2 * Copyright (c) 2003 Daniel M. Eischen <deischen@freebsd.org>
3 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by John Birrell.
17 * 4. Neither the name of the author nor the names of any co-contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include "namespace.h"
37 #include <sys/types.h>
38 #include <sys/signalvar.h>
39 #include <sys/ioctl.h>
40 #include <sys/sysctl.h>
41 #include <sys/ttycom.h>
43 #include <sys/rtprio.h>
48 #include <pthread_np.h>
54 #include "un-namespace.h"
56 #include "libc_private.h"
57 #include "thr_private.h"
60 struct pthread *_thr_initial;
62 int _thread_event_mask;
63 struct pthread *_thread_last_event;
64 pthreadlist _thread_list = TAILQ_HEAD_INITIALIZER(_thread_list);
65 pthreadlist _thread_gc_list = TAILQ_HEAD_INITIALIZER(_thread_gc_list);
66 int _thread_active_threads = 1;
67 atfork_head _thr_atfork_list = TAILQ_HEAD_INITIALIZER(_thr_atfork_list);
68 struct umutex _thr_atfork_lock = DEFAULT_UMUTEX;
70 struct pthread_prio _thr_priorities[3] = {
71 {RTP_PRIO_MIN, RTP_PRIO_MAX, 0}, /* FIFO */
72 {0, 0, 63}, /* OTHER */
73 {RTP_PRIO_MIN, RTP_PRIO_MAX, 0} /* RR */
76 struct pthread_attr _pthread_attr_default = {
77 .sched_policy = SCHED_OTHER,
78 .sched_inherit = PTHREAD_INHERIT_SCHED,
80 .suspend = THR_CREATE_RUNNING,
81 .flags = PTHREAD_SCOPE_SYSTEM,
82 .stackaddr_attr = NULL,
83 .stacksize_attr = THR_STACK_DEFAULT,
89 struct pthread_mutex_attr _pthread_mutexattr_default = {
90 .m_type = PTHREAD_MUTEX_DEFAULT,
91 .m_protocol = PTHREAD_PRIO_NONE,
95 /* Default condition variable attributes: */
96 struct pthread_cond_attr _pthread_condattr_default = {
97 .c_pshared = PTHREAD_PROCESS_PRIVATE,
98 .c_clockid = CLOCK_REALTIME
103 size_t _thr_guard_default;
104 size_t _thr_stack_default = THR_STACK_DEFAULT;
105 size_t _thr_stack_initial = THR_STACK_INITIAL;
110 struct umutex _mutex_static_lock = DEFAULT_UMUTEX;
111 struct umutex _cond_static_lock = DEFAULT_UMUTEX;
112 struct umutex _rwlock_static_lock = DEFAULT_UMUTEX;
113 struct umutex _keytable_lock = DEFAULT_UMUTEX;
114 struct umutex _thr_list_lock = DEFAULT_UMUTEX;
115 struct umutex _thr_event_lock = DEFAULT_UMUTEX;
117 int __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
118 int __pthread_mutex_lock(pthread_mutex_t *);
119 int __pthread_mutex_trylock(pthread_mutex_t *);
120 void _thread_init_hack(void) __attribute__ ((constructor));
122 static void init_private(void);
123 static void init_main_thread(struct pthread *thread);
126 * All weak references used within libc should be in this table.
127 * This is so that static libraries will work.
130 STATIC_LIB_REQUIRE(_fork);
131 STATIC_LIB_REQUIRE(_pthread_getspecific);
132 STATIC_LIB_REQUIRE(_pthread_key_create);
133 STATIC_LIB_REQUIRE(_pthread_key_delete);
134 STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
135 STATIC_LIB_REQUIRE(_pthread_mutex_init);
136 STATIC_LIB_REQUIRE(_pthread_mutex_lock);
137 STATIC_LIB_REQUIRE(_pthread_mutex_trylock);
138 STATIC_LIB_REQUIRE(_pthread_mutex_unlock);
139 STATIC_LIB_REQUIRE(_pthread_mutexattr_init);
140 STATIC_LIB_REQUIRE(_pthread_mutexattr_destroy);
141 STATIC_LIB_REQUIRE(_pthread_mutexattr_settype);
142 STATIC_LIB_REQUIRE(_pthread_once);
143 STATIC_LIB_REQUIRE(_pthread_setspecific);
144 STATIC_LIB_REQUIRE(_raise);
145 STATIC_LIB_REQUIRE(_sem_destroy);
146 STATIC_LIB_REQUIRE(_sem_getvalue);
147 STATIC_LIB_REQUIRE(_sem_init);
148 STATIC_LIB_REQUIRE(_sem_post);
149 STATIC_LIB_REQUIRE(_sem_timedwait);
150 STATIC_LIB_REQUIRE(_sem_trywait);
151 STATIC_LIB_REQUIRE(_sem_wait);
152 STATIC_LIB_REQUIRE(_sigaction);
153 STATIC_LIB_REQUIRE(_sigprocmask);
154 STATIC_LIB_REQUIRE(_sigsuspend);
155 STATIC_LIB_REQUIRE(_sigtimedwait);
156 STATIC_LIB_REQUIRE(_sigwait);
157 STATIC_LIB_REQUIRE(_sigwaitinfo);
158 STATIC_LIB_REQUIRE(_spinlock);
159 STATIC_LIB_REQUIRE(_spinlock_debug);
160 STATIC_LIB_REQUIRE(_spinunlock);
161 STATIC_LIB_REQUIRE(_thread_init_hack);
164 * These are needed when linking statically. All references within
165 * libgcc (and in the future libc) to these routines are weak, but
166 * if they are not (strongly) referenced by the application or other
167 * libraries, then the actual functions will not be loaded.
169 STATIC_LIB_REQUIRE(_pthread_once);
170 STATIC_LIB_REQUIRE(_pthread_key_create);
171 STATIC_LIB_REQUIRE(_pthread_key_delete);
172 STATIC_LIB_REQUIRE(_pthread_getspecific);
173 STATIC_LIB_REQUIRE(_pthread_setspecific);
174 STATIC_LIB_REQUIRE(_pthread_mutex_init);
175 STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
176 STATIC_LIB_REQUIRE(_pthread_mutex_lock);
177 STATIC_LIB_REQUIRE(_pthread_mutex_trylock);
178 STATIC_LIB_REQUIRE(_pthread_mutex_unlock);
179 STATIC_LIB_REQUIRE(_pthread_create);
181 /* Pull in all symbols required by libthread_db */
182 STATIC_LIB_REQUIRE(_thread_state_running);
184 #define DUAL_ENTRY(entry) \
185 (pthread_func_t)entry, (pthread_func_t)entry
187 static pthread_func_t jmp_table[][2] = {
188 {DUAL_ENTRY(_pthread_atfork)}, /* PJT_ATFORK */
189 {DUAL_ENTRY(_pthread_attr_destroy)}, /* PJT_ATTR_DESTROY */
190 {DUAL_ENTRY(_pthread_attr_getdetachstate)}, /* PJT_ATTR_GETDETACHSTATE */
191 {DUAL_ENTRY(_pthread_attr_getguardsize)}, /* PJT_ATTR_GETGUARDSIZE */
192 {DUAL_ENTRY(_pthread_attr_getinheritsched)}, /* PJT_ATTR_GETINHERITSCHED */
193 {DUAL_ENTRY(_pthread_attr_getschedparam)}, /* PJT_ATTR_GETSCHEDPARAM */
194 {DUAL_ENTRY(_pthread_attr_getschedpolicy)}, /* PJT_ATTR_GETSCHEDPOLICY */
195 {DUAL_ENTRY(_pthread_attr_getscope)}, /* PJT_ATTR_GETSCOPE */
196 {DUAL_ENTRY(_pthread_attr_getstackaddr)}, /* PJT_ATTR_GETSTACKADDR */
197 {DUAL_ENTRY(_pthread_attr_getstacksize)}, /* PJT_ATTR_GETSTACKSIZE */
198 {DUAL_ENTRY(_pthread_attr_init)}, /* PJT_ATTR_INIT */
199 {DUAL_ENTRY(_pthread_attr_setdetachstate)}, /* PJT_ATTR_SETDETACHSTATE */
200 {DUAL_ENTRY(_pthread_attr_setguardsize)}, /* PJT_ATTR_SETGUARDSIZE */
201 {DUAL_ENTRY(_pthread_attr_setinheritsched)}, /* PJT_ATTR_SETINHERITSCHED */
202 {DUAL_ENTRY(_pthread_attr_setschedparam)}, /* PJT_ATTR_SETSCHEDPARAM */
203 {DUAL_ENTRY(_pthread_attr_setschedpolicy)}, /* PJT_ATTR_SETSCHEDPOLICY */
204 {DUAL_ENTRY(_pthread_attr_setscope)}, /* PJT_ATTR_SETSCOPE */
205 {DUAL_ENTRY(_pthread_attr_setstackaddr)}, /* PJT_ATTR_SETSTACKADDR */
206 {DUAL_ENTRY(_pthread_attr_setstacksize)}, /* PJT_ATTR_SETSTACKSIZE */
207 {DUAL_ENTRY(_pthread_cancel)}, /* PJT_CANCEL */
208 {DUAL_ENTRY(_pthread_cleanup_pop)}, /* PJT_CLEANUP_POP */
209 {DUAL_ENTRY(_pthread_cleanup_push)}, /* PJT_CLEANUP_PUSH */
210 {DUAL_ENTRY(_pthread_cond_broadcast)}, /* PJT_COND_BROADCAST */
211 {DUAL_ENTRY(_pthread_cond_destroy)}, /* PJT_COND_DESTROY */
212 {DUAL_ENTRY(_pthread_cond_init)}, /* PJT_COND_INIT */
213 {DUAL_ENTRY(_pthread_cond_signal)}, /* PJT_COND_SIGNAL */
214 {DUAL_ENTRY(_pthread_cond_timedwait)}, /* PJT_COND_TIMEDWAIT */
215 {(pthread_func_t)__pthread_cond_wait,
216 (pthread_func_t)_pthread_cond_wait}, /* PJT_COND_WAIT */
217 {DUAL_ENTRY(_pthread_detach)}, /* PJT_DETACH */
218 {DUAL_ENTRY(_pthread_equal)}, /* PJT_EQUAL */
219 {DUAL_ENTRY(_pthread_exit)}, /* PJT_EXIT */
220 {DUAL_ENTRY(_pthread_getspecific)}, /* PJT_GETSPECIFIC */
221 {DUAL_ENTRY(_pthread_join)}, /* PJT_JOIN */
222 {DUAL_ENTRY(_pthread_key_create)}, /* PJT_KEY_CREATE */
223 {DUAL_ENTRY(_pthread_key_delete)}, /* PJT_KEY_DELETE*/
224 {DUAL_ENTRY(_pthread_kill)}, /* PJT_KILL */
225 {DUAL_ENTRY(_pthread_main_np)}, /* PJT_MAIN_NP */
226 {DUAL_ENTRY(_pthread_mutexattr_destroy)}, /* PJT_MUTEXATTR_DESTROY */
227 {DUAL_ENTRY(_pthread_mutexattr_init)}, /* PJT_MUTEXATTR_INIT */
228 {DUAL_ENTRY(_pthread_mutexattr_settype)}, /* PJT_MUTEXATTR_SETTYPE */
229 {DUAL_ENTRY(_pthread_mutex_destroy)}, /* PJT_MUTEX_DESTROY */
230 {DUAL_ENTRY(_pthread_mutex_init)}, /* PJT_MUTEX_INIT */
231 {(pthread_func_t)__pthread_mutex_lock,
232 (pthread_func_t)_pthread_mutex_lock}, /* PJT_MUTEX_LOCK */
233 {(pthread_func_t)__pthread_mutex_trylock,
234 (pthread_func_t)_pthread_mutex_trylock},/* PJT_MUTEX_TRYLOCK */
235 {DUAL_ENTRY(_pthread_mutex_unlock)}, /* PJT_MUTEX_UNLOCK */
236 {DUAL_ENTRY(_pthread_once)}, /* PJT_ONCE */
237 {DUAL_ENTRY(_pthread_rwlock_destroy)}, /* PJT_RWLOCK_DESTROY */
238 {DUAL_ENTRY(_pthread_rwlock_init)}, /* PJT_RWLOCK_INIT */
239 {DUAL_ENTRY(_pthread_rwlock_rdlock)}, /* PJT_RWLOCK_RDLOCK */
240 {DUAL_ENTRY(_pthread_rwlock_tryrdlock)},/* PJT_RWLOCK_TRYRDLOCK */
241 {DUAL_ENTRY(_pthread_rwlock_trywrlock)},/* PJT_RWLOCK_TRYWRLOCK */
242 {DUAL_ENTRY(_pthread_rwlock_unlock)}, /* PJT_RWLOCK_UNLOCK */
243 {DUAL_ENTRY(_pthread_rwlock_wrlock)}, /* PJT_RWLOCK_WRLOCK */
244 {DUAL_ENTRY(_pthread_self)}, /* PJT_SELF */
245 {DUAL_ENTRY(_pthread_setcancelstate)}, /* PJT_SETCANCELSTATE */
246 {DUAL_ENTRY(_pthread_setcanceltype)}, /* PJT_SETCANCELTYPE */
247 {DUAL_ENTRY(_pthread_setspecific)}, /* PJT_SETSPECIFIC */
248 {DUAL_ENTRY(_pthread_sigmask)}, /* PJT_SIGMASK */
249 {DUAL_ENTRY(_pthread_testcancel)} /* PJT_TESTCANCEL */
252 static int init_once = 0;
255 * For the shared version of the threads library, the above is sufficient.
256 * But for the archive version of the library, we need a little bit more.
257 * Namely, we must arrange for this particular module to be pulled in from
258 * the archive library at link time. To accomplish that, we define and
259 * initialize a variable, "_thread_autoinit_dummy_decl". This variable is
260 * referenced (as an extern) from libc/stdlib/exit.c. This will always
261 * create a need for this module, ensuring that it is present in the
264 extern int _thread_autoinit_dummy_decl;
265 int _thread_autoinit_dummy_decl = 0;
268 _thread_init_hack(void)
271 _libpthread_init(NULL);
276 * Threaded process initialization.
278 * This is only called under two conditions:
280 * 1) Some thread routines have detected that the library hasn't yet
281 * been initialized (_thr_initial == NULL && curthread == NULL), or
283 * 2) An explicit call to reinitialize after a fork (indicated
284 * by curthread != NULL)
287 _libpthread_init(struct pthread *curthread)
290 sigset_t sigset, oldset;
292 /* Check if this function has already been called: */
293 if ((_thr_initial != NULL) && (curthread == NULL))
294 /* Only initialize the threaded application once. */
298 * Check the size of the jump table to make sure it is preset
299 * with the correct number of entries.
301 if (sizeof(jmp_table) != (sizeof(pthread_func_t) * PJT_MAX * 2))
302 PANIC("Thread jump table not properly initialized");
303 memcpy(__thr_jtable, jmp_table, sizeof(jmp_table));
306 * Check for the special case of this process running as
307 * or in place of init as pid = 1:
309 if ((_thr_pid = getpid()) == 1) {
311 * Setup a new session for this process which is
312 * assumed to be running as root.
315 PANIC("Can't set session ID");
316 if (revoke(_PATH_CONSOLE) != 0)
317 PANIC("Can't revoke console");
318 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
319 PANIC("Can't open console");
320 if (setlogin("root") == -1)
321 PANIC("Can't set login to root");
322 if (_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1)
323 PANIC("Can't set controlling terminal");
326 /* Initialize pthread private data. */
329 /* Set the initial thread. */
330 if (curthread == NULL) {
332 /* Create and initialize the initial thread. */
333 curthread = _thr_alloc(NULL);
334 if (curthread == NULL)
335 PANIC("Can't allocate initial thread");
336 init_main_thread(curthread);
339 * Add the thread to the thread list queue.
341 THR_LIST_ADD(curthread);
342 _thread_active_threads = 1;
344 /* Setup the thread specific data */
345 _tcb_set(curthread->tcb);
349 SIGDELSET(sigset, SIGTRAP);
350 __sys_sigprocmask(SIG_SETMASK, &sigset, &oldset);
352 _thr_initial = curthread;
353 SIGDELSET(oldset, SIGCANCEL);
354 __sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
355 if (_thread_event_mask & TD_CREATE)
356 _thr_report_creation(curthread, curthread);
361 * This function and pthread_create() do a lot of the same things.
362 * It'd be nice to consolidate the common stuff in one place.
365 init_main_thread(struct pthread *thread)
367 struct sched_param sched_param;
369 /* Setup the thread attributes. */
370 thr_self(&thread->tid);
371 thread->attr = _pthread_attr_default;
373 * Set up the thread stack.
375 * Create a red zone below the main stack. All other stacks
376 * are constrained to a maximum size by the parameters
377 * passed to mmap(), but this stack is only limited by
378 * resource limits, so this stack needs an explicitly mapped
379 * red zone to protect the thread stack that is just beyond.
381 if (mmap(_usrstack - _thr_stack_initial -
382 _thr_guard_default, _thr_guard_default, 0, MAP_ANON,
383 -1, 0) == MAP_FAILED)
384 PANIC("Cannot allocate red zone for initial thread");
387 * Mark the stack as an application supplied stack so that it
390 * XXX - I'm not sure it would hurt anything to deallocate
391 * the main thread stack because deallocation doesn't
392 * actually free() it; it just puts it in the free
393 * stack queue for later reuse.
395 thread->attr.stackaddr_attr = _usrstack - _thr_stack_initial;
396 thread->attr.stacksize_attr = _thr_stack_initial;
397 thread->attr.guardsize_attr = _thr_guard_default;
398 thread->attr.flags |= THR_STACK_USER;
401 * Write a magic value to the thread structure
402 * to help identify valid ones:
404 thread->magic = THR_MAGIC;
406 thread->cancel_enable = 1;
407 thread->cancel_async = 0;
408 thr_set_name(thread->tid, "initial thread");
410 /* Initialize the mutex queue: */
411 TAILQ_INIT(&thread->mutexq);
412 TAILQ_INIT(&thread->pp_mutexq);
414 thread->state = PS_RUNNING;
416 _thr_getscheduler(thread->tid, &thread->attr.sched_policy,
418 thread->attr.prio = sched_param.sched_priority;
420 /* Others cleared to zero by thr_alloc() */
430 _thr_umutex_init(&_mutex_static_lock);
431 _thr_umutex_init(&_cond_static_lock);
432 _thr_umutex_init(&_rwlock_static_lock);
433 _thr_umutex_init(&_keytable_lock);
434 _thr_umutex_init(&_thr_atfork_lock);
435 _thr_umutex_init(&_thr_event_lock);
437 _thr_spinlock_init();
441 * Avoid reinitializing some things if they don't need to be,
442 * e.g. after a fork().
444 if (init_once == 0) {
445 /* Find the stack top */
447 mib[1] = KERN_USRSTACK;
448 len = sizeof (_usrstack);
449 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1)
450 PANIC("Cannot get kern.usrstack from sysctl");
451 len = sizeof(_thr_is_smp);
452 sysctlbyname("kern.smp.cpus", &_thr_is_smp, &len, NULL, 0);
453 _thr_is_smp = (_thr_is_smp > 1);
454 _thr_page_size = getpagesize();
455 _thr_guard_default = _thr_page_size;
456 _pthread_attr_default.guardsize_attr = _thr_guard_default;
457 _pthread_attr_default.stacksize_attr = _thr_stack_default;
458 env = getenv("LIBPTHREAD_SPINLOOPS");
460 _thr_spinloops = atoi(env);
461 env = getenv("LIBPTHREAD_YIELDLOOPS");
463 _thr_yieldloops = atoi(env);
464 TAILQ_INIT(&_thr_atfork_list);