mirror of https://github.com/postgres/postgres
After the preceding commits the auxprocess code is independent from bootstrap.c - so a dedicated file seems less confusing. Author: Andres Freund <andres@anarazel.de> Reviewed-By: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Reviewed-By: Robert Haas <robertmhaas@gmail.com> Discussion: https://postgr.es/m/20210802164124.ufo5buo4apl6yuvs@alap3.anarazel.depull/68/head
Andres Freund
4 years ago
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27f7903466
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/*-------------------------------------------------------------------------
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* auxprocess.c |
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* functions related to auxiliary processes. |
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* |
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* |
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* IDENTIFICATION |
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* src/backend/postmaster/auxprocess.c |
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*------------------------------------------------------------------------- |
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*/ |
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#include "postgres.h" |
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#include <unistd.h> |
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#include <signal.h> |
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#include "libpq/pqsignal.h" |
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#include "miscadmin.h" |
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#include "pgstat.h" |
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#include "postmaster/auxprocess.h" |
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#include "postmaster/bgwriter.h" |
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#include "postmaster/startup.h" |
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#include "postmaster/walwriter.h" |
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#include "replication/walreceiver.h" |
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#include "storage/bufmgr.h" |
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#include "storage/bufpage.h" |
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#include "storage/condition_variable.h" |
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#include "storage/ipc.h" |
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#include "storage/proc.h" |
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#include "tcop/tcopprot.h" |
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#include "utils/memutils.h" |
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#include "utils/ps_status.h" |
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#include "utils/rel.h" |
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static void ShutdownAuxiliaryProcess(int code, Datum arg); |
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/* ----------------
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* global variables |
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* ---------------- |
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*/ |
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AuxProcType MyAuxProcType = NotAnAuxProcess; /* declared in miscadmin.h */ |
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/*
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* AuxiliaryProcessMain |
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* |
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* The main entry point for auxiliary processes, such as the bgwriter, |
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* walwriter, walreceiver, bootstrapper and the shared memory checker code. |
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* |
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* This code is here just because of historical reasons. |
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*/ |
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void |
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AuxiliaryProcessMain(AuxProcType auxtype) |
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{ |
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Assert(IsUnderPostmaster); |
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MyAuxProcType = auxtype; |
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switch (MyAuxProcType) |
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{ |
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case StartupProcess: |
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MyBackendType = B_STARTUP; |
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break; |
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case ArchiverProcess: |
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MyBackendType = B_ARCHIVER; |
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break; |
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case BgWriterProcess: |
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MyBackendType = B_BG_WRITER; |
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break; |
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case CheckpointerProcess: |
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MyBackendType = B_CHECKPOINTER; |
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break; |
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case WalWriterProcess: |
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MyBackendType = B_WAL_WRITER; |
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break; |
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case WalReceiverProcess: |
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MyBackendType = B_WAL_RECEIVER; |
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break; |
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default: |
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elog(ERROR, "something has gone wrong"); |
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MyBackendType = B_INVALID; |
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} |
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init_ps_display(NULL); |
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SetProcessingMode(BootstrapProcessing); |
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IgnoreSystemIndexes = true; |
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BaseInit(); |
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/*
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* As an auxiliary process, we aren't going to do the full InitPostgres |
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* pushups, but there are a couple of things that need to get lit up even |
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* in an auxiliary process. |
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*/ |
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/*
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* Create a PGPROC so we can use LWLocks. In the EXEC_BACKEND case, this |
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* was already done by SubPostmasterMain(). |
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*/ |
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#ifndef EXEC_BACKEND |
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InitAuxiliaryProcess(); |
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#endif |
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/*
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* Assign the ProcSignalSlot for an auxiliary process. Since it doesn't |
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* have a BackendId, the slot is statically allocated based on the |
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* auxiliary process type (MyAuxProcType). Backends use slots indexed in |
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* the range from 1 to MaxBackends (inclusive), so we use MaxBackends + |
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* AuxProcType + 1 as the index of the slot for an auxiliary process. |
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* |
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* This will need rethinking if we ever want more than one of a particular |
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* auxiliary process type. |
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*/ |
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ProcSignalInit(MaxBackends + MyAuxProcType + 1); |
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/* finish setting up bufmgr.c */ |
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InitBufferPoolBackend(); |
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/*
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* Auxiliary processes don't run transactions, but they may need a |
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* resource owner anyway to manage buffer pins acquired outside |
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* transactions (and, perhaps, other things in future). |
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*/ |
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CreateAuxProcessResourceOwner(); |
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/* Initialize statistics reporting */ |
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pgstat_initialize(); |
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/* Initialize backend status information */ |
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pgstat_beinit(); |
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pgstat_bestart(); |
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/* register a before-shutdown callback for LWLock cleanup */ |
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before_shmem_exit(ShutdownAuxiliaryProcess, 0); |
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SetProcessingMode(NormalProcessing); |
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switch (MyAuxProcType) |
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{ |
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case CheckerProcess: |
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case BootstrapProcess: |
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pg_unreachable(); |
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break; |
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case StartupProcess: |
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StartupProcessMain(); |
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proc_exit(1); |
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case ArchiverProcess: |
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PgArchiverMain(); |
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proc_exit(1); |
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case BgWriterProcess: |
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BackgroundWriterMain(); |
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proc_exit(1); |
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case CheckpointerProcess: |
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CheckpointerMain(); |
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proc_exit(1); |
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case WalWriterProcess: |
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InitXLOGAccess(); |
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WalWriterMain(); |
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proc_exit(1); |
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case WalReceiverProcess: |
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WalReceiverMain(); |
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proc_exit(1); |
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default: |
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elog(PANIC, "unrecognized process type: %d", (int) MyAuxProcType); |
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proc_exit(1); |
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} |
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} |
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/*
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* Begin shutdown of an auxiliary process. This is approximately the equivalent |
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* of ShutdownPostgres() in postinit.c. We can't run transactions in an |
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* auxiliary process, so most of the work of AbortTransaction() is not needed, |
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* but we do need to make sure we've released any LWLocks we are holding. |
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* (This is only critical during an error exit.) |
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*/ |
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static void |
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ShutdownAuxiliaryProcess(int code, Datum arg) |
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{ |
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LWLockReleaseAll(); |
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ConditionVariableCancelSleep(); |
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pgstat_report_wait_end(); |
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} |
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@ -0,0 +1,20 @@ |
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/*-------------------------------------------------------------------------
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* auxprocess.h |
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* include file for functions related to auxiliary processes. |
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* |
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* |
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* IDENTIFICATION |
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* src/include/postmaster/auxprocess.h |
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*------------------------------------------------------------------------- |
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*/ |
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#ifndef AUXPROCESS_H |
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#define AUXPROCESS_H |
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#include "miscadmin.h" |
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extern void AuxiliaryProcessMain(AuxProcType auxtype) pg_attribute_noreturn(); |
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#endif /* AUXPROCESS_H */ |
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