thr_init.c revision 53812
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: head/lib/libkse/thread/thr_init.c 53812 1999-11-28 05:38:13Z alfred $
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/ioctl.h>
46#include <sys/sysctl.h>
47#include <sys/time.h>
48#include <sys/ttycom.h>
49#include <sys/param.h>
50#include <sys/user.h>
51#include <sys/mman.h>
52#ifdef _THREAD_SAFE
53#include <machine/reg.h>
54#include <pthread.h>
55#include "pthread_private.h"
56
57#ifdef GCC_2_8_MADE_THREAD_AWARE
58typedef void *** (*dynamic_handler_allocator)();
59extern void __set_dynamic_handler_allocator(dynamic_handler_allocator);
60
61static pthread_key_t except_head_key;
62
63typedef struct {
64	void **__dynamic_handler_chain;
65	void *top_elt[2];
66} except_struct;
67
68static void ***dynamic_allocator_handler_fn()
69{
70	except_struct *dh = (except_struct *)pthread_getspecific(except_head_key);
71
72	if(dh == NULL) {
73		dh = (except_struct *)malloc( sizeof(except_struct) );
74		memset(dh, '\0', sizeof(except_struct));
75		dh->__dynamic_handler_chain= dh->top_elt;
76		pthread_setspecific(except_head_key, (void *)dh);
77	}
78	return &dh->__dynamic_handler_chain;
79}
80#endif /* GCC_2_8_MADE_THREAD_AWARE */
81
82/*
83 * Threaded process initialization
84 */
85void
86_thread_init(void)
87{
88	int		fd;
89	int             flags;
90	int             i;
91	size_t		len;
92	int		mib[2];
93	struct clockinfo clockinfo;
94	struct sigaction act;
95
96	/* Check if this function has already been called: */
97	if (_thread_initial)
98		/* Only initialise the threaded application once. */
99		return;
100
101	/*
102	 * Check for the special case of this process running as
103	 * or in place of init as pid = 1:
104	 */
105	if (getpid() == 1) {
106		/*
107		 * Setup a new session for this process which is
108		 * assumed to be running as root.
109		 */
110		if (setsid() == -1)
111			PANIC("Can't set session ID");
112		if (revoke(_PATH_CONSOLE) != 0)
113			PANIC("Can't revoke console");
114		if ((fd = _thread_sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
115			PANIC("Can't open console");
116		if (setlogin("root") == -1)
117			PANIC("Can't set login to root");
118		if (_thread_sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1)
119			PANIC("Can't set controlling terminal");
120		if (_thread_sys_dup2(fd,0) == -1 ||
121		    _thread_sys_dup2(fd,1) == -1 ||
122		    _thread_sys_dup2(fd,2) == -1)
123			PANIC("Can't dup2");
124	}
125
126	/* Get the standard I/O flags before messing with them : */
127	for (i = 0; i < 3; i++)
128		if (((_pthread_stdio_flags[i] =
129		    _thread_sys_fcntl(i,F_GETFL, NULL)) == -1) &&
130		    (errno != EBADF))
131			PANIC("Cannot get stdio flags");
132
133	/*
134	 * Create a pipe that is written to by the signal handler to prevent
135	 * signals being missed in calls to _select:
136	 */
137	if (_thread_sys_pipe(_thread_kern_pipe) != 0) {
138		/* Cannot create pipe, so abort: */
139		PANIC("Cannot create kernel pipe");
140	}
141	/* Get the flags for the read pipe: */
142	else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) {
143		/* Abort this application: */
144		PANIC("Cannot get kernel read pipe flags");
145	}
146	/* Make the read pipe non-blocking: */
147	else if (_thread_sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) {
148		/* Abort this application: */
149		PANIC("Cannot make kernel read pipe non-blocking");
150	}
151	/* Get the flags for the write pipe: */
152	else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) {
153		/* Abort this application: */
154		PANIC("Cannot get kernel write pipe flags");
155	}
156	/* Make the write pipe non-blocking: */
157	else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
158		/* Abort this application: */
159		PANIC("Cannot get kernel write pipe flags");
160	}
161	/* Allocate and initialize the ready queue: */
162	else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_MAX_PRIORITY) != 0) {
163		/* Abort this application: */
164		PANIC("Cannot allocate priority ready queue.");
165	}
166	/* Allocate memory for the thread structure of the initial thread: */
167	else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) {
168		/*
169		 * Insufficient memory to initialise this application, so
170		 * abort:
171		 */
172		PANIC("Cannot allocate memory for initial thread");
173	} else {
174		/* Zero the global kernel thread structure: */
175		memset(&_thread_kern_thread, 0, sizeof(struct pthread));
176		_thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE;
177		memset(_thread_initial, 0, sizeof(struct pthread));
178
179		/* Initialize the waiting and work queues: */
180		TAILQ_INIT(&_waitingq);
181		TAILQ_INIT(&_workq);
182
183		/* Initialize the scheduling switch hook routine: */
184		_sched_switch_hook = NULL;
185
186		/* Initialize the thread stack cache: */
187		SLIST_INIT(&_stackq);
188
189		/* Create the red zone for the main stack. */
190		if (mmap((void *) USRSTACK
191			 - PTHREAD_STACK_INITIAL,
192			 PTHREAD_STACK_GUARD, 0, MAP_ANON,
193			 -1, 0) == MAP_FAILED) {
194			PANIC("Cannot allocate red zone for initial thread");
195		}
196
197		/*
198		 * Write a magic value to the thread structure
199		 * to help identify valid ones:
200		 */
201		_thread_initial->magic = PTHREAD_MAGIC;
202
203		/* Set the initial cancel state */
204		_thread_initial->cancelflags = PTHREAD_CANCEL_ENABLE |
205		    PTHREAD_CANCEL_DEFERRED;
206
207		/* Default the priority of the initial thread: */
208		_thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY;
209		_thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY;
210		_thread_initial->inherited_priority = 0;
211
212		/* Initialise the state of the initial thread: */
213		_thread_initial->state = PS_RUNNING;
214
215		/* Initialise the queue: */
216		TAILQ_INIT(&(_thread_initial->join_queue));
217
218		/* Initialize the owned mutex queue and count: */
219		TAILQ_INIT(&(_thread_initial->mutexq));
220		_thread_initial->priority_mutex_count = 0;
221
222		/* Initialise the rest of the fields: */
223		_thread_initial->poll_data.nfds = 0;
224		_thread_initial->poll_data.fds = NULL;
225		_thread_initial->sig_defer_count = 0;
226		_thread_initial->yield_on_sig_undefer = 0;
227		_thread_initial->specific_data = NULL;
228		_thread_initial->cleanup = NULL;
229		_thread_initial->flags = 0;
230		_thread_initial->error = 0;
231		TAILQ_INIT(&_thread_list);
232		TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle);
233		_thread_run = _thread_initial;
234
235		/* Initialise the global signal action structure: */
236		sigfillset(&act.sa_mask);
237		act.sa_handler = (void (*) ()) _thread_sig_handler;
238		act.sa_flags = 0;
239
240		/* Initialize signal handling: */
241		_thread_sig_init();
242
243		/* Enter a loop to get the existing signal status: */
244		for (i = 1; i < NSIG; i++) {
245			/* Check for signals which cannot be trapped: */
246			if (i == SIGKILL || i == SIGSTOP) {
247			}
248
249			/* Get the signal handler details: */
250			else if (_thread_sys_sigaction(i, NULL,
251						       &_thread_sigact[i - 1]) != 0) {
252				/*
253				 * Abort this process if signal
254				 * initialisation fails:
255				 */
256				PANIC("Cannot read signal handler info");
257			}
258		}
259
260		/*
261		 * Install the signal handler for the most important
262		 * signals that the user-thread kernel needs. Actually
263		 * SIGINFO isn't really needed, but it is nice to have.
264		 */
265		if (_thread_sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 ||
266		    _thread_sys_sigaction(SIGINFO,       &act, NULL) != 0 ||
267		    _thread_sys_sigaction(SIGCHLD,       &act, NULL) != 0) {
268			/*
269			 * Abort this process if signal initialisation fails:
270			 */
271			PANIC("Cannot initialise signal handler");
272		}
273
274		/* Get the kernel clockrate: */
275		mib[0] = CTL_KERN;
276		mib[1] = KERN_CLOCKRATE;
277		len = sizeof (struct clockinfo);
278		if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0)
279			_clock_res_nsec = clockinfo.tick * 1000;
280
281		/* Get the table size: */
282		if ((_thread_dtablesize = getdtablesize()) < 0) {
283			/*
284			 * Cannot get the system defined table size, so abort
285			 * this process.
286			 */
287			PANIC("Cannot get dtablesize");
288		}
289		/* Allocate memory for the file descriptor table: */
290		if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) {
291			/* Avoid accesses to file descriptor table on exit: */
292			_thread_dtablesize = 0;
293
294			/*
295			 * Cannot allocate memory for the file descriptor
296			 * table, so abort this process.
297			 */
298			PANIC("Cannot allocate memory for file descriptor table");
299		}
300		/* Allocate memory for the pollfd table: */
301		if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) {
302			/*
303			 * Cannot allocate memory for the file descriptor
304			 * table, so abort this process.
305			 */
306			PANIC("Cannot allocate memory for pollfd table");
307		} else {
308			/*
309			 * Enter a loop to initialise the file descriptor
310			 * table:
311			 */
312			for (i = 0; i < _thread_dtablesize; i++) {
313				/* Initialise the file descriptor table: */
314				_thread_fd_table[i] = NULL;
315			}
316
317			/* Initialize stdio file descriptor table entries: */
318			for (i = 0; i < 3; i++) {
319				if ((_thread_fd_table_init(i) != 0) &&
320				    (errno != EBADF))
321					PANIC("Cannot initialize stdio file "
322					    "descriptor table entry");
323			}
324		}
325	}
326
327#ifdef GCC_2_8_MADE_THREAD_AWARE
328	/* Create the thread-specific data for the exception linked list. */
329	if(pthread_key_create(&except_head_key, NULL) != 0)
330		PANIC("Failed to create thread specific execption head");
331
332	/* Setup the gcc exception handler per thread. */
333	__set_dynamic_handler_allocator( dynamic_allocator_handler_fn );
334#endif /* GCC_2_8_MADE_THREAD_AWARE */
335
336	/* Initialise the garbage collector mutex and condition variable. */
337	if (pthread_mutex_init(&_gc_mutex,NULL) != 0 ||
338	    pthread_cond_init(&_gc_cond,NULL) != 0)
339		PANIC("Failed to initialise garbage collector mutex or condvar");
340
341	gettimeofday(&kern_inc_prio_time, NULL);
342
343	return;
344}
345
346/*
347 * Special start up code for NetBSD/Alpha
348 */
349#if	defined(__NetBSD__) && defined(__alpha__)
350int
351main(int argc, char *argv[], char *env);
352
353int
354_thread_main(int argc, char *argv[], char *env)
355{
356	_thread_init();
357	return (main(argc, argv, env));
358}
359#endif
360#else
361/*
362 * A stub for non-threaded programs.
363 */
364void
365_thread_init(void)
366{
367}
368#endif
369