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_next_offset = OFF(tle.tqe_next); 48 int _thread_name_offset = OFF(name); 49 int _thread_ctx_offset = OFF(ctx); 50 #undef OFF 51 52 int _thread_PS_RUNNING_value = PS_RUNNING; 53 int _thread_PS_DEAD_value = PS_DEAD; 54 55 __weak_reference(_pthread_create, pthread_create); 56 57 int 58 _pthread_create(pthread_t * thread, const pthread_attr_t * attr, 59 void *(*start_routine) (void *), void *arg) 60 { 61 int ret = 0; 62 pthread_t new_thread; 63 pthread_attr_t pattr; 64 int flags; 65 void *stack; 66 67 /* 68 * Locking functions in libc are required when there are 69 * threads other than the initial thread. 70 */ 71 __isthreaded = 1; 72 73 /* Allocate memory for the thread structure: */ 74 if ((new_thread = (pthread_t) malloc(sizeof(struct pthread))) == NULL) 75 return (EAGAIN); 76 77 /* Check if default thread attributes are required: */ 78 if (attr == NULL || *attr == NULL) 79 pattr = &pthread_attr_default; 80 else 81 pattr = *attr; 82 83 /* Check if a stack was specified in the thread attributes: */ 84 if ((stack = pattr->stackaddr_attr) == NULL) { 85 stack = _thread_stack_alloc(pattr->stacksize_attr, 86 pattr->guardsize_attr); 87 if (stack == NULL) { 88 free(new_thread); 89 return (EAGAIN); 90 } 91 } 92 93 /* Initialise the thread structure: */ 94 init_td_common(new_thread, pattr, 0); 95 new_thread->stack = stack; 96 new_thread->start_routine = start_routine; 97 new_thread->arg = arg; 98 99 /* Initialise the machine context: */ 100 getcontext(&new_thread->ctx); 101 new_thread->ctx.uc_stack.ss_sp = new_thread->stack; 102 new_thread->ctx.uc_stack.ss_size = pattr->stacksize_attr; 103 makecontext(&new_thread->ctx, _thread_start, 0); 104 new_thread->arch_id = _set_curthread(&new_thread->ctx, new_thread, &ret); 105 if (ret != 0) { 106 if (pattr->stackaddr_attr == NULL) { 107 STACK_LOCK; 108 _thread_stack_free(new_thread->stack, 109 pattr->stacksize_attr, pattr->guardsize_attr); 110 STACK_UNLOCK; 111 } 112 free(new_thread); 113 return (ret); 114 } 115 116 /* 117 * Check if this thread is to inherit the scheduling 118 * attributes from its parent: 119 */ 120 if (new_thread->attr.flags & PTHREAD_INHERIT_SCHED) { 121 /* Copy the scheduling attributes: */ 122 new_thread->base_priority = curthread->base_priority & 123 ~PTHREAD_SIGNAL_PRIORITY; 124 new_thread->attr.prio = curthread->base_priority & 125 ~PTHREAD_SIGNAL_PRIORITY; 126 new_thread->attr.sched_policy = curthread->attr.sched_policy; 127 } else { 128 /* 129 * Use just the thread priority, leaving the 130 * other scheduling attributes as their 131 * default values: 132 */ 133 new_thread->base_priority = new_thread->attr.prio; 134 } 135 new_thread->active_priority = new_thread->base_priority; 136 137 THREAD_LIST_LOCK; 138 139 /* Add the thread to the linked list of all threads: */ 140 TAILQ_INSERT_HEAD(&_thread_list, new_thread, tle); 141 142 /* 143 * Create the thread. 144 */ 145 if (pattr->suspend == PTHREAD_CREATE_SUSPENDED) 146 new_thread->flags |= PTHREAD_FLAGS_SUSPENDED; 147 ret = thr_create(&new_thread->ctx, &new_thread->thr_id, flags); 148 if (ret != 0) { 149 _thread_printf(STDERR_FILENO, "thr_create() == %d\n", ret); 150 PANIC("thr_create"); 151 } 152 153 THREAD_LIST_UNLOCK; 154 155 /* Return a pointer to the thread structure: */ 156 (*thread) = new_thread; 157 158 return (0); 159 } 160 161 void 162 _thread_start(void) 163 { 164 if ((curthread->flags & PTHREAD_FLAGS_SUSPENDED) != 0) 165 _thread_suspend(curthread, NULL); 166 pthread_exit(curthread->start_routine(curthread->arg)); 167 168 /* This point should never be reached. */ 169 PANIC("Thread has resumed after exit"); 170 } 171