pthread_int.h revision 1.1.2.25
1 /* $NetBSD: pthread_int.h,v 1.1.2.25 2002/05/20 19:21:19 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 /* The size of this structure needs to be no larger than struct 52 * __pthread_cleanup_store, defined in pthread.h. 53 */ 54 struct pt_clean_t { 55 PTQ_ENTRY(pt_clean_t) ptc_next; 56 void (*ptc_cleanup)(void *); 57 void *ptc_arg; 58 }; 59 60 struct pthread_st { 61 unsigned int pt_magic; 62 63 int pt_type; /* normal, upcall, or idle */ 64 int pt_state; /* running, blocked, etc. */ 65 pthread_spin_t pt_statelock; /* lock on pt_state */ 66 int pt_flags; /* see PT_FLAG_* below */ 67 int pt_cancel; /* Deferred cancellation */ 68 int pt_spinlocks; /* Number of spinlocks held. */ 69 int pt_blockedlwp; /* LWP/SA number when blocked */ 70 71 int pt_errno; /* Thread-specific errno. */ 72 73 /* Entry on the run queue */ 74 PTQ_ENTRY(pthread_st) pt_runq; 75 /* Entry on the list of all threads */ 76 PTQ_ENTRY(pthread_st) pt_allq; 77 /* Entry on the sleep queue (xxx should be same as run queue?) */ 78 PTQ_ENTRY(pthread_st) pt_sleep; 79 /* Objecy we're sleeping on */ 80 void *pt_sleepobj; 81 /* Queue we're sleeping on */ 82 struct pthread_queue_t *pt_sleepq; 83 /* Lock protecting that queue */ 84 pthread_spin_t *pt_sleeplock; 85 86 stack_t pt_stack; /* Our stack */ 87 ucontext_t *pt_uc; /* Saved context when we're stopped */ 88 89 sigset_t pt_sigmask; /* Signals we won't take. */ 90 sigset_t pt_siglist; /* Signals pending for us. */ 91 pthread_spin_t pt_siglock; /* Lock on above */ 92 93 void * pt_exitval; /* Read by pthread_join() */ 94 95 /* Stack of cancellation cleanup handlers and their arguments */ 96 PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; 97 98 /* Other threads trying to pthread_join() us. */ 99 struct pthread_queue_t pt_joiners; 100 /* Lock for above, and for changing pt_state to ZOMBIE or DEAD, 101 * and for setting the DETACHED flag 102 */ 103 pthread_spin_t pt_join_lock; 104 105 /* Thread we were going to switch to before we were preempted 106 * ourselves. Will be used by the upcall that's continuing us. 107 */ 108 pthread_t pt_switchto; 109 ucontext_t* pt_switchtouc; 110 111 /* The context we saved in pthread__locked_switch but which 112 * was trashed when we were preempted before switching stacks. 113 */ 114 ucontext_t* pt_sleepuc; 115 116 /* Threads that are preempted with spinlocks held will be 117 * continued until they unlock their spinlock. When they do 118 * so, they should jump ship to the thread pointed to by 119 * pt_next. 120 */ 121 pthread_t pt_next; 122 123 /* The upcall that is continuing this thread */ 124 pthread_t pt_parent; 125 126 /* A queue lock that this thread held while trying to 127 * context switch to another process. 128 */ 129 pthread_spin_t* pt_heldlock; 130 131 /* Identifier, for debugging. */ 132 int pt_num; 133 134 /* Thread-specific data */ 135 void* pt_specific[PTHREAD_KEYS_MAX]; 136 137 #ifdef PTHREAD__DEBUG 138 int blocks; 139 int preempts; 140 int rescheds; 141 #endif 142 }; 143 144 145 146 /* Thread types */ 147 #define PT_THREAD_NORMAL 1 148 #define PT_THREAD_UPCALL 2 149 #define PT_THREAD_IDLE 3 150 151 /* Thread states */ 152 #define PT_STATE_RUNNING 1 153 #define PT_STATE_RUNNABLE 2 154 #define PT_STATE_BLOCKED_SYS 3 155 #define PT_STATE_BLOCKED_QUEUE 4 156 #define PT_STATE_ZOMBIE 5 157 #define PT_STATE_DEAD 6 158 #define PT_STATE_RECYCLABLE 7 159 160 /* Flag values */ 161 162 #define PT_FLAG_DETACHED 0x0001 163 #define PT_FLAG_IDLED 0x0002 164 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ 165 #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ 166 #define PT_FLAG_CS_PENDING 0x0010 167 168 #define PT_MAGIC 0x11110001 169 #define PT_DEAD 0xDEAD0001 170 171 #define PT_ATTR_MAGIC 0x22220002 172 #define PT_ATTR_DEAD 0xDEAD0002 173 174 #define PT_STACKSIZE (1<<18) 175 #define PT_STACKMASK (PT_STACKSIZE-1) 176 177 #define PT_UPCALLSTACKS 16 178 179 #define PT_ALARMTIMER_MAGIC 0x88880008 180 #define NIDLETHREADS 4 181 #define IDLESPINS 1000 182 183 /* Flag to be used in a ucontext_t's uc_flags indicating that 184 * the saved register state is "user" state only, not full 185 * trap state. 186 */ 187 #define _UC_USER_BIT 30 188 #define _UC_USER (1LU << _UC_USER_BIT) 189 190 void pthread_init(void) __attribute__ ((__constructor__)); 191 192 /* Utility functions */ 193 194 /* Set up/clean up a thread's basic state. */ 195 void pthread__initthread(pthread_t self, pthread_t t); 196 197 /* Go do something else. Don't go back on the run queue */ 198 void pthread__block(pthread_t self, pthread_spin_t* queuelock); 199 /* Put a thread back on the run queue */ 200 void pthread__sched(pthread_t self, pthread_t thread); 201 void pthread__sched_idle(pthread_t self, pthread_t thread); 202 void pthread__sched_idle2(pthread_t self); 203 204 void pthread__sched_bulk(pthread_t self, pthread_t qhead); 205 206 void pthread__idle(void); 207 208 /* Get the next thread */ 209 pthread_t pthread__next(pthread_t self); 210 211 int pthread__stackalloc(pthread_t *t); 212 void pthread__initmain(pthread_t *t); 213 214 void pthread__sa_start(void); 215 void pthread__sa_recycle(pthread_t old, pthread_t new); 216 217 /* Alarm code */ 218 void pthread__alarm_init(void); 219 void *pthread__alarm_add(pthread_t, const struct timespec *, 220 void (*)(void *), void *); 221 void pthread__alarm_del(pthread_t, void *); 222 int pthread__alarm_fired(void *); 223 void pthread__alarm_process(pthread_t self, void *arg); 224 225 /* Internal locking primitives */ 226 void pthread_lockinit(pthread_spin_t *lock); 227 void pthread_spinlock(pthread_t thread, pthread_spin_t *lock); 228 int pthread_spintrylock(pthread_t thread, pthread_spin_t *lock); 229 void pthread_spinunlock(pthread_t thread, pthread_spin_t *lock); 230 231 #include "pthread_md.h" 232 233 int _getcontext_u(ucontext_t *); 234 int _setcontext_u(const ucontext_t *); 235 int _swapcontext_u(ucontext_t *, const ucontext_t *); 236 237 void pthread__testcancel(pthread_t self); 238 239 /* Stack location of pointer to a particular thread */ 240 #define pthread__id(sp) \ 241 ((pthread_t) (((vaddr_t)(sp)) & ~PT_STACKMASK)) 242 243 #define pthread__self() (pthread__id(pthread__sp())) 244 245 /* These three routines are defined in processor-specific code. */ 246 void pthread__upcall_switch(pthread_t self, pthread_t next); 247 void pthread__switch(pthread_t self, pthread_t next); 248 void pthread__locked_switch(pthread_t self, pthread_t next, 249 pthread_spin_t *lock); 250 251 void pthread__signal_init(void); 252 253 void pthread__signal(pthread_t t, int sig, int code); 254 255 void pthread__destroy_tsd(pthread_t self); 256 257 258 #define PTHREADD_CREATE 0 259 #define PTHREADD_IDLE 1 260 #define PTHREADD_UPCALLS 2 261 #define PTHREADD_UP_BLOCK 3 262 #define PTHREADD_UP_NEW 4 263 #define PTHREADD_UP_PREEMPT 5 264 #define PTHREADD_UP_UNBLOCK 6 265 #define PTHREADD_UP_SIGNAL 7 266 #define PTHREADD_SPINLOCKS 8 267 #define PTHREADD_SPINUNLOCKS 9 268 #define PTHREADD_SPINPREEMPT 10 269 #define PTHREADD_RESOLVELOCKS 11 270 #define PTHREADD_SWITCHTO 12 271 #define PTHREADD_NCOUNTERS 13 272 273 #ifdef PTHREAD__DEBUG 274 275 #define PTHREAD__DEBUG_SHMKEY (0x000f) 276 #define PTHREAD__DEBUG_SHMSIZE (1<<18) 277 278 extern int pthread__debug_counters[PTHREADD_NCOUNTERS]; 279 280 extern int pthread__dbg; /* Set by libpthread_dbg */ 281 282 #define PTHREADD_ADD(x) (pthread__debug_counters[(x)]++) 283 284 #define DPRINTF(x) pthread__debuglog_printf x 285 286 struct pthread_msgbuf { 287 #define BUF_MAGIC 0x090976 288 int msg_magic; 289 long msg_bufw; 290 long msg_bufr; 291 long msg_bufs; 292 char msg_bufc[1]; 293 }; 294 295 void pthread__debug_init(void); 296 struct pthread_msgbuf* pthread__debuglog_init(int force); 297 void pthread__debuglog_printf(const char *fmt, ...); 298 299 #else /* PTHREAD_DEBUG */ 300 301 #define PTHREADD_ADD(x) 302 #define DPRINTF(x) 303 304 #endif /* PTHREAD_DEBUG */ 305 306 #endif /* _LIB_PTHREAD_INT_H */ 307 308
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