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mod_watchdog.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. */ #ifndef MOD_WATCHDOG_H #define MOD_WATCHDOG_H /** * @file mod_watchdog.h * @brief Watchdog module for Apache * * @defgroup MOD_WATCHDOG mod_watchdog * @ingroup APACHE_MODS * @{ */ #include "httpd.h" #include "http_config.h" #include "http_log.h" #include "ap_provider.h" #include "apr.h" #include "apr_strings.h" #include "apr_pools.h" #include "apr_shm.h" #include "apr_hash.h" #include "apr_hooks.h" #include "apr_optional.h" #include "apr_file_io.h" #include "apr_time.h" #include "apr_thread_proc.h" #include "apr_global_mutex.h" #include "apr_thread_mutex.h" #ifdef __cplusplus extern "C" { #endif /** * Default singleton watchdog instance name. * Singleton watchdog is protected by mutex and * guaranteed to be run inside a single child process * at any time. */ #define AP_WATCHDOG_SINGLETON "_singleton_" /** * Default watchdog instance name */ #define AP_WATCHDOG_DEFAULT "_default_" /** * Default Watchdog interval */ #define AP_WD_TM_INTERVAL APR_TIME_C(1000000) /* 1 second */ /** * Watchdog thread timer resolution */ #define AP_WD_TM_SLICE APR_TIME_C(100000) /* 100 ms */ /* State values for callback */ #define AP_WATCHDOG_STATE_STARTING 1 #define AP_WATCHDOG_STATE_RUNNING 2 #define AP_WATCHDOG_STATE_STOPPING 3 typedef struct ap_watchdog_t ap_watchdog_t; /* Create a set of AP_WD_DECLARE(type), AP_WD_DECLARE_NONSTD(type) and * AP_WD_DECLARE_DATA with appropriate export and import tags for the platform */ #if !defined(AP_WD_DECLARE) #if !defined(WIN32) #define AP_WD_DECLARE(type) type #define AP_WD_DECLARE_NONSTD(type) type #define AP_WD_DECLARE_DATA #elif defined(AP_WD_DECLARE_STATIC) #define AP_WD_DECLARE(type) type __stdcall #define AP_WD_DECLARE_NONSTD(type) type #define AP_WD_DECLARE_DATA #elif defined(AP_WD_DECLARE_EXPORT) #define AP_WD_DECLARE(type) __declspec(dllexport) type __stdcall #define AP_WD_DECLARE_NONSTD(type) __declspec(dllexport) type #define AP_WD_DECLARE_DATA __declspec(dllexport) #else #define AP_WD_DECLARE(type) __declspec(dllimport) type __stdcall #define AP_WD_DECLARE_NONSTD(type) __declspec(dllimport) type #define AP_WD_DECLARE_DATA __declspec(dllimport) #endif #endif /** * Callback function used for watchdog. * @param state Watchdog state function. See @p AP_WATCHDOG_STATE_ . * @param data is what was passed to @p ap_watchdog_register_callback function. * @param pool Temporary callback pool destroyed after the call. * @return APR_SUCCESS to continue calling this callback. */ typedef apr_status_t ap_watchdog_callback_fn_t(int state, void *data, apr_pool_t *pool); /** * Get watchdog instance. * @param watchdog Storage for watchdog instance. * @param name Watchdog name. * @param parent Non-zero to get the parent process watchdog instance. * @param singleton Non-zero to get the singleton watchdog instance. * @param p The pool to use. * @return APR_SUCCESS if all went well * @remark Use @p AP_WATCHDOG_DEFAULT to get default watchdog instance. * If separate watchdog thread is needed provide unique name * and function will create a new watchdog instance. * Note that default client process watchdog works in singleton mode. */ APR_DECLARE_OPTIONAL_FN(apr_status_t, ap_watchdog_get_instance, (ap_watchdog_t **watchdog, const char *name, int parent, int singleton, apr_pool_t *p)); /** * Register watchdog callback. * @param watchdog Watchdog to use * @param interval Interval on which the callback function will execute. * @param callback The function to call on watchdog event. * @param data The data to pass to the callback function. * @return APR_SUCCESS if all went well. APR_EEXIST if already registered. */ APR_DECLARE_OPTIONAL_FN(apr_status_t, ap_watchdog_register_callback, (ap_watchdog_t *watchdog, apr_interval_time_t interval, const void *data, ap_watchdog_callback_fn_t *callback)); /** * Update registered watchdog callback interval. * @param w Watchdog to use * @param interval New interval on which the callback function will execute. * @param callback The function to call on watchdog event. * @param data The data to pass to the callback function. * @return APR_SUCCESS if all went well. APR_EOF if callback was not found. */ APR_DECLARE_OPTIONAL_FN(apr_status_t, ap_watchdog_set_callback_interval, (ap_watchdog_t *w, apr_interval_time_t interval, const void *data, ap_watchdog_callback_fn_t *callback)); /** * Watchdog require hook. * @param s The server record * @param name Watchdog name. * @param parent Non-zero to indicate the parent process watchdog mode. * @param singleton Non-zero to indicate the singleton watchdog mode. * @return OK to enable notifications from this watchdog, DECLINED otherwise. * @remark This is called in post config phase for all watchdog instances * that have no callbacks registered. Modules using this hook * should ensure that their post_config hook is called after watchdog * post_config. */ APR_DECLARE_EXTERNAL_HOOK(ap, AP_WD, int, watchdog_need, (server_rec *s, const char *name, int parent, int singleton)) /** * Watchdog initialize hook. * It is called after the watchdog thread is initialized. * @param s The server record * @param name Watchdog name. * @param pool The pool used to create the watchdog. */ APR_DECLARE_EXTERNAL_HOOK(ap, AP_WD, int, watchdog_init, ( server_rec *s, const char *name, apr_pool_t *pool)) /** * Watchdog terminate hook. * It is called when the watchdog thread is terminated. * @param s The server record * @param name Watchdog name. * @param pool The pool used to create the watchdog. */ APR_DECLARE_EXTERNAL_HOOK(ap, AP_WD, int, watchdog_exit, ( server_rec *s, const char *name, apr_pool_t *pool)) /** * Fixed interval watchdog hook. * It is called regularly on @p AP_WD_TM_INTERVAL interval. * @param s The server record * @param name Watchdog name. * @param pool Temporary pool destroyed after the call. */ APR_DECLARE_EXTERNAL_HOOK(ap, AP_WD, int, watchdog_step, ( server_rec *s, const char *name, apr_pool_t *pool)) #ifdef __cplusplus } #endif #endif /* MOD_WATCHDOG_H */ /** @} */
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