012dfd00b3
Submitted by: john birrel One version of the pthreads library another will follow with differnt actions under some cases.. not QUITE complete
125 lines
3.4 KiB
C
125 lines
3.4 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 <stdio.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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void
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_thread_queue_init(struct pthread_queue * queue)
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{
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/* Initialise the pointers in the queue structure: */
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queue->q_next = NULL;
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queue->q_last = NULL;
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queue->q_data = NULL;
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return;
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}
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void
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_thread_queue_enq(struct pthread_queue * queue, struct pthread * thread)
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{
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if (queue->q_last) {
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queue->q_last->qnxt = thread;
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} else {
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queue->q_next = thread;
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}
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queue->q_last = thread;
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thread->queue = queue;
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thread->qnxt = NULL;
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return;
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}
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struct pthread *
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_thread_queue_get(struct pthread_queue * queue)
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{
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/* Return the pointer to the next thread in the queue: */
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return (queue->q_next);
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}
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struct pthread *
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_thread_queue_deq(struct pthread_queue * queue)
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{
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struct pthread *thread = NULL;
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if (queue->q_next) {
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thread = queue->q_next;
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if (!(queue->q_next = queue->q_next->qnxt)) {
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queue->q_last = NULL;
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}
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thread->queue = NULL;
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thread->qnxt = NULL;
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}
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return (thread);
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}
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int
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_thread_queue_remove(struct pthread_queue * queue, struct pthread * thread)
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{
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struct pthread **current = &(queue->q_next);
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struct pthread *prev = NULL;
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int ret = -1;
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while (*current) {
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if (*current == thread) {
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if ((*current)->qnxt) {
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*current = (*current)->qnxt;
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} else {
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queue->q_last = prev;
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*current = NULL;
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}
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ret = 0;
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break;
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}
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prev = *current;
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current = &((*current)->qnxt);
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}
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thread->queue = NULL;
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thread->qnxt = NULL;
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return (ret);
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}
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int
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pthread_llist_remove(struct pthread ** llist, struct pthread * thread)
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{
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while (*llist) {
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if (*llist == thread) {
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*llist = thread->qnxt;
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return (0);
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}
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llist = &(*llist)->qnxt;
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}
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return (-1);
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}
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#endif
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