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diff --git a/libdimension/dimension/future.h b/libdimension/dimension/future.h
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+/*************************************************************************
+ * Copyright (C) 2009-2011 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library is distributed in the hope that it will be      *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * An interface for asynchronous tasks.  *_async() versions of functions
+ * return a dmnsn_future* object which can indicate the progress of the
+ * background task, and wait for task completion.  The task's return value
+ * is returned as an int from dmnsn_finish_progress().
+ */
+
+/** A future object. */
+typedef struct dmnsn_future dmnsn_future;
+
+/**
+ * Join the worker thread and return its integer return value in addition to
+ * deleting \p future.
+ * @param[in,out] future  The background task to join.
+ * @return The return value of the background task.
+ */
+int dmnsn_future_join(dmnsn_future *future);
+
+/**
+ * Interrupt the execution of a background thread.
+ * @param[in,out] future  The background task to cancel.
+ */
+void dmnsn_future_cancel(dmnsn_future *future);
+
+/**
+ * Get the progress of the background task.
+ * @param[in] future  The background task to examine.
+ * @return The progress of the background task, in [0.0, 1.0].
+ */
+double dmnsn_future_progress(const dmnsn_future *future);
+
+/**
+ * Wait for a certain amount of progress.  Always use this rather than
+ * spinlocking.
+ * @param[in] future    The background task to monitor.
+ * @param[in] progress  The progress value to wait for.
+ */
+void dmnsn_future_wait(const dmnsn_future *future, double progress);