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diff --git a/libdimension/progress-impl.h b/libdimension/progress-impl.h
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+/*************************************************************************
+ * Copyright (C) 2010 Tavian Barnes <tavianator@gmail.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/>.                                       *
+ *************************************************************************/
+
+#ifndef DIMENSION_IMPL_PROGRESS_H
+#define DIMENSION_IMPL_PROGRESS_H
+
+/* Allocate a new progress object */
+dmnsn_progress *dmnsn_new_progress(void);
+
+/* Create a new level of loop nesting */
+void dmnsn_new_progress_element(dmnsn_progress *progress, unsigned int total);
+/* Increment the progress counter; should only be called from innermost loop */
+void dmnsn_increment_progress(dmnsn_progress *progress);
+/* Instantly complete the progress */
+void dmnsn_done_progress(dmnsn_progress *progress);
+
+struct dmnsn_progress {
+  /* Array of progress elements.  Progress is given by P(0), where
+     P(i) = (elements[i].progress + P(i + 1))/elements[i].total. */
+  dmnsn_array *elements;
+
+  /* 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 */
+  volatile double min_wait;
+  volatile double *min_waitp; /* Hack for const values */
+};
+
+#endif /* DIMENSION_IMPL_PROGRESS_H */