1 /* $NetBSD: pthread_int.h,v 1.88 2012/11/21 19:19:24 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/rbtree.h> 54 55 #include <limits.h> 56 #include <lwp.h> 57 #include <signal.h> 58 #include <stdbool.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__UNPARK_MAX 32 67 68 /* 69 * The size of this structure needs to be no larger than struct 70 * __pthread_cleanup_store, defined in pthread.h. 71 */ 72 struct pt_clean_t { 73 PTQ_ENTRY(pt_clean_t) ptc_next; 74 void (*ptc_cleanup)(void *); 75 void *ptc_arg; 76 }; 77 78 /* Private data for pthread_attr_t */ 79 struct pthread_attr_private { 80 char ptap_name[PTHREAD_MAX_NAMELEN_NP]; 81 void *ptap_namearg; 82 void *ptap_stackaddr; 83 size_t ptap_stacksize; 84 size_t ptap_guardsize; 85 struct sched_param ptap_sp; 86 int ptap_policy; 87 }; 88 89 struct pthread_lock_ops { 90 void (*plo_init)(__cpu_simple_lock_t *); 91 int (*plo_try)(__cpu_simple_lock_t *); 92 void (*plo_unlock)(__cpu_simple_lock_t *); 93 void (*plo_lock)(__cpu_simple_lock_t *); 94 }; 95 96 struct __pthread_st { 97 pthread_t pt_self; /* Must be first. */ 98 #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II) 99 struct tls_tcb *pt_tls; /* Thread Local Storage area */ 100 #endif 101 unsigned int pt_magic; /* Magic number */ 102 int pt_state; /* running, blocked, etc. */ 103 pthread_mutex_t pt_lock; /* lock on state */ 104 int pt_flags; /* see PT_FLAG_* below */ 105 int pt_cancel; /* Deferred cancellation */ 106 int pt_errno; /* Thread-specific errno. */ 107 stack_t pt_stack; /* Our stack */ 108 bool pt_stack_allocated; 109 size_t pt_guardsize; 110 void *pt_exitval; /* Read by pthread_join() */ 111 char *pt_name; /* Thread's name, set by the app. */ 112 int pt_willpark; /* About to park */ 113 lwpid_t pt_unpark; /* Unpark this when parking */ 114 struct pthread_lock_ops pt_lockops;/* Cached to avoid PIC overhead */ 115 pthread_mutex_t *pt_droplock; /* Drop this lock if cancelled */ 116 pthread_cond_t pt_joiners; /* Threads waiting to join. */ 117 void *(*pt_func)(void *);/* Function to call at start. */ 118 void *pt_arg; /* Argument to pass at start. */ 119 120 /* Threads to defer waking, usually until pthread_mutex_unlock(). */ 121 lwpid_t pt_waiters[PTHREAD__UNPARK_MAX]; 122 size_t pt_nwaiters; 123 124 /* Stack of cancellation cleanup handlers and their arguments */ 125 PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; 126 127 /* LWP ID and entry on the list of all threads. */ 128 lwpid_t pt_lid; 129 rb_node_t pt_alltree; 130 PTQ_ENTRY(__pthread_st) pt_allq; 131 PTQ_ENTRY(__pthread_st) pt_deadq; 132 133 /* 134 * General synchronization data. We try to align, as threads 135 * on other CPUs will access this data frequently. 136 */ 137 int pt_dummy1 __aligned(128); 138 struct lwpctl *pt_lwpctl; /* Kernel/user comms area */ 139 volatile int pt_blocking; /* Blocking in userspace */ 140 volatile int pt_rwlocked; /* Handed rwlock successfully */ 141 volatile int pt_signalled; /* Received pthread_cond_signal() */ 142 volatile int pt_mutexwait; /* Waiting to acquire mutex */ 143 void * volatile pt_mutexnext; /* Next thread in chain */ 144 void * volatile pt_sleepobj; /* Object slept on */ 145 PTQ_ENTRY(__pthread_st) pt_sleep; 146 void (*pt_early)(void *); 147 int pt_dummy2 __aligned(128); 148 149 /* Thread-specific data. Large so it sits close to the end. */ 150 int pt_havespecific; 151 struct pt_specific { 152 void *pts_value; 153 PTQ_ENTRY(pt_specific) pts_next; 154 } pt_specific[PTHREAD_KEYS_MAX]; 155 156 /* 157 * Context for thread creation. At the end as it's cached 158 * and then only ever passed to _lwp_create(). 159 */ 160 ucontext_t pt_uc; 161 }; 162 163 /* Thread states */ 164 #define PT_STATE_RUNNING 1 165 #define PT_STATE_ZOMBIE 5 166 #define PT_STATE_DEAD 6 167 168 /* Flag values */ 169 170 #define PT_FLAG_DETACHED 0x0001 171 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ 172 #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ 173 #define PT_FLAG_CS_PENDING 0x0010 174 #define PT_FLAG_SCOPE_SYSTEM 0x0040 175 #define PT_FLAG_EXPLICIT_SCHED 0x0080 176 #define PT_FLAG_SUSPENDED 0x0100 /* In the suspended queue */ 177 178 #define PT_MAGIC 0x11110001 179 #define PT_DEAD 0xDEAD0001 180 181 #define PT_ATTR_MAGIC 0x22220002 182 #define PT_ATTR_DEAD 0xDEAD0002 183 184 extern size_t pthread__stacksize; 185 extern size_t pthread__pagesize; 186 extern int pthread__nspins; 187 extern int pthread__concurrency; 188 extern int pthread__osrev; 189 extern int pthread__unpark_max; 190 191 /* Flag to be used in a ucontext_t's uc_flags indicating that 192 * the saved register state is "user" state only, not full 193 * trap state. 194 */ 195 #define _UC_USER_BIT 30 196 #define _UC_USER (1LU << _UC_USER_BIT) 197 198 /* Utility functions */ 199 void pthread__unpark_all(pthread_queue_t *, pthread_t, pthread_mutex_t *) 200 PTHREAD_HIDE; 201 void pthread__unpark(pthread_queue_t *, pthread_t, pthread_mutex_t *) 202 PTHREAD_HIDE; 203 int pthread__park(pthread_t, pthread_mutex_t *, pthread_queue_t *, 204 const struct timespec *, int, const void *) 205 PTHREAD_HIDE; 206 pthread_mutex_t *pthread__hashlock(volatile const void *) PTHREAD_HIDE; 207 208 /* Internal locking primitives */ 209 void pthread__lockprim_init(void) PTHREAD_HIDE; 210 void pthread_lockinit(pthread_spin_t *) PTHREAD_HIDE; 211 212 static inline void pthread__spinlock(pthread_t, pthread_spin_t *) 213 __attribute__((__always_inline__)); 214 static inline void 215 pthread__spinlock(pthread_t self, pthread_spin_t *lock) 216 { 217 if (__predict_true((*self->pt_lockops.plo_try)(lock))) 218 return; 219 (*self->pt_lockops.plo_lock)(lock); 220 } 221 222 static inline int pthread__spintrylock(pthread_t, pthread_spin_t *) 223 __attribute__((__always_inline__)); 224 static inline int 225 pthread__spintrylock(pthread_t self, pthread_spin_t *lock) 226 { 227 return (*self->pt_lockops.plo_try)(lock); 228 } 229 230 static inline void pthread__spinunlock(pthread_t, pthread_spin_t *) 231 __attribute__((__always_inline__)); 232 static inline void 233 pthread__spinunlock(pthread_t self, pthread_spin_t *lock) 234 { 235 (*self->pt_lockops.plo_unlock)(lock); 236 } 237 238 extern const struct pthread_lock_ops *pthread__lock_ops; 239 240 int pthread__simple_locked_p(__cpu_simple_lock_t *) PTHREAD_HIDE; 241 #define pthread__simple_lock_init(alp) (*pthread__lock_ops->plo_init)(alp) 242 #define pthread__simple_lock_try(alp) (*pthread__lock_ops->plo_try)(alp) 243 #define pthread__simple_unlock(alp) (*pthread__lock_ops->plo_unlock)(alp) 244 245 void pthread__testcancel(pthread_t) PTHREAD_HIDE; 246 int pthread__find(pthread_t) PTHREAD_HIDE; 247 248 #ifndef PTHREAD_MD_INIT 249 #define PTHREAD_MD_INIT 250 #endif 251 252 #ifndef _INITCONTEXT_U_MD 253 #define _INITCONTEXT_U_MD(ucp) 254 #endif 255 256 #define _INITCONTEXT_U(ucp) do { \ 257 (ucp)->uc_flags = _UC_CPU | _UC_STACK; \ 258 _INITCONTEXT_U_MD(ucp) \ 259 } while (/*CONSTCOND*/0) 260 261 262 #if !defined(__HAVE_TLS_VARIANT_I) && !defined(__HAVE_TLS_VARIANT_II) 263 #error Either __HAVE_TLS_VARIANT_I or __HAVE_TLS_VARIANT_II must be defined 264 #endif 265 266 static inline pthread_t __constfunc 267 pthread__self(void) 268 { 269 #ifdef __HAVE___LWP_GETTCB_FAST 270 struct tls_tcb * const tcb = __lwp_gettcb_fast(); 271 #else 272 struct tls_tcb * const tcb = __lwp_getprivate_fast(); 273 #endif 274 return (pthread_t)tcb->tcb_pthread; 275 } 276 277 #define pthread__abort() \ 278 pthread__assertfunc(__FILE__, __LINE__, __func__, "unreachable") 279 280 #define pthread__assert(e) do { \ 281 if (__predict_false(!(e))) \ 282 pthread__assertfunc(__FILE__, __LINE__, __func__, #e); \ 283 } while (/*CONSTCOND*/0) 284 285 #define pthread__error(err, msg, e) do { \ 286 if (__predict_false(!(e))) { \ 287 pthread__errorfunc(__FILE__, __LINE__, __func__, msg); \ 288 return (err); \ 289 } \ 290 } while (/*CONSTCOND*/0) 291 292 void pthread__destroy_tsd(pthread_t) PTHREAD_HIDE; 293 __dead void pthread__assertfunc(const char *, int, const char *, const char *) 294 PTHREAD_HIDE; 295 void pthread__errorfunc(const char *, int, const char *, const char *) 296 PTHREAD_HIDE; 297 char *pthread__getenv(const char *) PTHREAD_HIDE; 298 __dead void pthread__cancelled(void) PTHREAD_HIDE; 299 void pthread__mutex_deferwake(pthread_t, pthread_mutex_t *) PTHREAD_HIDE; 300 int pthread__checkpri(int) PTHREAD_HIDE; 301 int pthread__add_specific(pthread_t, pthread_key_t, const void *) PTHREAD_HIDE; 302 303 #ifndef pthread__smt_pause 304 #define pthread__smt_pause() /* nothing */ 305 #endif 306 #ifndef pthread__smt_wake 307 #define pthread__smt_wake() /* nothing */ 308 #endif 309 310 /* 311 * Bits in the owner field of the lock that indicate lock state. If the 312 * WRITE_LOCKED bit is clear, then the owner field is actually a count of 313 * the number of readers. 314 */ 315 #define RW_HAS_WAITERS 0x01 /* lock has waiters */ 316 #define RW_WRITE_WANTED 0x02 /* >= 1 waiter is a writer */ 317 #define RW_WRITE_LOCKED 0x04 /* lock is currently write locked */ 318 #define RW_UNUSED 0x08 /* currently unused */ 319 320 #define RW_FLAGMASK 0x0f 321 322 #define RW_READ_COUNT_SHIFT 4 323 #define RW_READ_INCR (1 << RW_READ_COUNT_SHIFT) 324 #define RW_THREAD ((uintptr_t)-RW_READ_INCR) 325 #define RW_OWNER(rw) ((rw)->rw_owner & RW_THREAD) 326 #define RW_COUNT(rw) ((rw)->rw_owner & RW_THREAD) 327 #define RW_FLAGS(rw) ((rw)->rw_owner & ~RW_THREAD) 328 329 #endif /* _LIB_PTHREAD_INT_H */ 330