thr_init.c revision 53812
1/* 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 * $FreeBSD: head/lib/libkse/thread/thr_init.c 53812 1999-11-28 05:38:13Z alfred $ 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/ioctl.h> 46#include <sys/sysctl.h> 47#include <sys/time.h> 48#include <sys/ttycom.h> 49#include <sys/param.h> 50#include <sys/user.h> 51#include <sys/mman.h> 52#ifdef _THREAD_SAFE 53#include <machine/reg.h> 54#include <pthread.h> 55#include "pthread_private.h" 56 57#ifdef GCC_2_8_MADE_THREAD_AWARE 58typedef void *** (*dynamic_handler_allocator)(); 59extern void __set_dynamic_handler_allocator(dynamic_handler_allocator); 60 61static pthread_key_t except_head_key; 62 63typedef struct { 64 void **__dynamic_handler_chain; 65 void *top_elt[2]; 66} except_struct; 67 68static void ***dynamic_allocator_handler_fn() 69{ 70 except_struct *dh = (except_struct *)pthread_getspecific(except_head_key); 71 72 if(dh == NULL) { 73 dh = (except_struct *)malloc( sizeof(except_struct) ); 74 memset(dh, '\0', sizeof(except_struct)); 75 dh->__dynamic_handler_chain= dh->top_elt; 76 pthread_setspecific(except_head_key, (void *)dh); 77 } 78 return &dh->__dynamic_handler_chain; 79} 80#endif /* GCC_2_8_MADE_THREAD_AWARE */ 81 82/* 83 * Threaded process initialization 84 */ 85void 86_thread_init(void) 87{ 88 int fd; 89 int flags; 90 int i; 91 size_t len; 92 int mib[2]; 93 struct clockinfo clockinfo; 94 struct sigaction act; 95 96 /* Check if this function has already been called: */ 97 if (_thread_initial) 98 /* Only initialise the threaded application once. */ 99 return; 100 101 /* 102 * Check for the special case of this process running as 103 * or in place of init as pid = 1: 104 */ 105 if (getpid() == 1) { 106 /* 107 * Setup a new session for this process which is 108 * assumed to be running as root. 109 */ 110 if (setsid() == -1) 111 PANIC("Can't set session ID"); 112 if (revoke(_PATH_CONSOLE) != 0) 113 PANIC("Can't revoke console"); 114 if ((fd = _thread_sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 115 PANIC("Can't open console"); 116 if (setlogin("root") == -1) 117 PANIC("Can't set login to root"); 118 if (_thread_sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1) 119 PANIC("Can't set controlling terminal"); 120 if (_thread_sys_dup2(fd,0) == -1 || 121 _thread_sys_dup2(fd,1) == -1 || 122 _thread_sys_dup2(fd,2) == -1) 123 PANIC("Can't dup2"); 124 } 125 126 /* Get the standard I/O flags before messing with them : */ 127 for (i = 0; i < 3; i++) 128 if (((_pthread_stdio_flags[i] = 129 _thread_sys_fcntl(i,F_GETFL, NULL)) == -1) && 130 (errno != EBADF)) 131 PANIC("Cannot get stdio flags"); 132 133 /* 134 * Create a pipe that is written to by the signal handler to prevent 135 * signals being missed in calls to _select: 136 */ 137 if (_thread_sys_pipe(_thread_kern_pipe) != 0) { 138 /* Cannot create pipe, so abort: */ 139 PANIC("Cannot create kernel pipe"); 140 } 141 /* Get the flags for the read pipe: */ 142 else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) { 143 /* Abort this application: */ 144 PANIC("Cannot get kernel read pipe flags"); 145 } 146 /* Make the read pipe non-blocking: */ 147 else if (_thread_sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) { 148 /* Abort this application: */ 149 PANIC("Cannot make kernel read pipe non-blocking"); 150 } 151 /* Get the flags for the write pipe: */ 152 else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) { 153 /* Abort this application: */ 154 PANIC("Cannot get kernel write pipe flags"); 155 } 156 /* Make the write pipe non-blocking: */ 157 else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) { 158 /* Abort this application: */ 159 PANIC("Cannot get kernel write pipe flags"); 160 } 161 /* Allocate and initialize the ready queue: */ 162 else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_MAX_PRIORITY) != 0) { 163 /* Abort this application: */ 164 PANIC("Cannot allocate priority ready queue."); 165 } 166 /* Allocate memory for the thread structure of the initial thread: */ 167 else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) { 168 /* 169 * Insufficient memory to initialise this application, so 170 * abort: 171 */ 172 PANIC("Cannot allocate memory for initial thread"); 173 } else { 174 /* Zero the global kernel thread structure: */ 175 memset(&_thread_kern_thread, 0, sizeof(struct pthread)); 176 _thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE; 177 memset(_thread_initial, 0, sizeof(struct pthread)); 178 179 /* Initialize the waiting and work queues: */ 180 TAILQ_INIT(&_waitingq); 181 TAILQ_INIT(&_workq); 182 183 /* Initialize the scheduling switch hook routine: */ 184 _sched_switch_hook = NULL; 185 186 /* Initialize the thread stack cache: */ 187 SLIST_INIT(&_stackq); 188 189 /* Create the red zone for the main stack. */ 190 if (mmap((void *) USRSTACK 191 - PTHREAD_STACK_INITIAL, 192 PTHREAD_STACK_GUARD, 0, MAP_ANON, 193 -1, 0) == MAP_FAILED) { 194 PANIC("Cannot allocate red zone for initial thread"); 195 } 196 197 /* 198 * Write a magic value to the thread structure 199 * to help identify valid ones: 200 */ 201 _thread_initial->magic = PTHREAD_MAGIC; 202 203 /* Set the initial cancel state */ 204 _thread_initial->cancelflags = PTHREAD_CANCEL_ENABLE | 205 PTHREAD_CANCEL_DEFERRED; 206 207 /* Default the priority of the initial thread: */ 208 _thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY; 209 _thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY; 210 _thread_initial->inherited_priority = 0; 211 212 /* Initialise the state of the initial thread: */ 213 _thread_initial->state = PS_RUNNING; 214 215 /* Initialise the queue: */ 216 TAILQ_INIT(&(_thread_initial->join_queue)); 217 218 /* Initialize the owned mutex queue and count: */ 219 TAILQ_INIT(&(_thread_initial->mutexq)); 220 _thread_initial->priority_mutex_count = 0; 221 222 /* Initialise the rest of the fields: */ 223 _thread_initial->poll_data.nfds = 0; 224 _thread_initial->poll_data.fds = NULL; 225 _thread_initial->sig_defer_count = 0; 226 _thread_initial->yield_on_sig_undefer = 0; 227 _thread_initial->specific_data = NULL; 228 _thread_initial->cleanup = NULL; 229 _thread_initial->flags = 0; 230 _thread_initial->error = 0; 231 TAILQ_INIT(&_thread_list); 232 TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle); 233 _thread_run = _thread_initial; 234 235 /* Initialise the global signal action structure: */ 236 sigfillset(&act.sa_mask); 237 act.sa_handler = (void (*) ()) _thread_sig_handler; 238 act.sa_flags = 0; 239 240 /* Initialize signal handling: */ 241 _thread_sig_init(); 242 243 /* Enter a loop to get the existing signal status: */ 244 for (i = 1; i < NSIG; i++) { 245 /* Check for signals which cannot be trapped: */ 246 if (i == SIGKILL || i == SIGSTOP) { 247 } 248 249 /* Get the signal handler details: */ 250 else if (_thread_sys_sigaction(i, NULL, 251 &_thread_sigact[i - 1]) != 0) { 252 /* 253 * Abort this process if signal 254 * initialisation fails: 255 */ 256 PANIC("Cannot read signal handler info"); 257 } 258 } 259 260 /* 261 * Install the signal handler for the most important 262 * signals that the user-thread kernel needs. Actually 263 * SIGINFO isn't really needed, but it is nice to have. 264 */ 265 if (_thread_sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 || 266 _thread_sys_sigaction(SIGINFO, &act, NULL) != 0 || 267 _thread_sys_sigaction(SIGCHLD, &act, NULL) != 0) { 268 /* 269 * Abort this process if signal initialisation fails: 270 */ 271 PANIC("Cannot initialise signal handler"); 272 } 273 274 /* Get the kernel clockrate: */ 275 mib[0] = CTL_KERN; 276 mib[1] = KERN_CLOCKRATE; 277 len = sizeof (struct clockinfo); 278 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0) 279 _clock_res_nsec = clockinfo.tick * 1000; 280 281 /* Get the table size: */ 282 if ((_thread_dtablesize = getdtablesize()) < 0) { 283 /* 284 * Cannot get the system defined table size, so abort 285 * this process. 286 */ 287 PANIC("Cannot get dtablesize"); 288 } 289 /* Allocate memory for the file descriptor table: */ 290 if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) { 291 /* Avoid accesses to file descriptor table on exit: */ 292 _thread_dtablesize = 0; 293 294 /* 295 * Cannot allocate memory for the file descriptor 296 * table, so abort this process. 297 */ 298 PANIC("Cannot allocate memory for file descriptor table"); 299 } 300 /* Allocate memory for the pollfd table: */ 301 if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) { 302 /* 303 * Cannot allocate memory for the file descriptor 304 * table, so abort this process. 305 */ 306 PANIC("Cannot allocate memory for pollfd table"); 307 } else { 308 /* 309 * Enter a loop to initialise the file descriptor 310 * table: 311 */ 312 for (i = 0; i < _thread_dtablesize; i++) { 313 /* Initialise the file descriptor table: */ 314 _thread_fd_table[i] = NULL; 315 } 316 317 /* Initialize stdio file descriptor table entries: */ 318 for (i = 0; i < 3; i++) { 319 if ((_thread_fd_table_init(i) != 0) && 320 (errno != EBADF)) 321 PANIC("Cannot initialize stdio file " 322 "descriptor table entry"); 323 } 324 } 325 } 326 327#ifdef GCC_2_8_MADE_THREAD_AWARE 328 /* Create the thread-specific data for the exception linked list. */ 329 if(pthread_key_create(&except_head_key, NULL) != 0) 330 PANIC("Failed to create thread specific execption head"); 331 332 /* Setup the gcc exception handler per thread. */ 333 __set_dynamic_handler_allocator( dynamic_allocator_handler_fn ); 334#endif /* GCC_2_8_MADE_THREAD_AWARE */ 335 336 /* Initialise the garbage collector mutex and condition variable. */ 337 if (pthread_mutex_init(&_gc_mutex,NULL) != 0 || 338 pthread_cond_init(&_gc_cond,NULL) != 0) 339 PANIC("Failed to initialise garbage collector mutex or condvar"); 340 341 gettimeofday(&kern_inc_prio_time, NULL); 342 343 return; 344} 345 346/* 347 * Special start up code for NetBSD/Alpha 348 */ 349#if defined(__NetBSD__) && defined(__alpha__) 350int 351main(int argc, char *argv[], char *env); 352 353int 354_thread_main(int argc, char *argv[], char *env) 355{ 356 _thread_init(); 357 return (main(argc, argv, env)); 358} 359#endif 360#else 361/* 362 * A stub for non-threaded programs. 363 */ 364void 365_thread_init(void) 366{ 367} 368#endif 369