*: initial commit

This is a simple allocator derived from the chunker in the
sparkler rototiller particle system module.

It's useful for pooling allocations of varying size with a
lot of churn.  It also gives a convenient way of discarding
all allocations through a reset mechanism obviating the need
for granular freeing, where applicable.

1 files changed, 27 insertions, 0 deletions

diff --git a/src/container.h b/src/container.h
new file mode 100644
index 0000000..c286074
--- /dev/null
+++ b/src/container.h
@@ -0,0 +1,27 @@
+/*
+ *  Copyright 2018 - Vito Caputo - <vcaputo@pengaru.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 3 as published
+ *  by the Free Software Foundation.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _CONTAINER_H
+#define _CONTAINER_H
+
+#include <stddef.h>
+
+#ifndef container_of
+#define container_of(_ptr, _type, _member) \
+	(_type *)((void *)(_ptr) - offsetof(_type, _member))
+#endif
+
+#endif