Add interface for performing long tasks in background, while giving a

progress indication.

2 files changed, 56 insertions, 2 deletions

diff --git a/libdimension/dimension/array.h b/libdimension/dimension/array.h
index 30a119d..5abdf48 100644
--- a/libdimension/dimension/array.h
+++ b/libdimension/dimension/array.h
@@ -48,10 +48,11 @@ void dmnsn_array_set(dmnsn_array *array, size_t i, const void *obj);
 
 void dmnsn_array_resize(dmnsn_array *array, size_t length);
 
-/* Thread-unsafe!  Don't give multiple threads the same raw pointer... */
+/* Manual locking */
+
 void *dmnsn_array_at(dmnsn_array *array, size_t i);
+void dmnsn_array_resize_unlocked(dmnsn_array *array, size_t length);
 
-/* Manual locking */
 void dmnsn_array_rdlock(const dmnsn_array *array);
 void dmnsn_array_wrlock(dmnsn_array *array);
 void dmnsn_array_unlock(const dmnsn_array *array);
diff --git a/libdimension/dimension/progress.h b/libdimension/dimension/progress.h
new file mode 100644
index 0000000..d436b5d
--- /dev/null
+++ b/libdimension/dimension/progress.h
@@ -0,0 +1,53 @@
+/*************************************************************************
+ * Copyright (C) 2008 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_PROGRESS_H
+#define DIMENSION_PROGRESS_H
+
+#include <pthread.h>
+
+/* A single element in an array for dmnsn_progress.  Progress of this item is
+   progress/total. */
+typedef struct {
+  unsigned int progress, total;
+} dmnsn_progress_element;
+
+typedef struct {
+  /* 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;
+} dmnsn_progress;
+
+dmnsn_progress *dmnsn_new_progress();
+void dmnsn_delete_progress(dmnsn_progress *progress);
+
+/* This joins the worker thread and returns it's integer return value in
+   addition to deleting `progress' */
+int dmnsn_finish_progress(dmnsn_progress *progress);
+
+double dmnsn_get_progress(const dmnsn_progress* progress);
+
+void dmnsn_new_progress_element(dmnsn_progress* progress, unsigned int total);
+void dmnsn_increment_progress(dmnsn_progress* progress);
+
+#endif /* DIMENSION_PROGRESS_H */