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pg_include/utils/logtape.h

@@ -0,0 +1,44 @@
+/*-------------------------------------------------------------------------
+ *
+ * logtape.h
+ *	  Management of "logical tapes" within temporary files.
+ *
+ * See logtape.c for explanations.
+ *
+ * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/utils/logtape.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef LOGTAPE_H
+#define LOGTAPE_H
+
+/* LogicalTapeSet is an opaque type whose details are not known outside logtape.c. */
+
+typedef struct LogicalTapeSet LogicalTapeSet;
+
+/*
+ * prototypes for functions in logtape.c
+ */
+
+extern LogicalTapeSet *LogicalTapeSetCreate(int ntapes);
+extern void LogicalTapeSetClose(LogicalTapeSet *lts);
+extern void LogicalTapeSetForgetFreeSpace(LogicalTapeSet *lts);
+extern size_t LogicalTapeRead(LogicalTapeSet *lts, int tapenum,
+				void *ptr, size_t size);
+extern void LogicalTapeWrite(LogicalTapeSet *lts, int tapenum,
+				 void *ptr, size_t size);
+extern void LogicalTapeRewind(LogicalTapeSet *lts, int tapenum, bool forWrite);
+extern void LogicalTapeFreeze(LogicalTapeSet *lts, int tapenum);
+extern bool LogicalTapeBackspace(LogicalTapeSet *lts, int tapenum,
+					 size_t size);
+extern bool LogicalTapeSeek(LogicalTapeSet *lts, int tapenum,
+				long blocknum, int offset);
+extern void LogicalTapeTell(LogicalTapeSet *lts, int tapenum,
+				long *blocknum, int *offset);
+extern long LogicalTapeSetBlocks(LogicalTapeSet *lts);
+
+#endif   /* LOGTAPE_H */