Adding upstream version 15.4.upstream/15.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/include/storage/sharedfileset.h b/src/include/storage/sharedfileset.h
new file mode 100644
index 0000000..b1cde36
--- /dev/null
+++ b/src/include/storage/sharedfileset.h
@@ -0,0 +1,37 @@
+/*-------------------------------------------------------------------------
+ *
+ * sharedfileset.h
+ *	  Shared temporary file management.
+ *
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/storage/sharedfileset.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef SHAREDFILESET_H
+#define SHAREDFILESET_H
+
+#include "storage/dsm.h"
+#include "storage/fd.h"
+#include "storage/fileset.h"
+#include "storage/spin.h"
+
+/*
+ * A set of temporary files that can be shared by multiple backends.
+ */
+typedef struct SharedFileSet
+{
+	FileSet		fs;
+	slock_t		mutex;			/* mutex protecting the reference count */
+	int			refcnt;			/* number of attached backends */
+} SharedFileSet;
+
+extern void SharedFileSetInit(SharedFileSet *fileset, dsm_segment *seg);
+extern void SharedFileSetAttach(SharedFileSet *fileset, dsm_segment *seg);
+extern void SharedFileSetDeleteAll(SharedFileSet *fileset);
+
+#endif