pthread_int.h revision 1.60
1 /* $NetBSD: pthread_int.h,v 1.60 2007/11/13 15:57:11 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2001, 2002, 2003, 2006, 2007 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 and Andrew Doran. 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 /* 40 * NOTE: when changing anything in this file, please ensure that 41 * libpthread_dbg still compiles. 42 */ 43 44 #ifndef _LIB_PTHREAD_INT_H 45 #define _LIB_PTHREAD_INT_H 46 47 /* #define PTHREAD__DEBUG */ 48 #define ERRORCHECK 49 50 #include "pthread_types.h" 51 #include "pthread_queue.h" 52 #include "pthread_debug.h" 53 #include "pthread_md.h" 54 55 #include <sys/tree.h> 56 57 #include <lwp.h> 58 #include <signal.h> 59 60 #ifdef __GNUC__ 61 #define PTHREAD_HIDE __attribute__ ((visibility("hidden"))) 62 #else 63 #define PTHREAD_HIDE /* nothing */ 64 #endif 65 66 #define PTHREAD_KEYS_MAX 256 67 #define PTHREAD__UNPARK_MAX 32 68 69 /* 70 * The size of this structure needs to be no larger than struct 71 * __pthread_cleanup_store, defined in pthread.h. 72 */ 73 struct pt_clean_t { 74 PTQ_ENTRY(pt_clean_t) ptc_next; 75 void (*ptc_cleanup)(void *); 76 void *ptc_arg; 77 }; 78 79 /* Private data for pthread_attr_t */ 80 struct pthread_attr_private { 81 char ptap_name[PTHREAD_MAX_NAMELEN_NP]; 82 void *ptap_namearg; 83 void *ptap_stackaddr; 84 size_t ptap_stacksize; 85 size_t ptap_guardsize; 86 }; 87 88 struct pthread_lock_ops { 89 void (*plo_init)(__cpu_simple_lock_t *); 90 int (*plo_try)(__cpu_simple_lock_t *); 91 void (*plo_unlock)(__cpu_simple_lock_t *); 92 void (*plo_lock)(__cpu_simple_lock_t *); 93 }; 94 95 struct __pthread_st { 96 pthread_t pt_self; /* Must be first. */ 97 unsigned int pt_magic; /* Magic number */ 98 int pt_state; /* running, blocked, etc. */ 99 pthread_mutex_t pt_lock; /* lock on state */ 100 int pt_flags; /* see PT_FLAG_* below */ 101 int pt_cancel; /* Deferred cancellation */ 102 int pt_errno; /* Thread-specific errno. */ 103 stack_t pt_stack; /* Our stack */ 104 void *pt_exitval; /* Read by pthread_join() */ 105 char *pt_name; /* Thread's name, set by the app. */ 106 int pt_willpark; /* About to park */ 107 lwpid_t pt_unpark; /* Unpark this when parking */ 108 void *pt_unparkhint; /* Hint for the above */ 109 struct pthread_lock_ops pt_lockops;/* Cached to avoid PIC overhead */ 110 111 /* Threads to defer waking, usually until pthread_mutex_unlock(). */ 112 lwpid_t pt_waiters[PTHREAD__UNPARK_MAX]; 113 size_t pt_nwaiters; 114 115 /* Stack of cancellation cleanup handlers and their arguments */ 116 PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; 117 118 /* For debugger: LWPs waiting to join. */ 119 pthread_queue_t pt_joiners; 120 PTQ_ENTRY(__pthread_st) pt_joinq; 121 122 /* LWP ID and entry on the list of all threads. */ 123 lwpid_t pt_lid; 124 RB_ENTRY(__pthread_st) pt_alltree; 125 PTQ_ENTRY(__pthread_st) pt_allq; 126 PTQ_ENTRY(__pthread_st) pt_deadq; 127 128 /* 129 * General synchronization data. We try to align, as threads 130 * on other CPUs will access this data frequently. 131 */ 132 int pt_dummy1 __aligned(128); 133 volatile int pt_rwlocked; /* Handed rwlock successfully */ 134 volatile int pt_sleeponq; /* On a sleep queue */ 135 volatile int pt_signalled; /* Received pthread_cond_signal() */ 136 void * volatile pt_sleepobj; /* Object slept on */ 137 PTQ_ENTRY(__pthread_st) pt_sleep; 138 void (*pt_early)(void *); 139 int pt_dummy2 __aligned(128); 140 141 /* Thread-specific data. Large so it sits close to the end. */ 142 int pt_havespecific; 143 void *pt_specific[PTHREAD_KEYS_MAX]; 144 145 /* 146 * Context for thread creation. At the end as it's cached 147 * and then only ever passed to _lwp_create(). 148 */ 149 ucontext_t pt_uc; 150 }; 151 152 /* Thread states */ 153 #define PT_STATE_RUNNING 1 154 #define PT_STATE_ZOMBIE 5 155 #define PT_STATE_DEAD 6 156 157 /* Flag values */ 158 159 #define PT_FLAG_DETACHED 0x0001 160 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ 161 #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ 162 #define PT_FLAG_CS_PENDING 0x0010 163 #define PT_FLAG_SCOPE_SYSTEM 0x0040 164 #define PT_FLAG_EXPLICIT_SCHED 0x0080 165 #define PT_FLAG_SUSPENDED 0x0100 /* In the suspended queue */ 166 167 #define PT_MAGIC 0x11110001 168 #define PT_DEAD 0xDEAD0001 169 170 #define PT_ATTR_MAGIC 0x22220002 171 #define PT_ATTR_DEAD 0xDEAD0002 172 173 extern int pthread__stacksize_lg; 174 extern size_t pthread__stacksize; 175 extern vaddr_t pthread__stackmask; 176 extern vaddr_t pthread__threadmask; 177 extern int pthread__nspins; 178 extern int pthread__concurrency; 179 extern int pthread__osrev; 180 extern int pthread__unpark_max; 181 182 /* Flag to be used in a ucontext_t's uc_flags indicating that 183 * the saved register state is "user" state only, not full 184 * trap state. 185 */ 186 #define _UC_USER_BIT 30 187 #define _UC_USER (1LU << _UC_USER_BIT) 188 189 /* Utility functions */ 190 void pthread__unpark_all(pthread_t, pthread_spin_t *, pthread_queue_t *) 191 PTHREAD_HIDE; 192 void pthread__unpark(pthread_t, pthread_spin_t *, pthread_queue_t *, 193 pthread_t) PTHREAD_HIDE; 194 int pthread__park(pthread_t, pthread_spin_t *, pthread_queue_t *, 195 const struct timespec *, int, const void *) 196 PTHREAD_HIDE; 197 198 /* Internal locking primitives */ 199 void pthread__lockprim_init(void) PTHREAD_HIDE; 200 void pthread_lockinit(pthread_spin_t *) PTHREAD_HIDE; 201 202 static inline void 203 pthread__spinlock(pthread_t self, pthread_spin_t *lock) 204 { 205 if (__predict_true((*self->pt_lockops.plo_try)(lock))) 206 return; 207 (*self->pt_lockops.plo_lock)(lock); 208 } 209 210 static inline int 211 pthread__spintrylock(pthread_t self, pthread_spin_t *lock) 212 { 213 return (*self->pt_lockops.plo_try)(lock); 214 } 215 216 static inline void 217 pthread__spinunlock(pthread_t self, pthread_spin_t *lock) 218 { 219 (*self->pt_lockops.plo_unlock)(lock); 220 } 221 222 extern const struct pthread_lock_ops *pthread__lock_ops; 223 224 int pthread__simple_locked_p(__cpu_simple_lock_t *) PTHREAD_HIDE; 225 #define pthread__simple_lock_init(alp) (*pthread__lock_ops->plo_init)(alp) 226 #define pthread__simple_lock_try(alp) (*pthread__lock_ops->plo_try)(alp) 227 #define pthread__simple_unlock(alp) (*pthread__lock_ops->plo_unlock)(alp) 228 229 #ifndef _getcontext_u 230 int _getcontext_u(ucontext_t *) PTHREAD_HIDE; 231 #endif 232 #ifndef _setcontext_u 233 int _setcontext_u(const ucontext_t *) PTHREAD_HIDE; 234 #endif 235 #ifndef _swapcontext_u 236 int _swapcontext_u(ucontext_t *, const ucontext_t *) PTHREAD_HIDE; 237 #endif 238 239 void pthread__testcancel(pthread_t) PTHREAD_HIDE; 240 int pthread__find(pthread_t) PTHREAD_HIDE; 241 242 #ifndef PTHREAD_MD_INIT 243 #define PTHREAD_MD_INIT 244 #endif 245 246 #ifndef _INITCONTEXT_U_MD 247 #define _INITCONTEXT_U_MD(ucp) 248 #endif 249 250 #define _INITCONTEXT_U(ucp) do { \ 251 (ucp)->uc_flags = _UC_CPU | _UC_STACK; \ 252 _INITCONTEXT_U_MD(ucp) \ 253 } while (/*CONSTCOND*/0) 254 255 #ifdef PTHREAD_MACHINE_HAS_ID_REGISTER 256 #define pthread__id(reg) (reg) 257 #else 258 /* Stack location of pointer to a particular thread */ 259 #define pthread__id(sp) \ 260 ((pthread_t) (((vaddr_t)(sp)) & pthread__threadmask)) 261 262 #define pthread__id_reg() pthread__sp() 263 #endif 264 265 #define pthread__self() (pthread__id(pthread__id_reg())) 266 267 #define pthread__abort() \ 268 pthread__assertfunc(__FILE__, __LINE__, __func__, "unreachable") 269 270 #define pthread__assert(e) do { \ 271 if (__predict_false(!(e))) \ 272 pthread__assertfunc(__FILE__, __LINE__, __func__, #e); \ 273 } while (/*CONSTCOND*/0) 274 275 #define pthread__error(err, msg, e) do { \ 276 if (__predict_false(!(e))) { \ 277 pthread__errorfunc(__FILE__, __LINE__, __func__, msg); \ 278 return (err); \ 279 } \ 280 } while (/*CONSTCOND*/0) 281 282 void pthread__destroy_tsd(pthread_t) PTHREAD_HIDE; 283 void pthread__assertfunc(const char *, int, const char *, const char *) 284 PTHREAD_HIDE; 285 void pthread__errorfunc(const char *, int, const char *, const char *) 286 PTHREAD_HIDE; 287 char *pthread__getenv(const char *) PTHREAD_HIDE; 288 289 int pthread__atomic_cas_ptr(volatile void *, void **, void *) PTHREAD_HIDE; 290 void *pthread__atomic_swap_ptr(volatile void *, void *) PTHREAD_HIDE; 291 void pthread__membar_full(void) PTHREAD_HIDE; 292 void pthread__membar_producer(void) PTHREAD_HIDE; 293 void pthread__membar_consumer(void) PTHREAD_HIDE; 294 295 int pthread__mutex_deferwake(pthread_t, pthread_mutex_t *) PTHREAD_HIDE; 296 int pthread__mutex_catchup(pthread_mutex_t *) PTHREAD_HIDE; 297 298 #ifndef pthread__smt_pause 299 #define pthread__smt_pause() /* nothing */ 300 #endif 301 302 /* 303 * Bits in the owner field of the lock that indicate lock state. If the 304 * WRITE_LOCKED bit is clear, then the owner field is actually a count of 305 * the number of readers. 306 */ 307 #define RW_HAS_WAITERS 0x01 /* lock has waiters */ 308 #define RW_WRITE_WANTED 0x02 /* >= 1 waiter is a writer */ 309 #define RW_WRITE_LOCKED 0x04 /* lock is currently write locked */ 310 #define RW_UNUSED 0x08 /* currently unused */ 311 312 #define RW_FLAGMASK 0x0f 313 314 #define RW_READ_COUNT_SHIFT 4 315 #define RW_READ_INCR (1 << RW_READ_COUNT_SHIFT) 316 #define RW_THREAD ((uintptr_t)-RW_READ_INCR) 317 #define RW_OWNER(rw) ((rw)->rw_owner & RW_THREAD) 318 #define RW_COUNT(rw) ((rw)->rw_owner & RW_THREAD) 319 #define RW_FLAGS(rw) ((rw)->rw_owner & ~RW_THREAD) 320 321 #define ptr_owner ptr_writer 322 323 #endif /* _LIB_PTHREAD_INT_H */ 324
Indexes created Tue Sep 23 14:10:03 GMT 2025