132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
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/*
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* Boa, an http server
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* Copyright (C) 1995 Paul Phillips <paulp@go2net.com>
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* Some changes Copyright (C) 1997 Jon Nelson <jnelson@boa.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 1, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/* $Id: queue.c,v 1.21 2002/01/21 02:19:16 jnelson Exp $*/
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#include "boa.h"
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request *request_ready = NULL; /* ready list head */
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request *request_block = NULL; /* blocked list head */
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request *request_free = NULL; /* free list head */
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/*
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* Name: block_request
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*
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* Description: Moves a request from the ready queue to the blocked queue
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*/
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void block_request(request * req)
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{
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dequeue(&request_ready, req);
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enqueue(&request_block, req);
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if (req->buffer_end) {
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BOA_FD_SET(req->fd, &block_write_fdset);
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} else {
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switch (req->status) {
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case WRITE:
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case PIPE_WRITE:
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case DONE:
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BOA_FD_SET(req->fd, &block_write_fdset);
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break;
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case PIPE_READ:
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BOA_FD_SET(req->data_fd, &block_read_fdset);
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break;
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case BODY_WRITE:
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BOA_FD_SET(req->post_data_fd, &block_write_fdset);
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break;
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default:
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BOA_FD_SET(req->fd, &block_read_fdset);
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break;
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}
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}
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}
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/*
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* Name: ready_request
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*
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* Description: Moves a request from the blocked queue to the ready queue
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*/
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void ready_request(request * req)
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{
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dequeue(&request_block, req);
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enqueue(&request_ready, req);
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if (req->buffer_end) {
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FD_CLR(req->fd, &block_write_fdset);
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} else {
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switch (req->status) {
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case WRITE:
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case PIPE_WRITE:
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case DONE:
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FD_CLR(req->fd, &block_write_fdset);
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break;
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case PIPE_READ:
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FD_CLR(req->data_fd, &block_read_fdset);
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break;
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case BODY_WRITE:
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FD_CLR(req->post_data_fd, &block_write_fdset);
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break;
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default:
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FD_CLR(req->fd, &block_read_fdset);
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}
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}
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}
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/*
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* Name: dequeue
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*
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* Description: Removes a request from its current queue
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*/
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void dequeue(request ** head, request * req)
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{
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if (*head == req)
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*head = req->next;
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if (req->prev)
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req->prev->next = req->next;
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if (req->next)
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req->next->prev = req->prev;
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req->next = NULL;
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req->prev = NULL;
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}
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/*
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* Name: enqueue
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*
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* Description: Adds a request to the head of a queue
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*/
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void enqueue(request ** head, request * req)
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{
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if (*head)
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(*head)->prev = req; /* previous head's prev is us */
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req->next = *head; /* our next is previous head */
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req->prev = NULL; /* first in list */
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*head = req; /* now we are head */
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}
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