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 * $Id: uthread_init.c,v 1.14 1999/07/06 00:25:38 jasone Exp $
35 /* Allocate space for global thread variables here: */
36 #define GLOBAL_PTHREAD_PRIVATE
45 #include <sys/sysctl.h>
47 #include <sys/ttycom.h>
48 #include <sys/types.h>
51 #include <machine/reg.h>
53 #include "pthread_private.h"
55 #ifdef GCC_2_8_MADE_THREAD_AWARE
56 typedef void *** (*dynamic_handler_allocator)();
57 extern void __set_dynamic_handler_allocator(dynamic_handler_allocator);
59 static pthread_key_t except_head_key;
62 void **__dynamic_handler_chain;
66 static void ***dynamic_allocator_handler_fn()
68 except_struct *dh = (except_struct *)pthread_getspecific(except_head_key);
71 dh = (except_struct *)malloc( sizeof(except_struct) );
72 memset(dh, '\0', sizeof(except_struct));
73 dh->__dynamic_handler_chain= dh->top_elt;
74 pthread_setspecific(except_head_key, (void *)dh);
76 return &dh->__dynamic_handler_chain;
78 #endif /* GCC_2_8_MADE_THREAD_AWARE */
81 * Threaded process initialization
91 struct clockinfo clockinfo;
94 /* Check if this function has already been called: */
96 /* Only initialise the threaded application once. */
100 * Check for the special case of this process running as
101 * or in place of init as pid = 1:
105 * Setup a new session for this process which is
106 * assumed to be running as root.
109 PANIC("Can't set session ID");
110 if (revoke(_PATH_CONSOLE) != 0)
111 PANIC("Can't revoke console");
112 if ((fd = _thread_sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
113 PANIC("Can't open console");
114 if (setlogin("root") == -1)
115 PANIC("Can't set login to root");
116 if (_thread_sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1)
117 PANIC("Can't set controlling terminal");
118 if (_thread_sys_dup2(fd,0) == -1 ||
119 _thread_sys_dup2(fd,1) == -1 ||
120 _thread_sys_dup2(fd,2) == -1)
124 /* Get the standard I/O flags before messing with them : */
125 for (i = 0; i < 3; i++)
126 if ((_pthread_stdio_flags[i] =
127 _thread_sys_fcntl(i,F_GETFL, NULL)) == -1)
128 PANIC("Cannot get stdio flags");
131 * Create a pipe that is written to by the signal handler to prevent
132 * signals being missed in calls to _select:
134 if (_thread_sys_pipe(_thread_kern_pipe) != 0) {
135 /* Cannot create pipe, so abort: */
136 PANIC("Cannot create kernel pipe");
138 /* Get the flags for the read pipe: */
139 else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) {
140 /* Abort this application: */
141 PANIC("Cannot get kernel read pipe flags");
143 /* Make the read pipe non-blocking: */
144 else if (_thread_sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) {
145 /* Abort this application: */
146 PANIC("Cannot make kernel read pipe non-blocking");
148 /* Get the flags for the write pipe: */
149 else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) {
150 /* Abort this application: */
151 PANIC("Cannot get kernel write pipe flags");
153 /* Make the write pipe non-blocking: */
154 else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
155 /* Abort this application: */
156 PANIC("Cannot get kernel write pipe flags");
158 /* Allocate and initialize the ready queue: */
159 else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_MAX_PRIORITY) != 0) {
160 /* Abort this application: */
161 PANIC("Cannot allocate priority ready queue.");
163 /* Allocate memory for the thread structure of the initial thread: */
164 else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) {
166 * Insufficient memory to initialise this application, so
169 PANIC("Cannot allocate memory for initial thread");
171 /* Zero the global kernel thread structure: */
172 memset(&_thread_kern_thread, 0, sizeof(struct pthread));
173 _thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE;
174 memset(_thread_initial, 0, sizeof(struct pthread));
176 /* Initialize the waiting and work queues: */
177 TAILQ_INIT(&_waitingq);
180 /* Initialize the scheduling switch hook routine: */
181 _sched_switch_hook = NULL;
183 /* Initialize the thread stack cache: */
184 SLIST_INIT(&_stackq);
186 /* Create the red zone for the main stack. */
187 if (mmap((void *) PTHREAD_STACK_TOP
188 - PTHREAD_STACK_INITIAL,
189 PTHREAD_STACK_GUARD, 0, MAP_ANON,
190 -1, 0) == MAP_FAILED) {
191 PANIC("Cannot allocate red zone for initial thread");
195 * Write a magic value to the thread structure
196 * to help identify valid ones:
198 _thread_initial->magic = PTHREAD_MAGIC;
200 /* Default the priority of the initial thread: */
201 _thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY;
202 _thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY;
203 _thread_initial->inherited_priority = 0;
205 /* Initialise the state of the initial thread: */
206 _thread_initial->state = PS_RUNNING;
208 /* Initialise the queue: */
209 TAILQ_INIT(&(_thread_initial->join_queue));
211 /* Initialize the owned mutex queue and count: */
212 TAILQ_INIT(&(_thread_initial->mutexq));
213 _thread_initial->priority_mutex_count = 0;
215 /* Initialise the rest of the fields: */
216 _thread_initial->poll_data.nfds = 0;
217 _thread_initial->poll_data.fds = NULL;
218 _thread_initial->sig_defer_count = 0;
219 _thread_initial->yield_on_sig_undefer = 0;
220 _thread_initial->specific_data = NULL;
221 _thread_initial->cleanup = NULL;
222 _thread_initial->flags = 0;
223 _thread_initial->error = 0;
224 TAILQ_INIT(&_thread_list);
225 TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle);
226 _thread_run = _thread_initial;
228 /* Initialise the global signal action structure: */
229 sigfillset(&act.sa_mask);
230 act.sa_handler = (void (*) ()) _thread_sig_handler;
233 /* Initialize signal handling: */
236 /* Enter a loop to get the existing signal status: */
237 for (i = 1; i < NSIG; i++) {
238 /* Check for signals which cannot be trapped: */
239 if (i == SIGKILL || i == SIGSTOP) {
242 /* Get the signal handler details: */
243 else if (_thread_sys_sigaction(i, NULL,
244 &_thread_sigact[i - 1]) != 0) {
246 * Abort this process if signal
247 * initialisation fails:
249 PANIC("Cannot read signal handler info");
254 * Install the signal handler for the most important
255 * signals that the user-thread kernel needs. Actually
256 * SIGINFO isn't really needed, but it is nice to have.
258 if (_thread_sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 ||
259 _thread_sys_sigaction(SIGINFO, &act, NULL) != 0 ||
260 _thread_sys_sigaction(SIGCHLD, &act, NULL) != 0) {
262 * Abort this process if signal initialisation fails:
264 PANIC("Cannot initialise signal handler");
267 /* Get the kernel clockrate: */
269 mib[1] = KERN_CLOCKRATE;
270 len = sizeof (struct clockinfo);
271 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0)
272 _clock_res_nsec = clockinfo.tick * 1000;
274 /* Get the table size: */
275 if ((_thread_dtablesize = getdtablesize()) < 0) {
277 * Cannot get the system defined table size, so abort
280 PANIC("Cannot get dtablesize");
282 /* Allocate memory for the file descriptor table: */
283 if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) {
285 * Cannot allocate memory for the file descriptor
286 * table, so abort this process.
288 PANIC("Cannot allocate memory for file descriptor table");
290 /* Allocate memory for the pollfd table: */
291 if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) {
293 * Cannot allocate memory for the file descriptor
294 * table, so abort this process.
296 PANIC("Cannot allocate memory for pollfd table");
299 * Enter a loop to initialise the file descriptor
302 for (i = 0; i < _thread_dtablesize; i++) {
303 /* Initialise the file descriptor table: */
304 _thread_fd_table[i] = NULL;
307 /* Initialize stdio file descriptor table entries: */
308 if ((_thread_fd_table_init(0) != 0) ||
309 (_thread_fd_table_init(1) != 0) ||
310 (_thread_fd_table_init(2) != 0)) {
311 PANIC("Cannot initialize stdio file descriptor "
317 #ifdef GCC_2_8_MADE_THREAD_AWARE
318 /* Create the thread-specific data for the exception linked list. */
319 if(pthread_key_create(&except_head_key, NULL) != 0)
320 PANIC("Failed to create thread specific execption head");
322 /* Setup the gcc exception handler per thread. */
323 __set_dynamic_handler_allocator( dynamic_allocator_handler_fn );
324 #endif /* GCC_2_8_MADE_THREAD_AWARE */
326 /* Initialise the garbage collector mutex and condition variable. */
327 if (pthread_mutex_init(&_gc_mutex,NULL) != 0 ||
328 pthread_cond_init(&_gc_cond,NULL) != 0)
329 PANIC("Failed to initialise garbage collector mutex or condvar");
331 gettimeofday(&kern_inc_prio_time, NULL);
337 * Special start up code for NetBSD/Alpha
339 #if defined(__NetBSD__) && defined(__alpha__)
341 main(int argc, char *argv[], char *env);
344 _thread_main(int argc, char *argv[], char *env)
347 return (main(argc, argv, env));
352 * A stub for non-threaded programs.