1 files changed, 43 insertions, 0 deletions
diff --git a/src/include/storage/procnumber.h b/src/include/storage/procnumber.h
new file mode 100644
index 00000000000..49eb0e215cc
--- /dev/null
+++ b/src/include/storage/procnumber.h
@@ -0,0 +1,43 @@
+/*-------------------------------------------------------------------------
+ *
+ * procnumber.h
+ *	  definition of process number
+ *
+ *
+ * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/storage/procnumber.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PROCNUMBER_H
+#define PROCNUMBER_H
+
+/*
+ * ProcNumber uniquely identifies an active backend or auxiliary process.
+ * It's assigned at backend startup after authentication, when the process
+ * adds itself to the proc array.  It is an index into the proc array,
+ * starting from 0. Note that a ProcNumber can be reused for a different
+ * backend immediately after a backend exits.
+ */
+typedef int ProcNumber;
+
+#define INVALID_PROC_NUMBER		(-1)
+
+/*
+ * Proc number of this backend (same as GetNumberFromPGProc(MyProc))
+ */
+extern PGDLLIMPORT ProcNumber MyProcNumber;
+
+/* proc number of our parallel session leader, or INVALID_PROC_NUMBER if none */
+extern PGDLLIMPORT ProcNumber ParallelLeaderProcNumber;
+
+/*
+ * The ProcNumber to use for our session's temp relations is normally our own,
+ * but parallel workers should use their leader's proc number.
+ */
+#define ProcNumberForTempRelations() \
+	(ParallelLeaderProcNumber == INVALID_PROC_NUMBER ? MyProcNumber : ParallelLeaderProcNumber)
+
+#endif							/* PROCNUMBER_H */