pthread_int.h revision 1.70
1 /* $NetBSD: pthread_int.h,v 1.70 2008/06/28 10:29:37 ad 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 /* #define PTHREAD__DEBUG */ 41 #define ERRORCHECK 42 43 #include "pthread_types.h" 44 #include "pthread_queue.h" 45 #include "pthread_md.h" 46 47 /* Need to use libc-private names for atomic operations. */ 48 #include "../../common/lib/libc/atomic/atomic_op_namespace.h" 49 50 #include <sys/atomic.h> 51 #include <sys/tree.h> 52 53 #include <lwp.h> 54 #include <signal.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_KEYS_MAX 256 63 #define PTHREAD__UNPARK_MAX 32 64 65 /* 66 * The size of this structure needs to be no larger than struct 67 * __pthread_cleanup_store, defined in pthread.h. 68 */ 69 struct pt_clean_t { 70 PTQ_ENTRY(pt_clean_t) ptc_next; 71 void (*ptc_cleanup)(void *); 72 void *ptc_arg; 73 }; 74 75 /* Private data for pthread_attr_t */ 76 struct pthread_attr_private { 77 char ptap_name[PTHREAD_MAX_NAMELEN_NP]; 78 void *ptap_namearg; 79 void *ptap_stackaddr; 80 size_t ptap_stacksize; 81 size_t ptap_guardsize; 82 struct sched_param ptap_sp; 83 int ptap_policy; 84 }; 85 86 struct pthread_lock_ops { 87 void (*plo_init)(__cpu_simple_lock_t *); 88 int (*plo_try)(__cpu_simple_lock_t *); 89 void (*plo_unlock)(__cpu_simple_lock_t *); 90 void (*plo_lock)(__cpu_simple_lock_t *); 91 }; 92 93 struct __pthread_st { 94 pthread_t pt_self; /* Must be first. */ 95 unsigned int pt_magic; /* Magic number */ 96 int pt_state; /* running, blocked, etc. */ 97 pthread_mutex_t pt_lock; /* lock on state */ 98 int pt_flags; /* see PT_FLAG_* below */ 99 int pt_cancel; /* Deferred cancellation */ 100 int pt_errno; /* Thread-specific errno. */ 101 stack_t pt_stack; /* Our stack */ 102 void *pt_exitval; /* Read by pthread_join() */ 103 char *pt_name; /* Thread's name, set by the app. */ 104 int pt_willpark; /* About to park */ 105 lwpid_t pt_unpark; /* Unpark this when parking */ 106 struct pthread_lock_ops pt_lockops;/* Cached to avoid PIC overhead */ 107 pthread_mutex_t *pt_droplock; /* Drop this lock if cancelled */ 108 pthread_cond_t pt_joiners; /* Threads waiting to join. */ 109 110 /* Threads to defer waking, usually until pthread_mutex_unlock(). */ 111 lwpid_t pt_waiters[PTHREAD__UNPARK_MAX]; 112 size_t pt_nwaiters; 113 114 /* Stack of cancellation cleanup handlers and their arguments */ 115 PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; 116 117 /* LWP ID and entry on the list of all threads. */ 118 lwpid_t pt_lid; 119 RB_ENTRY(__pthread_st) pt_alltree; 120 PTQ_ENTRY(__pthread_st) pt_allq; 121 PTQ_ENTRY(__pthread_st) pt_deadq; 122 123 /* 124 * General synchronization data. We try to align, as threads 125 * on other CPUs will access this data frequently. 126 */ 127 int pt_dummy1 __aligned(128); 128 struct lwpctl *pt_lwpctl; /* Kernel/user comms area */ 129 volatile int pt_blocking; /* Blocking in userspace */ 130 volatile int pt_rwlocked; /* Handed rwlock successfully */ 131 volatile int pt_signalled; /* Received pthread_cond_signal() */ 132 volatile int pt_mutexwait; /* Waiting to acquire mutex */ 133 void * volatile pt_mutexnext; /* Next thread in chain */ 134 void * volatile pt_sleepobj; /* Object slept on */ 135 PTQ_ENTRY(__pthread_st) pt_sleep; 136 void (*pt_early)(void *); 137 int pt_dummy2 __aligned(128); 138 139 /* Thread-specific data. Large so it sits close to the end. */ 140 int pt_havespecific; 141 void *pt_specific[PTHREAD_KEYS_MAX]; 142 143 /* 144 * Context for thread creation. At the end as it's cached 145 * and then only ever passed to _lwp_create(). 146 */ 147 ucontext_t pt_uc; 148 }; 149 150 /* Thread states */ 151 #define PT_STATE_RUNNING 1 152 #define PT_STATE_ZOMBIE 5 153 #define PT_STATE_DEAD 6 154 155 /* Flag values */ 156 157 #define PT_FLAG_DETACHED 0x0001 158 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ 159 #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ 160 #define PT_FLAG_CS_PENDING 0x0010 161 #define PT_FLAG_SCOPE_SYSTEM 0x0040 162 #define PT_FLAG_EXPLICIT_SCHED 0x0080 163 #define PT_FLAG_SUSPENDED 0x0100 /* In the suspended queue */ 164 165 #define PT_MAGIC 0x11110001 166 #define PT_DEAD 0xDEAD0001 167 168 #define PT_ATTR_MAGIC 0x22220002 169 #define PT_ATTR_DEAD 0xDEAD0002 170 171 extern int pthread__stacksize_lg; 172 extern size_t pthread__stacksize; 173 extern vaddr_t pthread__stackmask; 174 extern vaddr_t pthread__threadmask; 175 extern int pthread__nspins; 176 extern int pthread__concurrency; 177 extern int pthread__osrev; 178 extern int pthread__unpark_max; 179 180 /* Flag to be used in a ucontext_t's uc_flags indicating that 181 * the saved register state is "user" state only, not full 182 * trap state. 183 */ 184 #define _UC_USER_BIT 30 185 #define _UC_USER (1LU << _UC_USER_BIT) 186 187 /* Utility functions */ 188 void pthread__unpark_all(pthread_queue_t *, pthread_t, pthread_mutex_t *) 189 PTHREAD_HIDE; 190 void pthread__unpark(pthread_queue_t *, pthread_t, pthread_mutex_t *) 191 PTHREAD_HIDE; 192 int pthread__park(pthread_t, pthread_mutex_t *, pthread_queue_t *, 193 const struct timespec *, int, const void *) 194 PTHREAD_HIDE; 195 pthread_mutex_t *pthread__hashlock(volatile const void *) PTHREAD_HIDE; 196 197 /* Internal locking primitives */ 198 void pthread__lockprim_init(void) PTHREAD_HIDE; 199 void pthread_lockinit(pthread_spin_t *) PTHREAD_HIDE; 200 201 static inline void pthread__spinlock(pthread_t, pthread_spin_t *) 202 __attribute__((__always_inline__)); 203 static inline void 204 pthread__spinlock(pthread_t self, pthread_spin_t *lock) 205 { 206 if (__predict_true((*self->pt_lockops.plo_try)(lock))) 207 return; 208 (*self->pt_lockops.plo_lock)(lock); 209 } 210 211 static inline int pthread__spintrylock(pthread_t, pthread_spin_t *) 212 __attribute__((__always_inline__)); 213 static inline int 214 pthread__spintrylock(pthread_t self, pthread_spin_t *lock) 215 { 216 return (*self->pt_lockops.plo_try)(lock); 217 } 218 219 static inline void pthread__spinunlock(pthread_t, pthread_spin_t *) 220 __attribute__((__always_inline__)); 221 static inline void 222 pthread__spinunlock(pthread_t self, pthread_spin_t *lock) 223 { 224 (*self->pt_lockops.plo_unlock)(lock); 225 } 226 227 extern const struct pthread_lock_ops *pthread__lock_ops; 228 229 int pthread__simple_locked_p(__cpu_simple_lock_t *) PTHREAD_HIDE; 230 #define pthread__simple_lock_init(alp) (*pthread__lock_ops->plo_init)(alp) 231 #define pthread__simple_lock_try(alp) (*pthread__lock_ops->plo_try)(alp) 232 #define pthread__simple_unlock(alp) (*pthread__lock_ops->plo_unlock)(alp) 233 234 #ifndef _getcontext_u 235 int _getcontext_u(ucontext_t *) PTHREAD_HIDE; 236 #endif 237 #ifndef _setcontext_u 238 int _setcontext_u(const ucontext_t *) PTHREAD_HIDE; 239 #endif 240 #ifndef _swapcontext_u 241 int _swapcontext_u(ucontext_t *, const ucontext_t *) PTHREAD_HIDE; 242 #endif 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 /* Stack location of pointer to a particular thread */ 261 #define pthread__id(sp) \ 262 ((pthread_t) (((vaddr_t)(sp)) & pthread__threadmask)) 263 264 #ifdef PTHREAD__HAVE_THREADREG 265 #define pthread__self() pthread__threadreg_get() 266 #else 267 #define pthread__self() (pthread__id(pthread__sp())) 268 #endif 269 270 #define pthread__abort() \ 271 pthread__assertfunc(__FILE__, __LINE__, __func__, "unreachable") 272 273 #define pthread__assert(e) do { \ 274 if (__predict_false(!(e))) \ 275 pthread__assertfunc(__FILE__, __LINE__, __func__, #e); \ 276 } while (/*CONSTCOND*/0) 277 278 #define pthread__error(err, msg, e) do { \ 279 if (__predict_false(!(e))) { \ 280 pthread__errorfunc(__FILE__, __LINE__, __func__, msg); \ 281 return (err); \ 282 } \ 283 } while (/*CONSTCOND*/0) 284 285 void pthread__destroy_tsd(pthread_t) PTHREAD_HIDE; 286 void pthread__assertfunc(const char *, int, const char *, const char *) 287 PTHREAD_HIDE; 288 void pthread__errorfunc(const char *, int, const char *, const char *) 289 PTHREAD_HIDE; 290 char *pthread__getenv(const char *) PTHREAD_HIDE; 291 void pthread__cancelled(void) PTHREAD_HIDE; 292 void pthread__mutex_deferwake(pthread_t, pthread_mutex_t *) PTHREAD_HIDE; 293 int pthread__checkpri(int) PTHREAD_HIDE; 294 295 #ifndef pthread__smt_pause 296 #define pthread__smt_pause() /* nothing */ 297 #endif 298 299 /* 300 * Bits in the owner field of the lock that indicate lock state. If the 301 * WRITE_LOCKED bit is clear, then the owner field is actually a count of 302 * the number of readers. 303 */ 304 #define RW_HAS_WAITERS 0x01 /* lock has waiters */ 305 #define RW_WRITE_WANTED 0x02 /* >= 1 waiter is a writer */ 306 #define RW_WRITE_LOCKED 0x04 /* lock is currently write locked */ 307 #define RW_UNUSED 0x08 /* currently unused */ 308 309 #define RW_FLAGMASK 0x0f 310 311 #define RW_READ_COUNT_SHIFT 4 312 #define RW_READ_INCR (1 << RW_READ_COUNT_SHIFT) 313 #define RW_THREAD ((uintptr_t)-RW_READ_INCR) 314 #define RW_OWNER(rw) ((rw)->rw_owner & RW_THREAD) 315 #define RW_COUNT(rw) ((rw)->rw_owner & RW_THREAD) 316 #define RW_FLAGS(rw) ((rw)->rw_owner & ~RW_THREAD) 317 318 #endif /* _LIB_PTHREAD_INT_H */ 319
Indexes created Sun Sep 21 20:09:37 GMT 2025