thr_init.c revision 48140
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 * $Id: uthread_init.c,v 1.11 1999/06/20 08:28:28 jb 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#ifdef _THREAD_SAFE 49#include <machine/reg.h> 50#include <pthread.h> 51#include "pthread_private.h" 52 53#ifdef GCC_2_8_MADE_THREAD_AWARE 54typedef void *** (*dynamic_handler_allocator)(); 55extern void __set_dynamic_handler_allocator(dynamic_handler_allocator); 56 57static pthread_key_t except_head_key; 58 59typedef struct { 60 void **__dynamic_handler_chain; 61 void *top_elt[2]; 62} except_struct; 63 64static void ***dynamic_allocator_handler_fn() 65{ 66 except_struct *dh = (except_struct *)pthread_getspecific(except_head_key); 67 68 if(dh == NULL) { 69 dh = (except_struct *)malloc( sizeof(except_struct) ); 70 memset(dh, '\0', sizeof(except_struct)); 71 dh->__dynamic_handler_chain= dh->top_elt; 72 pthread_setspecific(except_head_key, (void *)dh); 73 } 74 return &dh->__dynamic_handler_chain; 75} 76#endif /* GCC_2_8_MADE_THREAD_AWARE */ 77 78/* 79 * Threaded process initialization 80 */ 81void 82_thread_init(void) 83{ 84 int fd; 85 int flags; 86 int i; 87 size_t len; 88 int mib[2]; 89 struct clockinfo clockinfo; 90 struct sigaction act; 91 92 /* Check if this function has already been called: */ 93 if (_thread_initial) 94 /* Only initialise the threaded application once. */ 95 return; 96 97 /* 98 * Check for the special case of this process running as 99 * or in place of init as pid = 1: 100 */ 101 if (getpid() == 1) { 102 /* 103 * Setup a new session for this process which is 104 * assumed to be running as root. 105 */ 106 if (setsid() == -1) 107 PANIC("Can't set session ID"); 108 if (revoke(_PATH_CONSOLE) != 0) 109 PANIC("Can't revoke console"); 110 if ((fd = _thread_sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 111 PANIC("Can't open console"); 112 if (setlogin("root") == -1) 113 PANIC("Can't set login to root"); 114 if (_thread_sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1) 115 PANIC("Can't set controlling terminal"); 116 if (_thread_sys_dup2(fd,0) == -1 || 117 _thread_sys_dup2(fd,1) == -1 || 118 _thread_sys_dup2(fd,2) == -1) 119 PANIC("Can't dup2"); 120 } 121 122 /* Get the standard I/O flags before messing with them : */ 123 for (i = 0; i < 3; i++) 124 if ((_pthread_stdio_flags[i] = 125 _thread_sys_fcntl(i,F_GETFL, NULL)) == -1) 126 PANIC("Cannot get stdio flags"); 127 128 /* 129 * Create a pipe that is written to by the signal handler to prevent 130 * signals being missed in calls to _select: 131 */ 132 if (_thread_sys_pipe(_thread_kern_pipe) != 0) { 133 /* Cannot create pipe, so abort: */ 134 PANIC("Cannot create kernel pipe"); 135 } 136 /* Get the flags for the read pipe: */ 137 else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) { 138 /* Abort this application: */ 139 PANIC("Cannot get kernel read pipe flags"); 140 } 141 /* Make the read pipe non-blocking: */ 142 else if (_thread_sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) { 143 /* Abort this application: */ 144 PANIC("Cannot make kernel read pipe non-blocking"); 145 } 146 /* Get the flags for the write pipe: */ 147 else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) { 148 /* Abort this application: */ 149 PANIC("Cannot get kernel write pipe flags"); 150 } 151 /* Make the write pipe non-blocking: */ 152 else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) { 153 /* Abort this application: */ 154 PANIC("Cannot get kernel write pipe flags"); 155 } 156 /* Allocate and initialize the ready queue: */ 157 else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_MAX_PRIORITY) != 0) { 158 /* Abort this application: */ 159 PANIC("Cannot allocate priority ready queue."); 160 } 161 /* Allocate memory for the thread structure of the initial thread: */ 162 else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) { 163 /* 164 * Insufficient memory to initialise this application, so 165 * abort: 166 */ 167 PANIC("Cannot allocate memory for initial thread"); 168 } else { 169 /* Zero the global kernel thread structure: */ 170 memset(&_thread_kern_thread, 0, sizeof(struct pthread)); 171 _thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE; 172 memset(_thread_initial, 0, sizeof(struct pthread)); 173 174 /* Initialize the waiting and work queues: */ 175 TAILQ_INIT(&_waitingq); 176 TAILQ_INIT(&_workq); 177 178 /* Initialize the scheduling switch hook routine: */ 179 _sched_switch_hook = NULL; 180 181 /* 182 * Write a magic value to the thread structure 183 * to help identify valid ones: 184 */ 185 _thread_initial->magic = PTHREAD_MAGIC; 186 187 /* Default the priority of the initial thread: */ 188 _thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY; 189 _thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY; 190 _thread_initial->inherited_priority = 0; 191 192 /* Initialise the state of the initial thread: */ 193 _thread_initial->state = PS_RUNNING; 194 195 /* Initialise the queue: */ 196 TAILQ_INIT(&(_thread_initial->join_queue)); 197 198 /* Initialize the owned mutex queue and count: */ 199 TAILQ_INIT(&(_thread_initial->mutexq)); 200 _thread_initial->priority_mutex_count = 0; 201 202 /* Initialise the rest of the fields: */ 203 _thread_initial->poll_data.nfds = 0; 204 _thread_initial->poll_data.fds = NULL; 205 _thread_initial->sig_defer_count = 0; 206 _thread_initial->yield_on_sig_undefer = 0; 207 _thread_initial->specific_data = NULL; 208 _thread_initial->cleanup = NULL; 209 _thread_initial->flags = 0; 210 _thread_initial->error = 0; 211 TAILQ_INIT(&_thread_list); 212 TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle); 213 _thread_run = _thread_initial; 214 215 /* Initialise the global signal action structure: */ 216 sigfillset(&act.sa_mask); 217 act.sa_handler = (void (*) ()) _thread_sig_handler; 218 act.sa_flags = 0; 219 220 /* Initialize signal handling: */ 221 _thread_sig_init(); 222 223 /* Enter a loop to get the existing signal status: */ 224 for (i = 1; i < NSIG; i++) { 225 /* Check for signals which cannot be trapped: */ 226 if (i == SIGKILL || i == SIGSTOP) { 227 } 228 229 /* Get the signal handler details: */ 230 else if (_thread_sys_sigaction(i, NULL, 231 &_thread_sigact[i - 1]) != 0) { 232 /* 233 * Abort this process if signal 234 * initialisation fails: 235 */ 236 PANIC("Cannot read signal handler info"); 237 } 238 } 239 240 /* 241 * Install the signal handler for the most important 242 * signals that the user-thread kernel needs. Actually 243 * SIGINFO isn't really needed, but it is nice to have. 244 */ 245 if (_thread_sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 || 246 _thread_sys_sigaction(SIGINFO, &act, NULL) != 0 || 247 _thread_sys_sigaction(SIGCHLD, &act, NULL) != 0) { 248 /* 249 * Abort this process if signal initialisation fails: 250 */ 251 PANIC("Cannot initialise signal handler"); 252 } 253 254 /* Get the kernel clockrate: */ 255 mib[0] = CTL_KERN; 256 mib[1] = KERN_CLOCKRATE; 257 len = sizeof (struct clockinfo); 258 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0) 259 _clock_res_nsec = clockinfo.tick * 1000; 260 261 /* Get the table size: */ 262 if ((_thread_dtablesize = getdtablesize()) < 0) { 263 /* 264 * Cannot get the system defined table size, so abort 265 * this process. 266 */ 267 PANIC("Cannot get dtablesize"); 268 } 269 /* Allocate memory for the file descriptor table: */ 270 if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) { 271 /* 272 * Cannot allocate memory for the file descriptor 273 * table, so abort this process. 274 */ 275 PANIC("Cannot allocate memory for file descriptor table"); 276 } 277 /* Allocate memory for the pollfd table: */ 278 if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) { 279 /* 280 * Cannot allocate memory for the file descriptor 281 * table, so abort this process. 282 */ 283 PANIC("Cannot allocate memory for pollfd table"); 284 } else { 285 /* 286 * Enter a loop to initialise the file descriptor 287 * table: 288 */ 289 for (i = 0; i < _thread_dtablesize; i++) { 290 /* Initialise the file descriptor table: */ 291 _thread_fd_table[i] = NULL; 292 } 293 294 /* Initialize stdio file descriptor table entries: */ 295 if ((_thread_fd_table_init(0) != 0) || 296 (_thread_fd_table_init(1) != 0) || 297 (_thread_fd_table_init(2) != 0)) { 298 PANIC("Cannot initialize stdio file descriptor " 299 "table entries"); 300 } 301 } 302 } 303 304#ifdef GCC_2_8_MADE_THREAD_AWARE 305 /* Create the thread-specific data for the exception linked list. */ 306 if(pthread_key_create(&except_head_key, NULL) != 0) 307 PANIC("Failed to create thread specific execption head"); 308 309 /* Setup the gcc exception handler per thread. */ 310 __set_dynamic_handler_allocator( dynamic_allocator_handler_fn ); 311#endif /* GCC_2_8_MADE_THREAD_AWARE */ 312 313 /* Initialise the garbage collector mutex and condition variable. */ 314 if (pthread_mutex_init(&_gc_mutex,NULL) != 0 || 315 pthread_cond_init(&_gc_cond,NULL) != 0) 316 PANIC("Failed to initialise garbage collector mutex or condvar"); 317 318 gettimeofday(&kern_inc_prio_time, NULL); 319 320 return; 321} 322 323/* 324 * Special start up code for NetBSD/Alpha 325 */ 326#if defined(__NetBSD__) && defined(__alpha__) 327int 328main(int argc, char *argv[], char *env); 329 330int 331_thread_main(int argc, char *argv[], char *env) 332{ 333 _thread_init(); 334 return (main(argc, argv, env)); 335} 336#endif 337#else 338/* 339 * A stub for non-threaded programs. 340 */ 341void 342_thread_init(void) 343{ 344} 345#endif 346