reorgs, fetch batching (parallel fetch), orphans

include/nets/orphan_pool.h

@@ -0,0 +1,20 @@
+#ifndef ORPHAN_POOL_H
+#define ORPHAN_POOL_H
+
+#include <stdint.h>
+#include <block/block.h>
+#include <block/chain.h>
+
+// Initialize/destroy the global orphan pool
+void OrphanPool_Init(void);
+void OrphanPool_Destroy(void);
+
+// Insert an orphan block into the pool. Ownership of `block` is transferred to the pool.
+// `height` is the block number from the header.
+void OrphanPool_Insert(block_t* block, uint64_t height);
+
+// Attempt to attach any orphans whose parents now exist in `chain`.
+// Returns the number of blocks successfully attached.
+size_t OrphanPool_AttemptAttach(blockchain_t* chain);
+
+#endif