lib: Add call to reserve blocks in rdrbuff

This adds a call ipcp_sdb_reserve to reserve memory in the rdrbuff
without directly writing to a flow. The ipcp_flow_del function was
renamed to ipcp_sdb_release. The functions operating on sdbs are moved
to their own header.

1 files changed, 53 insertions, 0 deletions

diff --git a/include/ouroboros/shm_du_buff.h b/include/ouroboros/shm_du_buff.h
new file mode 100644
index 00000000..9f796be1
--- /dev/null
+++ b/include/ouroboros/shm_du_buff.h
@@ -0,0 +1,53 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Data Buffer element in Random Deletion Ring Buffer
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@ugent.be>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This 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 library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef OUROBOROS_SHM_DU_BUFF_H
+#define OUROBOROS_SHM_DU_BUFF_H
+
+#include <sys/types.h>
+#include <stdint.h>
+
+struct shm_du_buff;
+
+size_t    shm_du_buff_get_idx(struct shm_du_buff * sdb);
+
+uint8_t * shm_du_buff_head(struct shm_du_buff * sdb);
+
+uint8_t * shm_du_buff_tail(struct shm_du_buff * sdb);
+
+uint8_t * shm_du_buff_head_alloc(struct shm_du_buff * sdb,
+                                 size_t               size);
+
+uint8_t * shm_du_buff_tail_alloc(struct shm_du_buff * sdb,
+                                 size_t               size);
+
+void      shm_du_buff_head_release(struct shm_du_buff * sdb,
+                                   size_t               size);
+
+void      shm_du_buff_tail_release(struct shm_du_buff * sdb,
+                                   size_t               size);
+
+void      shm_du_buff_truncate(struct shm_du_buff * sdb,
+                               size_t               len);
+
+#endif /* OUROBOROS_SHM_DU_BUFF_H */