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diff --git a/libdimension/future-impl.h b/libdimension/future-impl.h
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+/*************************************************************************
+ * Copyright (C) 2010-2011 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
+ * Future object implementation.
+ */
+
+#include <pthread.h>
+
+/** Allocate a new future object. */
+DMNSN_INTERNAL dmnsn_future *dmnsn_new_future(void);
+
+/** Set the total number of loop iterations. */
+DMNSN_INTERNAL void dmnsn_future_set_total(dmnsn_future *future, size_t total);
+/** Increment the progress of a background task. */
+DMNSN_INTERNAL void dmnsn_future_increment(dmnsn_future *future);
+/** Instantly complete the background teask. */
+DMNSN_INTERNAL void dmnsn_future_done(dmnsn_future *future);
+
+struct dmnsn_future {
+  size_t progress; /**< Completed loop iterations. */
+  size_t total;    /**< Total expected loop iterations. */
+
+  /** The worker thread. */
+  pthread_t thread;
+
+  /** Read-write synchronization. */
+  pthread_rwlock_t *rwlock;
+
+  /** Condition variable for waiting for a particular amount of progress. */
+  pthread_cond_t  *cond;
+  pthread_mutex_t *mutex;
+
+  /** Minimum waited-on value. */
+  double *min_wait;
+};