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 * $FreeBSD$ 33 */ 34 35 /* Allocate space for global thread variables here: */ 36 #define GLOBAL_PTHREAD_PRIVATE 37 38 #include "namespace.h" 39 #include <sys/param.h> 40 #include <sys/types.h> 41 #include <machine/reg.h> 42 43 #include <sys/ioctl.h> 44 #include <sys/mount.h> 45 #include <sys/uio.h> 46 #include <sys/socket.h> 47 #include <sys/event.h> 48 #include <sys/stat.h> 49 #include <sys/sysctl.h> 50 #include <sys/time.h> 51 #include <sys/ttycom.h> 52 #include <sys/user.h> 53 #include <sys/wait.h> 54 #include <sys/mman.h> 55 #include <dirent.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <paths.h> 59 #include <pthread.h> 60 #include <signal.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 #include "un-namespace.h" 66 67 #include "thr_private.h" 68 69 /* 70 * Early implementations of sigtimedwait interpreted the signal 71 * set incorrectly. 72 */ 73 #define SIGTIMEDWAIT_SET_IS_INVERTED(osreldate) \ 74 ((500100 <= (osreldate) && (osreldate) <= 500113) || \ 75 (osreldate) == 501000 || (osreldate) == 501100) 76 77 extern void _thread_init_hack(void); 78 79 /* 80 * All weak references used within libc should be in this table. 81 * This will is so that static libraries will work. 82 * 83 * XXXTHR - Check this list. 84 */ 85 static void *references[] = { 86 &_thread_init_hack, 87 &_thread_init, 88 &_accept, 89 &_bind, 90 &_close, 91 &_connect, 92 &_dup, 93 &_dup2, 94 &_execve, 95 &_fcntl, 96 &_flock, 97 &_flockfile, 98 &_fstat, 99 &_fstatfs, 100 &_fsync, 101 &_funlockfile, 102 &_getdirentries, 103 &_getlogin, 104 &_getpeername, 105 &_getsockname, 106 &_getsockopt, 107 &_ioctl, 108 &_kevent, 109 &_listen, 110 &_nanosleep, 111 &_open, 112 &_pthread_getspecific, 113 &_pthread_key_create, 114 &_pthread_key_delete, 115 &_pthread_mutex_destroy, 116 &_pthread_mutex_init, 117 &_pthread_mutex_lock, 118 &_pthread_mutex_trylock, 119 &_pthread_mutex_unlock, 120 &_pthread_mutexattr_init, 121 &_pthread_mutexattr_destroy, 122 &_pthread_mutexattr_settype, 123 &_pthread_once, 124 &_pthread_setspecific, 125 &_read, 126 &_readv, 127 &_recvfrom, 128 &_recvmsg, 129 &_select, 130 &_sendmsg, 131 &_sendto, 132 &_setsockopt, 133 &_sigaction, 134 &_sigprocmask, 135 &_sigsuspend, 136 &_socket, 137 &_socketpair, 138 &_wait4, 139 &_write, 140 &_writev 141 }; 142 143 /* 144 * These are needed when linking statically. All references within 145 * libgcc (and in the future libc) to these routines are weak, but 146 * if they are not (strongly) referenced by the application or other 147 * libraries, then the actual functions will not be loaded. 148 */ 149 static void *libgcc_references[] = { 150 &_thread_init_hack, 151 &_thread_init, 152 &_pthread_once, 153 &_pthread_key_create, 154 &_pthread_key_delete, 155 &_pthread_getspecific, 156 &_pthread_setspecific, 157 &_pthread_mutex_init, 158 &_pthread_mutex_destroy, 159 &_pthread_mutex_lock, 160 &_pthread_mutex_trylock, 161 &_pthread_mutex_unlock 162 }; 163 164 int _pthread_guard_default; 165 int _pthread_page_size; 166 167 /* 168 * Threaded process initialization 169 */ 170 void 171 _thread_init(void) 172 { 173 struct pthread *pthread; 174 int fd; 175 int i; 176 size_t len; 177 int mib[2]; 178 sigset_t set; 179 int osreldate; 180 int error; 181 182 struct clockinfo clockinfo; 183 struct sigaction act; 184 185 /* Check if this function has already been called: */ 186 if (_thread_initial) 187 /* Only initialise the threaded application once. */ 188 return; 189 190 _pthread_page_size = getpagesize(); 191 _pthread_guard_default = getpagesize(); 192 193 pthread_attr_default.guardsize_attr = _pthread_guard_default; 194 195 196 /* 197 * Make gcc quiescent about {,libgcc_}references not being 198 * referenced: 199 */ 200 if ((references[0] == NULL) || (libgcc_references[0] == NULL)) 201 PANIC("Failed loading mandatory references in _thread_init"); 202 203 /* 204 * Check for the special case of this process running as 205 * or in place of init as pid = 1: 206 */ 207 if (getpid() == 1) { 208 /* 209 * Setup a new session for this process which is 210 * assumed to be running as root. 211 */ 212 if (setsid() == -1) 213 PANIC("Can't set session ID"); 214 if (revoke(_PATH_CONSOLE) != 0) 215 PANIC("Can't revoke console"); 216 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 217 PANIC("Can't open console"); 218 if (setlogin("root") == -1) 219 PANIC("Can't set login to root"); 220 if (__sys_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1) 221 PANIC("Can't set controlling terminal"); 222 if (__sys_dup2(fd, 0) == -1 || 223 __sys_dup2(fd, 1) == -1 || 224 __sys_dup2(fd, 2) == -1) 225 PANIC("Can't dup2"); 226 } 227 228 /* Allocate memory for the thread structure of the initial thread: */ 229 if ((pthread = (pthread_t) malloc(sizeof(struct pthread))) == NULL) { 230 /* 231 * Insufficient memory to initialise this application, so 232 * abort: 233 */ 234 PANIC("Cannot allocate memory for initial thread"); 235 } 236 /* Zero the initial thread structure: */ 237 memset(pthread, 0, sizeof(struct pthread)); 238 239 _thread_initial = pthread; 240 pthread->arch_id = _set_curthread(NULL, pthread, &error); 241 242 /* Get our thread id. */ 243 thr_self(&pthread->thr_id); 244 245 /* Give this thread default attributes: */ 246 memcpy((void *) &pthread->attr, &pthread_attr_default, 247 sizeof(struct pthread_attr)); 248 249 /* Find the stack top */ 250 mib[0] = CTL_KERN; 251 mib[1] = KERN_USRSTACK; 252 len = sizeof (_usrstack); 253 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1) 254 _usrstack = (void *)USRSTACK; 255 /* 256 * Create a red zone below the main stack. All other stacks are 257 * constrained to a maximum size by the paramters passed to 258 * mmap(), but this stack is only limited by resource limits, so 259 * this stack needs an explicitly mapped red zone to protect the 260 * thread stack that is just beyond. 261 */ 262 if (mmap(_usrstack - PTHREAD_STACK_INITIAL - 263 _pthread_guard_default, _pthread_guard_default, 0, 264 MAP_ANON, -1, 0) == MAP_FAILED) 265 PANIC("Cannot allocate red zone for initial thread"); 266 267 /* Set the main thread stack pointer. */ 268 pthread->stack = _usrstack - PTHREAD_STACK_INITIAL; 269 270 /* Set the stack attributes. */ 271 pthread->attr.stackaddr_attr = pthread->stack; 272 pthread->attr.stacksize_attr = PTHREAD_STACK_INITIAL; 273 274 /* 275 * Write a magic value to the thread structure 276 * to help identify valid ones: 277 */ 278 pthread->magic = PTHREAD_MAGIC; 279 280 /* Set the initial cancel state */ 281 pthread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED; 282 283 /* Setup the context for initial thread. */ 284 getcontext(&pthread->ctx); 285 pthread->ctx.uc_stack.ss_sp = pthread->stack; 286 pthread->ctx.uc_stack.ss_size = PTHREAD_STACK_INITIAL; 287 288 /* Default the priority of the initial thread: */ 289 pthread->base_priority = PTHREAD_DEFAULT_PRIORITY; 290 pthread->active_priority = PTHREAD_DEFAULT_PRIORITY; 291 pthread->inherited_priority = 0; 292 293 /* Initialise the state of the initial thread: */ 294 pthread->state = PS_RUNNING; 295 296 /* Set the name of the thread: */ 297 pthread->name = strdup("_thread_initial"); 298 299 /* Initialize joiner to NULL (no joiner): */ 300 pthread->joiner = NULL; 301 302 /* Initialize the owned mutex queue and count: */ 303 TAILQ_INIT(&(pthread->mutexq)); 304 pthread->priority_mutex_count = 0; 305 306 /* Initialise the rest of the fields: */ 307 pthread->specific = NULL; 308 pthread->cleanup = NULL; 309 pthread->flags = 0; 310 pthread->error = 0; 311 TAILQ_INIT(&_thread_list); 312 TAILQ_INSERT_HEAD(&_thread_list, pthread, tle); 313 314 /* Enter a loop to get the existing signal status: */ 315 for (i = 1; i < NSIG; i++) { 316 /* Check for signals which cannot be trapped. */ 317 if (i == SIGKILL || i == SIGSTOP) 318 continue; 319 320 /* Get the signal handler details. */ 321 if (__sys_sigaction(i, NULL, 322 &_thread_sigact[i - 1]) != 0) 323 PANIC("Cannot read signal handler info"); 324 } 325 act.sa_sigaction = _thread_sig_wrapper; 326 act.sa_flags = SA_SIGINFO; 327 SIGFILLSET(act.sa_mask); 328 329 if (__sys_sigaction(SIGTHR, &act, NULL)) 330 PANIC("Cannot set SIGTHR handler.\n"); 331 332 SIGEMPTYSET(set); 333 SIGADDSET(set, SIGTHR); 334 __sys_sigprocmask(SIG_BLOCK, &set, 0); 335 336 /* 337 * Precompute the signal set used by _thread_suspend to wait 338 * for SIGTHR. 339 */ 340 mib[0] = CTL_KERN; 341 mib[1] = KERN_OSRELDATE; 342 len = sizeof(osreldate); 343 if (sysctl(mib, 2, &osreldate, &len, NULL, 0) == 0 && 344 SIGTIMEDWAIT_SET_IS_INVERTED(osreldate)) { 345 /* Kernel bug requires an inverted signal set. */ 346 SIGFILLSET(_thread_suspend_sigset); 347 SIGDELSET(_thread_suspend_sigset, SIGTHR); 348 } else { 349 SIGEMPTYSET(_thread_suspend_sigset); 350 SIGADDSET(_thread_suspend_sigset, SIGTHR); 351 } 352 #ifdef _PTHREADS_INVARIANTS 353 SIGADDSET(_thread_suspend_sigset, SIGALRM); 354 #endif 355 356 /* Get the kernel clockrate: */ 357 mib[0] = CTL_KERN; 358 mib[1] = KERN_CLOCKRATE; 359 len = sizeof (struct clockinfo); 360 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0) 361 _clock_res_usec = clockinfo.tick > CLOCK_RES_USEC_MIN ? 362 clockinfo.tick : CLOCK_RES_USEC_MIN; 363 364 /* Initialise the garbage collector mutex and condition variable. */ 365 if (_pthread_mutex_init(&dead_list_lock,NULL) != 0 || 366 _pthread_cond_init(&_gc_cond,NULL) != 0) 367 PANIC("Failed to initialise garbage collector mutex or condvar"); 368 } 369 370 /* 371 * Special start up code for NetBSD/Alpha 372 */ 373 #if defined(__NetBSD__) && defined(__alpha__) 374 int 375 main(int argc, char *argv[], char *env); 376 377 int 378 _thread_main(int argc, char *argv[], char *env) 379 { 380 _thread_init(); 381 return (main(argc, argv, env)); 382 } 383 #endif 384