freebsd-nq/lib/libthr/thread/thr_create.c
David Xu 9027ac471c Adjust code to support AMD64, on AMD64, thread needs to set fsbase by
itself before it can execute any other code, so new thread should be
created with all signals are masked until after fsbase is set.
2004-08-19 23:49:04 +00:00

189 lines
5.9 KiB
C

/*
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <stddef.h>
#include <sys/time.h>
#include <machine/reg.h>
#include <pthread.h>
#include "thr_private.h"
#include "libc_private.h"
#define OFF(f) offsetof(struct pthread, f)
int _thread_thr_id_offset = OFF(thr_id);
int _thread_next_offset = OFF(tle.tqe_next);
int _thread_name_offset = OFF(name);
int _thread_ctx_offset = OFF(ctx);
#undef OFF
int _thread_PS_RUNNING_value = PS_RUNNING;
int _thread_PS_DEAD_value = PS_DEAD;
__weak_reference(_pthread_create, pthread_create);
int
_pthread_create(pthread_t * thread, const pthread_attr_t * attr,
void *(*start_routine) (void *), void *arg)
{
int ret = 0;
pthread_t new_thread;
pthread_attr_t pattr;
int flags;
void *stack;
/*
* Locking functions in libc are required when there are
* threads other than the initial thread.
*/
__isthreaded = 1;
/* Allocate memory for the thread structure: */
if ((new_thread = (pthread_t) malloc(sizeof(struct pthread))) == NULL)
return (EAGAIN);
/* Check if default thread attributes are required: */
if (attr == NULL || *attr == NULL)
pattr = &pthread_attr_default;
else
pattr = *attr;
/* Check if a stack was specified in the thread attributes: */
if ((stack = pattr->stackaddr_attr) == NULL) {
stack = _thread_stack_alloc(pattr->stacksize_attr,
pattr->guardsize_attr);
if (stack == NULL) {
free(new_thread);
return (EAGAIN);
}
}
/* Initialise the thread structure: */
init_td_common(new_thread, pattr, 0);
new_thread->stack = stack;
new_thread->start_routine = start_routine;
new_thread->arg = arg;
/* Initialise the machine context: */
getcontext(&new_thread->ctx);
new_thread->savedsig = new_thread->ctx.uc_sigmask;
new_thread->ctx.uc_stack.ss_sp = new_thread->stack;
new_thread->ctx.uc_stack.ss_size = pattr->stacksize_attr;
makecontext(&new_thread->ctx, (void (*)(void))_thread_start, 1, new_thread);
new_thread->arch_id = _set_curthread(&new_thread->ctx, new_thread, &ret);
if (ret != 0) {
if (pattr->stackaddr_attr == NULL) {
STACK_LOCK;
_thread_stack_free(new_thread->stack,
pattr->stacksize_attr, pattr->guardsize_attr);
STACK_UNLOCK;
}
free(new_thread);
return (ret);
}
/*
* Check if this thread is to inherit the scheduling
* attributes from its parent:
*/
if (new_thread->attr.flags & PTHREAD_INHERIT_SCHED) {
/* Copy the scheduling attributes: */
new_thread->base_priority = curthread->base_priority &
~PTHREAD_SIGNAL_PRIORITY;
new_thread->attr.prio = curthread->base_priority &
~PTHREAD_SIGNAL_PRIORITY;
new_thread->attr.sched_policy = curthread->attr.sched_policy;
} else {
/*
* Use just the thread priority, leaving the
* other scheduling attributes as their
* default values:
*/
new_thread->base_priority = new_thread->attr.prio;
}
new_thread->active_priority = new_thread->base_priority;
THREAD_LIST_LOCK;
/* Add the thread to the linked list of all threads: */
TAILQ_INSERT_HEAD(&_thread_list, new_thread, tle);
/*
* Create the thread.
*/
if (pattr->suspend == PTHREAD_CREATE_SUSPENDED)
new_thread->flags |= PTHREAD_FLAGS_SUSPENDED;
/* new thread inherits signal mask in kernel */
_thread_sigblock();
ret = thr_create(&new_thread->ctx, &new_thread->thr_id, flags);
/* restore my signal mask */
_thread_sigunblock();
if (ret != 0) {
_thread_printf(STDERR_FILENO, "thr_create() == %d\n", ret);
PANIC("thr_create");
}
THREAD_LIST_UNLOCK;
/* Return a pointer to the thread structure: */
(*thread) = new_thread;
return (0);
}
void
_thread_start(pthread_t td)
{
int ret;
/*
* for AMD64, we need to set fsbase by thread itself, before
* fsbase is set, we can not run any other code, for example
* signal code.
*/
_set_curthread(NULL, td, &ret);
/* restore signal mask inherited before */
__sys_sigprocmask(SIG_SETMASK, &td->savedsig, NULL);
if ((curthread->flags & PTHREAD_FLAGS_SUSPENDED) != 0)
_thread_suspend(curthread, NULL);
pthread_exit(curthread->start_routine(curthread->arg));
/* This point should never be reached. */
PANIC("Thread has resumed after exit");
}