diff options
Diffstat (limited to 'lib/libc_r/uthread/uthread_join.c')
| -rw-r--r-- | lib/libc_r/uthread/uthread_join.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/lib/libc_r/uthread/uthread_join.c b/lib/libc_r/uthread/uthread_join.c deleted file mode 100644 index c8f8441..0000000 --- a/lib/libc_r/uthread/uthread_join.c +++ /dev/null @@ -1,164 +0,0 @@ -/* - * Copyright (c) 1995 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. 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 "namespace.h" -#include <pthread.h> -#include "un-namespace.h" -#include "pthread_private.h" - -__weak_reference(_pthread_join, pthread_join); - -int -_pthread_join(pthread_t pthread, void **thread_return) -{ - struct pthread *curthread = _get_curthread(); - int ret = 0; - pthread_t thread; - - _thread_enter_cancellation_point(); - - /* Check if the caller has specified an invalid thread: */ - if (pthread == NULL || pthread->magic != PTHREAD_MAGIC) { - /* Invalid thread: */ - _thread_leave_cancellation_point(); - return(EINVAL); - } - - /* Check if the caller has specified itself: */ - if (pthread == curthread) { - /* Avoid a deadlock condition: */ - _thread_leave_cancellation_point(); - return(EDEADLK); - } - - /* - * Lock the garbage collector mutex to ensure that the garbage - * collector is not using the dead thread list. - */ - if (_pthread_mutex_lock(&_gc_mutex) != 0) - PANIC("Cannot lock gc mutex"); - - /* - * Defer signals to protect the thread list from access - * by the signal handler: - */ - _thread_kern_sig_defer(); - - /* - * Unlock the garbage collector mutex, now that the garbage collector - * can't be run: - */ - if (_pthread_mutex_unlock(&_gc_mutex) != 0) - PANIC("Cannot lock gc mutex"); - - /* - * Search for the specified thread in the list of active threads. This - * is done manually here rather than calling _find_thread() because - * the searches in _thread_list and _dead_list (as well as setting up - * join/detach state) have to be done atomically. - */ - TAILQ_FOREACH(thread, &_thread_list, tle) { - if (thread == pthread) - break; - } - if (thread == NULL) { - /* - * Search for the specified thread in the list of dead threads: - */ - TAILQ_FOREACH(thread, &_dead_list, dle) { - if (thread == pthread) - break; - } - } - - /* Check if the thread was not found or has been detached: */ - if (thread == NULL || - ((pthread->attr.flags & PTHREAD_DETACHED) != 0)) { - /* Undefer and handle pending signals, yielding if necessary: */ - _thread_kern_sig_undefer(); - - /* Return an error: */ - ret = ESRCH; - - } else if (pthread->joiner != NULL) { - /* Undefer and handle pending signals, yielding if necessary: */ - _thread_kern_sig_undefer(); - - /* Multiple joiners are not supported. */ - ret = ENOTSUP; - - /* Check if the thread is not dead: */ - } else if (pthread->state != PS_DEAD) { - /* Set the running thread to be the joiner: */ - pthread->joiner = curthread; - - /* Keep track of which thread we're joining to: */ - curthread->join_status.thread = pthread; - - while (curthread->join_status.thread == pthread) { - /* Schedule the next thread: */ - _thread_kern_sched_state(PS_JOIN, __FILE__, __LINE__); - } - - /* - * The thread return value and error are set by the thread we're - * joining to when it exits or detaches: - */ - ret = curthread->join_status.error; - if ((ret == 0) && (thread_return != NULL)) - *thread_return = curthread->join_status.ret; - - /* Undefer and handle pending signals, yielding if necessary: */ - _thread_kern_sig_undefer(); - } else { - /* - * The thread exited (is dead) without being detached, and no - * thread has joined it. - */ - - /* Check if the return value is required: */ - if (thread_return != NULL) { - /* Return the thread's return value: */ - *thread_return = pthread->ret; - } - - /* Make the thread collectable by the garbage collector. */ - pthread->attr.flags |= PTHREAD_DETACHED; - - /* Undefer and handle pending signals, yielding if necessary: */ - _thread_kern_sig_undefer(); - } - - _thread_leave_cancellation_point(); - - /* Return the completion status: */ - return (ret); -} |
