pthread_int.h revision 1.1.2.36
1 /* $NetBSD: pthread_int.h,v 1.1.2.36 2002/12/16 18:17:46 nathanw Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 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. 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 #ifndef _LIB_PTHREAD_INT_H 40 #define _LIB_PTHREAD_INT_H 41 42 #include <sa.h> 43 #include <signal.h> 44 45 #define PTHREAD__DEBUG 46 #define ERRORCHECK 47 48 #include "pthread_types.h" 49 #include "pthread_queue.h" 50 51 /* 52 * The size of this structure needs to be no larger than struct 53 * __pthread_cleanup_store, defined in pthread.h. 54 */ 55 struct pt_clean_t { 56 PTQ_ENTRY(pt_clean_t) ptc_next; 57 void (*ptc_cleanup)(void *); 58 void *ptc_arg; 59 }; 60 61 struct pt_alarm_t { 62 PTQ_ENTRY(pt_alarm_t) pta_next; 63 pthread_spin_t pta_lock; 64 const struct timespec *pta_time; 65 void (*pta_func)(void *); 66 void *pta_arg; 67 int pta_fired; 68 }; 69 70 struct pthread_st { 71 unsigned int pt_magic; 72 73 int pt_type; /* normal, upcall, or idle */ 74 int pt_state; /* running, blocked, etc. */ 75 pthread_spin_t pt_statelock; /* lock on pt_state */ 76 int pt_flags; /* see PT_FLAG_* below */ 77 int pt_cancel; /* Deferred cancellation */ 78 int pt_spinlocks; /* Number of spinlocks held. */ 79 int pt_blockedlwp; /* LWP/SA number when blocked */ 80 81 int pt_errno; /* Thread-specific errno. */ 82 83 /* Entry on the run queue */ 84 PTQ_ENTRY(pthread_st) pt_runq; 85 /* Entry on the list of all threads */ 86 PTQ_ENTRY(pthread_st) pt_allq; 87 /* Entry on the sleep queue (xxx should be same as run queue?) */ 88 PTQ_ENTRY(pthread_st) pt_sleep; 89 /* Object we're sleeping on */ 90 void *pt_sleepobj; 91 /* Queue we're sleeping on */ 92 struct pthread_queue_t *pt_sleepq; 93 /* Lock protecting that queue */ 94 pthread_spin_t *pt_sleeplock; 95 96 stack_t pt_stack; /* Our stack */ 97 ucontext_t *pt_uc; /* Saved context when we're stopped */ 98 99 sigset_t pt_sigmask; /* Signals we won't take. */ 100 sigset_t pt_siglist; /* Signals pending for us. */ 101 pthread_spin_t pt_siglock; /* Lock on above */ 102 103 void * pt_exitval; /* Read by pthread_join() */ 104 105 /* Stack of cancellation cleanup handlers and their arguments */ 106 PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; 107 108 /* Other threads trying to pthread_join() us. */ 109 struct pthread_queue_t pt_joiners; 110 /* Lock for above, and for changing pt_state to ZOMBIE or DEAD, 111 * and for setting the DETACHED flag 112 */ 113 pthread_spin_t pt_join_lock; 114 115 /* Thread we were going to switch to before we were preempted 116 * ourselves. Will be used by the upcall that's continuing us. 117 */ 118 pthread_t pt_switchto; 119 ucontext_t* pt_switchtouc; 120 121 /* The context we saved in pthread__locked_switch but which 122 * was trashed when we were preempted before switching stacks. 123 */ 124 ucontext_t* pt_sleepuc; 125 126 /* Threads that are preempted with spinlocks held will be 127 * continued until they unlock their spinlock. When they do 128 * so, they should jump ship to the thread pointed to by 129 * pt_next. 130 */ 131 pthread_t pt_next; 132 133 /* The upcall that is continuing this thread */ 134 pthread_t pt_parent; 135 136 /* A queue lock that this thread held while trying to 137 * context switch to another process. 138 */ 139 pthread_spin_t* pt_heldlock; 140 141 /* Identifier, for debugging. */ 142 int pt_num; 143 144 /* Thread-specific data */ 145 void* pt_specific[PTHREAD_KEYS_MAX]; 146 147 #ifdef PTHREAD__DEBUG 148 int blocks; 149 int preempts; 150 int rescheds; 151 #endif 152 }; 153 154 155 156 /* Thread types */ 157 #define PT_THREAD_NORMAL 1 158 #define PT_THREAD_UPCALL 2 159 #define PT_THREAD_IDLE 3 160 161 /* Thread states */ 162 #define PT_STATE_RUNNING 1 163 #define PT_STATE_RUNNABLE 2 164 #define PT_STATE_BLOCKED_SYS 3 165 #define PT_STATE_BLOCKED_QUEUE 4 166 #define PT_STATE_ZOMBIE 5 167 #define PT_STATE_DEAD 6 168 #define PT_STATE_RECYCLABLE 7 169 170 /* Flag values */ 171 172 #define PT_FLAG_DETACHED 0x0001 173 #define PT_FLAG_IDLED 0x0002 174 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ 175 #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ 176 #define PT_FLAG_CS_PENDING 0x0010 177 #define PT_FLAG_SIGCATCH 0x0020 /* Interrupt sleep on a signal */ 178 179 #define PT_MAGIC 0x11110001 180 #define PT_DEAD 0xDEAD0001 181 182 #define PT_ATTR_MAGIC 0x22220002 183 #define PT_ATTR_DEAD 0xDEAD0002 184 185 #define PT_STACKSIZE (1<<18) 186 #define PT_STACKMASK (PT_STACKSIZE-1) 187 188 #define PT_UPCALLSTACKS 16 189 190 #define PT_ALARMTIMER_MAGIC 0x88880010 191 #define PT_RRTIMER_MAGIC 0x88880020 192 #define NIDLETHREADS 4 193 #define IDLESPINS 1000 194 195 /* Flag to be used in a ucontext_t's uc_flags indicating that 196 * the saved register state is "user" state only, not full 197 * trap state. 198 */ 199 #define _UC_USER_BIT 30 200 #define _UC_USER (1LU << _UC_USER_BIT) 201 202 void pthread_init(void) __attribute__ ((__constructor__)); 203 204 /* Utility functions */ 205 206 /* Set up/clean up a thread's basic state. */ 207 void pthread__initthread(pthread_t self, pthread_t t); 208 209 /* Go do something else. Don't go back on the run queue */ 210 void pthread__block(pthread_t self, pthread_spin_t* queuelock); 211 /* Put a thread back on the run queue */ 212 void pthread__sched(pthread_t self, pthread_t thread); 213 void pthread__sched_idle(pthread_t self, pthread_t thread); 214 void pthread__sched_idle2(pthread_t self); 215 216 void pthread__sched_bulk(pthread_t self, pthread_t qhead); 217 218 void pthread__idle(void); 219 220 /* Get the next thread */ 221 pthread_t pthread__next(pthread_t self); 222 223 int pthread__stackalloc(pthread_t *t); 224 void pthread__initmain(pthread_t *t); 225 226 void pthread__sa_start(void); 227 void pthread__sa_recycle(pthread_t old, pthread_t new); 228 229 /* Alarm code */ 230 void pthread__alarm_init(void); 231 void pthread__alarm_add(pthread_t, struct pt_alarm_t *, 232 const struct timespec *, void (*)(void *), void *); 233 void pthread__alarm_del(pthread_t, struct pt_alarm_t *); 234 int pthread__alarm_fired(struct pt_alarm_t *); 235 void pthread__alarm_process(pthread_t self, void *arg); 236 237 /* Internal locking primitives */ 238 void pthread_lockinit(pthread_spin_t *lock); 239 void pthread_spinlock(pthread_t thread, pthread_spin_t *lock); 240 int pthread_spintrylock(pthread_t thread, pthread_spin_t *lock); 241 void pthread_spinunlock(pthread_t thread, pthread_spin_t *lock); 242 243 int _getcontext_u(ucontext_t *); 244 int _setcontext_u(const ucontext_t *); 245 int _swapcontext_u(ucontext_t *, const ucontext_t *); 246 247 void pthread__testcancel(pthread_t self); 248 int pthread__find(pthread_t self, pthread_t target); 249 250 #include "pthread_md.h" 251 252 #ifndef PTHREAD_MD_INIT 253 #define PTHREAD_MD_INIT 254 #endif 255 256 #ifndef _INITCONTEXT_U_MD 257 #define _INITCONTEXT_U_MD(ucp) 258 #endif 259 260 #define _INITCONTEXT_U(ucp) do { \ 261 (ucp)->uc_flags = _UC_CPU | _UC_STACK; \ 262 _INITCONTEXT_U_MD(ucp) \ 263 } while (0) 264 265 /* Stack location of pointer to a particular thread */ 266 #define pthread__id(sp) \ 267 ((pthread_t) (((vaddr_t)(sp)) & ~PT_STACKMASK)) 268 269 #define pthread__self() (pthread__id(pthread__sp())) 270 271 /* These three routines are defined in processor-specific code. */ 272 void pthread__upcall_switch(pthread_t self, pthread_t next); 273 void pthread__switch(pthread_t self, pthread_t next); 274 void pthread__locked_switch(pthread_t self, pthread_t next, 275 pthread_spin_t *lock); 276 277 void pthread__signal_init(void); 278 279 void pthread__signal(pthread_t t, int sig, int code); 280 281 void pthread__destroy_tsd(pthread_t self); 282 283 284 #define PTHREADD_CREATE 0 285 #define PTHREADD_IDLE 1 286 #define PTHREADD_UPCALLS 2 287 #define PTHREADD_UP_BLOCK 3 288 #define PTHREADD_UP_NEW 4 289 #define PTHREADD_UP_PREEMPT 5 290 #define PTHREADD_UP_UNBLOCK 6 291 #define PTHREADD_UP_SIGNAL 7 292 #define PTHREADD_UP_SIGEV 8 293 #define PTHREADD_SPINLOCKS 9 294 #define PTHREADD_SPINUNLOCKS 10 295 #define PTHREADD_SPINPREEMPT 11 296 #define PTHREADD_RESOLVELOCKS 12 297 #define PTHREADD_SWITCHTO 13 298 #define PTHREADD_NCOUNTERS 14 299 300 #ifdef PTHREAD__DEBUG 301 302 #define PTHREAD__DEBUG_SHMKEY (0x000f) 303 #define PTHREAD__DEBUG_SHMSIZE (1<<18) 304 305 extern int pthread__debug_counters[PTHREADD_NCOUNTERS]; 306 307 extern int pthread__dbg; /* Set by libpthread_dbg */ 308 309 #define PTHREADD_ADD(x) (pthread__debug_counters[(x)]++) 310 311 #define DPRINTF(x) pthread__debuglog_printf x 312 313 struct pthread_msgbuf { 314 #define BUF_MAGIC 0x090976 315 int msg_magic; 316 long msg_bufw; 317 long msg_bufr; 318 long msg_bufs; 319 char msg_bufc[1]; 320 }; 321 322 void pthread__debug_init(void); 323 struct pthread_msgbuf* pthread__debuglog_init(int force); 324 void pthread__debuglog_printf(const char *fmt, ...); 325 326 #else /* PTHREAD_DEBUG */ 327 328 #define PTHREADD_ADD(x) 329 #define DPRINTF(x) 330 331 #endif /* PTHREAD_DEBUG */ 332 333 #endif /* _LIB_PTHREAD_INT_H */ 334
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