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/*------------------------------------------------------------------------- * * 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 */