3 files changed, 29 insertions, 1 deletions
diff --git a/src/include/storage/aio_subsys.h b/src/include/storage/aio_subsys.h
index 2a6ca1c27a9..8a8ce87f62a 100644
--- a/src/include/storage/aio_subsys.h
+++ b/src/include/storage/aio_subsys.h
@@ -30,4 +30,8 @@ extern void pgaio_init_backend(void);
 extern void pgaio_error_cleanup(void);
 extern void AtEOXact_Aio(bool is_commit);
 
+
+/* aio_worker.c */
+extern bool pgaio_workers_enabled(void);
+
 #endif							/* AIO_SUBSYS_H */
diff --git a/src/include/storage/io_worker.h b/src/include/storage/io_worker.h
new file mode 100644
index 00000000000..7bde7e89c8a
--- /dev/null
+++ b/src/include/storage/io_worker.h
@@ -0,0 +1,22 @@
+/*-------------------------------------------------------------------------
+ *
+ * io_worker.h
+ *    IO worker for implementing AIO "ourselves"
+ *
+ *
+ * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/storage/io.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef IO_WORKER_H
+#define IO_WORKER_H
+
+
+pg_noreturn extern void IoWorkerMain(const void *startup_data, size_t startup_data_len);
+
+extern PGDLLIMPORT int io_workers;
+
+#endif							/* IO_WORKER_H */
diff --git a/src/include/storage/proc.h b/src/include/storage/proc.h
index 0750ec3c474..f51b03d3822 100644
--- a/src/include/storage/proc.h
+++ b/src/include/storage/proc.h
@@ -449,7 +449,9 @@ extern PGDLLIMPORT PGPROC *PreparedXactProcs;
  * 2 slots, but WAL writer is launched only after startup has exited, so we
  * only need 6 slots.
  */
-#define NUM_AUXILIARY_PROCS		6
+#define MAX_IO_WORKERS          32
+#define NUM_AUXILIARY_PROCS		(6 + MAX_IO_WORKERS)
+
 
 /* configurable options */
 extern PGDLLIMPORT int DeadlockTimeout;