2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
3 * Copyright (c) 2003 Daniel M. Eischen <deischen@gdeb.com>
4 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by John Birrell.
18 * 4. Neither the name of the author nor the names of any co-contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $FreeBSD: src/lib/libpthread/thread/thr_create.c,v 1.58 2004/10/23 23:28:36 davidxu Exp $
35 * $DragonFly: src/lib/libthread_xu/thread/thr_create.c,v 1.1 2005/02/01 12:38:27 davidxu Exp $
44 #include <machine/reg.h>
46 #include <sys/signalvar.h>
48 #include "thr_private.h"
49 #include "libc_private.h"
52 struct pthread *thread;
53 volatile umtx_t started;
56 static void free_thread(struct pthread *curthread, struct pthread *thread);
57 static int create_stack(struct pthread_attr *pattr);
58 static void free_stack(struct pthread *curthread, struct pthread_attr *pattr);
59 static void thread_start(void *);
61 __weak_reference(_pthread_create, pthread_create);
64 _pthread_create(pthread_t * thread, const pthread_attr_t * attr,
65 void *(*start_routine) (void *), void *arg)
67 struct start_arg start_arg;
69 sigset_t sigmask, oldsigmask;
70 struct pthread *curthread, *new_thread;
76 * Tell libc and others now they need lock to protect their data.
78 if (_thr_isthreaded() == 0 && _thr_setthreaded(1))
81 curthread = _get_curthread();
82 if ((new_thread = _thr_alloc(curthread)) == NULL)
85 if (attr == NULL || *attr == NULL)
86 /* Use the default thread attributes: */
87 new_thread->attr = _pthread_attr_default;
89 new_thread->attr = *(*attr);
90 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) {
91 /* inherit scheduling contention scope */
92 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
93 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM;
95 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM;
97 * scheduling policy and scheduling parameters will be
98 * inherited in following code.
102 if (_thread_scope_system > 0)
103 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM;
104 else if (_thread_scope_system < 0)
105 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM;
107 if (create_stack(&new_thread->attr) != 0) {
108 /* Insufficient memory to create a stack: */
109 new_thread->terminated = 1;
110 _thr_free(curthread, new_thread);
114 * Write a magic value to the thread structure
115 * to help identify valid ones:
117 new_thread->magic = THR_MAGIC;
118 new_thread->start_routine = start_routine;
119 new_thread->arg = arg;
120 new_thread->cancelflags = PTHREAD_CANCEL_ENABLE |
121 PTHREAD_CANCEL_DEFERRED;
123 * Check if this thread is to inherit the scheduling
124 * attributes from its parent:
126 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) {
128 * Copy the scheduling attributes. Lock the scheduling
129 * lock to get consistent scheduling parameters.
132 new_thread->base_priority = curthread->base_priority;
133 new_thread->attr.prio = curthread->base_priority;
134 new_thread->attr.sched_policy = curthread->attr.sched_policy;
135 THR_UNLOCK(curthread);
138 * Use just the thread priority, leaving the
139 * other scheduling attributes as their
142 new_thread->base_priority = new_thread->attr.prio;
144 new_thread->active_priority = new_thread->base_priority;
146 /* Initialize the mutex queue: */
147 TAILQ_INIT(&new_thread->mutexq);
148 TAILQ_INIT(&new_thread->pri_mutexq);
150 /* Initialise hooks in the thread structure: */
151 if (new_thread->attr.suspend == THR_CREATE_SUSPENDED)
152 new_thread->flags = THR_FLAGS_SUSPENDED;
153 new_thread->state = PS_RUNNING;
155 * Thread created by thr_create() inherits currrent thread
156 * sigmask, however, before new thread setup itself correctly,
157 * it can not handle signal, so we should masks all signals here.
160 __sys_sigprocmask(SIG_SETMASK, &sigmask, &oldsigmask);
161 new_thread->sigmask = oldsigmask;
162 /* Add the new thread. */
163 _thr_link(curthread, new_thread);
164 /* Return thread pointer eariler so that new thread can use it. */
165 (*thread) = new_thread;
166 /* Schedule the new thread. */
167 stack = (char *)new_thread->attr.stackaddr_attr +
168 new_thread->attr.stacksize_attr;
169 start_arg.thread = new_thread;
170 start_arg.started = 0;
171 ret = rfork_thread(RFPROC | RFNOWAIT | RFMEM | RFSIGSHARE, stack,
172 (int (*)(void *))thread_start, &start_arg);
173 __sys_sigprocmask(SIG_SETMASK, &oldsigmask, NULL);
176 * Wait until new thread get its thread id, so we can
177 * send signal to it immediately after we return.
179 while (start_arg.started == 0)
180 _thr_umtx_wait(&start_arg.started, 0, 0);
186 _thr_unlink(curthread, new_thread);
187 free_thread(curthread, new_thread);
195 free_thread(struct pthread *curthread, struct pthread *thread)
197 free_stack(curthread, &thread->attr);
198 curthread->terminated = 1;
199 _thr_free(curthread, thread);
203 create_stack(struct pthread_attr *pattr)
207 /* Check if a stack was specified in the thread attributes: */
208 if ((pattr->stackaddr_attr) != NULL) {
209 pattr->guardsize_attr = 0;
210 pattr->flags |= THR_STACK_USER;
214 ret = _thr_stack_alloc(pattr);
219 free_stack(struct pthread *curthread, struct pthread_attr *pattr)
221 if ((pattr->flags & THR_STACK_USER) == 0) {
222 THREAD_LIST_LOCK(curthread);
223 /* Stack routines don't use malloc/free. */
224 _thr_stack_free(pattr);
225 THREAD_LIST_UNLOCK(curthread);
230 thread_start(void *arg)
232 struct pthread *curthread;
233 struct start_arg *start_arg = arg;
235 curthread = start_arg->thread;
236 curthread->tid = _thr_get_tid();
237 _tcb_set(curthread->tcb);
238 start_arg->started = 1;
239 _thr_umtx_wake(&start_arg->started, 1);
241 /* Thread was created with all signals blocked, unblock them. */
242 __sys_sigprocmask(SIG_SETMASK, &curthread->sigmask, NULL);
244 if (curthread->flags & THR_FLAGS_NEED_SUSPEND)
245 _thr_suspend_check(curthread);
247 /* Run the current thread's start routine with argument: */
248 pthread_exit(curthread->start_routine(curthread->arg));
250 /* This point should never be reached. */
251 PANIC("Thread has resumed after exit");