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scoreboard.h
/* 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 in 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). */ apr_uint32_t wait_io; /* async connections waiting an IO in the MPM */ }; /* 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(void) ap_set_time_process_request(ap_sb_handle_t* const sbh, const apr_time_t timebeg,const apr_time_t timeend); 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 */
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