Adding upstream version 2.4.57.upstream/2.4.57

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 218 insertions, 0 deletions

diff --git a/modules/http2/h2_mplx.h b/modules/http2/h2_mplx.h
new file mode 100644
index 0000000..1f79aa8
--- /dev/null
+++ b/modules/http2/h2_mplx.h
@@ -0,0 +1,218 @@
+/* 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 performs communication between the
+ * primary HTTP/2 connection (c1) to the secondary connections (c2)
+ * that process the requests, aka. HTTP/2 streams.
+ *
+ * There is one h2_mplx instance for each h2_session.
+ *
+ * Naming Convention:
+ * "h2_mplx_c1_" are methods only to be called by the primary connection
+ * "h2_mplx_c2_" are methods only to be called by a secondary connection
+ * "h2_mplx_worker_" are methods only to be called by a h2 worker thread
+ */
+
+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_stream;
+struct h2_request;
+struct apr_thread_cond_t;
+struct h2_workers;
+struct h2_iqueue;
+
+#include <apr_queue.h>
+
+#include "h2_workers.h"
+
+typedef struct h2_c2_transit h2_c2_transit;
+
+struct h2_c2_transit {
+    apr_pool_t *pool;
+    apr_bucket_alloc_t *bucket_alloc;
+};
+
+typedef struct h2_mplx h2_mplx;
+
+struct h2_mplx {
+    int child_num;                  /* child this runs in */
+    apr_uint32_t id;                /* id unique per child */
+    conn_rec *c1;                   /* the main connection */
+    apr_pool_t *pool;
+    struct h2_stream *stream0;      /* HTTP/2's stream 0 */
+    server_rec *s;                  /* server for master conn */
+
+    int shutdown;                   /* we are shutting down */
+    int aborted;                    /* we need to get out of here asap */
+    int polling;                    /* is waiting/processing pollset events */
+    ap_conn_producer_t *producer;   /* registered producer at h2_workers */
+
+    struct h2_ihash_t *streams;     /* all streams active */
+    struct h2_ihash_t *shold;       /* all streams done with c2 processing ongoing */
+    apr_array_header_t *spurge;     /* all streams done, ready for destroy */
+    
+    struct h2_iqueue *q;            /* all stream ids that need to be started */
+
+    apr_size_t stream_max_mem;      /* max memory to buffer for a stream */
+    apr_uint32_t max_streams;       /* max # of concurrent streams */
+    apr_uint32_t max_stream_id_started; /* highest stream id that started processing */
+
+    apr_uint32_t processing_count;  /* # of c2 working for this mplx */
+    apr_uint32_t processing_limit;  /* current limit on processing c2s, dynamic */
+    apr_uint32_t processing_max;    /* max, hard limit of processing c2s */
+    
+    apr_time_t last_mood_change;    /* last time, processing limit changed */
+    apr_interval_time_t mood_update_interval; /* how frequent we update at most */
+    apr_uint32_t irritations_since; /* irritations (>0) or happy events (<0) since last mood change */
+
+    apr_thread_mutex_t *lock;
+    struct apr_thread_cond_t *join_wait;
+    
+    apr_pollset_t *pollset;         /* pollset for c1/c2 IO events */
+    apr_array_header_t *streams_ev_in;
+    apr_array_header_t *streams_ev_out;
+
+    apr_thread_mutex_t *poll_lock; /* protect modifications of queues below */
+    struct h2_iqueue *streams_input_read;  /* streams whose input has been read from */
+    struct h2_iqueue *streams_output_written; /* streams whose output has been written to */
+
+    struct h2_workers *workers;     /* h2 workers process wide instance */
+
+    request_rec *scratch_r;         /* pseudo request_rec for scoreboard reporting */
+
+    apr_uint32_t max_spare_transits; /* max number of transit pools idling */
+    apr_array_header_t *c2_transits; /* base pools for running c2 connections */
+};
+
+apr_status_t h2_mplx_c1_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_c1_create(int child_id, apr_uint32_t id,
+                           struct h2_stream *stream0,
+                           server_rec *s, apr_pool_t *master,
+                           struct h2_workers *workers);
+
+/**
+ * Destroy the mplx, shutting down all ongoing processing.
+ * @param m the mplx destroyed
+ * @param wait condition var to wait on for ref counter == 0
+ */ 
+void h2_mplx_c1_destroy(h2_mplx *m);
+
+/**
+ * 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_c1_shutdown(h2_mplx *m);
+
+/**
+ * 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
+ * @param pstream_count return the number of streams active
+ */
+apr_status_t h2_mplx_c1_stream_cleanup(h2_mplx *m, struct h2_stream *stream,
+                                       unsigned int *pstream_count);
+
+int h2_mplx_c1_stream_is_running(h2_mplx *m, struct h2_stream *stream);
+
+/**
+ * Process a stream request.
+ * 
+ * @param m the multiplexer
+ * @param read_to_process
+ * @param input_pending
+ * @param cmp the stream priority compare function
+ * @param pstream_count on return the number of streams active in mplx
+ */
+void h2_mplx_c1_process(h2_mplx *m,
+                        struct h2_iqueue *read_to_process,
+                        h2_stream_get_fn *get_stream,
+                        h2_stream_pri_cmp_fn *cmp,
+                        struct h2_session *session,
+                        unsigned int *pstream_count);
+
+/**
+ * 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_c1_reprioritize(h2_mplx *m, h2_stream_pri_cmp_fn *cmp,
+                                    struct h2_session *session);
+
+typedef void stream_ev_callback(void *ctx, struct h2_stream *stream);
+
+/**
+ * Poll the primary connection for input and the active streams for output.
+ * Invoke the callback for any stream where an event happened.
+ */
+apr_status_t h2_mplx_c1_poll(h2_mplx *m, apr_interval_time_t timeout,
+                            stream_ev_callback *on_stream_input,
+                            stream_ev_callback *on_stream_output,
+                            void *on_ctx);
+
+void h2_mplx_c2_input_read(h2_mplx *m, conn_rec *c2);
+void h2_mplx_c2_output_written(h2_mplx *m, conn_rec *c2);
+
+typedef int h2_mplx_stream_cb(struct h2_stream *s, void *userdata);
+
+/**
+ * Iterate over all streams known to mplx from the primary connection.
+ * @param m the mplx
+ * @param cb the callback to invoke on each stream
+ * @param ctx userdata passed to the callback
+ */
+apr_status_t h2_mplx_c1_streams_do(h2_mplx *m, h2_mplx_stream_cb *cb, void *ctx);
+
+/**
+ * A stream has been RST_STREAM by the client. Abort
+ * any processing going on and remove from processing
+ * queue.
+ */
+apr_status_t h2_mplx_c1_client_rst(h2_mplx *m, int stream_id);
+
+/**
+ * Get readonly access to a stream for a secondary connection.
+ */
+const struct h2_stream *h2_mplx_c2_stream_get(h2_mplx *m, int stream_id);
+
+/**
+ * A h2 worker asks for a secondary connection to process.
+ * @param out_c2 non-NULL, a pointer where to reveive the next
+ *               secondary connection to process.
+ */
+apr_status_t h2_mplx_worker_pop_c2(h2_mplx *m, conn_rec **out_c2);
+
+#define H2_MPLX_MSG(m, msg)     \
+    "h2_mplx(%d-%lu): "msg, m->child_num, (unsigned long)m->id
+
+#endif /* defined(__mod_h2__h2_mplx__) */