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diff --git a/modules/http2/h2_workers.h b/modules/http2/h2_workers.h
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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;
+    int min_workers;
+    int max_workers;
+    int max_idle_secs;
+    
+    int aborted;
+    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;
+};
+
+
+/* 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);
+
+#endif /* defined(__mod_h2__h2_workers__) */