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 f_gc = 0; 66 int ret = 0; 67 pthread_t gc_thread; 68 pthread_t new_thread; 69 pthread_attr_t pattr; 70 int flags; 71 void *stack; 72 73 /* 74 * Locking functions in libc are required when there are 75 * threads other than the initial thread. 76 */ 77 __isthreaded = 1; 78 79 /* Allocate memory for the thread structure: */ 80 if ((new_thread = (pthread_t) malloc(sizeof(struct pthread))) == NULL) 81 return (EAGAIN); 82 83 /* Check if default thread attributes are required: */ 84 if (attr == NULL || *attr == NULL) 85 pattr = &pthread_attr_default; 86 else 87 pattr = *attr; 88 89 /* Check if a stack was specified in the thread attributes: */ 90 if ((stack = pattr->stackaddr_attr) == NULL) { 91 stack = _thread_stack_alloc(pattr->stacksize_attr, 92 pattr->guardsize_attr); 93 if (stack == NULL) { 94 free(new_thread); 95 return (EAGAIN); 96 } 97 } 98 99 /* Initialise the thread structure: */ 100 init_td_common(new_thread, pattr, 0); 101 new_thread->stack = stack; 102 new_thread->start_routine = start_routine; 103 new_thread->arg = arg; 104 105 /* Initialise the machine context: */ 106 getcontext(&new_thread->ctx); 107 new_thread->ctx.uc_stack.ss_sp = new_thread->stack; 108 new_thread->ctx.uc_stack.ss_size = pattr->stacksize_attr; 109 makecontext(&new_thread->ctx, _thread_start, 0); 110 new_thread->arch_id = _set_curthread(&new_thread->ctx, new_thread, &ret); 111 if (ret != 0) { 112 if (pattr->stackaddr_attr == NULL) { 113 STACK_LOCK; 114 _thread_stack_free(new_thread->stack, 115 pattr->stacksize_attr, pattr->guardsize_attr); 116 STACK_UNLOCK; 117 } 118 free(new_thread); 119 return (ret); 120 } 121 122 /* 123 * Check if this thread is to inherit the scheduling 124 * attributes from its parent: 125 */ 126 if (new_thread->attr.flags & PTHREAD_INHERIT_SCHED) { 127 /* Copy the scheduling attributes: */ 128 new_thread->base_priority = curthread->base_priority & 129 ~PTHREAD_SIGNAL_PRIORITY; 130 new_thread->attr.prio = curthread->base_priority & 131 ~PTHREAD_SIGNAL_PRIORITY; 132 new_thread->attr.sched_policy = curthread->attr.sched_policy; 133 } else { 134 /* 135 * Use just the thread priority, leaving the 136 * other scheduling attributes as their 137 * default values: 138 */ 139 new_thread->base_priority = new_thread->attr.prio; 140 } 141 new_thread->active_priority = new_thread->base_priority; 142 143 /* 144 * Initialise the unique id which GDB uses to 145 * track threads. 146 */ 147 new_thread->uniqueid = next_uniqueid++; 148 149 THREAD_LIST_LOCK; 150 151 /* 152 * Check if the garbage collector thread 153 * needs to be started. 154 */ 155 f_gc = (TAILQ_FIRST(&_thread_list) == _thread_initial); 156 157 /* Add the thread to the linked list of all threads: */ 158 TAILQ_INSERT_HEAD(&_thread_list, new_thread, tle); 159 160 /* 161 * Create the thread. 162 * 163 */ 164 if (pattr->suspend == PTHREAD_CREATE_SUSPENDED) { 165 new_thread->flags |= PTHREAD_FLAGS_SUSPENDED; 166 flags = THR_SUSPENDED; 167 } else { 168 flags = 0; 169 } 170 171 ret = thr_create(&new_thread->ctx, &new_thread->thr_id, flags); 172 173 if (ret != 0) { 174 _thread_printf(STDERR_FILENO, "thr_create() == %d\n", ret); 175 PANIC("thr_create"); 176 } 177 178 THREAD_LIST_UNLOCK; 179 180 /* Return a pointer to the thread structure: */ 181 (*thread) = new_thread; 182 183 /* 184 * Start a garbage collector thread 185 * if necessary. 186 */ 187 if (f_gc && pthread_create(&gc_thread,NULL, _thread_gc,NULL) != 0) 188 PANIC("Can't create gc thread"); 189 190 return (0); 191 } 192 193 void 194 _thread_start(void) 195 { 196 197 /* Run the current thread's start routine with argument: */ 198 pthread_exit(curthread->start_routine(curthread->arg)); 199 200 /* This point should never be reached. */ 201 PANIC("Thread has resumed after exit"); 202 } 203