399 lines
11 KiB
C
399 lines
11 KiB
C
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/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "apr.h"
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#if APR_HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#if APR_HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#if APR_HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "apu.h"
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#include "apr_portable.h"
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#include "apr_thread_mutex.h"
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#include "apr_thread_cond.h"
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#include "apr_errno.h"
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#include "apr_queue.h"
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#if APR_HAS_THREADS
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/*
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* define this to get debug messages
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*
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#define QUEUE_DEBUG
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*/
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struct apr_queue_t {
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void **data;
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unsigned int nelts; /**< # elements */
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unsigned int in; /**< next empty location */
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unsigned int out; /**< next filled location */
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unsigned int bounds;/**< max size of queue */
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unsigned int full_waiters;
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unsigned int empty_waiters;
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apr_thread_mutex_t *one_big_mutex;
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apr_thread_cond_t *not_empty;
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apr_thread_cond_t *not_full;
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int terminated;
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};
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#ifdef QUEUE_DEBUG
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static void Q_DBG(char*msg, apr_queue_t *q) {
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fprintf(stderr, "%ld\t#%d in %d out %d\t%s\n",
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apr_os_thread_current(),
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q->nelts, q->in, q->out,
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msg
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);
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}
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#else
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#define Q_DBG(x,y)
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#endif
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/**
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* Detects when the apr_queue_t is full. This utility function is expected
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* to be called from within critical sections, and is not threadsafe.
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*/
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#define apr_queue_full(queue) ((queue)->nelts == (queue)->bounds)
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/**
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* Detects when the apr_queue_t is empty. This utility function is expected
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* to be called from within critical sections, and is not threadsafe.
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*/
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#define apr_queue_empty(queue) ((queue)->nelts == 0)
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/**
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* Callback routine that is called to destroy this
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* apr_queue_t when its pool is destroyed.
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*/
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static apr_status_t queue_destroy(void *data)
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{
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apr_queue_t *queue = data;
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/* Ignore errors here, we can't do anything about them anyway. */
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apr_thread_cond_destroy(queue->not_empty);
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apr_thread_cond_destroy(queue->not_full);
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apr_thread_mutex_destroy(queue->one_big_mutex);
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return APR_SUCCESS;
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}
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/**
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* Initialize the apr_queue_t.
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*/
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APU_DECLARE(apr_status_t) apr_queue_create(apr_queue_t **q,
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unsigned int queue_capacity,
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apr_pool_t *a)
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{
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apr_status_t rv;
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apr_queue_t *queue;
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queue = apr_palloc(a, sizeof(apr_queue_t));
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*q = queue;
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/* nested doesn't work ;( */
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rv = apr_thread_mutex_create(&queue->one_big_mutex,
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APR_THREAD_MUTEX_UNNESTED,
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a);
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if (rv != APR_SUCCESS) {
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return rv;
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}
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rv = apr_thread_cond_create(&queue->not_empty, a);
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if (rv != APR_SUCCESS) {
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return rv;
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}
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rv = apr_thread_cond_create(&queue->not_full, a);
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if (rv != APR_SUCCESS) {
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return rv;
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}
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/* Set all the data in the queue to NULL */
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queue->data = apr_pcalloc(a, queue_capacity * sizeof(void*));
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queue->bounds = queue_capacity;
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queue->nelts = 0;
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queue->in = 0;
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queue->out = 0;
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queue->terminated = 0;
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queue->full_waiters = 0;
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queue->empty_waiters = 0;
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apr_pool_cleanup_register(a, queue, queue_destroy, apr_pool_cleanup_null);
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return APR_SUCCESS;
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}
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/**
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* Push new data onto the queue. Blocks if the queue is full. Once
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* the push operation has completed, it signals other threads waiting
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* in apr_queue_pop() that they may continue consuming sockets.
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*/
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APU_DECLARE(apr_status_t) apr_queue_push(apr_queue_t *queue, void *data)
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{
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apr_status_t rv;
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if (queue->terminated) {
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return APR_EOF; /* no more elements ever again */
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}
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rv = apr_thread_mutex_lock(queue->one_big_mutex);
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if (rv != APR_SUCCESS) {
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return rv;
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}
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if (apr_queue_full(queue)) {
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if (!queue->terminated) {
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queue->full_waiters++;
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rv = apr_thread_cond_wait(queue->not_full, queue->one_big_mutex);
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queue->full_waiters--;
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if (rv != APR_SUCCESS) {
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apr_thread_mutex_unlock(queue->one_big_mutex);
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return rv;
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}
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}
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/* If we wake up and it's still empty, then we were interrupted */
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if (apr_queue_full(queue)) {
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Q_DBG("queue full (intr)", queue);
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rv = apr_thread_mutex_unlock(queue->one_big_mutex);
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if (rv != APR_SUCCESS) {
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return rv;
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}
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if (queue->terminated) {
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return APR_EOF; /* no more elements ever again */
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}
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else {
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return APR_EINTR;
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}
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}
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}
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queue->data[queue->in] = data;
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queue->in++;
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if (queue->in >= queue->bounds)
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queue->in -= queue->bounds;
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queue->nelts++;
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if (queue->empty_waiters) {
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Q_DBG("sig !empty", queue);
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rv = apr_thread_cond_signal(queue->not_empty);
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if (rv != APR_SUCCESS) {
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apr_thread_mutex_unlock(queue->one_big_mutex);
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return rv;
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}
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}
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rv = apr_thread_mutex_unlock(queue->one_big_mutex);
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return rv;
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}
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/**
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* Push new data onto the queue. If the queue is full, return APR_EAGAIN. If
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* the push operation completes successfully, it signals other threads
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* waiting in apr_queue_pop() that they may continue consuming sockets.
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*/
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APU_DECLARE(apr_status_t) apr_queue_trypush(apr_queue_t *queue, void *data)
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{
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apr_status_t rv;
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if (queue->terminated) {
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return APR_EOF; /* no more elements ever again */
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}
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rv = apr_thread_mutex_lock(queue->one_big_mutex);
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if (rv != APR_SUCCESS) {
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return rv;
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}
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if (apr_queue_full(queue)) {
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rv = apr_thread_mutex_unlock(queue->one_big_mutex);
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return APR_EAGAIN;
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}
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queue->data[queue->in] = data;
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queue->in++;
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if (queue->in >= queue->bounds)
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queue->in -= queue->bounds;
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queue->nelts++;
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if (queue->empty_waiters) {
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Q_DBG("sig !empty", queue);
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rv = apr_thread_cond_signal(queue->not_empty);
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if (rv != APR_SUCCESS) {
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apr_thread_mutex_unlock(queue->one_big_mutex);
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return rv;
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}
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}
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rv = apr_thread_mutex_unlock(queue->one_big_mutex);
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return rv;
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}
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/**
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* not thread safe
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*/
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APU_DECLARE(unsigned int) apr_queue_size(apr_queue_t *queue) {
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return queue->nelts;
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}
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/**
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* Retrieves the next item from the queue. If there are no
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* items available, it will block until one becomes available.
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* Once retrieved, the item is placed into the address specified by
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* 'data'.
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*/
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APU_DECLARE(apr_status_t) apr_queue_pop(apr_queue_t *queue, void **data)
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{
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apr_status_t rv;
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if (queue->terminated) {
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return APR_EOF; /* no more elements ever again */
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}
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rv = apr_thread_mutex_lock(queue->one_big_mutex);
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if (rv != APR_SUCCESS) {
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return rv;
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}
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/* Keep waiting until we wake up and find that the queue is not empty. */
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if (apr_queue_empty(queue)) {
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if (!queue->terminated) {
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queue->empty_waiters++;
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rv = apr_thread_cond_wait(queue->not_empty, queue->one_big_mutex);
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queue->empty_waiters--;
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if (rv != APR_SUCCESS) {
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apr_thread_mutex_unlock(queue->one_big_mutex);
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return rv;
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}
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}
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/* If we wake up and it's still empty, then we were interrupted */
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if (apr_queue_empty(queue)) {
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Q_DBG("queue empty (intr)", queue);
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rv = apr_thread_mutex_unlock(queue->one_big_mutex);
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if (rv != APR_SUCCESS) {
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return rv;
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}
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if (queue->terminated) {
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return APR_EOF; /* no more elements ever again */
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}
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else {
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return APR_EINTR;
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}
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}
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}
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*data = queue->data[queue->out];
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queue->nelts--;
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queue->out++;
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if (queue->out >= queue->bounds)
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queue->out -= queue->bounds;
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if (queue->full_waiters) {
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Q_DBG("signal !full", queue);
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rv = apr_thread_cond_signal(queue->not_full);
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if (rv != APR_SUCCESS) {
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apr_thread_mutex_unlock(queue->one_big_mutex);
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return rv;
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}
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}
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rv = apr_thread_mutex_unlock(queue->one_big_mutex);
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return rv;
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}
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/**
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* Retrieves the next item from the queue. If there are no
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* items available, return APR_EAGAIN. Once retrieved,
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* the item is placed into the address specified by 'data'.
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*/
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APU_DECLARE(apr_status_t) apr_queue_trypop(apr_queue_t *queue, void **data)
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{
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apr_status_t rv;
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if (queue->terminated) {
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return APR_EOF; /* no more elements ever again */
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}
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rv = apr_thread_mutex_lock(queue->one_big_mutex);
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if (rv != APR_SUCCESS) {
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return rv;
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}
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if (apr_queue_empty(queue)) {
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rv = apr_thread_mutex_unlock(queue->one_big_mutex);
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return APR_EAGAIN;
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}
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*data = queue->data[queue->out];
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queue->nelts--;
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queue->out++;
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if (queue->out >= queue->bounds)
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queue->out -= queue->bounds;
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if (queue->full_waiters) {
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Q_DBG("signal !full", queue);
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rv = apr_thread_cond_signal(queue->not_full);
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if (rv != APR_SUCCESS) {
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apr_thread_mutex_unlock(queue->one_big_mutex);
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return rv;
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}
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}
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rv = apr_thread_mutex_unlock(queue->one_big_mutex);
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return rv;
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}
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APU_DECLARE(apr_status_t) apr_queue_interrupt_all(apr_queue_t *queue)
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{
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apr_status_t rv;
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Q_DBG("intr all", queue);
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if ((rv = apr_thread_mutex_lock(queue->one_big_mutex)) != APR_SUCCESS) {
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return rv;
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}
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apr_thread_cond_broadcast(queue->not_empty);
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apr_thread_cond_broadcast(queue->not_full);
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if ((rv = apr_thread_mutex_unlock(queue->one_big_mutex)) != APR_SUCCESS) {
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return rv;
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}
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return APR_SUCCESS;
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}
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APU_DECLARE(apr_status_t) apr_queue_term(apr_queue_t *queue)
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{
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apr_status_t rv;
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if ((rv = apr_thread_mutex_lock(queue->one_big_mutex)) != APR_SUCCESS) {
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return rv;
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||
|
|
}
|
||
|
|
|
||
|
|
/* we must hold one_big_mutex when setting this... otherwise,
|
||
|
|
* we could end up setting it and waking everybody up just after a
|
||
|
|
* would-be popper checks it but right before they block
|
||
|
|
*/
|
||
|
|
queue->terminated = 1;
|
||
|
|
if ((rv = apr_thread_mutex_unlock(queue->one_big_mutex)) != APR_SUCCESS) {
|
||
|
|
return rv;
|
||
|
|
}
|
||
|
|
return apr_queue_interrupt_all(queue);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* APR_HAS_THREADS */
|