/usr/include/postgres-xc/server/access/subtrans.h is in postgres-xc-server-dev 1.1-2ubuntu2.
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The actual contents of the file can be viewed below.
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* subtrans.h
*
* PostgreSQL subtransaction-log manager
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/subtrans.h
*/
#ifndef SUBTRANS_H
#define SUBTRANS_H
/* Number of SLRU buffers to use for subtrans */
#define NUM_SUBTRANS_BUFFERS 32
extern void SubTransSetParent(TransactionId xid, TransactionId parent, bool overwriteOK);
extern TransactionId SubTransGetParent(TransactionId xid);
extern TransactionId SubTransGetTopmostTransaction(TransactionId xid);
extern Size SUBTRANSShmemSize(void);
extern void SUBTRANSShmemInit(void);
extern void BootStrapSUBTRANS(void);
extern void StartupSUBTRANS(TransactionId oldestActiveXID);
extern void ShutdownSUBTRANS(void);
extern void CheckPointSUBTRANS(void);
extern void ExtendSUBTRANS(TransactionId newestXact);
extern void TruncateSUBTRANS(TransactionId oldestXact);
#endif /* SUBTRANS_H */
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