Establish native micro runtime checkpoint

1 files changed, 25 insertions, 0 deletions

diff --git a/prototypes/connections/flow.h b/prototypes/connections/flow.h
new file mode 100644
index 0000000..6e27c58
--- /dev/null
+++ b/prototypes/connections/flow.h
@@ -0,0 +1,25 @@
+#ifndef PURE_FLOW_H
+#define PURE_FLOW_H
+#include <stdbool.h>
+#include <stddef.h>
+
+typedef struct { const unsigned char *data; size_t size; } PureSpan;
+typedef void (*PureRelease)(void *owner);
+
+/* A borrowed body stays alive until every byte is consumed or the transfer is
+ * aborted. A successful send() consumes bytes; peer receipt is a separate fact.
+ * Single owner thread; callbacks must not reenter or reuse this transfer. */
+typedef struct {
+    PureSpan spans[2];
+    size_t part, offset;
+    void *owner;
+    PureRelease release;
+    bool active;
+} PureTransfer;
+
+void pure_transfer_init(PureTransfer *, PureSpan header, PureSpan body,
+                        void *owner, PureRelease);
+PureSpan pure_transfer_next(const PureTransfer *, size_t limit);
+bool pure_transfer_consume(PureTransfer *, size_t bytes);
+void pure_transfer_abort(PureTransfer *);
+#endif