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 <sys/types.h> 31 #include <sys/signalvar.h> 32 #include <errno.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <stddef.h> 36 #include <pthread.h> 37 38 #include "thr_private.h" 39 40 static void free_thread(struct pthread *curthread, struct pthread *thread); 41 static int create_stack(struct pthread_attr *pattr); 42 static void free_stack(struct pthread *curthread, 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 int ret = 0, locked; 54 55 _thr_check_init(); 56 57 /* 58 * Tell libc and others now they need lock to protect their data. 59 */ 60 if (_thr_isthreaded() == 0 && _thr_setthreaded(1)) 61 return (EAGAIN); 62 63 curthread = _get_curthread(); 64 if ((new_thread = _thr_alloc(curthread)) == NULL) 65 return (EAGAIN); 66 67 memset(¶m, 0, sizeof(param)); 68 69 if (attr == NULL || *attr == NULL) 70 /* Use the default thread attributes: */ 71 new_thread->attr = _pthread_attr_default; 72 else 73 new_thread->attr = *(*attr); 74 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) { 75 /* inherit scheduling contention scope */ 76 if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) 77 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; 78 else 79 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; 80 /* 81 * scheduling policy and scheduling parameters will be 82 * inherited in following code. 83 */ 84 } 85 86 if (_thr_scope_system > 0) 87 new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; 88 else if (_thr_scope_system < 0) 89 new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; 90 91 new_thread->tid = TID_TERMINATED; 92 93 if (create_stack(&new_thread->attr) != 0) { 94 /* Insufficient memory to create a stack: */ 95 _thr_free(curthread, new_thread); 96 return (EAGAIN); 97 } 98 /* 99 * Write a magic value to the thread structure 100 * to help identify valid ones: 101 */ 102 new_thread->magic = THR_MAGIC; 103 new_thread->start_routine = start_routine; 104 new_thread->arg = arg; 105 new_thread->cancelflags = PTHREAD_CANCEL_ENABLE | 106 PTHREAD_CANCEL_DEFERRED; 107 /* 108 * Check if this thread is to inherit the scheduling 109 * attributes from its parent: 110 */ 111 if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) { 112 /* 113 * Copy the scheduling attributes. Lock the scheduling 114 * lock to get consistent scheduling parameters. 115 */ 116 THR_LOCK(curthread); 117 new_thread->base_priority = curthread->base_priority; 118 new_thread->attr.prio = curthread->base_priority; 119 new_thread->attr.sched_policy = curthread->attr.sched_policy; 120 THR_UNLOCK(curthread); 121 } else { 122 /* 123 * Use just the thread priority, leaving the 124 * other scheduling attributes as their 125 * default values: 126 */ 127 new_thread->base_priority = new_thread->attr.prio; 128 } 129 new_thread->active_priority = new_thread->base_priority; 130 131 /* Initialize the mutex queue: */ 132 TAILQ_INIT(&new_thread->mutexq); 133 TAILQ_INIT(&new_thread->pri_mutexq); 134 135 /* Initialise hooks in the thread structure: */ 136 if (new_thread->attr.suspend == THR_CREATE_SUSPENDED) 137 new_thread->flags = THR_FLAGS_NEED_SUSPEND; 138 new_thread->state = PS_RUNNING; 139 140 /* Add the new thread. */ 141 _thr_link(curthread, new_thread); 142 /* Return thread pointer eariler so that new thread can use it. */ 143 (*thread) = new_thread; 144 if (SHOULD_REPORT_EVENT(curthread, TD_CREATE)) { 145 THR_THREAD_LOCK(curthread, new_thread); 146 locked = 1; 147 } else 148 locked = 0; 149 param.start_func = (void (*)(void *)) thread_start; 150 param.arg = new_thread; 151 param.stack_base = new_thread->attr.stackaddr_attr; 152 param.stack_size = new_thread->attr.stacksize_attr; 153 param.tls_base = (char *)new_thread->tcb; 154 param.tls_size = sizeof(struct tcb); 155 param.child_tid = &new_thread->tid; 156 param.parent_tid = &new_thread->tid; 157 param.flags = 0; 158 if (new_thread->attr.flags & PTHREAD_SCOPE_SYSTEM) 159 param.flags |= THR_SYSTEM_SCOPE; 160 /* Schedule the new thread. */ 161 ret = thr_new(¶m, sizeof(param)); 162 if (ret != 0) { 163 if (locked) 164 THR_THREAD_UNLOCK(curthread, new_thread); 165 _thr_unlink(curthread, new_thread); 166 free_thread(curthread, new_thread); 167 (*thread) = 0; 168 ret = EAGAIN; 169 } else if (locked) { 170 _thr_report_creation(curthread, new_thread); 171 THR_THREAD_UNLOCK(curthread, new_thread); 172 } 173 return (ret); 174 } 175 176 static void 177 free_thread(struct pthread *curthread, struct pthread *thread) 178 { 179 free_stack(curthread, &thread->attr); 180 curthread->tid = TID_TERMINATED; 181 _thr_free(curthread, thread); 182 } 183 184 static int 185 create_stack(struct pthread_attr *pattr) 186 { 187 int ret; 188 189 /* Check if a stack was specified in the thread attributes: */ 190 if ((pattr->stackaddr_attr) != NULL) { 191 pattr->guardsize_attr = 0; 192 pattr->flags |= THR_STACK_USER; 193 ret = 0; 194 } 195 else 196 ret = _thr_stack_alloc(pattr); 197 return (ret); 198 } 199 200 static void 201 free_stack(struct pthread *curthread, struct pthread_attr *pattr) 202 { 203 if ((pattr->flags & THR_STACK_USER) == 0) { 204 THREAD_LIST_LOCK(curthread); 205 /* Stack routines don't use malloc/free. */ 206 _thr_stack_free(pattr); 207 THREAD_LIST_UNLOCK(curthread); 208 } 209 } 210 211 static void 212 thread_start(struct pthread *curthread) 213 { 214 if (curthread->flags & THR_FLAGS_NEED_SUSPEND) 215 _thr_suspend_check(curthread); 216 217 THR_LOCK(curthread); 218 THR_UNLOCK(curthread); 219 220 /* Run the current thread's start routine with argument: */ 221 pthread_exit(curthread->start_routine(curthread->arg)); 222 223 /* This point should never be reached. */ 224 PANIC("Thread has resumed after exit"); 225 } 226