1 files changed, 69 insertions, 0 deletions
diff --git a/src/chain.h b/src/chain.h
new file mode 100644
index 00000000..2d5f0aae
--- /dev/null
+++ b/src/chain.h
@@ -0,0 +1,69 @@
+#ifndef __CHAIN_H__
+#define __CHAIN_H__
+
+/*
+ * Concomitant control chain (CCC)
+ * Theory and code by Jorge Arellano Cid <jcid@dillo.org>
+ */
+
+
+/*
+ * Supported CCC operations
+ */
+#define OpStart  1
+#define OpSend   2
+#define OpStop   3
+#define OpEnd    4
+#define OpAbort  5
+
+
+/*
+ * Linking direction
+ */
+#define FWD 1
+#define BCK 2
+
+
+typedef struct _ChainLink ChainLink;
+typedef struct _DataBuf DataBuf;
+typedef void (*ChainFunction_t)(int Op, int Branch, int Dir, ChainLink *Info,
+                                void *Data1, void *Data2);
+
+/* This is the main data structure for CCC nodes */
+struct _ChainLink {
+   void *LocalKey;
+
+   ChainLink *FcbInfo;
+   ChainFunction_t Fcb;
+   int FcbBranch;
+
+   ChainLink *BcbInfo;
+   ChainFunction_t Bcb;
+   int BcbBranch;
+};
+
+/* A convenience data structure for passing data chunks between nodes */
+struct _DataBuf {
+   char *Buf;
+   int Size;
+   int Code;
+};
+
+
+
+/*
+ * Function prototypes
+ */
+ChainLink *a_Chain_new(void);
+ChainLink *a_Chain_link_new(ChainLink *AInfo, ChainFunction_t AFunc,
+                            int Direction, ChainFunction_t BFunc,
+                            int AtoB_branch, int BtoA_branch);
+void a_Chain_unlink(ChainLink *Info, int Direction);
+int a_Chain_fcb(int Op, ChainLink *Info, void *Data1, void *Data2);
+int a_Chain_bcb(int Op, ChainLink *Info, void *Data1, void *Data2);
+
+DataBuf *a_Chain_dbuf_new(void *buf, int size, int code);
+void a_Chain_debug_msg(char *FuncStr, int Op, int Branch, int Dir);
+
+
+#endif /* __CHAIN_H__ */