1 /* 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> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 21 * 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 32 * SUCH DAMAGE. 33 * 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 1.12 2008/05/09 11:24:08 corecode Exp $ 36 */ 37 38 #include "namespace.h" 39 #include <errno.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <fcntl.h> 43 #include <unistd.h> 44 #include <stddef.h> 45 #include <sys/time.h> 46 #include <machine/reg.h> 47 #include <machine/tls.h> 48 49 #include <pthread.h> 50 #include <sys/signalvar.h> 51 #include "un-namespace.h" 52 53 #include "thr_private.h" 54 #include "libc_private.h" 55 56 static int create_stack(struct pthread_attr *pattr); 57 static void thread_start(void *); 58 59 int 60 _pthread_create(pthread_t * thread, const pthread_attr_t * attr, 61 void *(*start_routine) (void *), void *arg) 62 { 63 struct lwp_params create_params; 64 void *stack; 65 sigset_t sigmask, oldsigmask; 66 struct pthread *curthread, *new_thread; 67 int ret = 0, locked; 68 69 _thr_check_init(); 70 71 /* 72 * Tell libc and others now they need lock to protect their data. 73 */ 74 if (_thr_isthreaded() == 0 && _thr_setthreaded(1)) 75 return (EAGAIN); 76 77 curthread = tls_get_curthread(); 78 if ((new_thread = _thr_alloc(curthread)) == NULL) 79 return (EAGAIN); 80 81 if (attr == NULL || *attr == NULL) 82 /* Use the default thread attributes: */ 83 new_thread->attr = _pthread_attr_default; 84 else 85 new_thread->attr = *(*attr); 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; 90 else 91 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; 92 /* 93 * scheduling policy and scheduling parameters will be 94 * inherited in following code. 95 */ 96 } 97 98 if (_thread_scope_system > 0) 99 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; 100 else if (_thread_scope_system < 0) 101 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; 102 103 if (create_stack(&new_thread->attr) != 0) { 104 /* Insufficient memory to create a stack: */ 105 new_thread->terminated = 1; 106 _thr_free(curthread, new_thread); 107 return (EAGAIN); 108 } 109 /* 110 * Write a magic value to the thread structure 111 * to help identify valid ones: 112 */ 113 new_thread->magic = THR_MAGIC; 114 new_thread->start_routine = start_routine; 115 new_thread->arg = arg; 116 new_thread->cancelflags = PTHREAD_CANCEL_ENABLE | 117 PTHREAD_CANCEL_DEFERRED; 118 /* 119 * Check if this thread is to inherit the scheduling 120 * attributes from its parent: 121 */ 122 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) { 123 /* 124 * Copy the scheduling attributes. Lock the scheduling 125 * lock to get consistent scheduling parameters. 126 */ 127 THR_LOCK(curthread); 128 new_thread->base_priority = curthread->base_priority; 129 new_thread->attr.prio = curthread->base_priority; 130 new_thread->attr.sched_policy = curthread->attr.sched_policy; 131 THR_UNLOCK(curthread); 132 } else { 133 /* 134 * Use just the thread priority, leaving the 135 * other scheduling attributes as their 136 * default values: 137 */ 138 new_thread->base_priority = new_thread->attr.prio; 139 } 140 new_thread->active_priority = new_thread->base_priority; 141 142 /* Initialize the mutex queue: */ 143 TAILQ_INIT(&new_thread->mutexq); 144 145 /* Initialise hooks in the thread structure: */ 146 if (new_thread->attr.suspend == THR_CREATE_SUSPENDED) 147 new_thread->flags = THR_FLAGS_NEED_SUSPEND; 148 149 new_thread->state = PS_RUNNING; 150 151 if (new_thread->attr.flags & PTHREAD_CREATE_DETACHED) 152 new_thread->tlflags |= TLFLAGS_DETACHED; 153 154 /* Add the new thread. */ 155 new_thread->refcount = 1; 156 _thr_link(curthread, new_thread); 157 /* Return thread pointer eariler so that new thread can use it. */ 158 (*thread) = new_thread; 159 if (SHOULD_REPORT_EVENT(curthread, TD_CREATE)) { 160 THR_THREAD_LOCK(curthread, new_thread); 161 locked = 1; 162 } else 163 locked = 0; 164 /* Schedule the new thread. */ 165 stack = (char *)new_thread->attr.stackaddr_attr + 166 new_thread->attr.stacksize_attr; 167 bzero(&create_params, sizeof(create_params)); 168 create_params.func = thread_start; 169 create_params.arg = new_thread; 170 create_params.stack = stack; 171 create_params.tid1 = &new_thread->tid; 172 /* 173 * Thread created by thr_create() inherits currrent thread 174 * sigmask, however, before new thread setup itself correctly, 175 * it can not handle signal, so we should mask all signals here. 176 * We do this at the very last moment, so that we don't run 177 * into problems while we have all signals disabled. 178 */ 179 SIGFILLSET(sigmask); 180 __sys_sigprocmask(SIG_SETMASK, &sigmask, &oldsigmask); 181 new_thread->sigmask = oldsigmask; 182 ret = lwp_create(&create_params); 183 __sys_sigprocmask(SIG_SETMASK, &oldsigmask, NULL); 184 if (ret != 0) { 185 if (!locked) 186 THR_THREAD_LOCK(curthread, new_thread); 187 new_thread->state = PS_DEAD; 188 new_thread->terminated = 1; 189 if (new_thread->flags & THR_FLAGS_NEED_SUSPEND) { 190 new_thread->cycle++; 191 _thr_umtx_wake(&new_thread->cycle, INT_MAX); 192 } 193 THR_THREAD_UNLOCK(curthread, new_thread); 194 THREAD_LIST_LOCK(curthread); 195 _thread_active_threads--; 196 new_thread->tlflags |= TLFLAGS_DETACHED; 197 _thr_ref_delete_unlocked(curthread, new_thread); 198 THREAD_LIST_UNLOCK(curthread); 199 (*thread) = NULL; 200 ret = EAGAIN; 201 } else if (locked) { 202 _thr_report_creation(curthread, new_thread); 203 THR_THREAD_UNLOCK(curthread, new_thread); 204 } 205 return (ret); 206 } 207 208 static int 209 create_stack(struct pthread_attr *pattr) 210 { 211 int ret; 212 213 /* Check if a stack was specified in the thread attributes: */ 214 if ((pattr->stackaddr_attr) != NULL) { 215 pattr->guardsize_attr = 0; 216 pattr->flags |= THR_STACK_USER; 217 ret = 0; 218 } 219 else 220 ret = _thr_stack_alloc(pattr); 221 return (ret); 222 } 223 224 static void 225 thread_start(void *arg) 226 { 227 struct pthread *curthread = (struct pthread *)arg; 228 229 tls_set_tcb(curthread->tcb); 230 231 /* Thread was created with all signals blocked, unblock them. */ 232 __sys_sigprocmask(SIG_SETMASK, &curthread->sigmask, NULL); 233 234 THR_LOCK(curthread); 235 THR_UNLOCK(curthread); 236 237 if (curthread->flags & THR_FLAGS_NEED_SUSPEND) 238 _thr_suspend_check(curthread); 239 _nmalloc_thr_init(); 240 241 /* Run the current thread's start routine with argument: */ 242 _pthread_exit(curthread->start_routine(curthread->arg)); 243 244 /* This point should never be reached. */ 245 PANIC("Thread has resumed after exit"); 246 } 247 248 __strong_reference(_pthread_create, pthread_create); 249