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
38 #include <sys/user.h> /* MUST BE FIRST */
46 #include <sys/ioctl.h>
47 #include <sys/sysctl.h>
49 #include <sys/ttycom.h>
50 #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
110 void _thread_init(void) __attribute__((constructor
));
119 struct clockinfo clockinfo
;
120 struct sigaction act
;
122 /* Check if this function has already been called: */
124 /* Only initialise the threaded application once. */
128 * Make gcc quiescent about thread_references not being
131 if (thread_references
[0] == NULL
)
132 PANIC("Mandatory pthread_* functions not loaded");
135 * Check for the special case of this process running as
136 * or in place of init as pid = 1:
140 * Setup a new session for this process which is
141 * assumed to be running as root.
144 PANIC("Can't set session ID");
145 if (revoke(_PATH_CONSOLE
) != 0)
146 PANIC("Can't revoke console");
147 if ((fd
= __sys_open(_PATH_CONSOLE
, O_RDWR
)) < 0)
148 PANIC("Can't open console");
149 if (setlogin("root") == -1)
150 PANIC("Can't set login to root");
151 if (__sys_ioctl(fd
, TIOCSCTTY
, NULL
) == -1)
152 PANIC("Can't set controlling terminal");
153 if (__sys_dup2(fd
, 0) == -1 ||
154 __sys_dup2(fd
, 1) == -1 ||
155 __sys_dup2(fd
, 2) == -1)
159 /* Get the standard I/O flags before messing with them : */
160 for (i
= 0; i
< 3; i
++) {
161 if (((_pthread_stdio_flags
[i
] =
162 __sys_fcntl(i
, F_GETFL
, NULL
)) == -1) &&
164 PANIC("Cannot get stdio flags");
168 * Create a pipe that is written to by the signal handler to prevent
169 * signals being missed in calls to _select:
173 /* Allocate and initialize the ready queue: */
174 if (_pq_alloc(&_readyq
, PTHREAD_MIN_PRIORITY
, PTHREAD_LAST_PRIORITY
) != 0) {
175 /* Abort this application: */
176 PANIC("Cannot allocate priority ready queue.");
178 /* Allocate memory for the thread structure of the initial thread: */
179 else if ((_thread_initial
= (pthread_t
) malloc(sizeof(struct pthread
))) == NULL
) {
181 * Insufficient memory to initialise this application, so
184 PANIC("Cannot allocate memory for initial thread");
186 /* Allocate memory for the scheduler stack: */
187 else if ((_thread_kern_sched_stack
= malloc(SCHED_STACK_SIZE
)) == NULL
)
188 PANIC("Failed to allocate stack for scheduler");
190 /* Zero the global kernel thread structure: */
191 memset(&_thread_kern_thread
, 0, sizeof(struct pthread
));
192 _thread_kern_thread
.flags
= PTHREAD_FLAGS_PRIVATE
;
193 _thread_kern_thread
.tcb
= _libc_allocate_tls();
194 memset(_thread_initial
, 0, sizeof(struct pthread
));
196 /* Initialize the waiting and work queues: */
197 TAILQ_INIT(&_waitingq
);
200 /* Initialize the scheduling switch hook routine: */
201 _sched_switch_hook
= NULL
;
203 /* Give this thread default attributes: */
204 memcpy((void *) &_thread_initial
->attr
, &pthread_attr_default
,
205 sizeof(struct pthread_attr
));
207 /* Initialize the thread stack cache: */
208 SLIST_INIT(&_stackq
);
210 /* Find the stack top */
212 mib
[1] = KERN_USRSTACK
;
214 if (sysctl(mib
, 2, &_usrstack
, &len
, NULL
, 0) == -1)
215 _usrstack
= (void *)USRSTACK
;
216 _next_stack
= _usrstack
- PTHREAD_STACK_INITIAL
-
217 PTHREAD_STACK_DEFAULT
- (2 * PTHREAD_STACK_GUARD
);
219 * Create a red zone below the main stack. All other stacks are
220 * constrained to a maximum size by the paramters passed to
221 * mmap(), but this stack is only limited by resource limits, so
222 * this stack needs an explicitly mapped red zone to protect the
223 * thread stack that is just beyond.
225 if (mmap(_usrstack
- PTHREAD_STACK_INITIAL
-
226 PTHREAD_STACK_GUARD
, PTHREAD_STACK_GUARD
, 0,
227 MAP_ANON
| MAP_TRYFIXED
, -1, 0) == MAP_FAILED
)
228 PANIC("Cannot allocate red zone for initial thread");
230 _thread_initial
->tcb
= tls_get_tcb();
231 /* Set the main thread stack pointer. */
232 _thread_initial
->stack
= _usrstack
- PTHREAD_STACK_INITIAL
;
234 /* Set the stack attributes: */
235 _thread_initial
->attr
.stackaddr_attr
= _thread_initial
->stack
;
236 _thread_initial
->attr
.stacksize_attr
= PTHREAD_STACK_INITIAL
;
238 /* Setup the context for the scheduler: */
239 _setjmp(_thread_kern_sched_jb
);
240 SET_STACK_JB(_thread_kern_sched_jb
, _thread_kern_sched_stack
+
241 SCHED_STACK_SIZE
- sizeof(double));
242 SET_RETURN_ADDR_JB(_thread_kern_sched_jb
, _thread_kern_scheduler
);
245 * Write a magic value to the thread structure
246 * to help identify valid ones:
248 _thread_initial
->magic
= PTHREAD_MAGIC
;
250 /* Set the initial cancel state */
251 _thread_initial
->cancelflags
= PTHREAD_CANCEL_ENABLE
|
252 PTHREAD_CANCEL_DEFERRED
;
254 /* Default the priority of the initial thread: */
255 _thread_initial
->base_priority
= PTHREAD_DEFAULT_PRIORITY
;
256 _thread_initial
->active_priority
= PTHREAD_DEFAULT_PRIORITY
;
257 _thread_initial
->inherited_priority
= 0;
259 /* Initialise the state of the initial thread: */
260 _thread_initial
->state
= PS_RUNNING
;
262 /* Set the name of the thread: */
263 _thread_initial
->name
= strdup("_thread_initial");
265 /* Initialize joiner to NULL (no joiner): */
266 _thread_initial
->joiner
= NULL
;
268 /* Initialize the owned mutex queue and count: */
269 TAILQ_INIT(&(_thread_initial
->mutexq
));
270 _thread_initial
->priority_mutex_count
= 0;
272 /* Initialize the global scheduling time: */
274 gettimeofday((struct timeval
*) &_sched_tod
, NULL
);
276 /* Initialize last active: */
277 _thread_initial
->last_active
= (long) _sched_ticks
;
279 /* Initialize the initial context: */
280 _thread_initial
->curframe
= NULL
;
282 /* Initialise the rest of the fields: */
283 _thread_initial
->poll_data
.nfds
= 0;
284 _thread_initial
->poll_data
.fds
= NULL
;
285 _thread_initial
->sig_defer_count
= 0;
286 _thread_initial
->yield_on_sig_undefer
= 0;
287 _thread_initial
->specific_data
= NULL
;
288 _thread_initial
->cleanup
= NULL
;
289 _thread_initial
->flags
= 0;
290 TAILQ_INIT(&_thread_list
);
291 TAILQ_INSERT_HEAD(&_thread_list
, _thread_initial
, tle
);
292 _set_curthread(_thread_initial
);
293 TAILQ_INIT(&_atfork_list
);
294 _pthread_mutex_init(&_atfork_mutex
, NULL
);
296 /* Initialise the global signal action structure: */
297 sigfillset(&act
.sa_mask
);
298 act
.sa_handler
= (void (*) ()) _thread_sig_handler
;
299 act
.sa_flags
= SA_SIGINFO
| SA_RESTART
;
301 /* Clear pending signals for the process: */
302 sigemptyset(&_process_sigpending
);
304 /* Clear the signal queue: */
305 memset(_thread_sigq
, 0, sizeof(_thread_sigq
));
307 /* Enter a loop to get the existing signal status: */
308 for (i
= 1; i
< NSIG
; i
++) {
309 /* Check for signals which cannot be trapped: */
310 if (i
== SIGKILL
|| i
== SIGSTOP
) {
313 /* Get the signal handler details: */
314 else if (__sys_sigaction(i
, NULL
,
315 &_thread_sigact
[i
- 1]) != 0) {
317 * Abort this process if signal
318 * initialisation fails:
320 PANIC("Cannot read signal handler info");
323 /* Initialize the SIG_DFL dummy handler count. */
324 _thread_dfl_count
[i
] = 0;
328 * Install the signal handler for the most important
329 * signals that the user-thread kernel needs. Actually
330 * SIGINFO isn't really needed, but it is nice to have.
332 if (__sys_sigaction(_SCHED_SIGNAL
, &act
, NULL
) != 0 ||
333 __sys_sigaction(SIGINFO
, &act
, NULL
) != 0 ||
334 __sys_sigaction(SIGCHLD
, &act
, NULL
) != 0) {
336 * Abort this process if signal initialisation fails:
338 PANIC("Cannot initialise signal handler");
340 _thread_sigact
[_SCHED_SIGNAL
- 1].sa_flags
= SA_SIGINFO
;
341 _thread_sigact
[SIGINFO
- 1].sa_flags
= SA_SIGINFO
;
342 _thread_sigact
[SIGCHLD
- 1].sa_flags
= SA_SIGINFO
;
344 /* Get the process signal mask: */
345 __sys_sigprocmask(SIG_SETMASK
, NULL
, &_process_sigmask
);
347 /* Get the kernel clockrate: */
349 mib
[1] = KERN_CLOCKRATE
;
350 len
= sizeof (struct clockinfo
);
351 if (sysctl(mib
, 2, &clockinfo
, &len
, NULL
, 0) == 0)
352 _clock_res_usec
= clockinfo
.tick
> CLOCK_RES_USEC_MIN
?
353 clockinfo
.tick
: CLOCK_RES_USEC_MIN
;
355 /* Get the table size: */
356 if ((_thread_dtablesize
= getdtablesize()) < 0) {
358 * Cannot get the system defined table size, so abort
361 PANIC("Cannot get dtablesize");
363 /* Allocate memory for the file descriptor table: */
364 if ((_thread_fd_table
= (struct fd_table_entry
**) malloc(sizeof(struct fd_table_entry
*) * _thread_dtablesize
)) == NULL
) {
365 /* Avoid accesses to file descriptor table on exit: */
366 _thread_dtablesize
= 0;
369 * Cannot allocate memory for the file descriptor
370 * table, so abort this process.
372 PANIC("Cannot allocate memory for file descriptor table");
374 /* Allocate memory for the pollfd table: */
375 if ((_thread_pfd_table
= (struct pollfd
*) malloc(sizeof(struct pollfd
) * _thread_dtablesize
)) == NULL
) {
377 * Cannot allocate memory for the file descriptor
378 * table, so abort this process.
380 PANIC("Cannot allocate memory for pollfd table");
383 * Enter a loop to initialise the file descriptor
386 for (i
= 0; i
< _thread_dtablesize
; i
++) {
387 /* Initialise the file descriptor table: */
388 _thread_fd_table
[i
] = NULL
;
391 /* Initialize stdio file descriptor table entries: */
392 for (i
= 0; i
< 3; i
++) {
393 if ((_thread_fd_table_init(i
) != 0) &&
395 PANIC("Cannot initialize stdio file "
396 "descriptor table entry");
401 #ifdef GCC_2_8_MADE_THREAD_AWARE
402 /* Create the thread-specific data for the exception linked list. */
403 if(pthread_key_create(&except_head_key
, NULL
) != 0)
404 PANIC("Failed to create thread specific execption head");
406 /* Setup the gcc exception handler per thread. */
407 __set_dynamic_handler_allocator( dynamic_allocator_handler_fn
);
408 #endif /* GCC_2_8_MADE_THREAD_AWARE */
410 /* Initialise the garbage collector mutex and condition variable. */
411 if (pthread_mutex_init(&_gc_mutex
,NULL
) != 0 ||
412 pthread_cond_init(&_gc_cond
,NULL
) != 0)
413 PANIC("Failed to initialise garbage collector mutex or condvar");
416 int _thread_autoinit_dummy_decl
= 0;
420 _thread_mksigpipe(void)
425 * Create a pipe that is written to by the signal handler to
426 * prevent signals being missed in calls to
429 if (__sys_pipe(_thread_kern_pipe
) != 0) {
430 /* Cannot create pipe, so abort: */
431 PANIC("Cannot create pthread kernel pipe.");
434 * Make sure the pipe does not get in the way of stdio:
436 for (i
= 0; i
< 2; i
++) {
437 if (_thread_kern_pipe
[i
] < 3) {
438 fd
= __sys_fcntl(_thread_kern_pipe
[i
], F_DUPFD
, 3);
440 PANIC("Cannot create kernel pipe");
441 __sys_close(_thread_kern_pipe
[i
]);
442 _thread_kern_pipe
[i
] = fd
;
445 /* Get the flags for the read pipe: */
446 if ((flags
= __sys_fcntl(_thread_kern_pipe
[0], F_GETFL
, NULL
)) == -1)
448 /* Make the read pipe non-blocking: */
449 if (__sys_fcntl(_thread_kern_pipe
[0], F_SETFL
, flags
| O_NONBLOCK
) == -1)
451 /* Get the flags for the write pipe: */
452 if ((flags
= __sys_fcntl(_thread_kern_pipe
[1], F_GETFL
, NULL
)) == -1)
454 /* Make the write pipe non-blocking: */
455 if (__sys_fcntl(_thread_kern_pipe
[1], F_SETFL
, flags
| O_NONBLOCK
) == -1)