| /* 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_mplx__ |
| #define __mod_h2__h2_mplx__ |
| |
| /** |
| * The stream multiplexer. It pushes buckets from the connection |
| * thread to the stream threads and vice versa. It's thread-safe |
| * to use. |
| * |
| * There is one h2_mplx instance for each h2_session, which sits on top |
| * of a particular httpd conn_rec. Input goes from the connection to |
| * the stream tasks. Output goes from the stream tasks to the connection, |
| * e.g. the client. |
| * |
| * For each stream, there can be at most "H2StreamMaxMemSize" output bytes |
| * queued in the multiplexer. If a task thread tries to write more |
| * data, it is blocked until space becomes available. |
| * |
| * Writing input is never blocked. In order to use flow control on the input, |
| * the mplx can be polled for input data consumption. |
| */ |
| |
| struct apr_pool_t; |
| struct apr_thread_mutex_t; |
| struct apr_thread_cond_t; |
| struct h2_bucket_beam; |
| struct h2_config; |
| struct h2_ihash_t; |
| struct h2_task; |
| struct h2_stream; |
| struct h2_request; |
| struct apr_thread_cond_t; |
| struct h2_workers; |
| struct h2_iqueue; |
| |
| #include <apr_queue.h> |
| |
| typedef struct h2_mplx h2_mplx; |
| |
| struct h2_mplx { |
| long id; |
| conn_rec *c; |
| apr_pool_t *pool; |
| server_rec *s; /* server for master conn */ |
| |
| unsigned int event_pending; |
| unsigned int aborted; |
| unsigned int is_registered; /* is registered at h2_workers */ |
| |
| struct h2_ihash_t *streams; /* all streams currently processing */ |
| struct h2_ihash_t *shold; /* all streams done with task ongoing */ |
| struct h2_ihash_t *spurge; /* all streams done, ready for destroy */ |
| |
| struct h2_iqueue *q; /* all stream ids that need to be started */ |
| struct h2_ififo *readyq; /* all stream ids ready for output */ |
| |
| struct h2_ihash_t *redo_tasks; /* all tasks that need to be redone */ |
| |
| int max_streams; /* max # of concurrent streams */ |
| int max_stream_started; /* highest stream id that started processing */ |
| int tasks_active; /* # of tasks being processed from this mplx */ |
| int limit_active; /* current limit on active tasks, dynamic */ |
| int max_active; /* max, hard limit # of active tasks in a process */ |
| |
| apr_time_t last_mood_change; /* last time, we worker limit changed */ |
| apr_interval_time_t mood_update_interval; /* how frequent we update at most */ |
| int irritations_since; /* irritations (>0) or happy events (<0) since last mood change */ |
| |
| apr_thread_mutex_t *lock; |
| struct apr_thread_cond_t *added_output; |
| struct apr_thread_cond_t *join_wait; |
| |
| apr_size_t stream_max_mem; |
| |
| apr_pool_t *spare_io_pool; |
| apr_array_header_t *spare_slaves; /* spare slave connections */ |
| |
| struct h2_workers *workers; |
| }; |
| |
| |
| |
| /******************************************************************************* |
| * Object lifecycle and information. |
| ******************************************************************************/ |
| |
| apr_status_t h2_mplx_child_init(apr_pool_t *pool, server_rec *s); |
| |
| /** |
| * Create the multiplexer for the given HTTP2 session. |
| * Implicitly has reference count 1. |
| */ |
| h2_mplx *h2_mplx_create(conn_rec *c, server_rec *s, apr_pool_t *master, |
| struct h2_workers *workers); |
| |
| /** |
| * Decreases the reference counter of this mplx and waits for it |
| * to reached 0, destroy the mplx afterwards. |
| * This is to be called from the thread that created the mplx in |
| * the first place. |
| * @param m the mplx to be released and destroyed |
| * @param wait condition var to wait on for ref counter == 0 |
| */ |
| void h2_mplx_release_and_join(h2_mplx *m, struct apr_thread_cond_t *wait); |
| |
| apr_status_t h2_mplx_pop_task(h2_mplx *m, struct h2_task **ptask); |
| |
| void h2_mplx_task_done(h2_mplx *m, struct h2_task *task, struct h2_task **ptask); |
| |
| /** |
| * Shut down the multiplexer gracefully. Will no longer schedule new streams |
| * but let the ongoing ones finish normally. |
| * @return the highest stream id being/been processed |
| */ |
| int h2_mplx_shutdown(h2_mplx *m); |
| |
| int h2_mplx_is_busy(h2_mplx *m); |
| |
| /******************************************************************************* |
| * IO lifetime of streams. |
| ******************************************************************************/ |
| |
| struct h2_stream *h2_mplx_stream_get(h2_mplx *m, int id); |
| |
| /** |
| * Notifies mplx that a stream has been completely handled on the main |
| * connection and is ready for cleanup. |
| * |
| * @param m the mplx itself |
| * @param stream the stream ready for cleanup |
| */ |
| apr_status_t h2_mplx_stream_cleanup(h2_mplx *m, struct h2_stream *stream); |
| |
| /** |
| * Waits on output data from any stream in this session to become available. |
| * Returns APR_TIMEUP if no data arrived in the given time. |
| */ |
| apr_status_t h2_mplx_out_trywait(h2_mplx *m, apr_interval_time_t timeout, |
| struct apr_thread_cond_t *iowait); |
| |
| apr_status_t h2_mplx_keep_active(h2_mplx *m, struct h2_stream *stream); |
| |
| /******************************************************************************* |
| * Stream processing. |
| ******************************************************************************/ |
| |
| /** |
| * Process a stream request. |
| * |
| * @param m the multiplexer |
| * @param stream the identifier of the stream |
| * @param r the request to be processed |
| * @param cmp the stream priority compare function |
| * @param ctx context data for the compare function |
| */ |
| apr_status_t h2_mplx_process(h2_mplx *m, struct h2_stream *stream, |
| h2_stream_pri_cmp *cmp, void *ctx); |
| |
| /** |
| * Stream priorities have changed, reschedule pending requests. |
| * |
| * @param m the multiplexer |
| * @param cmp the stream priority compare function |
| * @param ctx context data for the compare function |
| */ |
| apr_status_t h2_mplx_reprioritize(h2_mplx *m, h2_stream_pri_cmp *cmp, void *ctx); |
| |
| typedef apr_status_t stream_ev_callback(void *ctx, struct h2_stream *stream); |
| |
| /** |
| * Check if the multiplexer has events for the master connection pending. |
| * @return != 0 iff there are events pending |
| */ |
| int h2_mplx_has_master_events(h2_mplx *m); |
| |
| /** |
| * Dispatch events for the master connection, such as |
| ± @param m the multiplexer |
| * @param on_resume new output data has arrived for a suspended stream |
| * @param ctx user supplied argument to invocation. |
| */ |
| apr_status_t h2_mplx_dispatch_master_events(h2_mplx *m, |
| stream_ev_callback *on_resume, |
| void *ctx); |
| |
| int h2_mplx_awaits_data(h2_mplx *m); |
| |
| typedef int h2_mplx_stream_cb(struct h2_stream *s, void *ctx); |
| |
| apr_status_t h2_mplx_stream_do(h2_mplx *m, h2_mplx_stream_cb *cb, void *ctx); |
| |
| apr_status_t h2_mplx_client_rst(h2_mplx *m, int stream_id); |
| |
| /******************************************************************************* |
| * Output handling of streams. |
| ******************************************************************************/ |
| |
| /** |
| * Opens the output for the given stream with the specified response. |
| */ |
| apr_status_t h2_mplx_out_open(h2_mplx *mplx, int stream_id, |
| struct h2_bucket_beam *beam); |
| |
| /******************************************************************************* |
| * h2_mplx list Manipulation. |
| ******************************************************************************/ |
| |
| /** |
| * The magic pointer value that indicates the head of a h2_mplx list |
| * @param b The mplx list |
| * @return The magic pointer value |
| */ |
| #define H2_MPLX_LIST_SENTINEL(b) APR_RING_SENTINEL((b), h2_mplx, link) |
| |
| /** |
| * Determine if the mplx list is empty |
| * @param b The list to check |
| * @return true or false |
| */ |
| #define H2_MPLX_LIST_EMPTY(b) APR_RING_EMPTY((b), h2_mplx, link) |
| |
| /** |
| * Return the first mplx in a list |
| * @param b The list to query |
| * @return The first mplx in the list |
| */ |
| #define H2_MPLX_LIST_FIRST(b) APR_RING_FIRST(b) |
| |
| /** |
| * Return the last mplx in a list |
| * @param b The list to query |
| * @return The last mplx int he list |
| */ |
| #define H2_MPLX_LIST_LAST(b) APR_RING_LAST(b) |
| |
| /** |
| * Insert a single mplx at the front of a list |
| * @param b The list to add to |
| * @param e The mplx to insert |
| */ |
| #define H2_MPLX_LIST_INSERT_HEAD(b, e) do { \ |
| h2_mplx *ap__b = (e); \ |
| APR_RING_INSERT_HEAD((b), ap__b, h2_mplx, link); \ |
| } while (0) |
| |
| /** |
| * Insert a single mplx at the end of a list |
| * @param b The list to add to |
| * @param e The mplx to insert |
| */ |
| #define H2_MPLX_LIST_INSERT_TAIL(b, e) do { \ |
| h2_mplx *ap__b = (e); \ |
| APR_RING_INSERT_TAIL((b), ap__b, h2_mplx, link); \ |
| } while (0) |
| |
| /** |
| * Get the next mplx in the list |
| * @param e The current mplx |
| * @return The next mplx |
| */ |
| #define H2_MPLX_NEXT(e) APR_RING_NEXT((e), link) |
| /** |
| * Get the previous mplx in the list |
| * @param e The current mplx |
| * @return The previous mplx |
| */ |
| #define H2_MPLX_PREV(e) APR_RING_PREV((e), link) |
| |
| /** |
| * Remove a mplx from its list |
| * @param e The mplx to remove |
| */ |
| #define H2_MPLX_REMOVE(e) APR_RING_REMOVE((e), link) |
| |
| /******************************************************************************* |
| * h2_mplx DoS protection |
| ******************************************************************************/ |
| |
| /** |
| * Master connection has entered idle mode. |
| * @param m the mplx instance of the master connection |
| * @return != SUCCESS iff connection should be terminated |
| */ |
| apr_status_t h2_mplx_idle(h2_mplx *m); |
| |
| #endif /* defined(__mod_h2__h2_mplx__) */ |