2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
32 * $FreeBSD: src/lib/libc_r/uthread/uthread_init.c,v 1.23.2.11 2003/02/24 23:27:32 das Exp $
35 /* Allocate space for global thread variables here: */
36 #define GLOBAL_PTHREAD_PRIVATE
45 #include <sys/ioctl.h>
46 #include <sys/sysctl.h>
48 #include <sys/ttycom.h>
49 #include <sys/param.h>
52 #include <machine/reg.h>
54 #include "pthread_private.h"
57 * These are needed when linking statically. All references within
58 * libgcc (and in the future libc) to these routines are weak, but
59 * if they are not (strongly) referenced by the application or other
60 * libraries, then the actual functions will not be loaded.
62 static void *thread_references[] = {
66 &_pthread_getspecific,
67 &_pthread_setspecific,
69 &_pthread_mutex_destroy,
71 &_pthread_mutex_trylock,
72 &_pthread_mutex_unlock,
74 &_pthread_cond_destroy,
76 &_pthread_cond_timedwait,
77 &_pthread_cond_signal,
78 &_pthread_cond_broadcast
81 #ifdef GCC_2_8_MADE_THREAD_AWARE
82 typedef void *** (*dynamic_handler_allocator)();
83 extern void __set_dynamic_handler_allocator(dynamic_handler_allocator);
85 static pthread_key_t except_head_key;
88 void **__dynamic_handler_chain;
92 static void ***dynamic_allocator_handler_fn()
94 except_struct *dh = (except_struct *)pthread_getspecific(except_head_key);
97 dh = (except_struct *)malloc( sizeof(except_struct) );
98 memset(dh, '\0', sizeof(except_struct));
99 dh->__dynamic_handler_chain= dh->top_elt;
100 pthread_setspecific(except_head_key, (void *)dh);
102 return &dh->__dynamic_handler_chain;
104 #endif /* GCC_2_8_MADE_THREAD_AWARE */
107 * Threaded process initialization
117 struct clockinfo clockinfo;
118 struct sigaction act;
120 /* Check if this function has already been called: */
122 /* Only initialise the threaded application once. */
126 * Make gcc quiescent about thread_references not being
129 if (thread_references[0] == NULL)
130 PANIC("Mandatory pthread_* functions not loaded");
133 * Check for the special case of this process running as
134 * or in place of init as pid = 1:
138 * Setup a new session for this process which is
139 * assumed to be running as root.
142 PANIC("Can't set session ID");
143 if (revoke(_PATH_CONSOLE) != 0)
144 PANIC("Can't revoke console");
145 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
146 PANIC("Can't open console");
147 if (setlogin("root") == -1)
148 PANIC("Can't set login to root");
149 if (__sys_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1)
150 PANIC("Can't set controlling terminal");
151 if (__sys_dup2(fd, 0) == -1 ||
152 __sys_dup2(fd, 1) == -1 ||
153 __sys_dup2(fd, 2) == -1)
157 /* Get the standard I/O flags before messing with them : */
158 for (i = 0; i < 3; i++) {
159 if (((_pthread_stdio_flags[i] =
160 __sys_fcntl(i, F_GETFL, NULL)) == -1) &&
162 PANIC("Cannot get stdio flags");
166 * Create a pipe that is written to by the signal handler to prevent
167 * signals being missed in calls to _select:
169 if (__sys_pipe(_thread_kern_pipe) != 0) {
170 /* Cannot create pipe, so abort: */
171 PANIC("Cannot create kernel pipe");
175 * Make sure the pipe does not get in the way of stdio:
177 for (i = 0; i < 2; i++) {
178 if (_thread_kern_pipe[i] < 3) {
179 fd = __sys_fcntl(_thread_kern_pipe[i], F_DUPFD, 3);
181 PANIC("Cannot create kernel pipe");
182 __sys_close(_thread_kern_pipe[i]);
183 _thread_kern_pipe[i] = fd;
186 /* Get the flags for the read pipe: */
187 if ((flags = __sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) {
188 /* Abort this application: */
189 PANIC("Cannot get kernel read pipe flags");
191 /* Make the read pipe non-blocking: */
192 else if (__sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) {
193 /* Abort this application: */
194 PANIC("Cannot make kernel read pipe non-blocking");
196 /* Get the flags for the write pipe: */
197 else if ((flags = __sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) {
198 /* Abort this application: */
199 PANIC("Cannot get kernel write pipe flags");
201 /* Make the write pipe non-blocking: */
202 else if (__sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
203 /* Abort this application: */
204 PANIC("Cannot get kernel write pipe flags");
206 /* Allocate and initialize the ready queue: */
207 else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_LAST_PRIORITY) != 0) {
208 /* Abort this application: */
209 PANIC("Cannot allocate priority ready queue.");
211 /* Allocate memory for the thread structure of the initial thread: */
212 else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) {
214 * Insufficient memory to initialise this application, so
217 PANIC("Cannot allocate memory for initial thread");
219 /* Allocate memory for the scheduler stack: */
220 else if ((_thread_kern_sched_stack = malloc(SCHED_STACK_SIZE)) == NULL)
221 PANIC("Failed to allocate stack for scheduler");
223 /* Zero the global kernel thread structure: */
224 memset(&_thread_kern_thread, 0, sizeof(struct pthread));
225 _thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE;
226 memset(_thread_initial, 0, sizeof(struct pthread));
228 /* Initialize the waiting and work queues: */
229 TAILQ_INIT(&_waitingq);
232 /* Initialize the scheduling switch hook routine: */
233 _sched_switch_hook = NULL;
235 /* Give this thread default attributes: */
236 memcpy((void *) &_thread_initial->attr, &pthread_attr_default,
237 sizeof(struct pthread_attr));
239 /* Initialize the thread stack cache: */
240 SLIST_INIT(&_stackq);
242 /* Find the stack top */
244 mib[1] = KERN_USRSTACK;
246 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1)
247 _usrstack = (void *)USRSTACK;
248 _next_stack = _usrstack - PTHREAD_STACK_INITIAL -
249 PTHREAD_STACK_DEFAULT - (2 * PTHREAD_STACK_GUARD);
251 * Create a red zone below the main stack. All other stacks are
252 * constrained to a maximum size by the paramters passed to
253 * mmap(), but this stack is only limited by resource limits, so
254 * this stack needs an explicitly mapped red zone to protect the
255 * thread stack that is just beyond.
257 if (mmap(_usrstack - PTHREAD_STACK_INITIAL -
258 PTHREAD_STACK_GUARD, PTHREAD_STACK_GUARD, 0, MAP_ANON,
259 -1, 0) == MAP_FAILED)
260 PANIC("Cannot allocate red zone for initial thread");
262 /* Set the main thread stack pointer. */
263 _thread_initial->stack = _usrstack - PTHREAD_STACK_INITIAL;
265 /* Set the stack attributes: */
266 _thread_initial->attr.stackaddr_attr = _thread_initial->stack;
267 _thread_initial->attr.stacksize_attr = PTHREAD_STACK_INITIAL;
269 /* Setup the context for the scheduler: */
270 _setjmp(_thread_kern_sched_jb);
271 SET_STACK_JB(_thread_kern_sched_jb, _thread_kern_sched_stack +
272 SCHED_STACK_SIZE - sizeof(double));
273 SET_RETURN_ADDR_JB(_thread_kern_sched_jb, _thread_kern_scheduler);
276 * Write a magic value to the thread structure
277 * to help identify valid ones:
279 _thread_initial->magic = PTHREAD_MAGIC;
281 /* Set the initial cancel state */
282 _thread_initial->cancelflags = PTHREAD_CANCEL_ENABLE |
283 PTHREAD_CANCEL_DEFERRED;
285 /* Default the priority of the initial thread: */
286 _thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY;
287 _thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY;
288 _thread_initial->inherited_priority = 0;
290 /* Initialise the state of the initial thread: */
291 _thread_initial->state = PS_RUNNING;
293 /* Set the name of the thread: */
294 _thread_initial->name = strdup("_thread_initial");
296 /* Initialize joiner to NULL (no joiner): */
297 _thread_initial->joiner = NULL;
299 /* Initialize the owned mutex queue and count: */
300 TAILQ_INIT(&(_thread_initial->mutexq));
301 _thread_initial->priority_mutex_count = 0;
303 /* Initialize the global scheduling time: */
305 gettimeofday((struct timeval *) &_sched_tod, NULL);
307 /* Initialize last active: */
308 _thread_initial->last_active = (long) _sched_ticks;
310 /* Initialize the initial context: */
311 _thread_initial->curframe = NULL;
313 /* Initialise the rest of the fields: */
314 _thread_initial->poll_data.nfds = 0;
315 _thread_initial->poll_data.fds = NULL;
316 _thread_initial->sig_defer_count = 0;
317 _thread_initial->yield_on_sig_undefer = 0;
318 _thread_initial->specific_data = NULL;
319 _thread_initial->cleanup = NULL;
320 _thread_initial->flags = 0;
321 _thread_initial->error = 0;
322 TAILQ_INIT(&_thread_list);
323 TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle);
324 _set_curthread(_thread_initial);
326 /* Initialise the global signal action structure: */
327 sigfillset(&act.sa_mask);
328 act.sa_handler = (void (*) ()) _thread_sig_handler;
329 act.sa_flags = SA_SIGINFO | SA_RESTART;
331 /* Clear pending signals for the process: */
332 sigemptyset(&_process_sigpending);
334 /* Clear the signal queue: */
335 memset(_thread_sigq, 0, sizeof(_thread_sigq));
337 /* Enter a loop to get the existing signal status: */
338 for (i = 1; i < NSIG; i++) {
339 /* Check for signals which cannot be trapped: */
340 if (i == SIGKILL || i == SIGSTOP) {
343 /* Get the signal handler details: */
344 else if (__sys_sigaction(i, NULL,
345 &_thread_sigact[i - 1]) != 0) {
347 * Abort this process if signal
348 * initialisation fails:
350 PANIC("Cannot read signal handler info");
353 /* Initialize the SIG_DFL dummy handler count. */
354 _thread_dfl_count[i] = 0;
358 * Install the signal handler for the most important
359 * signals that the user-thread kernel needs. Actually
360 * SIGINFO isn't really needed, but it is nice to have.
362 if (__sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 ||
363 __sys_sigaction(SIGINFO, &act, NULL) != 0 ||
364 __sys_sigaction(SIGCHLD, &act, NULL) != 0) {
366 * Abort this process if signal initialisation fails:
368 PANIC("Cannot initialise signal handler");
370 _thread_sigact[_SCHED_SIGNAL - 1].sa_flags = SA_SIGINFO;
371 _thread_sigact[SIGINFO - 1].sa_flags = SA_SIGINFO;
372 _thread_sigact[SIGCHLD - 1].sa_flags = SA_SIGINFO;
374 /* Get the process signal mask: */
375 __sys_sigprocmask(SIG_SETMASK, NULL, &_process_sigmask);
377 /* Get the kernel clockrate: */
379 mib[1] = KERN_CLOCKRATE;
380 len = sizeof (struct clockinfo);
381 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0)
382 _clock_res_usec = clockinfo.tick > CLOCK_RES_USEC_MIN ?
383 clockinfo.tick : CLOCK_RES_USEC_MIN;
385 /* Get the table size: */
386 if ((_thread_dtablesize = getdtablesize()) < 0) {
388 * Cannot get the system defined table size, so abort
391 PANIC("Cannot get dtablesize");
393 /* Allocate memory for the file descriptor table: */
394 if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) {
395 /* Avoid accesses to file descriptor table on exit: */
396 _thread_dtablesize = 0;
399 * Cannot allocate memory for the file descriptor
400 * table, so abort this process.
402 PANIC("Cannot allocate memory for file descriptor table");
404 /* Allocate memory for the pollfd table: */
405 if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) {
407 * Cannot allocate memory for the file descriptor
408 * table, so abort this process.
410 PANIC("Cannot allocate memory for pollfd table");
413 * Enter a loop to initialise the file descriptor
416 for (i = 0; i < _thread_dtablesize; i++) {
417 /* Initialise the file descriptor table: */
418 _thread_fd_table[i] = NULL;
421 /* Initialize stdio file descriptor table entries: */
422 for (i = 0; i < 3; i++) {
423 if ((_thread_fd_table_init(i) != 0) &&
425 PANIC("Cannot initialize stdio file "
426 "descriptor table entry");
431 #ifdef GCC_2_8_MADE_THREAD_AWARE
432 /* Create the thread-specific data for the exception linked list. */
433 if(pthread_key_create(&except_head_key, NULL) != 0)
434 PANIC("Failed to create thread specific execption head");
436 /* Setup the gcc exception handler per thread. */
437 __set_dynamic_handler_allocator( dynamic_allocator_handler_fn );
438 #endif /* GCC_2_8_MADE_THREAD_AWARE */
440 /* Initialise the garbage collector mutex and condition variable. */
441 if (pthread_mutex_init(&_gc_mutex,NULL) != 0 ||
442 pthread_cond_init(&_gc_cond,NULL) != 0)
443 PANIC("Failed to initialise garbage collector mutex or condvar");
447 * Special start up code for NetBSD/Alpha
449 #if defined(__NetBSD__) && defined(__alpha__)
451 main(int argc, char *argv[], char *env);
454 _thread_main(int argc, char *argv[], char *env)
457 return (main(argc, argv, env));