1 files changed, 61 insertions, 0 deletions
diff --git a/libdimension/internal/future.h b/libdimension/internal/future.h
new file mode 100644
index 0000000..047523e
--- /dev/null
+++ b/libdimension/internal/future.h
@@ -0,0 +1,61 @@
+/*************************************************************************
+ * Copyright (C) 2010-2014 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.
+ */
+
+#ifndef DMNSN_INTERNAL_FUTURE_H
+#define DMNSN_INTERNAL_FUTURE_H
+
+#include <pthread.h>
+
+struct dmnsn_future {
+  size_t progress; ///< Completed loop iterations.
+  size_t total;    ///< Total expected loop iterations.
+
+  /// The worker thread.
+  pthread_t thread;
+
+  /// Mutex to guard progress and total.
+  pthread_mutex_t mutex;
+
+  /// Condition variable for waiting for a particular amount of progress.
+  pthread_cond_t cond;
+
+  /// Minimum waited-on value.
+  double min_wait;
+
+  /// Number of threads working on the future's background task.
+  unsigned int nthreads;
+  /// Number of threads not yet paused.
+  unsigned int nrunning;
+  /// Count of threads holding the future paused.
+  unsigned int npaused;
+  /// Condition variable for waiting for nrunning == 0.
+  pthread_cond_t none_running_cond;
+  /// Condition variable for waiting for nrunning == nthreads.
+  pthread_cond_t all_running_cond;
+  /// Condition variable for waiting for npaused == 0.
+  pthread_cond_t resume_cond;
+};
+
+#endif // DMNSN_INTERNAL_FUTURE_H