ed92686917
threads from invalid ones. The pthread structure is opaque to the user so this change does not cause any incompatibilities. Hopefully this change will help code that was written for draft 4 fail gracefully if the programmer ignores the compiler warning about the change in the level of indirection for the argument passed to pthread_detach(). I got burnt, so I fixed then (expletive deleted) thing. These functions comply with the revised standard. That should shut Terry up!
304 lines
9.4 KiB
C
304 lines
9.4 KiB
C
/*
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* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/time.h>
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#ifdef _THREAD_SAFE
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#include <machine/reg.h>
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#include <pthread.h>
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#include "pthread_private.h"
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int
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_thread_create(pthread_t * thread, const pthread_attr_t * attr,
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void *(*start_routine) (void *), void *arg, pthread_t parent)
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{
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int i;
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int ret = 0;
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int status;
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pthread_t new_thread;
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pthread_attr_t pattr;
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void *stack;
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/* Block signals: */
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_thread_kern_sig_block(&status);
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/* Allocate memory for the thread structure: */
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if ((new_thread = (pthread_t) malloc(sizeof(struct pthread))) == NULL) {
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/* Insufficient memory to create a thread: */
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ret = EAGAIN;
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} else {
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/*
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* Write a magic value to the thread structure to help
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* identify valid ones:
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*/
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new_thread->magic = PTHREAD_MAGIC;
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/* Check if default thread attributes are required: */
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if (attr == NULL || *attr == NULL) {
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/* Use the default thread attributes: */
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pattr = &pthread_attr_default;
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} else {
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pattr = *attr;
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}
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/* Check if a stack was specified in the thread attributes: */
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if ((stack = pattr->stackaddr_attr) != NULL) {
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}
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/* Allocate memory for the stack: */
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else if ((stack = (void *) malloc(pattr->stacksize_attr)) == NULL) {
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/* Insufficient memory to create a thread: */
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ret = EAGAIN;
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free(new_thread);
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}
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/* Check for errors: */
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if (ret != 0) {
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} else {
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/* Initialise the thread structure: */
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memset(new_thread, 0, sizeof(struct pthread));
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new_thread->slice_usec = -1;
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new_thread->sig_saved = 0;
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new_thread->stack = stack;
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new_thread->start_routine = start_routine;
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new_thread->arg = arg;
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if (pattr->suspend == PTHREAD_CREATE_SUSPENDED) {
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PTHREAD_NEW_STATE(new_thread,PS_SUSPENDED);
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} else {
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PTHREAD_NEW_STATE(new_thread,PS_RUNNING);
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}
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/* Initialise the thread for signals: */
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new_thread->sigmask = _thread_run->sigmask;
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/*
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* Enter a loop to initialise the signal handler
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* array:
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*/
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for (i = 1; i < NSIG; i++) {
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/* Default the signal handler: */
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sigfillset(&new_thread->act[i - 1].sa_mask);
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new_thread->act[i - 1].sa_handler = _thread_run->act[i - 1].sa_handler;
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new_thread->act[i - 1].sa_flags = _thread_run->act[i - 1].sa_flags;
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}
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/* Initialise the jump buffer: */
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_thread_sys_setjmp(new_thread->saved_jmp_buf);
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/*
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* Set up new stack frame so that it looks like it
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* returned from a longjmp() to the beginning of
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* _thread_start(). Check if this is a user thread:
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*/
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if (parent == NULL) {
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/* Use the user start function: */
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#if defined(__FreeBSD__)
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#if defined(__alpha__)
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new_thread->saved_jmp_buf[0]._jb[2] = (long) _thread_start;
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new_thread->saved_jmp_buf[0]._jb[4 + R_RA] = 0;
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new_thread->saved_jmp_buf[0]._jb[4 + R_T12] = (long) _thread_start;
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#else
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new_thread->saved_jmp_buf[0]._jb[0] = (long) _thread_start;
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#endif
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#elif defined(__NetBSD__)
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#if defined(__alpha__)
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new_thread->saved_jmp_buf[2] = (long) _thread_start;
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new_thread->saved_jmp_buf[4 + R_RA] = 0;
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new_thread->saved_jmp_buf[4 + R_T12] = (long) _thread_start;
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#else
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new_thread->saved_jmp_buf[0] = (long) _thread_start;
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#endif
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#else
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#error "Don't recognize this operating system!"
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#endif
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} else {
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/*
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* Use the (funny) signal handler start
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* function:
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*/
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#if defined(__FreeBSD__)
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#if defined(__alpha__)
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new_thread->saved_jmp_buf[0]._jb[2] = (long) _thread_start_sig_handler;
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new_thread->saved_jmp_buf[0]._jb[4 + R_RA] = 0;
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new_thread->saved_jmp_buf[0]._jb[4 + R_T12] = (long) _thread_start_sig_handler;
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#else
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new_thread->saved_jmp_buf[0]._jb[0] = (int) _thread_start_sig_handler;
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#endif
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#elif defined(__NetBSD__)
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#if defined(__alpha__)
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new_thread->saved_jmp_buf[2] = (long) _thread_start_sig_handler;
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new_thread->saved_jmp_buf[4 + R_RA] = 0;
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new_thread->saved_jmp_buf[4 + R_T12] = (long) _thread_start_sig_handler;
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#else
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new_thread->saved_jmp_buf[0] = (long) _thread_start_sig_handler;
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#endif
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#else
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#error "Don't recognize this operating system!"
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#endif
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}
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/* The stack starts high and builds down: */
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#if defined(__FreeBSD__)
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#if defined(__alpha__)
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new_thread->saved_jmp_buf[0]._jb[4 + R_SP] = (long) new_thread->stack + pattr->stacksize_attr - sizeof(double);
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#else
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new_thread->saved_jmp_buf[0]._jb[2] = (int) (new_thread->stack + pattr->stacksize_attr - sizeof(double));
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#endif
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#elif defined(__NetBSD__)
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#if defined(__alpha__)
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new_thread->saved_jmp_buf[4 + R_SP] = (long) new_thread->stack + pattr->stacksize_attr - sizeof(double);
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#else
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new_thread->saved_jmp_buf[2] = (long) new_thread->stack + pattr->stacksize_attr - sizeof(double);
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#endif
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#else
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#error "Don't recognize this operating system!"
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#endif
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/* Copy the thread attributes: */
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memcpy(&new_thread->attr, pattr, sizeof(struct pthread_attr));
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/*
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* Check if this thread is to inherit the scheduling
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* attributes from its parent:
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*/
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if (new_thread->attr.flags & PTHREAD_INHERIT_SCHED) {
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/* Copy the scheduling attributes: */
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new_thread->pthread_priority = _thread_run->pthread_priority;
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new_thread->attr.prio = _thread_run->pthread_priority;
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new_thread->attr.schedparam_policy = _thread_run->attr.schedparam_policy;
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} else {
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/*
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* Use just the thread priority, leaving the
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* other scheduling attributes as their
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* default values:
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*/
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new_thread->pthread_priority = new_thread->attr.prio;
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}
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/* Initialise the join queue for the new thread: */
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_thread_queue_init(&(new_thread->join_queue));
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/* Initialise hooks in the thread structure: */
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new_thread->specific_data = NULL;
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new_thread->cleanup = NULL;
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new_thread->queue = NULL;
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new_thread->qnxt = NULL;
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new_thread->parent_thread = parent;
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new_thread->flags = 0;
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/* Add the thread to the linked list of all threads: */
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new_thread->nxt = _thread_link_list;
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_thread_link_list = new_thread;
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/* Return a pointer to the thread structure: */
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if(thread)
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(*thread) = new_thread;
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/* Check if a parent thread was specified: */
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if (parent != NULL) {
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/*
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* A parent thread was specified, so this is
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* a signal handler thread which must now
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* wait for the signal handler to complete:
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*/
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PTHREAD_NEW_STATE(parent,PS_SIGTHREAD);
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} else {
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/* Schedule the new user thread: */
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_thread_kern_sched(NULL);
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}
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}
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}
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/* Unblock signals: */
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_thread_kern_sig_unblock(status);
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/* Return the status: */
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return (ret);
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}
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int
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pthread_create(pthread_t * thread, const pthread_attr_t * attr,
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void *(*start_routine) (void *), void *arg)
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{
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int ret = 0;
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/*
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* Call the low level thread creation function which allows a parent
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* thread to be specified:
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*/
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ret = _thread_create(thread, attr, start_routine, arg, NULL);
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/* Return the status: */
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return (ret);
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}
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void
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_thread_start(void)
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{
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/* Run the current thread's start routine with argument: */
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pthread_exit(_thread_run->start_routine(_thread_run->arg));
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/* This point should never be reached. */
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PANIC("Thread has resumed after exit");
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}
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void
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_thread_start_sig_handler(void)
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{
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int sig;
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long arg;
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void (*sig_routine) (int);
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/*
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* Cast the argument from 'void *' to a variable that is NO SMALLER
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* than a pointer (otherwise gcc under NetBSD/Alpha will complain):
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*/
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arg = (long) _thread_run->arg;
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/* Cast the argument as a signal number: */
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sig = (int) arg;
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/* Cast a pointer to the signal handler function: */
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sig_routine = (void (*) (int)) _thread_run->start_routine;
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/* Call the signal handler function: */
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(*sig_routine) (sig);
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/* Exit the signal handler thread: */
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pthread_exit(&arg);
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/* This point should never be reached. */
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PANIC("Signal handler thread has resumed after exit");
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}
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#endif
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