mirror of https://github.com/citusdata/citus.git
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/*
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* backend_data.h
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*
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* Data structure definition for managing backend data and related function
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* declarations.
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*
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* Copyright (c) 2017, Citus Data, Inc.
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef BACKEND_DATA_H
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#define BACKEND_DATA_H
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#include "access/twophase.h"
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#include "datatype/timestamp.h"
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#include "distributed/transaction_identifier.h"
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#include "nodes/pg_list.h"
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#include "storage/lwlock.h"
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#include "storage/proc.h"
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#include "storage/s_lock.h"
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#define TotalProcs (MaxBackends + NUM_AUXILIARY_PROCS + max_prepared_xacts)
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/*
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* Each backend's active distributed transaction information is tracked via
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* BackendData in shared memory.
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*/
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typedef struct BackendData
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{
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Oid databaseId;
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slock_t mutex;
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bool cancelledDueToDeadlock;
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DistributedTransactionId transactionId;
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} BackendData;
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extern void InitializeBackendManagement(void);
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extern void InitializeBackendData(void);
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extern void LockBackendSharedMemory(LWLockMode lockMode);
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extern void UnlockBackendSharedMemory(void);
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extern void UnSetDistributedTransactionId(void);
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extern void AssignDistributedTransactionId(void);
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extern void GetBackendDataForProc(PGPROC *proc, BackendData *result);
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extern void CancelTransactionDueToDeadlock(PGPROC *proc);
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extern bool MyBackendGotCancelledDueToDeadlock(void);
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extern List * ActiveDistributedTransactionNumbers(void);
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#endif /* BACKEND_DATA_H */
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