pthread_int.h revision 1.81
1 /* $NetBSD: pthread_int.h,v 1.81 2011/10/06 16:03:48 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * NOTE: when changing anything in this file, please ensure that 34 * libpthread_dbg still compiles. 35 */ 36 37 #ifndef _LIB_PTHREAD_INT_H 38 #define _LIB_PTHREAD_INT_H 39 40 #include <sys/tls.h> 41 42 /* #define PTHREAD__DEBUG */ 43 #define ERRORCHECK 44 45 #include "pthread_types.h" 46 #include "pthread_queue.h" 47 #include "pthread_md.h" 48 49 /* Need to use libc-private names for atomic operations. */ 50 #include "../../common/lib/libc/atomic/atomic_op_namespace.h" 51 52 #include <sys/atomic.h> 53 #include <sys/tree.h> 54 55 #include <lwp.h> 56 #include <signal.h> 57 #include <limits.h> 58 59 #ifdef __GNUC__ 60 #define PTHREAD_HIDE __attribute__ ((visibility("hidden"))) 61 #else 62 #define PTHREAD_HIDE /* nothing */ 63 #endif 64 65 #define PTHREAD__UNPARK_MAX 32 66 67 /* 68 * The size of this structure needs to be no larger than struct 69 * __pthread_cleanup_store, defined in pthread.h. 70 */ 71 struct pt_clean_t { 72 PTQ_ENTRY(pt_clean_t) ptc_next; 73 void (*ptc_cleanup)(void *); 74 void *ptc_arg; 75 }; 76 77 /* Private data for pthread_attr_t */ 78 struct pthread_attr_private { 79 char ptap_name[PTHREAD_MAX_NAMELEN_NP]; 80 void *ptap_namearg; 81 void *ptap_stackaddr; 82 size_t ptap_stacksize; 83 size_t ptap_guardsize; 84 struct sched_param ptap_sp; 85 int ptap_policy; 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 #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II) 98 struct tls_tcb *pt_tls; /* Thread Local Storage area */ 99 #endif 100 unsigned int pt_magic; /* Magic number */ 101 int pt_state; /* running, blocked, etc. */ 102 pthread_mutex_t pt_lock; /* lock on state */ 103 int pt_flags; /* see PT_FLAG_* below */ 104 int pt_cancel; /* Deferred cancellation */ 105 int pt_errno; /* Thread-specific errno. */ 106 stack_t pt_stack; /* Our stack */ 107 void *pt_exitval; /* Read by pthread_join() */ 108 char *pt_name; /* Thread's name, set by the app. */ 109 int pt_willpark; /* About to park */ 110 lwpid_t pt_unpark; /* Unpark this when parking */ 111 struct pthread_lock_ops pt_lockops;/* Cached to avoid PIC overhead */ 112 pthread_mutex_t *pt_droplock; /* Drop this lock if cancelled */ 113 pthread_cond_t pt_joiners; /* Threads waiting to join. */ 114 void *(*pt_func)(void *);/* Function to call at start. */ 115 void *pt_arg; /* Argument to pass at start. */ 116 117 /* Threads to defer waking, usually until pthread_mutex_unlock(). */ 118 lwpid_t pt_waiters[PTHREAD__UNPARK_MAX]; 119 size_t pt_nwaiters; 120 121 /* Stack of cancellation cleanup handlers and their arguments */ 122 PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; 123 124 /* LWP ID and entry on the list of all threads. */ 125 lwpid_t pt_lid; 126 RB_ENTRY(__pthread_st) pt_alltree; 127 PTQ_ENTRY(__pthread_st) pt_allq; 128 PTQ_ENTRY(__pthread_st) pt_deadq; 129 130 /* 131 * General synchronization data. We try to align, as threads 132 * on other CPUs will access this data frequently. 133 */ 134 int pt_dummy1 __aligned(128); 135 struct lwpctl *pt_lwpctl; /* Kernel/user comms area */ 136 volatile int pt_blocking; /* Blocking in userspace */ 137 volatile int pt_rwlocked; /* Handed rwlock successfully */ 138 volatile int pt_signalled; /* Received pthread_cond_signal() */ 139 volatile int pt_mutexwait; /* Waiting to acquire mutex */ 140 void * volatile pt_mutexnext; /* Next thread in chain */ 141 void * volatile pt_sleepobj; /* Object slept on */ 142 PTQ_ENTRY(__pthread_st) pt_sleep; 143 void (*pt_early)(void *); 144 int pt_dummy2 __aligned(128); 145 146 /* Thread-specific data. Large so it sits close to the end. */ 147 int pt_havespecific; 148 void *pt_specific[PTHREAD_KEYS_MAX]; 149 150 /* 151 * Context for thread creation. At the end as it's cached 152 * and then only ever passed to _lwp_create(). 153 */ 154 ucontext_t pt_uc; 155 }; 156 157 /* Thread states */ 158 #define PT_STATE_RUNNING 1 159 #define PT_STATE_ZOMBIE 5 160 #define PT_STATE_DEAD 6 161 162 /* Flag values */ 163 164 #define PT_FLAG_DETACHED 0x0001 165 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ 166 #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ 167 #define PT_FLAG_CS_PENDING 0x0010 168 #define PT_FLAG_SCOPE_SYSTEM 0x0040 169 #define PT_FLAG_EXPLICIT_SCHED 0x0080 170 #define PT_FLAG_SUSPENDED 0x0100 /* In the suspended queue */ 171 172 #define PT_MAGIC 0x11110001 173 #define PT_DEAD 0xDEAD0001 174 175 #define PT_ATTR_MAGIC 0x22220002 176 #define PT_ATTR_DEAD 0xDEAD0002 177 178 extern int pthread__stacksize_lg; 179 extern size_t pthread__stacksize; 180 extern vaddr_t pthread__stackmask; 181 extern vaddr_t pthread__threadmask; 182 extern int pthread__nspins; 183 extern int pthread__concurrency; 184 extern int pthread__osrev; 185 extern int pthread__unpark_max; 186 187 /* Flag to be used in a ucontext_t's uc_flags indicating that 188 * the saved register state is "user" state only, not full 189 * trap state. 190 */ 191 #define _UC_USER_BIT 30 192 #define _UC_USER (1LU << _UC_USER_BIT) 193 194 /* Utility functions */ 195 void pthread__unpark_all(pthread_queue_t *, pthread_t, pthread_mutex_t *) 196 PTHREAD_HIDE; 197 void pthread__unpark(pthread_queue_t *, pthread_t, pthread_mutex_t *) 198 PTHREAD_HIDE; 199 int pthread__park(pthread_t, pthread_mutex_t *, pthread_queue_t *, 200 const struct timespec *, int, const void *) 201 PTHREAD_HIDE; 202 pthread_mutex_t *pthread__hashlock(volatile const void *) PTHREAD_HIDE; 203 204 /* Internal locking primitives */ 205 void pthread__lockprim_init(void) PTHREAD_HIDE; 206 void pthread_lockinit(pthread_spin_t *) PTHREAD_HIDE; 207 208 static inline void pthread__spinlock(pthread_t, pthread_spin_t *) 209 __attribute__((__always_inline__)); 210 static inline void 211 pthread__spinlock(pthread_t self, pthread_spin_t *lock) 212 { 213 if (__predict_true((*self->pt_lockops.plo_try)(lock))) 214 return; 215 (*self->pt_lockops.plo_lock)(lock); 216 } 217 218 static inline int pthread__spintrylock(pthread_t, pthread_spin_t *) 219 __attribute__((__always_inline__)); 220 static inline int 221 pthread__spintrylock(pthread_t self, pthread_spin_t *lock) 222 { 223 return (*self->pt_lockops.plo_try)(lock); 224 } 225 226 static inline void pthread__spinunlock(pthread_t, pthread_spin_t *) 227 __attribute__((__always_inline__)); 228 static inline void 229 pthread__spinunlock(pthread_t self, pthread_spin_t *lock) 230 { 231 (*self->pt_lockops.plo_unlock)(lock); 232 } 233 234 extern const struct pthread_lock_ops *pthread__lock_ops; 235 236 int pthread__simple_locked_p(__cpu_simple_lock_t *) PTHREAD_HIDE; 237 #define pthread__simple_lock_init(alp) (*pthread__lock_ops->plo_init)(alp) 238 #define pthread__simple_lock_try(alp) (*pthread__lock_ops->plo_try)(alp) 239 #define pthread__simple_unlock(alp) (*pthread__lock_ops->plo_unlock)(alp) 240 241 void pthread__testcancel(pthread_t) PTHREAD_HIDE; 242 int pthread__find(pthread_t) PTHREAD_HIDE; 243 244 #ifndef PTHREAD_MD_INIT 245 #define PTHREAD_MD_INIT 246 #endif 247 248 #ifndef _INITCONTEXT_U_MD 249 #define _INITCONTEXT_U_MD(ucp) 250 #endif 251 252 #define _INITCONTEXT_U(ucp) do { \ 253 (ucp)->uc_flags = _UC_CPU | _UC_STACK; \ 254 _INITCONTEXT_U_MD(ucp) \ 255 } while (/*CONSTCOND*/0) 256 257 258 #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II) 259 static inline pthread_t __constfunc 260 pthread__self(void) 261 { 262 #ifdef __HAVE___LWP_GETTCB_FAST 263 struct tls_tcb * const tcb = __lwp_gettcb_fast(); 264 #else 265 struct tls_tcb * const tcb = __lwp_getprivate_fast(); 266 #endif 267 return (pthread_t)tcb->tcb_pthread; 268 } 269 #elif 0 && defined(__HAVE___LWP_GETPRIVATE_FAST) 270 static inline pthread_t __constfunc 271 pthread__self(void) 272 { 273 return (pthread_t)__lwp_getprivate_fast(); 274 } 275 #else 276 /* Stack location of pointer to a particular thread */ 277 extern vaddr_t pthread__mainbase; 278 extern vaddr_t pthread__mainstruct; 279 static inline pthread_t 280 pthread__id(vaddr_t sp) { 281 vaddr_t va = sp & pthread__threadmask; 282 return (pthread_t)(va == pthread__mainbase ? pthread__mainstruct : va); 283 } 284 #define pthread__self() (pthread__id(pthread__sp())) 285 #endif 286 287 #define pthread__abort() \ 288 pthread__assertfunc(__FILE__, __LINE__, __func__, "unreachable") 289 290 #define pthread__assert(e) do { \ 291 if (__predict_false(!(e))) \ 292 pthread__assertfunc(__FILE__, __LINE__, __func__, #e); \ 293 } while (/*CONSTCOND*/0) 294 295 #define pthread__error(err, msg, e) do { \ 296 if (__predict_false(!(e))) { \ 297 pthread__errorfunc(__FILE__, __LINE__, __func__, msg); \ 298 return (err); \ 299 } \ 300 } while (/*CONSTCOND*/0) 301 302 void pthread__destroy_tsd(pthread_t) PTHREAD_HIDE; 303 __dead void pthread__assertfunc(const char *, int, const char *, const char *) 304 PTHREAD_HIDE; 305 void pthread__errorfunc(const char *, int, const char *, const char *) 306 PTHREAD_HIDE; 307 char *pthread__getenv(const char *) PTHREAD_HIDE; 308 __dead void pthread__cancelled(void) PTHREAD_HIDE; 309 void pthread__mutex_deferwake(pthread_t, pthread_mutex_t *) PTHREAD_HIDE; 310 int pthread__checkpri(int) PTHREAD_HIDE; 311 312 #ifndef pthread__smt_pause 313 #define pthread__smt_pause() /* nothing */ 314 #endif 315 316 /* 317 * Bits in the owner field of the lock that indicate lock state. If the 318 * WRITE_LOCKED bit is clear, then the owner field is actually a count of 319 * the number of readers. 320 */ 321 #define RW_HAS_WAITERS 0x01 /* lock has waiters */ 322 #define RW_WRITE_WANTED 0x02 /* >= 1 waiter is a writer */ 323 #define RW_WRITE_LOCKED 0x04 /* lock is currently write locked */ 324 #define RW_UNUSED 0x08 /* currently unused */ 325 326 #define RW_FLAGMASK 0x0f 327 328 #define RW_READ_COUNT_SHIFT 4 329 #define RW_READ_INCR (1 << RW_READ_COUNT_SHIFT) 330 #define RW_THREAD ((uintptr_t)-RW_READ_INCR) 331 #define RW_OWNER(rw) ((rw)->rw_owner & RW_THREAD) 332 #define RW_COUNT(rw) ((rw)->rw_owner & RW_THREAD) 333 #define RW_FLAGS(rw) ((rw)->rw_owner & ~RW_THREAD) 334 335 #endif /* _LIB_PTHREAD_INT_H */ 336
Indexes created Sun Sep 21 19:09:51 GMT 2025