1 /* 2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by John Birrell. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 #include <errno.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <fcntl.h> 38 #include <unistd.h> 39 #include <stddef.h> 40 #include <sys/time.h> 41 #include <machine/reg.h> 42 #include <pthread.h> 43 #include "thr_private.h" 44 #include "libc_private.h" 45 46 #define OFF(f) offsetof(struct pthread, f) 47 int _thread_thr_id_offset = OFF(thr_id); 48 int _thread_next_offset = OFF(tle.tqe_next); 49 int _thread_name_offset = OFF(name); 50 int _thread_ctx_offset = OFF(ctx); 51 #undef OFF 52 53 int _thread_PS_RUNNING_value = PS_RUNNING; 54 int _thread_PS_DEAD_value = PS_DEAD; 55 56 __weak_reference(_pthread_create, pthread_create); 57 58 int 59 _pthread_create(pthread_t * thread, const pthread_attr_t * attr, 60 void *(*start_routine) (void *), void *arg) 61 { 62 int ret = 0; 63 pthread_t new_thread; 64 pthread_attr_t pattr; 65 int flags; 66 void *stack; 67 68 /* 69 * Locking functions in libc are required when there are 70 * threads other than the initial thread. 71 */ 72 __isthreaded = 1; 73 74 /* Allocate memory for the thread structure: */ 75 if ((new_thread = (pthread_t) malloc(sizeof(struct pthread))) == NULL) 76 return (EAGAIN); 77 78 /* Check if default thread attributes are required: */ 79 if (attr == NULL || *attr == NULL) 80 pattr = &pthread_attr_default; 81 else 82 pattr = *attr; 83 84 /* Check if a stack was specified in the thread attributes: */ 85 if ((stack = pattr->stackaddr_attr) == NULL) { 86 stack = _thread_stack_alloc(pattr->stacksize_attr, 87 pattr->guardsize_attr); 88 if (stack == NULL) { 89 free(new_thread); 90 return (EAGAIN); 91 } 92 } 93 94 /* Initialise the thread structure: */ 95 init_td_common(new_thread, pattr, 0); 96 new_thread->stack = stack; 97 new_thread->start_routine = start_routine; 98 new_thread->arg = arg; 99 100 /* Initialise the machine context: */ 101 getcontext(&new_thread->ctx); 102 new_thread->ctx.uc_stack.ss_sp = new_thread->stack; 103 new_thread->ctx.uc_stack.ss_size = pattr->stacksize_attr; 104 makecontext(&new_thread->ctx, _thread_start, 0); 105 new_thread->arch_id = _set_curthread(&new_thread->ctx, new_thread, &ret); 106 if (ret != 0) { 107 if (pattr->stackaddr_attr == NULL) { 108 STACK_LOCK; 109 _thread_stack_free(new_thread->stack, 110 pattr->stacksize_attr, pattr->guardsize_attr); 111 STACK_UNLOCK; 112 } 113 free(new_thread); 114 return (ret); 115 } 116 117 /* 118 * Check if this thread is to inherit the scheduling 119 * attributes from its parent: 120 */ 121 if (new_thread->attr.flags & PTHREAD_INHERIT_SCHED) { 122 /* Copy the scheduling attributes: */ 123 new_thread->base_priority = curthread->base_priority & 124 ~PTHREAD_SIGNAL_PRIORITY; 125 new_thread->attr.prio = curthread->base_priority & 126 ~PTHREAD_SIGNAL_PRIORITY; 127 new_thread->attr.sched_policy = curthread->attr.sched_policy; 128 } else { 129 /* 130 * Use just the thread priority, leaving the 131 * other scheduling attributes as their 132 * default values: 133 */ 134 new_thread->base_priority = new_thread->attr.prio; 135 } 136 new_thread->active_priority = new_thread->base_priority; 137 138 THREAD_LIST_LOCK; 139 140 /* Add the thread to the linked list of all threads: */ 141 TAILQ_INSERT_HEAD(&_thread_list, new_thread, tle); 142 143 /* 144 * Create the thread. 145 */ 146 if (pattr->suspend == PTHREAD_CREATE_SUSPENDED) 147 new_thread->flags |= PTHREAD_FLAGS_SUSPENDED; 148 ret = thr_create(&new_thread->ctx, &new_thread->thr_id, flags); 149 if (ret != 0) { 150 _thread_printf(STDERR_FILENO, "thr_create() == %d\n", ret); 151 PANIC("thr_create"); 152 } 153 154 THREAD_LIST_UNLOCK; 155 156 /* Return a pointer to the thread structure: */ 157 (*thread) = new_thread; 158 159 return (0); 160 } 161 162 void 163 _thread_start(void) 164 { 165 if ((curthread->flags & PTHREAD_FLAGS_SUSPENDED) != 0) 166 _thread_suspend(curthread, NULL); 167 pthread_exit(curthread->start_routine(curthread->arg)); 168 169 /* This point should never be reached. */ 170 PANIC("Thread has resumed after exit"); 171 } 172