7285bccf1a
eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone
127 lines
4.0 KiB
C
127 lines
4.0 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <errno.h>
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#ifdef _THREAD_SAFE
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#include <pthread.h>
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#include "pthread_private.h"
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int
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pthread_join(pthread_t pthread, void **thread_return)
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{
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int ret = 0;
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pthread_t pthread1 = NULL;
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_thread_enter_cancellation_point();
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/* Check if the caller has specified an invalid thread: */
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if (pthread == NULL || pthread->magic != PTHREAD_MAGIC) {
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/* Invalid thread: */
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_thread_leave_cancellation_point();
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return(EINVAL);
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}
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/* Check if the caller has specified itself: */
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if (pthread == _thread_run) {
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/* Avoid a deadlock condition: */
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_thread_leave_cancellation_point();
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return(EDEADLK);
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}
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/*
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* Find the thread in the list of active threads or in the
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* list of dead threads:
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*/
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if (_find_thread(pthread) == 0 ||
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_find_dead_thread(pthread) == 0)
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pthread1 = pthread;
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if (pthread1 == NULL)
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/* Return an error: */
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ret = ESRCH;
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/* Check if this thread has been detached: */
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else if ((pthread->attr.flags & PTHREAD_DETACHED) != 0)
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/* Return an error: */
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ret = ESRCH;
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/* Check if the thread is not dead: */
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else if (pthread->state != PS_DEAD) {
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/* Clear the interrupted flag: */
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_thread_run->interrupted = 0;
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/*
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* Protect against being context switched out while
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* adding this thread to the join queue.
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*/
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_thread_kern_sig_defer();
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/* Add the running thread to the join queue: */
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TAILQ_INSERT_TAIL(&(pthread->join_queue), _thread_run, qe);
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/* Schedule the next thread: */
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_thread_kern_sched_state(PS_JOIN, __FILE__, __LINE__);
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if (_thread_run->interrupted != 0)
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TAILQ_REMOVE(&(pthread->join_queue), _thread_run, qe);
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_thread_kern_sig_undefer();
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if ((_thread_run->cancelflags & PTHREAD_CANCEL_NEEDED) != 0) {
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_thread_exit_cleanup();
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pthread_exit(PTHREAD_CANCELED);
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}
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/* Check if the thread is not detached: */
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if ((pthread->attr.flags & PTHREAD_DETACHED) == 0) {
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/* Check if the return value is required: */
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if (thread_return)
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/* Return the thread's return value: */
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*thread_return = pthread->ret;
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}
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else
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/* Return an error: */
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ret = ESRCH;
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/* Check if the return value is required: */
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} else if (thread_return != NULL)
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/* Return the thread's return value: */
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*thread_return = pthread->ret;
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_thread_leave_cancellation_point();
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/* Return the completion status: */
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return (ret);
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}
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#endif
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