Documentation, use of liberror, and implement libaxl_deallocate_id

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 52 insertions, 0 deletions

diff --git a/libaxl_deallocate_id.c b/libaxl_deallocate_id.c
new file mode 100644
index 0000000..0a27de0
--- /dev/null
+++ b/libaxl_deallocate_id.c
@@ -0,0 +1,52 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+int
+libaxl_deallocate_id(LIBAXL_CONTEXT *ctx, libaxl_id_t id)
+{
+	LIBAXL_CONNECTION *conn = ctx->conn;
+	struct id_pool *pool = NULL, *node;
+	uint32_t inc = (uint32_t)1 << conn->xid_shift;
+	int ret = 0;
+
+	pool = atomic_exchange(&conn->xid_pool, pool);
+	if (pool) {
+		for (node = pool;; node = node->next) {
+			if (id + inc == node->first) {
+				node->first = id;
+				goto out;
+			} else if (node->last + inc == id) {
+				node->last = id;
+				goto out;
+			}
+			if (!node->next)
+				break;
+		}
+		node->next = liberror_malloc(sizeof(*node->next));
+		if (node->next) {
+			node->next->first = id;
+			node->next->last = id;
+			atomic_init(&node->next->next, NULL);
+		} else {
+			ret = -1;
+		}
+	} else {
+		pool = liberror_malloc(sizeof(*pool));
+		if (pool) {
+			pool->first = id;
+			pool->last = id;
+			atomic_init(&pool->next, NULL);
+		} else {
+			ret = -1;
+		}
+	}
+
+out:
+	while ((pool = atomic_exchange(&conn->xid_pool, pool))) {
+		for (node = pool; node->next; node = node->next);
+		node->next = atomic_exchange(&conn->xid_pool, NULL);
+	}
+
+	return ret;
+}
+