pt_arg; /* Argument to pass at start. */ 111 112 /* Threads to defer waking, usually until pthread_mutex_unlock(). */ 113 lwpid_t pt_waiters[PTHREAD__UNPARK_MAX]; 114 size_t pt_nwaiters; 115 116 /* Stack of cancellation cleanup handlers and their arguments */ 117 PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; 118 119 /* LWP ID and entry on the list of all threads. */ 120 lwpid_t pt_lid; 121 PTQ_ENTRY(__pthread_st) pt_deadq; 122 123 /* 124 * rbtree node and entry on the list of all threads. pt_alltree in 125 * its own cacheline, so pthread__find() is not needlessly impacted 126 * by threads going about their normal business. pt_allq is 127 * adjusted at the same time as pt_alltree. 128 */ 129 rb_node_t pt_alltree __aligned(COHERENCY_UNIT); 130 PTQ_ENTRY(__pthread_st) pt_allq; 131 132 /* Lock on state also gets its own line. */ 133 pthread_mutex_t pt_lock __aligned(COHERENCY_UNIT); 134 135 /* 136 * General synchronization data. We try to align, as threads 137 * on other CPUs will access this data frequently. 138 */ 139 int pt_dummy1 __aligned(COHERENCY_UNIT); 140 struct lwpctl *pt_lwpctl; /* Kernel/user comms area */ 141 volatile int pt_rwlocked; /* Handed rwlock successfully */ 142 volatile int pt_signalled; /* Received pthread_cond_signal() */ 143 volatile int pt_mutexwait; /* Waiting to acquire mutex */ 144 volatile int pt_condwait; /* Waiting to acquire mutex */ 145 void * volatile pt_mutexnext; /* Next thread in chain */ 146 void * volatile pt_condnext; /* Next thread in chain */ 147 void * volatile pt_sleepobj; /* Object slept on */ 148 PTQ_ENTRY(__pthread_st) pt_sleep; 149 150 /* Thread-specific data. Large so it sits close to the end. */ 151 int pt_havespecific __aligned(COHERENCY_UNIT); 152 struct pt_specific { 153 void *pts_value; 154 PTQ_ENTRY(pt_specific) pts_next; 155 } pt_specific[]; 156 }; 157 158 /* Thread states */ 159 #define PT_STATE_RUNNING 1 160 #define PT_STATE_ZOMBIE 5 161 #define PT_STATE_DEAD 6 162 163 /* Flag values */ 164 165 #define PT_FLAG_DETACHED 0x0001 166 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ 167 #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ 168 #define PT_FLAG_CS_PENDING 0x0010 169 #define PT_FLAG_SCOPE_SYSTEM 0x0040 170 #define PT_FLAG_EXPLICIT_SCHED 0x0080 171 #define PT_FLAG_SUSPENDED 0x0100 /* In the suspended queue */ 172 173 #define PT_MAGIC 0x11110001 174 #define PT_DEAD 0xDEAD0001 175 176 #define PT_ATTR_MAGIC 0x22220002 177 #define PT_ATTR_DEAD 0xDEAD0002 178 179 extern size_t pthread__stacksize; 180 extern size_t pthread__guardsize; 181 extern size_t pthread__pagesize; 182 extern int pthread__nspins; 183 extern int pthread__concurrency; 184 extern int pthread__osrev; 185 extern size_t pthread__unpark_max; 186 extern int pthread_keys_max; 187 188 extern int __uselibcstub; 189 190 /* Flag to be used in a ucontext_t's uc_flags indicating that 191 * the saved register state is "user" state only, not full 192 * trap state. 193 */ 194 #define _UC_USER_BIT 30 195 #define _UC_USER (1LU << _UC_USER_BIT) 196 197 /* Utility functions */ 198 void pthread__unpark_all(pthread_queue_t *, pthread_t, pthread_mutex_t *) 199 PTHREAD_HIDE; 200 void pthread__unpark(pthread_queue_t *, pthread_t, pthread_mutex_t *) 201 PTHREAD_HIDE; 202 int pthread__park(pthread_t, pthread_mutex_t *, pthread_queue_t *, 203 const struct timespec *, int) PTHREAD_HIDE; 204 pthread_mutex_t *pthread__hashlock(volatile const void *) PTHREAD_HIDE; 205 void pthread__clear_waiters(pthread_t) PTHREAD_HIDE; 206 207 /* Internal locking primitives */ 208 void pthread__lockprim_init(void) PTHREAD_HIDE; 209 void pthread_lockinit(pthread_spin_t *) PTHREAD_HIDE; 210 211 static inline void pthread__spinlock(pthread_t, pthread_spin_t *) 212 __attribute__((__always_inline__)); 213 static inline void 214 pthread__spinlock(pthread_t self, pthread_spin_t *lock) 215 { 216 if (__predict_true((*self->pt_lockops.plo_try)(lock))) 217 return; 218 (*self->pt_lockops.plo_lock)(lock); 219 } 220 221 static inline int pthread__spintrylock(pthread_t, pthread_spin_t *) 222 __attribute__((__always_inline__)); 223 static inline int 224 pthread__spintrylock(pthread_t self, pthread_spin_t *lock) 225 { 226 return (*self->pt_lockops.plo_try)(lock); 227 } 228 229 static inline void pthread__spinunlock(pthread_t, pthread_spin_t *) 230 __attribute__((__always_inline__)); 231 static inline void 232 pthread__spinunlock(pthread_t self, pthread_spin_t *lock) 233 { 234 (*self->pt_lockops.plo_unlock)(lock); 235 } 236 237 extern const struct pthread_lock_ops *pthread__lock_ops; 238 239 int pthread__simple_locked_p(__cpu_simple_lock_t *) PTHREAD_HIDE; 240 #define pthread__simple_lock_init(alp) (*pthread__lock_ops->plo_init)(alp) 241 #define pthread__simple_lock_try(alp) (*pthread__lock_ops->plo_try)(alp) 242 #define pthread__simple_unlock(alp) (*pthread__lock_ops->plo_unlock)(alp) 243 244 void pthread__testcancel(pthread_t) PTHREAD_HIDE; 245 int pthread__find(pthread_t) PTHREAD_HIDE; 246 247 #ifndef PTHREAD_MD_INIT 248 #define PTHREAD_MD_INIT 249 #endif 250 251 #ifndef _INITCONTEXT_U_MD 252 #define _INITCONTEXT_U_MD(ucp) 253 #endif 254 255 #define _INITCONTEXT_U(ucp) do { \ 256 (ucp)->uc_flags = _UC_CPU | _UC_STACK; \ 257 _INITCONTEXT_U_MD(ucp) \ 258 } while (/*CONSTCOND*/0) 259 260 261 #if !defined(__HAVE_TLS_VARIANT_I) && !defined(__HAVE_TLS_VARIANT_II) 262 #error Either __HAVE_TLS_VARIANT_I or __HAVE_TLS_VARIANT_II must be defined 263 #endif 264 265 #ifdef _PTHREAD_GETTCB_EXT 266 struct tls_tcb *_PTHREAD_GETTCB_EXT(void); 267 #endif 268 269 static inline pthread_t __constfunc 270 pthread__self(void) 271 { 272 #if defined(_PTHREAD_GETTCB_EXT) 273 struct tls_tcb * const tcb = _PTHREAD_GETTCB_EXT(); 274 #elif defined(__HAVE___LWP_GETTCB_FAST) 275 struct tls_tcb * const tcb = __lwp_gettcb_fast(); 276 #else 277 struct tls_tcb * const tcb = __lwp_getprivate_fast(); 278 #endif 279 return (pthread_t)tcb->tcb_pthread; 280 } 281 282 #define pthread__abort() \ 283 pthread__assertfunc(__FILE__, __LINE__, __func__, "unreachable") 284 285 #define pthread__assert(e) do { \ 286 if (__predict_false(!(e))) \ 287 pthread__assertfunc(__FILE__, __LINE__, __func__, #e); \ 288 } while (/*CONSTCOND*/0) 289 290 #define pthread__error(err, msg, e) do { \ 291 if (__predict_false(!(e))) { \ 292 pthread__errorfunc(__FILE__, __LINE__, __func__, msg); \ 293 return (err); \ 294 } \ 295 } while (/*CONSTCOND*/0) 296 297 void *pthread_tsd_init(size_t *) PTHREAD_HIDE; 298 void pthread__destroy_tsd(pthread_t) PTHREAD_HIDE; 299 void pthread__copy_tsd(pthread_t) PTHREAD_HIDE; 300 301 __dead void pthread__assertfunc(const char *, int, const char *, const char *) 302 PTHREAD_HIDE; 303 void pthread__errorfunc(const char *, int, const char *, const char *, ...) 304 __printflike(4, 5) PTHREAD_HIDE; 305 char *pthread__getenv(const char *) PTHREAD_HIDE; 306 __dead void pthread__cancelled(void) PTHREAD_HIDE; 307 void pthread__mutex_deferwake(pthread_t, pthread_mutex_t *) PTHREAD_HIDE; 308 int pthread__checkpri(int) PTHREAD_HIDE; 309 int pthread__add_specific(pthread_t, pthread_key_t, const void *) PTHREAD_HIDE; 310 311 #ifndef pthread__smt_pause 312 #define pthread__smt_pause() /* nothing */ 313 #endif 314 #ifndef pthread__smt_wake 315 #define pthread__smt_wake() /* nothing */ 316 #endif 317 318 /* 319 * Bits in the owner field of the lock that indicate lock state. If the 320 * WRITE_LOCKED bit is clear, then the owner field is actually a count of 321 * the number of readers. 322 */ 323 #define RW_HAS_WAITERS 0x01 /* lock has waiters */ 324 #define RW_WRITE_WANTED 0x02 /* >= 1 waiter is a writer */ 325 #define RW_WRITE_LOCKED 0x04 /* lock is currently write locked */ 326 #define RW_UNUSED 0x08 /* currently unused */ 327 328 #define RW_FLAGMASK 0x0f 329 330 #define RW_READ_COUNT_SHIFT 4 331 #define RW_READ_INCR (1 << RW_READ_COUNT_SHIFT) 332 #define RW_THREAD ((uintptr_t)-RW_READ_INCR) 333 334 #endif /* _LIB_PTHREAD_INT_H */ 335
Indexes created Sun Sep 21 20:09:37 GMT 2025