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
35 /* Allocate space for global thread variables here: */
36 #define GLOBAL_PTHREAD_PRIVATE
38 #include "namespace.h"
39 #include <sys/param.h>
40 #include <sys/types.h>
41 #include <machine/reg.h>
43 #include <sys/ioctl.h>
44 #include <sys/mount.h>
46 #include <sys/socket.h>
47 #include <sys/event.h>
49 #include <sys/sysctl.h>
51 #include <sys/ttycom.h>
66 #include "un-namespace.h"
68 #include "pthread_private.h"
71 * All weak references used within libc should be in this table.
72 * This will is so that static libraries will work.
74 static void *references[] = {
99 &_pthread_getspecific,
100 &_pthread_key_create,
101 &_pthread_key_delete,
102 &_pthread_mutex_destroy,
103 &_pthread_mutex_init,
104 &_pthread_mutex_lock,
105 &_pthread_mutex_trylock,
106 &_pthread_mutex_unlock,
107 &_pthread_mutexattr_init,
108 &_pthread_mutexattr_destroy,
109 &_pthread_mutexattr_settype,
111 &_pthread_setspecific,
131 * These are needed when linking statically. All references within
132 * libgcc (and in the future libc) to these routines are weak, but
133 * if they are not (strongly) referenced by the application or other
134 * libraries, then the actual functions will not be loaded.
136 static void *libgcc_references[] = {
138 &_pthread_key_create,
139 &_pthread_key_delete,
140 &_pthread_getspecific,
141 &_pthread_setspecific,
142 &_pthread_mutex_init,
143 &_pthread_mutex_destroy,
144 &_pthread_mutex_lock,
145 &_pthread_mutex_trylock,
146 &_pthread_mutex_unlock
151 * Threaded process initialization
161 struct clockinfo clockinfo;
162 struct sigaction act;
164 /* Check if this function has already been called: */
166 /* Only initialise the threaded application once. */
170 * Make gcc quiescent about {,libgcc_}references not being
173 if ((references[0] == NULL) || (libgcc_references[0] == NULL))
174 PANIC("Failed loading mandatory references in _thread_init");
177 * Check for the special case of this process running as
178 * or in place of init as pid = 1:
182 * Setup a new session for this process which is
183 * assumed to be running as root.
186 PANIC("Can't set session ID");
187 if (revoke(_PATH_CONSOLE) != 0)
188 PANIC("Can't revoke console");
189 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
190 PANIC("Can't open console");
191 if (setlogin("root") == -1)
192 PANIC("Can't set login to root");
193 if (__sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1)
194 PANIC("Can't set controlling terminal");
195 if (__sys_dup2(fd,0) == -1 ||
196 __sys_dup2(fd,1) == -1 ||
197 __sys_dup2(fd,2) == -1)
201 /* Get the standard I/O flags before messing with them : */
202 for (i = 0; i < 3; i++)
203 if (((_pthread_stdio_flags[i] =
204 __sys_fcntl(i,F_GETFL, NULL)) == -1) &&
206 PANIC("Cannot get stdio flags");
209 * Create a pipe that is written to by the signal handler to prevent
210 * signals being missed in calls to _select:
212 if (__sys_pipe(_thread_kern_pipe) != 0) {
213 /* Cannot create pipe, so abort: */
214 PANIC("Cannot create kernel pipe");
216 /* Get the flags for the read pipe: */
217 else if ((flags = __sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) {
218 /* Abort this application: */
219 PANIC("Cannot get kernel read pipe flags");
221 /* Make the read pipe non-blocking: */
222 else if (__sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) {
223 /* Abort this application: */
224 PANIC("Cannot make kernel read pipe non-blocking");
226 /* Get the flags for the write pipe: */
227 else if ((flags = __sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) {
228 /* Abort this application: */
229 PANIC("Cannot get kernel write pipe flags");
231 /* Make the write pipe non-blocking: */
232 else if (__sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
233 /* Abort this application: */
234 PANIC("Cannot get kernel write pipe flags");
236 /* Allocate and initialize the ready queue: */
237 else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_LAST_PRIORITY) != 0) {
238 /* Abort this application: */
239 PANIC("Cannot allocate priority ready queue.");
241 /* Allocate memory for the thread structure of the initial thread: */
242 else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) {
244 * Insufficient memory to initialise this application, so
247 PANIC("Cannot allocate memory for initial thread");
249 /* Allocate memory for the scheduler stack: */
250 else if ((_thread_kern_sched_stack = malloc(SCHED_STACK_SIZE)) == NULL)
251 PANIC("Failed to allocate stack for scheduler");
253 /* Zero the global kernel thread structure: */
254 memset(&_thread_kern_thread, 0, sizeof(struct pthread));
255 _thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE;
256 memset(_thread_initial, 0, sizeof(struct pthread));
258 /* Initialize the waiting and work queues: */
259 TAILQ_INIT(&_waitingq);
262 /* Initialize the scheduling switch hook routine: */
263 _sched_switch_hook = NULL;
265 /* Give this thread default attributes: */
266 memcpy((void *) &_thread_initial->attr, &pthread_attr_default,
267 sizeof(struct pthread_attr));
270 * Create a red zone below the main stack. All other stacks are
271 * constrained to a maximum size by the paramters passed to
272 * mmap(), but this stack is only limited by resource limits, so
273 * this stack needs an explicitly mapped red zone to protect the
274 * thread stack that is just beyond.
276 if (mmap((void *) USRSTACK - PTHREAD_STACK_INITIAL -
277 PTHREAD_GUARD_DEFAULT, PTHREAD_GUARD_DEFAULT, 0, MAP_ANON,
278 -1, 0) == MAP_FAILED)
279 PANIC("Cannot allocate red zone for initial thread");
281 /* Set the main thread stack pointer. */
282 _thread_initial->stack = (void *) USRSTACK -
283 PTHREAD_STACK_INITIAL;
285 /* Set the stack attributes: */
286 _thread_initial->attr.stackaddr_attr = _thread_initial->stack;
287 _thread_initial->attr.stacksize_attr = PTHREAD_STACK_INITIAL;
289 /* Setup the context for the scheduler: */
290 _setjmp(_thread_kern_sched_jb);
291 SET_STACK_JB(_thread_kern_sched_jb, _thread_kern_sched_stack +
292 SCHED_STACK_SIZE - sizeof(double));
293 SET_RETURN_ADDR_JB(_thread_kern_sched_jb, _thread_kern_scheduler);
296 * Write a magic value to the thread structure
297 * to help identify valid ones:
299 _thread_initial->magic = PTHREAD_MAGIC;
301 /* Set the initial cancel state */
302 _thread_initial->cancelflags = PTHREAD_CANCEL_ENABLE |
303 PTHREAD_CANCEL_DEFERRED;
305 /* Default the priority of the initial thread: */
306 _thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY;
307 _thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY;
308 _thread_initial->inherited_priority = 0;
310 /* Initialise the state of the initial thread: */
311 _thread_initial->state = PS_RUNNING;
313 /* Set the name of the thread: */
314 _thread_initial->name = strdup("_thread_initial");
316 /* Initialize joiner to NULL (no joiner): */
317 _thread_initial->joiner = NULL;
319 /* Initialize the owned mutex queue and count: */
320 TAILQ_INIT(&(_thread_initial->mutexq));
321 _thread_initial->priority_mutex_count = 0;
323 /* Initialize the global scheduling time: */
325 gettimeofday((struct timeval *) &_sched_tod, NULL);
327 /* Initialize last active: */
328 _thread_initial->last_active = (long) _sched_ticks;
330 /* Initialize the initial context: */
331 _thread_initial->curframe = NULL;
332 _thread_initial->ctxtype = CTX_JB_NOSIG;
334 /* Initialise the rest of the fields: */
335 _thread_initial->poll_data.nfds = 0;
336 _thread_initial->poll_data.fds = NULL;
337 _thread_initial->sig_defer_count = 0;
338 _thread_initial->yield_on_sig_undefer = 0;
339 _thread_initial->specific_data = NULL;
340 _thread_initial->cleanup = NULL;
341 _thread_initial->flags = 0;
342 _thread_initial->error = 0;
343 TAILQ_INIT(&_thread_list);
344 TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle);
345 _set_curthread(_thread_initial);
347 /* Initialise the global signal action structure: */
348 sigfillset(&act.sa_mask);
349 act.sa_handler = (void (*) ()) _thread_sig_handler;
350 act.sa_flags = SA_SIGINFO | SA_ONSTACK;
352 /* Clear pending signals for the process: */
353 sigemptyset(&_process_sigpending);
355 /* Clear the signal queue: */
356 memset(_thread_sigq, 0, sizeof(_thread_sigq));
359 * Create and install an alternate signal stack of
360 * the recommended size:
362 _thread_sigstack.ss_sp = malloc(SIGSTKSZ);
363 _thread_sigstack.ss_size = SIGSTKSZ;
364 _thread_sigstack.ss_flags = 0;
365 if ((_thread_sigstack.ss_sp == NULL) ||
366 (__sys_sigaltstack(&_thread_sigstack, NULL) != 0))
367 PANIC("Unable to install alternate signal stack");
369 /* Enter a loop to get the existing signal status: */
370 for (i = 1; i < NSIG; i++) {
371 /* Check for signals which cannot be trapped: */
372 if (i == SIGKILL || i == SIGSTOP) {
375 /* Get the signal handler details: */
376 else if (__sys_sigaction(i, NULL,
377 &_thread_sigact[i - 1]) != 0) {
379 * Abort this process if signal
380 * initialisation fails:
382 PANIC("Cannot read signal handler info");
385 /* Initialize the SIG_DFL dummy handler count. */
386 _thread_dfl_count[i] = 0;
390 * Install the signal handler for the most important
391 * signals that the user-thread kernel needs. Actually
392 * SIGINFO isn't really needed, but it is nice to have.
394 if (__sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 ||
395 __sys_sigaction(SIGINFO, &act, NULL) != 0 ||
396 __sys_sigaction(SIGCHLD, &act, NULL) != 0) {
398 * Abort this process if signal initialisation fails:
400 PANIC("Cannot initialise signal handler");
402 _thread_sigact[_SCHED_SIGNAL - 1].sa_flags = SA_SIGINFO;
403 _thread_sigact[SIGINFO - 1].sa_flags = SA_SIGINFO;
404 _thread_sigact[SIGCHLD - 1].sa_flags = SA_SIGINFO;
406 /* Get the process signal mask: */
407 __sys_sigprocmask(SIG_SETMASK, NULL, &_process_sigmask);
409 /* Get the kernel clockrate: */
411 mib[1] = KERN_CLOCKRATE;
412 len = sizeof (struct clockinfo);
413 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0)
414 _clock_res_usec = clockinfo.tick > CLOCK_RES_USEC_MIN ?
415 clockinfo.tick : CLOCK_RES_USEC_MIN;
417 /* Get the table size: */
418 if ((_thread_dtablesize = getdtablesize()) < 0) {
420 * Cannot get the system defined table size, so abort
423 PANIC("Cannot get dtablesize");
425 /* Allocate memory for the file descriptor table: */
426 if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) {
427 /* Avoid accesses to file descriptor table on exit: */
428 _thread_dtablesize = 0;
431 * Cannot allocate memory for the file descriptor
432 * table, so abort this process.
434 PANIC("Cannot allocate memory for file descriptor table");
436 /* Allocate memory for the pollfd table: */
437 if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) {
439 * Cannot allocate memory for the file descriptor
440 * table, so abort this process.
442 PANIC("Cannot allocate memory for pollfd table");
445 * Enter a loop to initialise the file descriptor
448 for (i = 0; i < _thread_dtablesize; i++) {
449 /* Initialise the file descriptor table: */
450 _thread_fd_table[i] = NULL;
453 /* Initialize stdio file descriptor table entries: */
454 for (i = 0; i < 3; i++) {
455 if ((_thread_fd_table_init(i) != 0) &&
457 PANIC("Cannot initialize stdio file "
458 "descriptor table entry");
463 /* Initialise the garbage collector mutex and condition variable. */
464 if (_pthread_mutex_init(&_gc_mutex,NULL) != 0 ||
465 pthread_cond_init(&_gc_cond,NULL) != 0)
466 PANIC("Failed to initialise garbage collector mutex or condvar");
470 * Special start up code for NetBSD/Alpha
472 #if defined(__NetBSD__) && defined(__alpha__)
474 main(int argc, char *argv[], char *env);
477 _thread_main(int argc, char *argv[], char *env)
480 return (main(argc, argv, env));