/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef FCGID_TABLE_H
#define FCGID_TABLE_H
#include <limits.h>
#include "httpd.h"
#include "apr_thread_proc.h"
#include "fcgid_global.h"

/* Increase it if necessary */
#define FCGID_MAX_APPLICATION (1024)

/* FCGID_MAX_APPLICATION + 4 list headers */
#define FCGID_PROC_TABLE_SIZE (FCGID_MAX_APPLICATION+4)

/*
    nNextIndex is for making a node list, there are four kind of list:
    1) free list: no process associate to this node
    2) busy list: a process is associated, and it's handling request
    3) idle list: a process is associated, and it's waiting request
    4) error list: a process is associated, and killing the process now
*/
typedef struct {
    int next_index;             /* the next array index in the list */
    apr_pool_t *proc_pool;      /* pool for process */
    apr_proc_t *proc_id;        /* the process id */
    char socket_path[_POSIX_PATH_MAX];  /* cgi application socket path */
    apr_ino_t inode;            /* cgi file inode */
    apr_dev_t deviceid;         /* cgi file device id */
    gid_t gid;                  /* for suEXEC */
    uid_t uid;                  /* for suEXEC */
    apr_size_t share_grp_id;    /* cgi wrapper share group id */
    const char *virtualhost;      /* the virtualhost this process belongs to */
    apr_time_t start_time;      /* the time of this process create */
    apr_time_t last_active_time;    /* the time this process last active */
    int requests_handled;       /* number of requests process has handled */
    char diewhy;                /* why it die */
} fcgid_procnode;

/* Macros for diewhy */
#define FCGID_DIE_KILLSELF  0
#define FCGID_DIE_IDLE_TIMEOUT 1
#define FCGID_DIE_LIFETIME_EXPIRED 2
#define FCGID_DIE_BUSY_TIMEOUT 3
#define FCGID_DIE_CONNECT_ERROR 4
#define FCGID_DIE_COMM_ERROR 5
#define FCGID_DIE_SHUTDOWN 6

typedef struct {
    int must_exit;              /* All processes using this share memory must exit */
} fcgid_global_share;

typedef struct {
    fcgid_global_share global;
    fcgid_procnode procnode_array[FCGID_PROC_TABLE_SIZE];
} fcgid_share;

apr_status_t proctable_child_init(server_rec * main_server,
                                  apr_pool_t * pchild);
apr_status_t proctable_post_config(server_rec * main_server,
                                   apr_pool_t * pconf);

apr_status_t proctable_lock_table(void);
apr_status_t proctable_unlock_table(void);

fcgid_procnode *proctable_get_free_list(void);
fcgid_procnode *proctable_get_busy_list(void);
fcgid_procnode *proctable_get_idle_list(void);
fcgid_procnode *proctable_get_error_list(void);
fcgid_procnode *proctable_get_table_array(void);
size_t proctable_get_table_size(void);
fcgid_global_share *proctable_get_globalshare(void);

void safe_lock(server_rec * main_server);
void safe_unlock(server_rec * main_server);

/* Just for debug */
void proctable_print_debug_info(server_rec * main_server);

#endif