1 /* ====================================================================
2 * The Apache Software License, Version 1.1
4 * Copyright (c) 2000-2001 The Apache Software Foundation. All rights
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
26 * 4. The names "Apache" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 * ====================================================================
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
54 * Portions of this software are based upon public domain software
55 * originally written at the National Center for Supercomputing Applications,
56 * University of Illinois, Urbana-Champaign.
59 #ifndef APACHE_SCOREBOARD_H
60 #define APACHE_SCOREBOARD_H
65 #ifdef HAVE_SYS_TIMES_H
67 #include <sys/times.h>
72 #include "mpm_default.h" /* For HARD_.*_LIMIT */
73 #include "apr_thread_proc.h"
74 #include "apr_portable.h"
76 /* Scoreboard info on a process is, for now, kept very brief ---
77 * just status value and pid (the latter so that the caretaker process
78 * can properly update the scoreboard when a process dies). We may want
79 * to eventually add a separate set of long_score structures which would
80 * give, for each process, the number of requests serviced, and info on
81 * the current, or most recent, request.
87 #define SERVER_STARTING 1 /* Server Starting up */
88 #define SERVER_READY 2 /* Waiting for connection (or accept() lock) */
89 #define SERVER_BUSY_READ 3 /* Reading a client request */
90 #define SERVER_BUSY_WRITE 4 /* Processing a client request */
91 #define SERVER_BUSY_KEEPALIVE 5 /* Waiting for more requests via keepalive */
92 #define SERVER_BUSY_LOG 6 /* Logging the request */
93 #define SERVER_BUSY_DNS 7 /* Looking up a hostname */
94 #define SERVER_GRACEFUL 8 /* server is gracefully finishing request */
95 #define SERVER_ACCEPTING 9 /* thread is accepting connections */
96 #define SERVER_QUEUEING 10 /* thread is putting connection on the queue */
97 #define SERVER_IDLE_KILL 11 /* Server is cleaning up idle children. */
98 #define SERVER_NUM_STATUS 12 /* number of status settings */
100 /* Type used for generation indicies. Startup and every restart cause a
101 * new generation of children to be spawned. Children within the same
102 * generation share the same configuration information -- pointers to stuff
103 * created at config time in the parent are valid across children. For
104 * example, the vhostrec pointer in the scoreboard below is valid in all
105 * children of the same generation.
107 * The safe way to access the vhost pointer is like this:
109 * worker_score *ss = pointer to whichver slot is interesting;
110 * process_score *ps = pointer to whichver slot is interesting;
111 * server_rec *vh = ss->vhostrec;
113 * if (ps->generation != ap_my_generation) {
117 * then if vh is not NULL it's valid in this child.
119 * This avoids various race conditions around restarts.
121 typedef int ap_generation_t;
123 /* Is the scoreboard shared between processes or not?
124 * Set by the MPM when the scoreboard is created.
131 #define SB_WORKING 0 /* The server is busy and the child is useful. */
132 #define SB_IDLE_DIE 1 /* The server is idle and the child is superfluous. */
133 /* The child should check for this and exit gracefully. */
135 /* stuff which is worker specific */
136 /***********************WARNING***************************************/
137 /* These are things that are used by mod_status. Do not put anything */
138 /* in here that you cannot live without. This structure will not */
139 /* be available if mod_status is not loaded. */
140 /*********************************************************************/
141 typedef struct worker_score worker_score;
143 struct worker_score {
148 unsigned char status;
149 unsigned long access_count;
150 unsigned long bytes_served;
151 unsigned long my_access_count;
152 unsigned long my_bytes_served;
153 unsigned long conn_bytes;
154 unsigned short conn_count;
155 apr_time_t start_time;
156 apr_time_t stop_time;
160 apr_time_t last_used;
161 char client[32]; /* Keep 'em small... */
162 char request[64]; /* We just want an idea... */
163 server_rec *vhostrec; /* What virtual host is being accessed? */
164 /* SEE ABOVE FOR SAFE USAGE! */
169 ap_scoreboard_e sb_type;
170 ap_generation_t running_generation; /* the generation of children which
171 * should still be serving requests. */
174 /* stuff which the parent generally writes and the children rarely read */
175 typedef struct process_score process_score;
176 struct process_score{
178 ap_generation_t generation; /* generation of this child */
179 ap_scoreboard_e sb_type;
180 unsigned short process_status; /* Either SB_WORKING or SB_IDLE_DIE */
182 worker_score *worker_head;
187 worker_score servers[HARD_SERVER_LIMIT][HARD_THREAD_LIMIT];
188 process_score parent[HARD_SERVER_LIMIT];
192 #define KEY_LENGTH 16
193 #define VALUE_LENGTH 64
195 char key[KEY_LENGTH];
196 char value[VALUE_LENGTH];
197 } status_table_entry;
199 #define SCOREBOARD_SIZE sizeof(scoreboard)
201 #define SCOREBOARD_NAME "SCOREBRD"
202 #define SCOREBOARD_FRAMES SCOREBOARD_SIZE/4095 + 1
205 AP_DECLARE(int) ap_exists_scoreboard_image(void);
206 AP_DECLARE(void) ap_create_scoreboard(apr_pool_t *p, ap_scoreboard_e t);
207 AP_DECLARE(void) ap_increment_counts(int child_num, int thread_num, request_rec *r);
209 apr_status_t ap_cleanup_scoreboard(void *d);
211 AP_DECLARE(void) reopen_scoreboard(apr_pool_t *p);
213 void ap_sync_scoreboard_image(void);
215 void update_scoreboard_global(void);
216 AP_DECLARE(int) find_child_by_pid(apr_proc_t *pid);
217 int ap_update_child_status(int child_num, int thread_num, int status, request_rec *r);
218 void ap_time_process_request(int child_num, int thread_num, int status);
221 AP_DECLARE_DATA extern scoreboard *ap_scoreboard_image;
222 AP_DECLARE_DATA extern const char *ap_scoreboard_fname;
223 AP_DECLARE_DATA extern int ap_extended_status;
224 AP_DECLARE_DATA extern apr_time_t ap_restart_time;
226 AP_DECLARE_DATA extern ap_generation_t volatile ap_my_generation;
228 /* for time_process_request() in http_main.c */
229 #define START_PREQUEST 1
230 #define STOP_PREQUEST 2
236 #endif /* !APACHE_SCOREBOARD_H */