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>
39 #include <pthread_np.h>
40 #include "un-namespace.h"
42 #include "thr_private.h"
44 static int create_stack(struct pthread_attr *pattr);
45 static void thread_start(struct pthread *curthread);
47 __weak_reference(_pthread_create, pthread_create);
50 _pthread_create(pthread_t * thread, const pthread_attr_t * attr,
51 void *(*start_routine) (void *), void *arg)
53 struct pthread *curthread, *new_thread;
54 struct thr_param param;
55 struct sched_param sched_param;
57 int ret = 0, locked, create_suspended;
59 cpuset_t *cpusetp = NULL;
65 * Tell libc and others now they need lock to protect their data.
67 if (_thr_isthreaded() == 0 && _thr_setthreaded(1))
70 curthread = _get_curthread();
71 if ((new_thread = _thr_alloc(curthread)) == NULL)
74 memset(¶m, 0, sizeof(param));
76 if (attr == NULL || *attr == NULL)
77 /* Use the default thread attributes: */
78 new_thread->attr = _pthread_attr_default;
80 new_thread->attr = *(*attr);
81 cpusetp = new_thread->attr.cpuset;
82 cpusetsize = new_thread->attr.cpusetsize;
83 new_thread->attr.cpuset = NULL;
84 new_thread->attr.cpusetsize = 0;
86 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) {
87 /* inherit scheduling contention scope */
88 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
89 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM;
91 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM;
93 new_thread->attr.prio = curthread->attr.prio;
94 new_thread->attr.sched_policy = curthread->attr.sched_policy;
97 new_thread->tid = TID_TERMINATED;
99 if (create_stack(&new_thread->attr) != 0) {
100 /* Insufficient memory to create a stack: */
101 _thr_free(curthread, new_thread);
105 * Write a magic value to the thread structure
106 * to help identify valid ones:
108 new_thread->magic = THR_MAGIC;
109 new_thread->start_routine = start_routine;
110 new_thread->arg = arg;
111 new_thread->cancel_enable = 1;
112 new_thread->cancel_async = 0;
113 /* Initialize the mutex queue: */
114 TAILQ_INIT(&new_thread->mutexq);
115 TAILQ_INIT(&new_thread->pp_mutexq);
117 /* Initialise hooks in the thread structure: */
118 if (new_thread->attr.suspend == THR_CREATE_SUSPENDED) {
119 new_thread->flags = THR_FLAGS_NEED_SUSPEND;
120 create_suspended = 1;
122 create_suspended = 0;
125 new_thread->state = PS_RUNNING;
127 if (new_thread->attr.flags & PTHREAD_CREATE_DETACHED)
128 new_thread->tlflags |= TLFLAGS_DETACHED;
130 if (curthread->in_sigcancel_handler)
131 new_thread->unblock_sigcancel = 1;
133 new_thread->unblock_sigcancel = 0;
135 /* Add the new thread. */
136 new_thread->refcount = 1;
137 _thr_link(curthread, new_thread);
138 /* Return thread pointer eariler so that new thread can use it. */
139 (*thread) = new_thread;
140 if (SHOULD_REPORT_EVENT(curthread, TD_CREATE) || cpusetp != NULL) {
141 THR_THREAD_LOCK(curthread, new_thread);
145 param.start_func = (void (*)(void *)) thread_start;
146 param.arg = new_thread;
147 param.stack_base = new_thread->attr.stackaddr_attr;
148 param.stack_size = new_thread->attr.stacksize_attr;
149 param.tls_base = (char *)new_thread->tcb;
150 param.tls_size = sizeof(struct tcb);
151 param.child_tid = &new_thread->tid;
152 param.parent_tid = &new_thread->tid;
154 if (new_thread->attr.flags & PTHREAD_SCOPE_SYSTEM)
155 param.flags |= THR_SYSTEM_SCOPE;
156 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED)
159 sched_param.sched_priority = new_thread->attr.prio;
160 _schedparam_to_rtp(new_thread->attr.sched_policy,
165 /* Schedule the new thread. */
166 if (create_suspended) {
168 SIGDELSET(set, SIGTRAP);
169 __sys_sigprocmask(SIG_SETMASK, &set, &oset);
170 new_thread->sigmask = oset;
171 SIGDELSET(new_thread->sigmask, SIGCANCEL);
174 ret = thr_new(¶m, sizeof(param));
179 * Translate EPROCLIM into well-known POSIX code EAGAIN.
185 if (create_suspended)
186 __sys_sigprocmask(SIG_SETMASK, &oset, NULL);
190 THR_THREAD_LOCK(curthread, new_thread);
191 new_thread->state = PS_DEAD;
192 new_thread->tid = TID_TERMINATED;
193 if (new_thread->flags & THR_FLAGS_NEED_SUSPEND) {
195 _thr_umtx_wake(&new_thread->cycle, INT_MAX, 0);
197 THR_THREAD_UNLOCK(curthread, new_thread);
198 THREAD_LIST_LOCK(curthread);
199 _thread_active_threads--;
200 new_thread->tlflags |= TLFLAGS_DETACHED;
201 _thr_ref_delete_unlocked(curthread, new_thread);
202 THREAD_LIST_UNLOCK(curthread);
204 if (cpusetp != NULL) {
205 if (cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID,
206 TID(new_thread), cpusetsize, cpusetp)) {
208 /* kill the new thread */
209 new_thread->force_exit = 1;
210 THR_THREAD_UNLOCK(curthread, new_thread);
215 _thr_report_creation(curthread, new_thread);
216 THR_THREAD_UNLOCK(curthread, new_thread);
219 THREAD_LIST_LOCK(curthread);
220 new_thread->tlflags |= TLFLAGS_DETACHED;
221 THR_GCLIST_ADD(new_thread);
222 THREAD_LIST_UNLOCK(curthread);
232 create_stack(struct pthread_attr *pattr)
236 /* Check if a stack was specified in the thread attributes: */
237 if ((pattr->stackaddr_attr) != NULL) {
238 pattr->guardsize_attr = 0;
239 pattr->flags |= THR_STACK_USER;
243 ret = _thr_stack_alloc(pattr);
248 thread_start(struct pthread *curthread)
252 if (curthread->attr.suspend == THR_CREATE_SUSPENDED)
253 set = curthread->sigmask;
256 * This is used as a serialization point to allow parent
257 * to report 'new thread' event to debugger or tweak new thread's
258 * attributes before the new thread does real-world work.
261 THR_UNLOCK(curthread);
263 if (curthread->force_exit)
264 _pthread_exit(PTHREAD_CANCELED);
266 if (curthread->unblock_sigcancel) {
270 SIGADDSET(set1, SIGCANCEL);
271 __sys_sigprocmask(SIG_UNBLOCK, &set1, NULL);
274 if (curthread->attr.suspend == THR_CREATE_SUSPENDED) {
276 /* Done in THR_UNLOCK() */
281 * Parent thread have stored signal mask for us,
282 * we should restore it now.
284 __sys_sigprocmask(SIG_SETMASK, &set, NULL);
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");