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- /* Copyright 2001-2005 The Apache Software Foundation or its licensors, as
- * applicable.
- *
- * Licensed 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.
- */
-
- /**
- * @file scoreboard.h
- * @brief Apache scoreboard library
- */
-
- #ifndef APACHE_SCOREBOARD_H
- #define APACHE_SCOREBOARD_H
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- #ifdef HAVE_SYS_TIMES_H
- #include <sys/time.h>
- #include <sys/times.h>
- #elif defined(TPF)
- #include <time.h>
- #endif
-
- #include "ap_config.h"
- #include "apr_hooks.h"
- #include "apr_thread_proc.h"
- #include "apr_portable.h"
- #include "apr_shm.h"
- #include "apr_optional.h"
-
- /* Scoreboard file, if there is one */
- #ifndef DEFAULT_SCOREBOARD
- #define DEFAULT_SCOREBOARD "logs/apache_runtime_status"
- #endif
-
- /* Scoreboard info on a process is, for now, kept very brief ---
- * just status value and pid (the latter so that the caretaker process
- * can properly update the scoreboard when a process dies). We may want
- * to eventually add a separate set of long_score structures which would
- * give, for each process, the number of requests serviced, and info on
- * the current, or most recent, request.
- *
- * Status values:
- */
-
- #define SERVER_DEAD 0
- #define SERVER_STARTING 1 /* Server Starting up */
- #define SERVER_READY 2 /* Waiting for connection (or accept() lock) */
- #define SERVER_BUSY_READ 3 /* Reading a client request */
- #define SERVER_BUSY_WRITE 4 /* Processing a client request */
- #define SERVER_BUSY_KEEPALIVE 5 /* Waiting for more requests via keepalive */
- #define SERVER_BUSY_LOG 6 /* Logging the request */
- #define SERVER_BUSY_DNS 7 /* Looking up a hostname */
- #define SERVER_CLOSING 8 /* Closing the connection */
- #define SERVER_GRACEFUL 9 /* server is gracefully finishing request */
- #define SERVER_IDLE_KILL 10 /* Server is cleaning up idle children. */
- #define SERVER_NUM_STATUS 11 /* number of status settings */
-
- /* Type used for generation indicies. Startup and every restart cause a
- * new generation of children to be spawned. Children within the same
- * generation share the same configuration information -- pointers to stuff
- * created at config time in the parent are valid across children. However,
- * this can't work effectively with non-forked architectures. So while the
- * arrays in the scoreboard never change between the parent and forked
- * children, so they do not require shm storage, the contents of the shm
- * may contain no pointers.
- */
- typedef int ap_generation_t;
-
- /* Is the scoreboard shared between processes or not?
- * Set by the MPM when the scoreboard is created.
- */
- typedef enum {
- SB_NOT_SHARED = 1,
- SB_SHARED = 2
- } ap_scoreboard_e;
-
- #define SB_WORKING 0 /* The server is busy and the child is useful. */
- #define SB_IDLE_DIE 1 /* The server is idle and the child is superfluous. */
- /* The child should check for this and exit gracefully. */
-
- /* stuff which is worker specific */
- /***********************WARNING***************************************/
- /* These are things that are used by mod_status. Do not put anything */
- /* in here that you cannot live without. This structure will not */
- /* be available if mod_status is not loaded. */
- /*********************************************************************/
- typedef struct worker_score worker_score;
-
- struct worker_score {
- int thread_num;
- #if APR_HAS_THREADS
- apr_os_thread_t tid;
- #endif
- /* With some MPMs (e.g., worker), a worker_score can represent
- * a thread in a terminating process which is no longer
- * represented by the corresponding process_score. These MPMs
- * should set pid and generation fields in the worker_score.
- */
- pid_t pid;
- ap_generation_t generation;
- unsigned char status;
- unsigned long access_count;
- apr_off_t bytes_served;
- unsigned long my_access_count;
- apr_off_t my_bytes_served;
- apr_off_t conn_bytes;
- unsigned short conn_count;
- apr_time_t start_time;
- apr_time_t stop_time;
- #ifdef HAVE_TIMES
- struct tms times;
- #endif
- apr_time_t last_used;
- char client[32]; /* Keep 'em small... */
- char request[64]; /* We just want an idea... */
- char vhost[32]; /* What virtual host is being accessed? */
- };
-
- typedef struct {
- int server_limit;
- int thread_limit;
- ap_scoreboard_e sb_type;
- ap_generation_t running_generation; /* the generation of children which
- * should still be serving requests.
- */
- apr_time_t restart_time;
- int lb_limit;
- } global_score;
-
- /* stuff which the parent generally writes and the children rarely read */
- typedef struct process_score process_score;
- struct process_score{
- pid_t pid;
- ap_generation_t generation; /* generation of this child */
- ap_scoreboard_e sb_type;
- int quiescing; /* the process whose pid is stored above is
- * going down gracefully
- */
- };
-
- /* stuff which is lb specific */
- typedef struct lb_score lb_score;
- struct lb_score{
- /* TODO: make a real stuct from this */
- unsigned char data[1024];
- };
-
- /* Scoreboard is now in 'local' memory, since it isn't updated once created,
- * even in forked architectures. Child created-processes (non-fork) will
- * set up these indicies into the (possibly relocated) shmem records.
- */
- typedef struct {
- global_score *global;
- process_score *parent;
- worker_score **servers;
- lb_score *balancers;
- } scoreboard;
-
- typedef struct ap_sb_handle_t ap_sb_handle_t;
-
- AP_DECLARE(int) ap_exists_scoreboard_image(void);
- AP_DECLARE(void) ap_increment_counts(ap_sb_handle_t *sbh, request_rec *r);
-
- int ap_create_scoreboard(apr_pool_t *p, ap_scoreboard_e t);
- apr_status_t ap_reopen_scoreboard(apr_pool_t *p, apr_shm_t **shm, int detached);
- void ap_init_scoreboard(void *shared_score);
- AP_DECLARE(int) ap_calc_scoreboard_size(void);
- apr_status_t ap_cleanup_scoreboard(void *d);
-
- AP_DECLARE(void) ap_create_sb_handle(ap_sb_handle_t **new_sbh, apr_pool_t *p,
- int child_num, int thread_num);
-
- int find_child_by_pid(apr_proc_t *pid);
- AP_DECLARE(int) ap_update_child_status(ap_sb_handle_t *sbh, int status, request_rec *r);
- AP_DECLARE(int) ap_update_child_status_from_indexes(int child_num, int thread_num,
- int status, request_rec *r);
- void ap_time_process_request(ap_sb_handle_t *sbh, int status);
-
- AP_DECLARE(worker_score *) ap_get_scoreboard_worker(int x, int y);
- AP_DECLARE(process_score *) ap_get_scoreboard_process(int x);
- AP_DECLARE(global_score *) ap_get_scoreboard_global(void);
- AP_DECLARE(lb_score *) ap_get_scoreboard_lb(int lb_num);
-
- AP_DECLARE_DATA extern scoreboard *ap_scoreboard_image;
- AP_DECLARE_DATA extern const char *ap_scoreboard_fname;
- AP_DECLARE_DATA extern int ap_extended_status;
-
- AP_DECLARE_DATA extern ap_generation_t volatile ap_my_generation;
-
- /* Hooks */
- /**
- * Hook for post scoreboard creation, pre mpm.
- * @param p Apache pool to allocate from.
- * @param sb_type
- * @ingroup hooks
- * @return OK or DECLINE on success; anything else is a error
- */
- AP_DECLARE_HOOK(int, pre_mpm, (apr_pool_t *p, ap_scoreboard_e sb_type))
-
- /**
- * proxy load balancer
- * @return the number of load balancer workers.
- */
- APR_DECLARE_OPTIONAL_FN(int, ap_proxy_lb_workers,
- (void));
-
- /* for time_process_request() in http_main.c */
- #define START_PREQUEST 1
- #define STOP_PREQUEST 2
-
- #ifdef __cplusplus
- }
- #endif
-
- #endif /* !APACHE_SCOREBOARD_H */
-