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1325 |
phoenix |
/* vi: set sw=4 ts=4: */
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/*
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* A _very_ simple clone based pthread-like implementation
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*
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* Copyright (C) 2001,2002 by Erik Andersen <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Library General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdlib.h>
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#include <sched.h>
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#include <signal.h>
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#include <errno.h>
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#include <unistd.h>
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#include <pthread.h>
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#define STACKSIZE 8096
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#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
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#define CLONE_VM 0x00000100 /* set if VM shared between processes */
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#define CLONE_FS 0x00000200 /* set if fs info shared between proces ses */
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#define CLONE_FILES 0x00000400 /* set if open files shared between pro cesses */
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#define CLONE_SIGHAND 0x00000800 /* set if signal handlers shared */
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/* Lame home-grown clone based threading */
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int pthread_mutex_init (pthread_mutex_t *mutex, const pthread_mutexattr_t *mutex_attr)
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{
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mutex->__m_lock.__spinlock = 1;
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return 0;
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}
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int pthread_mutex_lock (pthread_mutex_t *mutex)
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{
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while (mutex->__m_lock.__spinlock == 0) {
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usleep(10000);
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}
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--(mutex->__m_lock.__spinlock);
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return 0;
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}
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int pthread_mutex_unlock (pthread_mutex_t *mutex)
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{
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++(mutex->__m_lock.__spinlock);
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return 0;
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}
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int pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex)
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{
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++(mutex->__m_lock.__spinlock);
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while (cond->__c_lock.__spinlock == 0) {
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usleep(10000);
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}
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--(cond->__c_lock.__spinlock);
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return 0;
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}
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int pthread_cond_signal(pthread_cond_t *cond)
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{
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++(cond->__c_lock.__spinlock);
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return 0;
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}
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int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *cond_attr)
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{
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cond->__c_lock.__spinlock = 1;
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return 0;
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}
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int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void* (*fn)(void *), void *data)
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{
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long retval;
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void **newstack;
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int (*clonefunc)(void *) = (int (*)(void *))(fn);
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newstack = (void **) malloc(STACKSIZE);
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if (!newstack)
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return -1;
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newstack = (void **) (STACKSIZE + (char *) newstack);
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*--newstack = data;
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retval = clone(clonefunc, newstack,
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CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | SIGCHLD, data);
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if (retval < 0) {
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errno = -retval;
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*thread = 0;
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retval = -1;
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} else {
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*thread = retval;
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retval = 0;
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}
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return retval;
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}
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int pthread_join (pthread_t thread, void **thread_return)
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{
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int retval;
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/* Fixme -- wait for thread and get its return value */
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retval = EXIT_SUCCESS;
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if (thread_return)
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(int)*thread_return = retval;
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_exit(retval);
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}
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link_warning(pthread_join, "pthread_join is a stub and does not behave properly");
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void pthread_exit (void *retval)
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{
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_exit(*(int *)retval);
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}
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