1 /* 2 * Copyright (c) 2003 Daniel M. Eischen <deischen@gdeb.com> 3 * Copyright (c) 2005, David Xu <davidxu@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * 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 * 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. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include "namespace.h" 31 #include <sys/types.h> 32 #include <sys/signalvar.h> 33 #include <errno.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <stddef.h> 37 #include <pthread.h> 38 #include "un-namespace.h" 39 40 #include "thr_private.h" 41 42 static int create_stack(struct pthread_attr *pattr); 43 static void thread_start(struct pthread *curthread); 44 45 __weak_reference(_pthread_create, pthread_create); 46 47 int 48 _pthread_create(pthread_t * thread, const pthread_attr_t * attr, 49 void *(*start_routine) (void *), void *arg) 50 { 51 struct pthread *curthread, *new_thread; 52 struct thr_param param; 53 struct thr_sched_param sched_param; 54 int ret = 0, locked, create_suspended; 55 sigset_t set, oset; 56 57 _thr_check_init(); 58 59 /* 60 * Tell libc and others now they need lock to protect their data. 61 */ 62 if (_thr_isthreaded() == 0 && _thr_setthreaded(1)) 63 return (EAGAIN); 64 65 curthread = _get_curthread(); 66 if ((new_thread = _thr_alloc(curthread)) == NULL) 67 return (EAGAIN); 68 69 memset(¶m, 0, sizeof(param)); 70 71 if (attr == NULL || *attr == NULL) 72 /* Use the default thread attributes: */ 73 new_thread->attr = _pthread_attr_default; 74 else 75 new_thread->attr = *(*attr); 76 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) { 77 /* inherit scheduling contention scope */ 78 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) 79 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; 80 else 81 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; 82 83 new_thread->attr.prio = curthread->attr.prio; 84 new_thread->attr.sched_policy = curthread->attr.sched_policy; 85 } 86 87 if (_thr_scope_system > 0) 88 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; 89 else if (_thr_scope_system < 0) 90 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; 91 92 new_thread->tid = TID_TERMINATED; 93 94 if (create_stack(&new_thread->attr) != 0) { 95 /* Insufficient memory to create a stack: */ 96 _thr_free(curthread, new_thread); 97 return (EAGAIN); 98 } 99 /* 100 * Write a magic value to the thread structure 101 * to help identify valid ones: 102 */ 103 new_thread->magic = THR_MAGIC; 104 new_thread->start_routine = start_routine; 105 new_thread->arg = arg; 106 new_thread->cancelflags = PTHREAD_CANCEL_ENABLE | 107 PTHREAD_CANCEL_DEFERRED; 108 /* Initialize the mutex queue: */ 109 TAILQ_INIT(&new_thread->mutexq); 110 111 /* Initialise hooks in the thread structure: */ 112 if (new_thread->attr.suspend == THR_CREATE_SUSPENDED) { 113 new_thread->flags = THR_FLAGS_NEED_SUSPEND; 114 create_suspended = 1; 115 } else { 116 create_suspended = 0; 117 } 118 119 new_thread->state = PS_RUNNING; 120 121 if (new_thread->attr.flags & PTHREAD_CREATE_DETACHED) 122 new_thread->tlflags |= TLFLAGS_DETACHED; 123 124 /* Add the new thread. */ 125 new_thread->refcount = 1; 126 _thr_link(curthread, new_thread); 127 /* Return thread pointer eariler so that new thread can use it. */ 128 (*thread) = new_thread; 129 if (SHOULD_REPORT_EVENT(curthread, TD_CREATE)) { 130 THR_THREAD_LOCK(curthread, new_thread); 131 locked = 1; 132 } else 133 locked = 0; 134 param.start_func = (void (*)(void *)) thread_start; 135 param.arg = new_thread; 136 param.stack_base = new_thread->attr.stackaddr_attr; 137 param.stack_size = new_thread->attr.stacksize_attr; 138 param.tls_base = (char *)new_thread->tcb; 139 param.tls_size = sizeof(struct tcb); 140 param.child_tid = &new_thread->tid; 141 param.parent_tid = &new_thread->tid; 142 param.flags = 0; 143 if (new_thread->attr.flags & PTHREAD_SCOPE_SYSTEM) 144 param.flags |= THR_SYSTEM_SCOPE; 145 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) 146 param.sched_param = NULL; 147 else { 148 param.sched_param = &sched_param; 149 param.sched_param_size = sizeof(sched_param); 150 sched_param.policy = new_thread->attr.sched_policy; 151 sched_param.param.sched_priority = new_thread->attr.prio; 152 } 153 154 /* Schedule the new thread. */ 155 if (create_suspended) { 156 SIGFILLSET(set); 157 SIGDELSET(set, SIGTRAP); 158 __sys_sigprocmask(SIG_SETMASK, &set, &oset); 159 new_thread->sigmask = oset; 160 } 161 162 ret = thr_new(¶m, sizeof(param)); 163 164 if (ret != 0) { 165 ret = errno; 166 /* 167 * Translate EPROCLIM into well-known POSIX code EAGAIN. 168 */ 169 if (ret == EPROCLIM) 170 ret = EAGAIN; 171 } 172 173 if (create_suspended) 174 __sys_sigprocmask(SIG_SETMASK, &oset, NULL); 175 176 if (ret != 0) { 177 if (!locked) 178 THR_THREAD_LOCK(curthread, new_thread); 179 new_thread->state = PS_DEAD; 180 new_thread->tid = TID_TERMINATED; 181 if (new_thread->flags & THR_FLAGS_NEED_SUSPEND) { 182 new_thread->cycle++; 183 _thr_umtx_wake(&new_thread->cycle, INT_MAX); 184 } 185 THR_THREAD_UNLOCK(curthread, new_thread); 186 THREAD_LIST_LOCK(curthread); 187 _thread_active_threads--; 188 new_thread->tlflags |= TLFLAGS_DETACHED; 189 _thr_ref_delete_unlocked(curthread, new_thread); 190 THREAD_LIST_UNLOCK(curthread); 191 (*thread) = 0; 192 } else if (locked) { 193 _thr_report_creation(curthread, new_thread); 194 THR_THREAD_UNLOCK(curthread, new_thread); 195 } 196 return (ret); 197 } 198 199 static int 200 create_stack(struct pthread_attr *pattr) 201 { 202 int ret; 203 204 /* Check if a stack was specified in the thread attributes: */ 205 if ((pattr->stackaddr_attr) != NULL) { 206 pattr->guardsize_attr = 0; 207 pattr->flags |= THR_STACK_USER; 208 ret = 0; 209 } 210 else 211 ret = _thr_stack_alloc(pattr); 212 return (ret); 213 } 214 215 static void 216 thread_start(struct pthread *curthread) 217 { 218 if (curthread->attr.suspend == THR_CREATE_SUSPENDED) { 219 sigset_t set = curthread->sigmask; 220 221 _thr_ast(curthread); 222 223 /* 224 * Parent thread have stored signal mask for us, 225 * we should restore it now. 226 */ 227 sigprocmask(SIG_SETMASK, &set, NULL); 228 } 229 230 /* 231 * This is used as a serialization point to allow parent 232 * to report 'new thread' event to debugger before the thread 233 * does real work. 234 */ 235 THR_LOCK(curthread); 236 THR_UNLOCK(curthread); 237 238 /* Run the current thread's start routine with argument: */ 239 _pthread_exit(curthread->start_routine(curthread->arg)); 240 241 /* This point should never be reached. */ 242 PANIC("Thread has resumed after exit"); 243 } 244