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 static u_int64_t next_uniqueid = 1; 47 48 #define OFF(f) offsetof(struct pthread, f) 49 int _thread_next_offset = OFF(tle.tqe_next); 50 int _thread_uniqueid_offset = OFF(uniqueid); 51 int _thread_state_offset = OFF(state); 52 int _thread_name_offset = OFF(name); 53 int _thread_ctx_offset = OFF(ctx); 54 #undef OFF 55 56 int _thread_PS_RUNNING_value = PS_RUNNING; 57 int _thread_PS_DEAD_value = PS_DEAD; 58 59 __weak_reference(_pthread_create, pthread_create); 60 61 int 62 _pthread_create(pthread_t * thread, const pthread_attr_t * attr, 63 void *(*start_routine) (void *), void *arg) 64 { 65 int ret = 0; 66 pthread_t new_thread; 67 pthread_attr_t pattr; 68 int flags; 69 void *stack; 70 71 /* 72 * Locking functions in libc are required when there are 73 * threads other than the initial thread. 74 */ 75 __isthreaded = 1; 76 77 /* Allocate memory for the thread structure: */ 78 if ((new_thread = (pthread_t) malloc(sizeof(struct pthread))) == NULL) 79 return (EAGAIN); 80 81 /* Check if default thread attributes are required: */ 82 if (attr == NULL || *attr == NULL) 83 pattr = &pthread_attr_default; 84 else 85 pattr = *attr; 86 87 /* Check if a stack was specified in the thread attributes: */ 88 if ((stack = pattr->stackaddr_attr) == NULL) { 89 stack = _thread_stack_alloc(pattr->stacksize_attr, 90 pattr->guardsize_attr); 91 if (stack == NULL) { 92 free(new_thread); 93 return (EAGAIN); 94 } 95 } 96 97 /* Initialise the thread structure: */ 98 init_td_common(new_thread, pattr, 0); 99 new_thread->stack = stack; 100 new_thread->start_routine = start_routine; 101 new_thread->arg = arg; 102 103 /* Initialise the machine context: */ 104 getcontext(&new_thread->ctx); 105 new_thread->ctx.uc_stack.ss_sp = new_thread->stack; 106 new_thread->ctx.uc_stack.ss_size = pattr->stacksize_attr; 107 makecontext(&new_thread->ctx, _thread_start, 0); 108 new_thread->arch_id = _set_curthread(&new_thread->ctx, new_thread, &ret); 109 if (ret != 0) { 110 if (pattr->stackaddr_attr == NULL) { 111 STACK_LOCK; 112 _thread_stack_free(new_thread->stack, 113 pattr->stacksize_attr, pattr->guardsize_attr); 114 STACK_UNLOCK; 115 } 116 free(new_thread); 117 return (ret); 118 } 119 120 /* 121 * Check if this thread is to inherit the scheduling 122 * attributes from its parent: 123 */ 124 if (new_thread->attr.flags & PTHREAD_INHERIT_SCHED) { 125 /* Copy the scheduling attributes: */ 126 new_thread->base_priority = curthread->base_priority & 127 ~PTHREAD_SIGNAL_PRIORITY; 128 new_thread->attr.prio = curthread->base_priority & 129 ~PTHREAD_SIGNAL_PRIORITY; 130 new_thread->attr.sched_policy = curthread->attr.sched_policy; 131 } else { 132 /* 133 * Use just the thread priority, leaving the 134 * other scheduling attributes as their 135 * default values: 136 */ 137 new_thread->base_priority = new_thread->attr.prio; 138 } 139 new_thread->active_priority = new_thread->base_priority; 140 141 /* 142 * Initialise the unique id which GDB uses to 143 * track threads. 144 */ 145 new_thread->uniqueid = next_uniqueid++; 146 147 THREAD_LIST_LOCK; 148 149 /* Add the thread to the linked list of all threads: */ 150 TAILQ_INSERT_HEAD(&_thread_list, new_thread, tle); 151 152 /* 153 * Create the thread. 154 * 155 */ 156 if (pattr->suspend == PTHREAD_CREATE_SUSPENDED) { 157 new_thread->flags |= PTHREAD_FLAGS_SUSPENDED; 158 flags = THR_SUSPENDED; 159 } else { 160 flags = 0; 161 } 162 163 ret = thr_create(&new_thread->ctx, &new_thread->thr_id, flags); 164 165 if (ret != 0) { 166 _thread_printf(STDERR_FILENO, "thr_create() == %d\n", ret); 167 PANIC("thr_create"); 168 } 169 170 THREAD_LIST_UNLOCK; 171 172 /* Return a pointer to the thread structure: */ 173 (*thread) = new_thread; 174 175 return (0); 176 } 177 178 void 179 _thread_start(void) 180 { 181 182 /* Run the current thread's start routine with argument: */ 183 pthread_exit(curthread->start_routine(curthread->arg)); 184 185 /* This point should never be reached. */ 186 PANIC("Thread has resumed after exit"); 187 } 188