thr_init.c revision 48609
116Salm/* 2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by John Birrell. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $Id: uthread_init.c,v 1.13 1999/07/05 00:35:19 jasone Exp $ 33 */ 34 35/* Allocate space for global thread variables here: */ 36#define GLOBAL_PTHREAD_PRIVATE 37 38#include <errno.h> 39#include <stdlib.h> 40#include <string.h> 41#include <fcntl.h> 42#include <paths.h> 43#include <poll.h> 44#include <unistd.h> 45#include <sys/sysctl.h> 46#include <sys/time.h> 47#include <sys/ttycom.h> 48#include <sys/types.h> 49#include <sys/mman.h> 50#ifdef _THREAD_SAFE 51#include <machine/reg.h> 52#include <pthread.h> 53#include "pthread_private.h" 54 55#ifdef GCC_2_8_MADE_THREAD_AWARE 56typedef void *** (*dynamic_handler_allocator)(); 57extern void __set_dynamic_handler_allocator(dynamic_handler_allocator); 58 59static pthread_key_t except_head_key; 60 61typedef struct { 62 void **__dynamic_handler_chain; 63 void *top_elt[2]; 64} except_struct; 65 66static void ***dynamic_allocator_handler_fn() 67{ 68 except_struct *dh = (except_struct *)pthread_getspecific(except_head_key); 69 70 if(dh == NULL) { 71 dh = (except_struct *)malloc( sizeof(except_struct) ); 72 memset(dh, '\0', sizeof(except_struct)); 73 dh->__dynamic_handler_chain= dh->top_elt; 74 pthread_setspecific(except_head_key, (void *)dh); 75 } 76 return &dh->__dynamic_handler_chain; 77} 78#endif /* GCC_2_8_MADE_THREAD_AWARE */ 79 80/* 81 * Threaded process initialization 82 */ 83void 84_thread_init(void) 85{ 86 int fd; 87 int flags; 88 int i; 89 size_t len; 90 int mib[2]; 91 struct clockinfo clockinfo; 92 struct sigaction act; 93 94 /* Check if this function has already been called: */ 95 if (_thread_initial) 96 /* Only initialise the threaded application once. */ 97 return; 98 99 /* 100 * Check for the special case of this process running as 101 * or in place of init as pid = 1: 102 */ 103 if (getpid() == 1) { 104 /* 105 * Setup a new session for this process which is 106 * assumed to be running as root. 107 */ 108 if (setsid() == -1) 109 PANIC("Can't set session ID"); 110 if (revoke(_PATH_CONSOLE) != 0) 111 PANIC("Can't revoke console"); 112 if ((fd = _thread_sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 113 PANIC("Can't open console"); 114 if (setlogin("root") == -1) 115 PANIC("Can't set login to root"); 116 if (_thread_sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1) 117 PANIC("Can't set controlling terminal"); 118 if (_thread_sys_dup2(fd,0) == -1 || 119 _thread_sys_dup2(fd,1) == -1 || 120 _thread_sys_dup2(fd,2) == -1) 121 PANIC("Can't dup2"); 122 } 123 124 /* Get the standard I/O flags before messing with them : */ 125 for (i = 0; i < 3; i++) 126 if ((_pthread_stdio_flags[i] = 127 _thread_sys_fcntl(i,F_GETFL, NULL)) == -1) 128 PANIC("Cannot get stdio flags"); 129 130 /* 131 * Create a pipe that is written to by the signal handler to prevent 132 * signals being missed in calls to _select: 133 */ 134 if (_thread_sys_pipe(_thread_kern_pipe) != 0) { 135 /* Cannot create pipe, so abort: */ 136 PANIC("Cannot create kernel pipe"); 137 } 138 /* Get the flags for the read pipe: */ 139 else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) { 140 /* Abort this application: */ 141 PANIC("Cannot get kernel read pipe flags"); 142 } 143 /* Make the read pipe non-blocking: */ 144 else if (_thread_sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) { 145 /* Abort this application: */ 146 PANIC("Cannot make kernel read pipe non-blocking"); 147 } 148 /* Get the flags for the write pipe: */ 149 else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) { 150 /* Abort this application: */ 151 PANIC("Cannot get kernel write pipe flags"); 152 } 153 /* Make the write pipe non-blocking: */ 154 else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) { 155 /* Abort this application: */ 156 PANIC("Cannot get kernel write pipe flags"); 157 } 158 /* Allocate and initialize the ready queue: */ 159 else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_MAX_PRIORITY) != 0) { 160 /* Abort this application: */ 161 PANIC("Cannot allocate priority ready queue."); 162 } 163 /* Allocate memory for the thread structure of the initial thread: */ 164 else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) { 165 /* 166 * Insufficient memory to initialise this application, so 167 * abort: 168 */ 169 PANIC("Cannot allocate memory for initial thread"); 170 } else { 171 /* Zero the global kernel thread structure: */ 172 memset(&_thread_kern_thread, 0, sizeof(struct pthread)); 173 _thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE; 174 memset(_thread_initial, 0, sizeof(struct pthread)); 175 176 /* Initialize the waiting and work queues: */ 177 TAILQ_INIT(&_waitingq); 178 TAILQ_INIT(&_workq); 179 180 /* Initialize the scheduling switch hook routine: */ 181 _sched_switch_hook = NULL; 182 183#ifdef __i386__ 184 /* Initialize the thread stack cache: */ 185 SLIST_INIT(&_stackq); 186 187 /* Create the red zone for the main stack. */ 188 if (MAP_FAILED == mmap((void *) PTHREAD_STACK_TOP - PTHREAD_STACK_INITIAL, PTHREAD_STACK_GUARD, 0, MAP_ANON, -1, 0)) { 189 PANIC("Cannot allocate red zone for initial thread"); 190 } 191#endif 192 /* 193 * Write a magic value to the thread structure 194 * to help identify valid ones: 195 */ 196 _thread_initial->magic = PTHREAD_MAGIC; 197 198 /* Default the priority of the initial thread: */ 199 _thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY; 200 _thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY; 201 _thread_initial->inherited_priority = 0; 202 203 /* Initialise the state of the initial thread: */ 204 _thread_initial->state = PS_RUNNING; 205 206 /* Initialise the queue: */ 207 TAILQ_INIT(&(_thread_initial->join_queue)); 208 209 /* Initialize the owned mutex queue and count: */ 210 TAILQ_INIT(&(_thread_initial->mutexq)); 211 _thread_initial->priority_mutex_count = 0; 212 213 /* Initialise the rest of the fields: */ 214 _thread_initial->poll_data.nfds = 0; 215 _thread_initial->poll_data.fds = NULL; 216 _thread_initial->sig_defer_count = 0; 217 _thread_initial->yield_on_sig_undefer = 0; 218 _thread_initial->specific_data = NULL; 219 _thread_initial->cleanup = NULL; 220 _thread_initial->flags = 0; 221 _thread_initial->error = 0; 222 TAILQ_INIT(&_thread_list); 223 TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle); 224 _thread_run = _thread_initial; 225 226 /* Initialise the global signal action structure: */ 227 sigfillset(&act.sa_mask); 228 act.sa_handler = (void (*) ()) _thread_sig_handler; 229 act.sa_flags = 0; 230 231 /* Initialize signal handling: */ 232 _thread_sig_init(); 233 234 /* Enter a loop to get the existing signal status: */ 235 for (i = 1; i < NSIG; i++) { 236 /* Check for signals which cannot be trapped: */ 237 if (i == SIGKILL || i == SIGSTOP) { 238 } 239 240 /* Get the signal handler details: */ 241 else if (_thread_sys_sigaction(i, NULL, 242 &_thread_sigact[i - 1]) != 0) { 243 /* 244 * Abort this process if signal 245 * initialisation fails: 246 */ 247 PANIC("Cannot read signal handler info"); 248 } 249 } 250 251 /* 252 * Install the signal handler for the most important 253 * signals that the user-thread kernel needs. Actually 254 * SIGINFO isn't really needed, but it is nice to have. 255 */ 256 if (_thread_sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 || 257 _thread_sys_sigaction(SIGINFO, &act, NULL) != 0 || 258 _thread_sys_sigaction(SIGCHLD, &act, NULL) != 0) { 259 /* 260 * Abort this process if signal initialisation fails: 261 */ 262 PANIC("Cannot initialise signal handler"); 263 } 264 265 /* Get the kernel clockrate: */ 266 mib[0] = CTL_KERN; 267 mib[1] = KERN_CLOCKRATE; 268 len = sizeof (struct clockinfo); 269 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0) 270 _clock_res_nsec = clockinfo.tick * 1000; 271 272 /* Get the table size: */ 273 if ((_thread_dtablesize = getdtablesize()) < 0) { 274 /* 275 * Cannot get the system defined table size, so abort 276 * this process. 277 */ 278 PANIC("Cannot get dtablesize"); 279 } 280 /* Allocate memory for the file descriptor table: */ 281 if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) { 282 /* 283 * Cannot allocate memory for the file descriptor 284 * table, so abort this process. 285 */ 286 PANIC("Cannot allocate memory for file descriptor table"); 287 } 288 /* Allocate memory for the pollfd table: */ 289 if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) { 290 /* 291 * Cannot allocate memory for the file descriptor 292 * table, so abort this process. 293 */ 294 PANIC("Cannot allocate memory for pollfd table"); 295 } else { 296 /* 297 * Enter a loop to initialise the file descriptor 298 * table: 299 */ 300 for (i = 0; i < _thread_dtablesize; i++) { 301 /* Initialise the file descriptor table: */ 302 _thread_fd_table[i] = NULL; 303 } 304 305 /* Initialize stdio file descriptor table entries: */ 306 if ((_thread_fd_table_init(0) != 0) || 307 (_thread_fd_table_init(1) != 0) || 308 (_thread_fd_table_init(2) != 0)) { 309 PANIC("Cannot initialize stdio file descriptor " 310 "table entries"); 311 } 312 } 313 } 314 315#ifdef GCC_2_8_MADE_THREAD_AWARE 316 /* Create the thread-specific data for the exception linked list. */ 317 if(pthread_key_create(&except_head_key, NULL) != 0) 318 PANIC("Failed to create thread specific execption head"); 319 320 /* Setup the gcc exception handler per thread. */ 321 __set_dynamic_handler_allocator( dynamic_allocator_handler_fn ); 322#endif /* GCC_2_8_MADE_THREAD_AWARE */ 323 324 /* Initialise the garbage collector mutex and condition variable. */ 325 if (pthread_mutex_init(&_gc_mutex,NULL) != 0 || 326 pthread_cond_init(&_gc_cond,NULL) != 0) 327 PANIC("Failed to initialise garbage collector mutex or condvar"); 328 329 gettimeofday(&kern_inc_prio_time, NULL); 330 331 return; 332} 333 334/* 335 * Special start up code for NetBSD/Alpha 336 */ 337#if defined(__NetBSD__) && defined(__alpha__) 338int 339main(int argc, char *argv[], char *env); 340 341int 342_thread_main(int argc, char *argv[], char *env) 343{ 344 _thread_init(); 345 return (main(argc, argv, env)); 346} 347#endif 348#else 349/* 350 * A stub for non-threaded programs. 351 */ 352void 353_thread_init(void) 354{ 355} 356#endif 357