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diff --git a/src/core/iomgr/closure.h b/src/core/iomgr/closure.h
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+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_CORE_IOMGR_CLOSURE_H
+#define GRPC_INTERNAL_CORE_IOMGR_CLOSURE_H
+
+#include <stddef.h>
+
+struct grpc_closure;
+typedef struct grpc_closure grpc_closure;
+
+typedef struct grpc_closure_list {
+  grpc_closure *head;
+  grpc_closure *tail;
+} grpc_closure_list;
+
+/** gRPC Callback definition.
+ *
+ * \param arg Arbitrary input.
+ * \param success An indication on the state of the iomgr. On false, cleanup
+ * actions should be taken (eg, shutdown). */
+typedef void (*grpc_iomgr_cb_func)(void *arg, int success,
+                                   grpc_closure_list *closure_list);
+
+/** A closure over a grpc_iomgr_cb_func. */
+struct grpc_closure {
+  /** Bound callback. */
+  grpc_iomgr_cb_func cb;
+
+  /** Arguments to be passed to "cb". */
+  void *cb_arg;
+
+  /** Internal. A boolean indication to "cb" on the state of the iomgr.
+   * For instance, closures created during a shutdown would have this field set
+   * to false. */
+  int success;
+
+  /**< Internal. Do not touch */
+  struct grpc_closure *next;
+};
+
+/** Initializes \a closure with \a cb and \a cb_arg. */
+void grpc_closure_init(grpc_closure *closure, grpc_iomgr_cb_func cb,
+                       void *cb_arg);
+
+#define GRPC_CLOSURE_LIST_INIT \
+  { NULL, NULL }
+
+void grpc_closure_list_add(grpc_closure_list *list, grpc_closure *closure,
+                           int success);
+void grpc_closure_list_run(grpc_closure_list *list);
+void grpc_closure_list_move(grpc_closure_list *src, grpc_closure_list *dst);
+int grpc_closure_list_empty(grpc_closure_list list);
+
+#endif /* GRPC_INTERNAL_CORE_IOMGR_CLOSURE_H */