pthread_int.h revision 1.1.2.35
1 /* $NetBSD: pthread_int.h,v 1.1.2.35 2002/11/03 12:29:03 skrll 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 const struct timespec *pta_time; 64 void (*pta_func)(void *); 65 void *pta_arg; 66 int pta_fired; 67 }; 68 69 struct pthread_st { 70 unsigned int pt_magic; 71 72 int pt_type; /* normal, upcall, or idle */ 73 int pt_state; /* running, blocked, etc. */ 74 pthread_spin_t pt_statelock; /* lock on pt_state */ 75 int pt_flags; /* see PT_FLAG_* below */ 76 int pt_cancel; /* Deferred cancellation */ 77 int pt_spinlocks; /* Number of spinlocks held. */ 78 int pt_blockedlwp; /* LWP/SA number when blocked */ 79 80 int pt_errno; /* Thread-specific errno. */ 81 82 /* Entry on the run queue */ 83 PTQ_ENTRY(pthread_st) pt_runq; 84 /* Entry on the list of all threads */ 85 PTQ_ENTRY(pthread_st) pt_allq; 86 /* Entry on the sleep queue (xxx should be same as run queue?) */ 87 PTQ_ENTRY(pthread_st) pt_sleep; 88 /* Object we're sleeping on */ 89 void *pt_sleepobj; 90 /* Queue we're sleeping on */ 91 struct pthread_queue_t *pt_sleepq; 92 /* Lock protecting that queue */ 93 pthread_spin_t *pt_sleeplock; 94 95 stack_t pt_stack; /* Our stack */ 96 ucontext_t *pt_uc; /* Saved context when we're stopped */ 97 98 sigset_t pt_sigmask; /* Signals we won't take. */ 99 sigset_t pt_siglist; /* Signals pending for us. */ 100 pthread_spin_t pt_siglock; /* Lock on above */ 101 102 void * pt_exitval; /* Read by pthread_join() */ 103 104 /* Stack of cancellation cleanup handlers and their arguments */ 105 PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; 106 107 /* Other threads trying to pthread_join() us. */ 108 struct pthread_queue_t pt_joiners; 109 /* Lock for above, and for changing pt_state to ZOMBIE or DEAD, 110 * and for setting the DETACHED flag 111 */ 112 pthread_spin_t pt_join_lock; 113 114 /* Thread we were going to switch to before we were preempted 115 * ourselves. Will be used by the upcall that's continuing us. 116 */ 117 pthread_t pt_switchto; 118 ucontext_t* pt_switchtouc; 119 120 /* The context we saved in pthread__locked_switch but which 121 * was trashed when we were preempted before switching stacks. 122 */ 123 ucontext_t* pt_sleepuc; 124 125 /* Threads that are preempted with spinlocks held will be 126 * continued until they unlock their spinlock. When they do 127 * so, they should jump ship to the thread pointed to by 128 * pt_next. 129 */ 130 pthread_t pt_next; 131 132 /* The upcall that is continuing this thread */ 133 pthread_t pt_parent; 134 135 /* A queue lock that this thread held while trying to 136 * context switch to another process. 137 */ 138 pthread_spin_t* pt_heldlock; 139 140 /* Identifier, for debugging. */ 141 int pt_num; 142 143 /* Thread-specific data */ 144 void* pt_specific[PTHREAD_KEYS_MAX]; 145 146 #ifdef PTHREAD__DEBUG 147 int blocks; 148 int preempts; 149 int rescheds; 150 #endif 151 }; 152 153 154 155 /* Thread types */ 156 #define PT_THREAD_NORMAL 1 157 #define PT_THREAD_UPCALL 2 158 #define PT_THREAD_IDLE 3 159 160 /* Thread states */ 161 #define PT_STATE_RUNNING 1 162 #define PT_STATE_RUNNABLE 2 163 #define PT_STATE_BLOCKED_SYS 3 164 #define PT_STATE_BLOCKED_QUEUE 4 165 #define PT_STATE_ZOMBIE 5 166 #define PT_STATE_DEAD 6 167 #define PT_STATE_RECYCLABLE 7 168 169 /* Flag values */ 170 171 #define PT_FLAG_DETACHED 0x0001 172 #define PT_FLAG_IDLED 0x0002 173 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ 174 #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ 175 #define PT_FLAG_CS_PENDING 0x0010 176 #define PT_FLAG_SIGCATCH 0x0020 /* Interrupt sleep on a signal */ 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 #define PT_STACKSIZE (1<<18) 185 #define PT_STACKMASK (PT_STACKSIZE-1) 186 187 #define PT_UPCALLSTACKS 16 188 189 #define PT_ALARMTIMER_MAGIC 0x88880010 190 #define PT_RRTIMER_MAGIC 0x88880020 191 #define NIDLETHREADS 4 192 #define IDLESPINS 1000 193 194 /* Flag to be used in a ucontext_t's uc_flags indicating that 195 * the saved register state is "user" state only, not full 196 * trap state. 197 */ 198 #define _UC_USER_BIT 30 199 #define _UC_USER (1LU << _UC_USER_BIT) 200 201 void pthread_init(void) __attribute__ ((__constructor__)); 202 203 /* Utility functions */ 204 205 /* Set up/clean up a thread's basic state. */ 206 void pthread__initthread(pthread_t self, pthread_t t); 207 208 /* Go do something else. Don't go back on the run queue */ 209 void pthread__block(pthread_t self, pthread_spin_t* queuelock); 210 /* Put a thread back on the run queue */ 211 void pthread__sched(pthread_t self, pthread_t thread); 212 void pthread__sched_idle(pthread_t self, pthread_t thread); 213 void pthread__sched_idle2(pthread_t self); 214 215 void pthread__sched_bulk(pthread_t self, pthread_t qhead); 216 217 void pthread__idle(void); 218 219 /* Get the next thread */ 220 pthread_t pthread__next(pthread_t self); 221 222 int pthread__stackalloc(pthread_t *t); 223 void pthread__initmain(pthread_t *t); 224 225 void pthread__sa_start(void); 226 void pthread__sa_recycle(pthread_t old, pthread_t new); 227 228 /* Alarm code */ 229 void pthread__alarm_init(void); 230 void pthread__alarm_add(pthread_t, struct pt_alarm_t *, 231 const struct timespec *, void (*)(void *), void *); 232 void pthread__alarm_del(pthread_t, struct pt_alarm_t *); 233 int pthread__alarm_fired(void *); 234 void pthread__alarm_process(pthread_t self, void *arg); 235 236 /* Internal locking primitives */ 237 void pthread_lockinit(pthread_spin_t *lock); 238 void pthread_spinlock(pthread_t thread, pthread_spin_t *lock); 239 int pthread_spintrylock(pthread_t thread, pthread_spin_t *lock); 240 void pthread_spinunlock(pthread_t thread, pthread_spin_t *lock); 241 242 int _getcontext_u(ucontext_t *); 243 int _setcontext_u(const ucontext_t *); 244 int _swapcontext_u(ucontext_t *, const ucontext_t *); 245 246 void pthread__testcancel(pthread_t self); 247 int pthread__find(pthread_t self, pthread_t target); 248 249 #include "pthread_md.h" 250 251 #ifndef PTHREAD_MD_INIT 252 #define PTHREAD_MD_INIT 253 #endif 254 255 #ifndef _INITCONTEXT_U_MD 256 #define _INITCONTEXT_U_MD(ucp) 257 #endif 258 259 #define _INITCONTEXT_U(ucp) do { \ 260 (ucp)->uc_flags = _UC_CPU | _UC_STACK; \ 261 _INITCONTEXT_U_MD(ucp) \ 262 } while (0) 263 264 /* Stack location of pointer to a particular thread */ 265 #define pthread__id(sp) \ 266 ((pthread_t) (((vaddr_t)(sp)) & ~PT_STACKMASK)) 267 268 #define pthread__self() (pthread__id(pthread__sp())) 269 270 /* These three routines are defined in processor-specific code. */ 271 void pthread__upcall_switch(pthread_t self, pthread_t next); 272 void pthread__switch(pthread_t self, pthread_t next); 273 void pthread__locked_switch(pthread_t self, pthread_t next, 274 pthread_spin_t *lock); 275 276 void pthread__signal_init(void); 277 278 void pthread__signal(pthread_t t, int sig, int code); 279 280 void pthread__destroy_tsd(pthread_t self); 281 282 283 #define PTHREADD_CREATE 0 284 #define PTHREADD_IDLE 1 285 #define PTHREADD_UPCALLS 2 286 #define PTHREADD_UP_BLOCK 3 287 #define PTHREADD_UP_NEW 4 288 #define PTHREADD_UP_PREEMPT 5 289 #define PTHREADD_UP_UNBLOCK 6 290 #define PTHREADD_UP_SIGNAL 7 291 #define PTHREADD_UP_SIGEV 8 292 #define PTHREADD_SPINLOCKS 9 293 #define PTHREADD_SPINUNLOCKS 10 294 #define PTHREADD_SPINPREEMPT 11 295 #define PTHREADD_RESOLVELOCKS 12 296 #define PTHREADD_SWITCHTO 13 297 #define PTHREADD_NCOUNTERS 14 298 299 #ifdef PTHREAD__DEBUG 300 301 #define PTHREAD__DEBUG_SHMKEY (0x000f) 302 #define PTHREAD__DEBUG_SHMSIZE (1<<18) 303 304 extern int pthread__debug_counters[PTHREADD_NCOUNTERS]; 305 306 extern int pthread__dbg; /* Set by libpthread_dbg */ 307 308 #define PTHREADD_ADD(x) (pthread__debug_counters[(x)]++) 309 310 #define DPRINTF(x) pthread__debuglog_printf x 311 312 struct pthread_msgbuf { 313 #define BUF_MAGIC 0x090976 314 int msg_magic; 315 long msg_bufw; 316 long msg_bufr; 317 long msg_bufs; 318 char msg_bufc[1]; 319 }; 320 321 void pthread__debug_init(void); 322 struct pthread_msgbuf* pthread__debuglog_init(int force); 323 void pthread__debuglog_printf(const char *fmt, ...); 324 325 #else /* PTHREAD_DEBUG */ 326 327 #define PTHREADD_ADD(x) 328 #define DPRINTF(x) 329 330 #endif /* PTHREAD_DEBUG */ 331 332 #endif /* _LIB_PTHREAD_INT_H */ 333
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