auxprocess.h File Reference

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Functions
void	AuxiliaryProcessMainCommon (void)

Function Documentation

AuxiliaryProcessMainCommon()

void AuxiliaryProcessMainCommon ( void  )

extern

Definition at line 41 of file auxprocess.c.

{
    Assert(IsUnderPostmaster);
 
    /* Release postmaster's working memory context */
    if (PostmasterContext)
    {
        MemoryContextDelete(PostmasterContext);
        PostmasterContext = NULL;
    }
 
    init_ps_display(NULL);
 
    Assert(GetProcessingMode() == InitProcessing);
 
    IgnoreSystemIndexes = true;
 
    /*
     * As an auxiliary process, we aren't going to do the full InitPostgres
     * pushups, but there are a couple of things that need to get lit up even
     * in an auxiliary process.
     */
 
    /*
     * Create a PGPROC so we can use LWLocks and access shared memory.
     */
    InitAuxiliaryProcess();
 
    BaseInit();
 
    /*
     * Prevent consuming interrupts between setting ProcSignalInit and setting
     * the initial local data checksum value.  If a barrier is emitted, and
     * absorbed, before local cached state is initialized the state transition
     * can be invalid.
     */
    HOLD_INTERRUPTS();
 
    ProcSignalInit(NULL, 0);
 
    /*
     * Initialize a local cache of the data_checksum_version, to be updated by
     * the procsignal-based barriers.
     *
     * This intentionally happens after initializing the procsignal, otherwise
     * we might miss a state change. This means we can get a barrier for the
     * state we've just initialized - but it can happen only once.
     *
     * The postmaster (which is what gets forked into the new child process)
     * does not handle barriers, therefore it may not have the current value
     * of LocalDataChecksumVersion value (it'll have the value read from the
     * control file, which may be arbitrarily old).
     *
     * NB: Even if the postmaster handled barriers, the value might still be
     * stale, as it might have changed after this process forked.
     */
    InitLocalDataChecksumState();
 
    RESUME_INTERRUPTS();
 
    /*
     * Auxiliary processes don't run transactions, but they may need a
     * resource owner anyway to manage buffer pins acquired outside
     * transactions (and, perhaps, other things in future).
     */
    CreateAuxProcessResourceOwner();
 
 
    /* Initialize backend status information */
    pgstat_beinit();
    pgstat_bestart_initial();
    pgstat_bestart_final();
 
    /* register a before-shutdown callback for LWLock cleanup */
    before_shmem_exit(ShutdownAuxiliaryProcess, 0);
 
    SetProcessingMode(NormalProcessing);
}

References Assert, BaseInit(), before_shmem_exit(), CreateAuxProcessResourceOwner(), fb(), GetProcessingMode, HOLD_INTERRUPTS, IgnoreSystemIndexes, init_ps_display(), InitAuxiliaryProcess(), InitLocalDataChecksumState(), InitProcessing, IsUnderPostmaster, MemoryContextDelete(), NormalProcessing, pgstat_beinit(), pgstat_bestart_final(), pgstat_bestart_initial(), PostmasterContext, ProcSignalInit(), RESUME_INTERRUPTS, SetProcessingMode, and ShutdownAuxiliaryProcess().

Referenced by BackgroundWriterMain(), CheckpointerMain(), IoWorkerMain(), PgArchiverMain(), StartupProcessMain(), WalReceiverMain(), WalSummarizerMain(), and WalWriterMain().