2 * Copyright (c) 2003 Daniel M. Eischen <deischen@gdeb.com>
3 * Copyright (c) 2005, David Xu <davidxu@freebsd.org>
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 unmodified, this list of conditions, and the following
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.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include "namespace.h"
31 #include <sys/types.h>
32 #include <sys/rtprio.h>
33 #include <sys/signalvar.h>
40 #include <pthread_np.h>
41 #include "un-namespace.h"
43 #include "libc_private.h"
44 #include "thr_private.h"
46 static int create_stack(struct pthread_attr *pattr);
47 static void thread_start(struct pthread *curthread);
49 __weak_reference(_pthread_create, pthread_create);
52 _pthread_create(pthread_t * thread, const pthread_attr_t * attr,
53 void *(*start_routine) (void *), void *arg)
55 struct pthread *curthread, *new_thread;
56 struct thr_param param;
57 struct sched_param sched_param;
59 int ret = 0, locked, create_suspended;
61 cpuset_t *cpusetp = NULL;
68 * Tell libc and others now they need lock to protect their data.
70 if (_thr_isthreaded() == 0) {
71 _malloc_first_thread();
72 if (_thr_setthreaded(1))
76 curthread = _get_curthread();
77 if ((new_thread = _thr_alloc(curthread)) == NULL)
80 memset(¶m, 0, sizeof(param));
82 if (attr == NULL || *attr == NULL)
83 /* Use the default thread attributes: */
84 new_thread->attr = _pthread_attr_default;
86 new_thread->attr = *(*attr);
87 cpusetp = new_thread->attr.cpuset;
88 cpusetsize = new_thread->attr.cpusetsize;
89 new_thread->attr.cpuset = NULL;
90 new_thread->attr.cpusetsize = 0;
92 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) {
93 /* inherit scheduling contention scope */
94 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
95 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM;
97 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM;
99 new_thread->attr.prio = curthread->attr.prio;
100 new_thread->attr.sched_policy = curthread->attr.sched_policy;
103 new_thread->tid = TID_TERMINATED;
105 old_stack_prot = _rtld_get_stack_prot();
106 if (create_stack(&new_thread->attr) != 0) {
107 /* Insufficient memory to create a stack: */
108 _thr_free(curthread, new_thread);
112 * Write a magic value to the thread structure
113 * to help identify valid ones:
115 new_thread->magic = THR_MAGIC;
116 new_thread->start_routine = start_routine;
117 new_thread->arg = arg;
118 new_thread->cancel_enable = 1;
119 new_thread->cancel_async = 0;
120 /* Initialize the mutex queue: */
121 TAILQ_INIT(&new_thread->mutexq);
122 TAILQ_INIT(&new_thread->pp_mutexq);
124 /* Initialise hooks in the thread structure: */
125 if (new_thread->attr.suspend == THR_CREATE_SUSPENDED) {
126 new_thread->flags = THR_FLAGS_NEED_SUSPEND;
127 create_suspended = 1;
129 create_suspended = 0;
132 new_thread->state = PS_RUNNING;
134 if (new_thread->attr.flags & PTHREAD_CREATE_DETACHED)
135 new_thread->flags |= THR_FLAGS_DETACHED;
137 /* Add the new thread. */
138 new_thread->refcount = 1;
139 _thr_link(curthread, new_thread);
142 * Handle the race between __pthread_map_stacks_exec and
145 if (old_stack_prot != _rtld_get_stack_prot())
146 _thr_stack_fix_protection(new_thread);
148 /* Return thread pointer eariler so that new thread can use it. */
149 (*thread) = new_thread;
150 if (SHOULD_REPORT_EVENT(curthread, TD_CREATE) || cpusetp != NULL) {
151 THR_THREAD_LOCK(curthread, new_thread);
155 param.start_func = (void (*)(void *)) thread_start;
156 param.arg = new_thread;
157 param.stack_base = new_thread->attr.stackaddr_attr;
158 param.stack_size = new_thread->attr.stacksize_attr;
159 param.tls_base = (char *)new_thread->tcb;
160 param.tls_size = sizeof(struct tcb);
161 param.child_tid = &new_thread->tid;
162 param.parent_tid = &new_thread->tid;
164 if (new_thread->attr.flags & PTHREAD_SCOPE_SYSTEM)
165 param.flags |= THR_SYSTEM_SCOPE;
166 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED)
169 sched_param.sched_priority = new_thread->attr.prio;
170 _schedparam_to_rtp(new_thread->attr.sched_policy,
175 /* Schedule the new thread. */
176 if (create_suspended) {
178 SIGDELSET(set, SIGTRAP);
179 __sys_sigprocmask(SIG_SETMASK, &set, &oset);
180 new_thread->sigmask = oset;
181 SIGDELSET(new_thread->sigmask, SIGCANCEL);
184 ret = thr_new(¶m, sizeof(param));
189 * Translate EPROCLIM into well-known POSIX code EAGAIN.
195 if (create_suspended)
196 __sys_sigprocmask(SIG_SETMASK, &oset, NULL);
200 THR_THREAD_LOCK(curthread, new_thread);
201 new_thread->state = PS_DEAD;
202 new_thread->tid = TID_TERMINATED;
203 new_thread->flags |= THR_FLAGS_DETACHED;
204 new_thread->refcount--;
205 if (new_thread->flags & THR_FLAGS_NEED_SUSPEND) {
207 _thr_umtx_wake(&new_thread->cycle, INT_MAX, 0);
209 _thr_try_gc(curthread, new_thread); /* thread lock released */
210 atomic_add_int(&_thread_active_threads, -1);
212 if (cpusetp != NULL) {
213 if (cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID,
214 TID(new_thread), cpusetsize, cpusetp)) {
216 /* kill the new thread */
217 new_thread->force_exit = 1;
218 new_thread->flags |= THR_FLAGS_DETACHED;
219 _thr_try_gc(curthread, new_thread);
220 /* thread lock released */
225 _thr_report_creation(curthread, new_thread);
226 THR_THREAD_UNLOCK(curthread, new_thread);
235 create_stack(struct pthread_attr *pattr)
239 /* Check if a stack was specified in the thread attributes: */
240 if ((pattr->stackaddr_attr) != NULL) {
241 pattr->guardsize_attr = 0;
242 pattr->flags |= THR_STACK_USER;
246 ret = _thr_stack_alloc(pattr);
251 thread_start(struct pthread *curthread)
255 if (curthread->attr.suspend == THR_CREATE_SUSPENDED)
256 set = curthread->sigmask;
259 * This is used as a serialization point to allow parent
260 * to report 'new thread' event to debugger or tweak new thread's
261 * attributes before the new thread does real-world work.
264 THR_UNLOCK(curthread);
266 if (curthread->force_exit)
267 _pthread_exit(PTHREAD_CANCELED);
269 if (curthread->attr.suspend == THR_CREATE_SUSPENDED) {
271 /* Done in THR_UNLOCK() */
276 * Parent thread have stored signal mask for us,
277 * we should restore it now.
279 __sys_sigprocmask(SIG_SETMASK, &set, NULL);
282 #ifdef _PTHREAD_FORCED_UNWIND
283 curthread->unwind_stackend = (char *)curthread->attr.stackaddr_attr +
284 curthread->attr.stacksize_attr;
287 /* Run the current thread's start routine with argument: */
288 _pthread_exit(curthread->start_routine(curthread->arg));
290 /* This point should never be reached. */
291 PANIC("Thread has resumed after exit");