pgarch.h File Reference

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Macros
#define	MIN_XFN_CHARS   16
#define	MAX_XFN_CHARS   40
#define	VALID_XFN_CHARS   "0123456789ABCDEF.history.backup.partial"

Functions
Size	PgArchShmemSize (void)
void	PgArchShmemInit (void)
bool	PgArchCanRestart (void)
pg_noreturn void	PgArchiverMain (const void *startup_data, size_t startup_data_len)
void	PgArchWakeup (void)
void	PgArchForceDirScan (void)

Macro Definition Documentation

MAX_XFN_CHARS

#define MAX_XFN_CHARS   40

Definition at line 26 of file pgarch.h.

MIN_XFN_CHARS

#define MIN_XFN_CHARS   16

Definition at line 25 of file pgarch.h.

VALID_XFN_CHARS

#define VALID_XFN_CHARS   "0123456789ABCDEF.history.backup.partial"

Definition at line 27 of file pgarch.h.

Function Documentation

PgArchCanRestart()

bool PgArchCanRestart ( void  )

extern

Definition at line 197 of file pgarch.c.

{
    static time_t last_pgarch_start_time = 0;
    time_t      curtime = time(NULL);
 
    /*
     * If first time through, or time somehow went backwards, always update
     * last_pgarch_start_time to match the current clock and allow archiver
     * start.  Otherwise allow it only once enough time has elapsed.
     */
    if (last_pgarch_start_time == 0 ||
        curtime < last_pgarch_start_time ||
        curtime - last_pgarch_start_time >= PGARCH_RESTART_INTERVAL)
    {
        last_pgarch_start_time = curtime;
        return true;
    }

References fb(), and PGARCH_RESTART_INTERVAL.

Referenced by LaunchMissingBackgroundProcesses().

PgArchForceDirScan()

void PgArchForceDirScan ( void  )

extern

Definition at line 806 of file pgarch.c.

{

References PgArchData::force_dir_scan, pg_atomic_write_membarrier_u32(), and PgArch.

Referenced by XLogArchiveNotify().

PgArchiverMain()

pg_noreturn void PgArchiverMain ( const void *  startup_data, size_t  startup_data_len  )

extern

Definition at line 220 of file pgarch.c.

{
    Assert(startup_data_len == 0);
 
    AuxiliaryProcessMainCommon();
 
    /*
     * Ignore all signals usually bound to some action in the postmaster,
     * except for SIGHUP, SIGTERM, SIGUSR1, SIGUSR2, and SIGQUIT.
     */
    pqsignal(SIGHUP, SignalHandlerForConfigReload);
    pqsignal(SIGINT, SIG_IGN);
    pqsignal(SIGTERM, SignalHandlerForShutdownRequest);
    /* SIGQUIT handler was already set up by InitPostmasterChild */
    pqsignal(SIGALRM, SIG_IGN);
    pqsignal(SIGPIPE, SIG_IGN);
    pqsignal(SIGUSR1, procsignal_sigusr1_handler);
    pqsignal(SIGUSR2, pgarch_waken_stop);
 
    /* Reset some signals that are accepted by postmaster but not here */
    pqsignal(SIGCHLD, SIG_DFL);
 
    /* Unblock signals (they were blocked when the postmaster forked us) */
    sigprocmask(SIG_SETMASK, &UnBlockSig, NULL);
 
    /* We shouldn't be launched unnecessarily. */
    Assert(XLogArchivingActive());
 
    /* Arrange to clean up at archiver exit */
    on_shmem_exit(pgarch_die, 0);
 
    /*
     * Advertise our proc number so that backends can use our latch to wake us
     * up while we're sleeping.
     */
    PgArch->pgprocno = MyProcNumber;
 
    /* Create workspace for pgarch_readyXlog() */
    arch_files = palloc_object(struct arch_files_state);
    arch_files->arch_files_size = 0;
 
    /* Initialize our max-heap for prioritizing files to archive. */
    arch_files->arch_heap = binaryheap_allocate(NUM_FILES_PER_DIRECTORY_SCAN,
                                                ready_file_comparator, NULL);
 
    /* Initialize our memory context. */
    archive_context = AllocSetContextCreate(TopMemoryContext,
                                            "archiver",
                                            ALLOCSET_DEFAULT_SIZES);
 
    /* Load the archive_library. */
    LoadArchiveLibrary();
 
    pgarch_MainLoop();
 

References ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, arch_files, arch_files_state::arch_files_size, arch_files_state::arch_heap, archive_context, Assert, AuxiliaryProcessMainCommon(), binaryheap_allocate(), fb(), LoadArchiveLibrary(), MyProcNumber, NUM_FILES_PER_DIRECTORY_SCAN, on_shmem_exit(), palloc_object, PgArch, pgarch_die(), pgarch_MainLoop(), pgarch_waken_stop(), PgArchData::pgprocno, pqsignal, proc_exit(), procsignal_sigusr1_handler(), ready_file_comparator(), SIGALRM, SIGCHLD, SIGHUP, SignalHandlerForConfigReload(), SignalHandlerForShutdownRequest(), SIGPIPE, SIGUSR1, SIGUSR2, TopMemoryContext, UnBlockSig, and XLogArchivingActive.

PgArchShmemInit()

void PgArchShmemInit ( void  )

extern

Definition at line 168 of file pgarch.c.

{
    bool        found;
 
    PgArch = (PgArchData *)
        ShmemInitStruct("Archiver Data", PgArchShmemSize(), &found);
 
    if (!found)
    {
        /* First time through, so initialize */
        MemSet(PgArch, 0, PgArchShmemSize());
        PgArch->pgprocno = INVALID_PROC_NUMBER;
        pg_atomic_init_u32(&PgArch->force_dir_scan, 0);

References PgArchData::force_dir_scan, INVALID_PROC_NUMBER, MemSet, pg_atomic_init_u32(), PgArch, PgArchShmemSize(), PgArchData::pgprocno, and ShmemInitStruct().

Referenced by CreateOrAttachShmemStructs().

PgArchShmemSize()

Size PgArchShmemSize ( void  )

extern

Definition at line 157 of file pgarch.c.

{
    Size        size = 0;
 
    size = add_size(size, sizeof(PgArchData));
 

References add_size().

Referenced by CalculateShmemSize(), and PgArchShmemInit().

PgArchWakeup()

void PgArchWakeup ( void  )

extern

Definition at line 282 of file pgarch.c.

{
    int         arch_pgprocno = PgArch->pgprocno;
 
    /*
     * We don't acquire ProcArrayLock here.  It's actually fine because
     * procLatch isn't ever freed, so we just can potentially set the wrong
     * process' (or no process') latch.  Even in that case the archiver will
     * be relaunched shortly and will start archiving.
     */
    if (arch_pgprocno != INVALID_PROC_NUMBER)

References fb(), GetPGProcByNumber, INVALID_PROC_NUMBER, PgArch, PgArchData::pgprocno, and SetLatch().

Referenced by XLogArchiveNotify().