pthread_int.h revision 1.1.2.28
1 /* $NetBSD: pthread_int.h,v 1.1.2.28 2002/08/12 22:39:52 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 pt_alarm_t { 61 PTQ_ENTRY(pt_alarm_t) pta_next; 62 const struct timespec *pta_time; 63 void (*pta_func)(void *); 64 void *pta_arg; 65 int pta_fired; 66 }; 67 68 struct pthread_st { 69 unsigned int pt_magic; 70 71 int pt_type; /* normal, upcall, or idle */ 72 int pt_state; /* running, blocked, etc. */ 73 pthread_spin_t pt_statelock; /* lock on pt_state */ 74 int pt_flags; /* see PT_FLAG_* below */ 75 int pt_cancel; /* Deferred cancellation */ 76 int pt_spinlocks; /* Number of spinlocks held. */ 77 int pt_blockedlwp; /* LWP/SA number when blocked */ 78 79 int pt_errno; /* Thread-specific errno. */ 80 81 /* Entry on the run queue */ 82 PTQ_ENTRY(pthread_st) pt_runq; 83 /* Entry on the list of all threads */ 84 PTQ_ENTRY(pthread_st) pt_allq; 85 /* Entry on the sleep queue (xxx should be same as run queue?) */ 86 PTQ_ENTRY(pthread_st) pt_sleep; 87 /* Objecy we're sleeping on */ 88 void *pt_sleepobj; 89 /* Queue we're sleeping on */ 90 struct pthread_queue_t *pt_sleepq; 91 /* Lock protecting that queue */ 92 pthread_spin_t *pt_sleeplock; 93 94 stack_t pt_stack; /* Our stack */ 95 ucontext_t *pt_uc; /* Saved context when we're stopped */ 96 97 sigset_t pt_sigmask; /* Signals we won't take. */ 98 sigset_t pt_siglist; /* Signals pending for us. */ 99 pthread_spin_t pt_siglock; /* Lock on above */ 100 101 void * pt_exitval; /* Read by pthread_join() */ 102 103 /* Stack of cancellation cleanup handlers and their arguments */ 104 PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; 105 106 /* Other threads trying to pthread_join() us. */ 107 struct pthread_queue_t pt_joiners; 108 /* Lock for above, and for changing pt_state to ZOMBIE or DEAD, 109 * and for setting the DETACHED flag 110 */ 111 pthread_spin_t pt_join_lock; 112 113 /* Thread we were going to switch to before we were preempted 114 * ourselves. Will be used by the upcall that's continuing us. 115 */ 116 pthread_t pt_switchto; 117 ucontext_t* pt_switchtouc; 118 119 /* The context we saved in pthread__locked_switch but which 120 * was trashed when we were preempted before switching stacks. 121 */ 122 ucontext_t* pt_sleepuc; 123 124 /* Threads that are preempted with spinlocks held will be 125 * continued until they unlock their spinlock. When they do 126 * so, they should jump ship to the thread pointed to by 127 * pt_next. 128 */ 129 pthread_t pt_next; 130 131 /* The upcall that is continuing this thread */ 132 pthread_t pt_parent; 133 134 /* A queue lock that this thread held while trying to 135 * context switch to another process. 136 */ 137 pthread_spin_t* pt_heldlock; 138 139 /* Identifier, for debugging. */ 140 int pt_num; 141 142 /* Thread-specific data */ 143 void* pt_specific[PTHREAD_KEYS_MAX]; 144 145 #ifdef PTHREAD__DEBUG 146 int blocks; 147 int preempts; 148 int rescheds; 149 #endif 150 }; 151 152 153 154 /* Thread types */ 155 #define PT_THREAD_NORMAL 1 156 #define PT_THREAD_UPCALL 2 157 #define PT_THREAD_IDLE 3 158 159 /* Thread states */ 160 #define PT_STATE_RUNNING 1 161 #define PT_STATE_RUNNABLE 2 162 #define PT_STATE_BLOCKED_SYS 3 163 #define PT_STATE_BLOCKED_QUEUE 4 164 #define PT_STATE_ZOMBIE 5 165 #define PT_STATE_DEAD 6 166 #define PT_STATE_RECYCLABLE 7 167 168 /* Flag values */ 169 170 #define PT_FLAG_DETACHED 0x0001 171 #define PT_FLAG_IDLED 0x0002 172 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ 173 #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ 174 #define PT_FLAG_CS_PENDING 0x0010 175 #define PT_FLAG_SIGCATCH 0x0020 /* Interrupt sleep on a signal */ 176 177 #define PT_MAGIC 0x11110001 178 #define PT_DEAD 0xDEAD0001 179 180 #define PT_ATTR_MAGIC 0x22220002 181 #define PT_ATTR_DEAD 0xDEAD0002 182 183 #define PT_STACKSIZE (1<<18) 184 #define PT_STACKMASK (PT_STACKSIZE-1) 185 186 #define PT_UPCALLSTACKS 16 187 188 #define PT_ALARMTIMER_MAGIC 0x88880008 189 #define NIDLETHREADS 4 190 #define IDLESPINS 1000 191 192 /* Flag to be used in a ucontext_t's uc_flags indicating that 193 * the saved register state is "user" state only, not full 194 * trap state. 195 */ 196 #define _UC_USER_BIT 30 197 #define _UC_USER (1LU << _UC_USER_BIT) 198 199 void pthread_init(void) __attribute__ ((__constructor__)); 200 201 /* Utility functions */ 202 203 /* Set up/clean up a thread's basic state. */ 204 void pthread__initthread(pthread_t self, pthread_t t); 205 206 /* Go do something else. Don't go back on the run queue */ 207 void pthread__block(pthread_t self, pthread_spin_t* queuelock); 208 /* Put a thread back on the run queue */ 209 void pthread__sched(pthread_t self, pthread_t thread); 210 void pthread__sched_idle(pthread_t self, pthread_t thread); 211 void pthread__sched_idle2(pthread_t self); 212 213 void pthread__sched_bulk(pthread_t self, pthread_t qhead); 214 215 void pthread__idle(void); 216 217 /* Get the next thread */ 218 pthread_t pthread__next(pthread_t self); 219 220 int pthread__stackalloc(pthread_t *t); 221 void pthread__initmain(pthread_t *t); 222 223 void pthread__sa_start(void); 224 void pthread__sa_recycle(pthread_t old, pthread_t new); 225 226 /* Alarm code */ 227 void pthread__alarm_init(void); 228 void pthread__alarm_add(pthread_t, struct pt_alarm_t *, 229 const struct timespec *, void (*)(void *), void *); 230 void pthread__alarm_del(pthread_t, struct pt_alarm_t *); 231 int pthread__alarm_fired(void *); 232 void pthread__alarm_process(pthread_t self, void *arg); 233 234 /* Internal locking primitives */ 235 void pthread_lockinit(pthread_spin_t *lock); 236 void pthread_spinlock(pthread_t thread, pthread_spin_t *lock); 237 int pthread_spintrylock(pthread_t thread, pthread_spin_t *lock); 238 void pthread_spinunlock(pthread_t thread, pthread_spin_t *lock); 239 240 int _getcontext_u(ucontext_t *); 241 int _setcontext_u(const ucontext_t *); 242 int _swapcontext_u(ucontext_t *, const ucontext_t *); 243 244 void pthread__testcancel(pthread_t self); 245 246 #include "pthread_md.h" 247 248 /* Stack location of pointer to a particular thread */ 249 #define pthread__id(sp) \ 250 ((pthread_t) (((vaddr_t)(sp)) & ~PT_STACKMASK)) 251 252 #define pthread__self() (pthread__id(pthread__sp())) 253 254 /* These three routines are defined in processor-specific code. */ 255 void pthread__upcall_switch(pthread_t self, pthread_t next); 256 void pthread__switch(pthread_t self, pthread_t next); 257 void pthread__locked_switch(pthread_t self, pthread_t next, 258 pthread_spin_t *lock); 259 260 void pthread__signal_init(void); 261 262 void pthread__signal(pthread_t t, int sig, int code); 263 264 void pthread__destroy_tsd(pthread_t self); 265 266 267 #define PTHREADD_CREATE 0 268 #define PTHREADD_IDLE 1 269 #define PTHREADD_UPCALLS 2 270 #define PTHREADD_UP_BLOCK 3 271 #define PTHREADD_UP_NEW 4 272 #define PTHREADD_UP_PREEMPT 5 273 #define PTHREADD_UP_UNBLOCK 6 274 #define PTHREADD_UP_SIGNAL 7 275 #define PTHREADD_SPINLOCKS 8 276 #define PTHREADD_SPINUNLOCKS 9 277 #define PTHREADD_SPINPREEMPT 10 278 #define PTHREADD_RESOLVELOCKS 11 279 #define PTHREADD_SWITCHTO 12 280 #define PTHREADD_NCOUNTERS 13 281 282 #ifdef PTHREAD__DEBUG 283 284 #define PTHREAD__DEBUG_SHMKEY (0x000f) 285 #define PTHREAD__DEBUG_SHMSIZE (1<<18) 286 287 extern int pthread__debug_counters[PTHREADD_NCOUNTERS]; 288 289 extern int pthread__dbg; /* Set by libpthread_dbg */ 290 291 #define PTHREADD_ADD(x) (pthread__debug_counters[(x)]++) 292 293 #define DPRINTF(x) pthread__debuglog_printf x 294 295 struct pthread_msgbuf { 296 #define BUF_MAGIC 0x090976 297 int msg_magic; 298 long msg_bufw; 299 long msg_bufr; 300 long msg_bufs; 301 char msg_bufc[1]; 302 }; 303 304 void pthread__debug_init(void); 305 struct pthread_msgbuf* pthread__debuglog_init(int force); 306 void pthread__debuglog_printf(const char *fmt, ...); 307 308 #else /* PTHREAD_DEBUG */ 309 310 #define PTHREADD_ADD(x) 311 #define DPRINTF(x) 312 313 #endif /* PTHREAD_DEBUG */ 314 315 #endif /* _LIB_PTHREAD_INT_H */ 316 317
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