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| -rw-r--r-- | include/scoreboard.h | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/include/scoreboard.h b/include/scoreboard.h new file mode 100644 index 0000000..0142aa9 --- /dev/null +++ b/include/scoreboard.h @@ -0,0 +1,256 @@ +/* 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. + */ + +/** + * @file scoreboard.h + * @brief Apache scoreboard library + */ + +#ifndef APACHE_SCOREBOARD_H +#define APACHE_SCOREBOARD_H + +#ifdef __cplusplus +extern "C" { +#endif + +#if APR_HAVE_SYS_TIME_H +#include <sys/time.h> +#include <sys/times.h> +#endif + +#include "ap_config.h" +#include "http_config.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 indices. 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; + +/* stuff which is worker specific */ +typedef struct worker_score worker_score; +struct worker_score { +#if APR_HAS_THREADS + apr_os_thread_t tid; +#endif + int thread_num; + /* 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 short conn_count; + apr_off_t conn_bytes; + unsigned long access_count; + apr_off_t bytes_served; + unsigned long my_access_count; + apr_off_t my_bytes_served; + apr_time_t start_time; + apr_time_t stop_time; + apr_time_t last_used; +#ifdef HAVE_TIMES + struct tms times; +#endif + char client[32]; /* DEPRECATED: Keep 'em small... */ + char request[64]; /* We just want an idea... */ + char vhost[32]; /* What virtual host is being accessed? */ + char protocol[16]; /* What protocol is used on the connection? */ + apr_time_t duration; + char client64[64]; +}; + +typedef struct { + int server_limit; + int thread_limit; + ap_generation_t running_generation; /* the generation of children which + * should still be serving requests. + */ + apr_time_t restart_time; +#ifdef HAVE_TIMES + struct tms times; +#endif +} 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 */ + char quiescing; /* the process whose pid is stored above is + * going down gracefully + */ + char not_accepting; /* the process is busy and is not accepting more + * connections (for async MPMs) + */ + apr_uint32_t connections; /* total connections (for async MPMs) */ + apr_uint32_t write_completion; /* async connections doing write completion */ + apr_uint32_t lingering_close; /* async connections in lingering close */ + apr_uint32_t keep_alive; /* async connections in keep alive */ + apr_uint32_t suspended; /* connections suspended by some module */ + int bucket; /* Listener bucket used by this child; this field is DEPRECATED + * and no longer updated by the MPMs (i.e. always zero). + */ +}; + +/* 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 indices into the (possibly relocated) shmem records. + */ +typedef struct { + global_score *global; + process_score *parent; + worker_score **servers; +} scoreboard; + +typedef struct ap_sb_handle_t ap_sb_handle_t; + +/* + * Creation and deletion (internal) + */ +int ap_create_scoreboard(apr_pool_t *p, ap_scoreboard_e t); +apr_status_t ap_cleanup_scoreboard(void *d); + +/* + * APIs for MPMs and other modules + */ +AP_DECLARE(int) ap_exists_scoreboard_image(void); +AP_DECLARE(void) ap_increment_counts(ap_sb_handle_t *sbh, request_rec *r); +AP_DECLARE(void) ap_set_conn_count(ap_sb_handle_t *sb, request_rec *r, unsigned short conn_count); + +AP_DECLARE(apr_status_t) ap_reopen_scoreboard(apr_pool_t *p, apr_shm_t **shm, int detached); +AP_DECLARE(void) ap_init_scoreboard(void *shared_score); +AP_DECLARE(int) ap_calc_scoreboard_size(void); + +AP_DECLARE(void) ap_create_sb_handle(ap_sb_handle_t **new_sbh, apr_pool_t *p, + int child_num, int thread_num); +AP_DECLARE(void) ap_update_sb_handle(ap_sb_handle_t *sbh, + int child_num, int thread_num); + +AP_DECLARE(int) ap_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); +AP_DECLARE(int) ap_update_child_status_from_conn(ap_sb_handle_t *sbh, int status, conn_rec *c); +AP_DECLARE(int) ap_update_child_status_from_server(ap_sb_handle_t *sbh, int status, + conn_rec *c, server_rec *s); +AP_DECLARE(int) ap_update_child_status_descr(ap_sb_handle_t *sbh, int status, const char *descr); + +AP_DECLARE(void) ap_time_process_request(ap_sb_handle_t *sbh, int status); + +AP_DECLARE(int) ap_update_global_status(void); + +AP_DECLARE(worker_score *) ap_get_scoreboard_worker(ap_sb_handle_t *sbh); + +/** Return a pointer to the worker_score for a given child, thread pair. + * @param child_num The child number. + * @param thread_num The thread number. + * @return A pointer to the worker_score structure. + * @deprecated This function is deprecated, use ap_copy_scoreboard_worker instead. */ +AP_DECLARE(worker_score *) ap_get_scoreboard_worker_from_indexes(int child_num, + int thread_num); + +/** Copy the contents of a worker scoreboard entry. The contents of + * the worker_score structure are copied verbatim into the dest + * structure. + * @param dest Output parameter. + * @param child_num The child number. + * @param thread_num The thread number. + */ +AP_DECLARE(void) ap_copy_scoreboard_worker(worker_score *dest, + int child_num, int thread_num); + +AP_DECLARE(process_score *) ap_get_scoreboard_process(int x); +AP_DECLARE(global_score *) ap_get_scoreboard_global(void); + +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 int ap_mod_status_reqtail; + +/* + * Command handlers [internal] + */ +const char *ap_set_scoreboard(cmd_parms *cmd, void *dummy, const char *arg); +const char *ap_set_extended_status(cmd_parms *cmd, void *dummy, int arg); +const char *ap_set_reqtail(cmd_parms *cmd, void *dummy, int arg); + +/* 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)) + +/* for time_process_request() in http_main.c */ +#define START_PREQUEST 1 +#define STOP_PREQUEST 2 + +#ifdef __cplusplus +} +#endif + +#endif /* !APACHE_SCOREBOARD_H */ |