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/* 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_h2__h2_workers__
#define __mod_h2__h2_workers__
/* Thread pool specific to executing h2_tasks. Has a minimum and maximum
* number of workers it creates. Starts with minimum workers and adds
* some on load, reduces the number again when idle.
*
*/
struct apr_thread_mutex_t;
struct apr_thread_cond_t;
struct h2_mplx;
struct h2_request;
struct h2_task;
struct h2_fifo;
struct h2_slot;
typedef struct h2_workers h2_workers;
struct h2_workers {
server_rec *s;
apr_pool_t *pool;
int next_worker_id;
apr_uint32_t max_workers;
volatile apr_uint32_t min_workers; /* is changed during graceful shutdown */
volatile apr_interval_time_t max_idle_duration; /* is changed during graceful shutdown */
volatile int aborted;
volatile int shutdown;
int dynamic;
apr_threadattr_t *thread_attr;
int nslots;
struct h2_slot *slots;
volatile apr_uint32_t worker_count;
struct h2_slot *free;
struct h2_slot *idle;
struct h2_slot *zombies;
struct h2_fifo *mplxs;
struct apr_thread_mutex_t *lock;
struct apr_thread_cond_t *all_done;
};
/* Create a worker pool with the given minimum and maximum number of
* threads.
*/
h2_workers *h2_workers_create(server_rec *s, apr_pool_t *pool,
int min_size, int max_size, int idle_secs);
/**
* Registers a h2_mplx for task scheduling. If this h2_mplx runs
* out of tasks, it will be automatically be unregistered. Should
* new tasks arrive, it needs to be registered again.
*/
apr_status_t h2_workers_register(h2_workers *workers, struct h2_mplx *m);
/**
* Remove a h2_mplx from the worker registry.
*/
apr_status_t h2_workers_unregister(h2_workers *workers, struct h2_mplx *m);
/**
* Shut down processing gracefully by terminating all idle workers.
*/
void h2_workers_graceful_shutdown(h2_workers *workers);
#endif /* defined(__mod_h2__h2_workers__) */
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