slot.h File Reference

#include "access/xlog.h"
#include "access/xlogreader.h"
#include "storage/condition_variable.h"
#include "storage/lwlock.h"
#include "storage/shmem.h"
#include "storage/spin.h"
#include "replication/walreceiver.h"

Include dependency graph for slot.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures
struct	ReplicationSlotPersistentData
struct	ReplicationSlot
struct	ReplicationSlotCtlData

Macros
#define	SlotIsPhysical(slot)   ((slot)->data.database == InvalidOid)
#define	SlotIsLogical(slot)   ((slot)->data.database != InvalidOid)

Typedefs
typedef enum ReplicationSlotPersistency	ReplicationSlotPersistency
typedef struct ReplicationSlotPersistentData	ReplicationSlotPersistentData
typedef struct ReplicationSlot	ReplicationSlot
typedef struct ReplicationSlotCtlData	ReplicationSlotCtlData

Enumerations
enum	ReplicationSlotPersistency { RS_PERSISTENT, RS_EPHEMERAL, RS_TEMPORARY }

Functions
Size	ReplicationSlotsShmemSize (void)
void	ReplicationSlotsShmemInit (void)
void	ReplicationSlotCreate (const char *name, bool db_specific, ReplicationSlotPersistency p, bool two_phase)
void	ReplicationSlotPersist (void)
void	ReplicationSlotDrop (const char *name, bool nowait)
void	ReplicationSlotAcquire (const char *name, bool nowait)
void	ReplicationSlotRelease (void)
void	ReplicationSlotCleanup (void)
void	ReplicationSlotSave (void)
void	ReplicationSlotMarkDirty (void)
bool	ReplicationSlotValidateName (const char *name, int elevel)
void	ReplicationSlotReserveWal (void)
void	ReplicationSlotsComputeRequiredXmin (bool already_locked)
void	ReplicationSlotsComputeRequiredLSN (void)
XLogRecPtr	ReplicationSlotsComputeLogicalRestartLSN (void)
bool	ReplicationSlotsCountDBSlots (Oid dboid, int *nslots, int *nactive)
void	ReplicationSlotsDropDBSlots (Oid dboid)
bool	InvalidateObsoleteReplicationSlots (XLogSegNo oldestSegno)
ReplicationSlot *	SearchNamedReplicationSlot (const char *name, bool need_lock)
void	ReplicationSlotNameForTablesync (Oid suboid, Oid relid, char *syncslotname, int szslot)
void	ReplicationSlotDropAtPubNode (WalReceiverConn *wrconn, char *slotname, bool missing_ok)
void	StartupReplicationSlots (void)
void	CheckPointReplicationSlots (void)
void	CheckSlotRequirements (void)
void	CheckSlotPermissions (void)

Variables
PGDLLIMPORT ReplicationSlotCtlData *	ReplicationSlotCtl
PGDLLIMPORT ReplicationSlot *	MyReplicationSlot
PGDLLIMPORT int	max_replication_slots

Macro Definition Documentation

SlotIsLogical

#define SlotIsLogical

(

slot

)

((slot)->data.database != InvalidOid)

Definition at line 169 of file slot.h.

Referenced by copy_replication_slot(), ProcessStandbyReplyMessage(), ReplicationSlotCreate(), ReplicationSlotDropPtr(), ReplicationSlotReserveWal(), ReplicationSlotsComputeLogicalRestartLSN(), ReplicationSlotsCountDBSlots(), ReplicationSlotsDropDBSlots(), and StartReplication().

SlotIsPhysical

#define SlotIsPhysical

(

slot

)

((slot)->data.database == InvalidOid)

Definition at line 168 of file slot.h.

Referenced by CreateDecodingContext(), CreateInitDecodingContext(), and pg_stat_reset_replication_slot().

Typedef Documentation

ReplicationSlot

typedef struct ReplicationSlot ReplicationSlot

ReplicationSlotCtlData

typedef struct ReplicationSlotCtlData ReplicationSlotCtlData

ReplicationSlotPersistency

typedef enum ReplicationSlotPersistency ReplicationSlotPersistency

ReplicationSlotPersistentData

typedef struct ReplicationSlotPersistentData ReplicationSlotPersistentData

Enumeration Type Documentation

ReplicationSlotPersistency

enum ReplicationSlotPersistency

Enumerator
RS_PERSISTENT
RS_EPHEMERAL
RS_TEMPORARY

Definition at line 33 of file slot.h.

{
    RS_PERSISTENT,
    RS_EPHEMERAL,
    RS_TEMPORARY
} ReplicationSlotPersistency;

Function Documentation

CheckPointReplicationSlots()

void CheckPointReplicationSlots

(

void

)

Definition at line 1360 of file slot.c.

References ReplicationSlot::data, DEBUG1, elog, i, ReplicationSlot::in_use, LOG, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, MAXPGPATH, ReplicationSlotPersistentData::name, NameStr, ReplicationSlotCtlData::replication_slots, SaveSlotToPath(), and sprintf.

Referenced by CheckPointGuts().

{
    int         i;

    elog(DEBUG1, "performing replication slot checkpoint");

    /*
     * Prevent any slot from being created/dropped while we're active. As we
     * explicitly do *not* want to block iterating over replication_slots or
     * acquiring a slot we cannot take the control lock - but that's OK,
     * because holding ReplicationSlotAllocationLock is strictly stronger, and
     * enough to guarantee that nobody can change the in_use bits on us.
     */
    LWLockAcquire(ReplicationSlotAllocationLock, LW_SHARED);

    for (i = 0; i < max_replication_slots; i++)
    {
        ReplicationSlot *s = &ReplicationSlotCtl->replication_slots[i];
        char        path[MAXPGPATH];

        if (!s->in_use)
            continue;

        /* save the slot to disk, locking is handled in SaveSlotToPath() */
        sprintf(path, "pg_replslot/%s", NameStr(s->data.name));
        SaveSlotToPath(s, path, LOG);
    }
    LWLockRelease(ReplicationSlotAllocationLock);
}

CheckSlotPermissions()

void CheckSlotPermissions

(

void

)

Definition at line 1066 of file slot.c.

References ereport, errcode(), errmsg(), ERROR, GetUserId(), has_rolreplication(), and superuser().

Referenced by copy_replication_slot(), pg_create_logical_replication_slot(), pg_create_physical_replication_slot(), pg_drop_replication_slot(), pg_logical_slot_get_changes_guts(), and pg_replication_slot_advance().

{
    if (!superuser() && !has_rolreplication(GetUserId()))
        ereport(ERROR,
                (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
                 errmsg("must be superuser or replication role to use replication slots")));
}

CheckSlotRequirements()

void CheckSlotRequirements

(

void

)

Definition at line 1044 of file slot.c.

References ereport, errcode(), errmsg(), ERROR, max_replication_slots, wal_level, and WAL_LEVEL_REPLICA.

Referenced by CheckLogicalDecodingRequirements(), copy_replication_slot(), pg_create_physical_replication_slot(), and pg_drop_replication_slot().

{
    /*
     * NB: Adding a new requirement likely means that RestoreSlotFromDisk()
     * needs the same check.
     */

    if (max_replication_slots == 0)
        ereport(ERROR,
                (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                 errmsg("replication slots can only be used if max_replication_slots > 0")));

    if (wal_level < WAL_LEVEL_REPLICA)
        ereport(ERROR,
                (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                 errmsg("replication slots can only be used if wal_level >= replica")));
}

InvalidateObsoleteReplicationSlots()

bool InvalidateObsoleteReplicationSlots

(

XLogSegNo

oldestSegno

)

Definition at line 1317 of file slot.c.

References i, ReplicationSlot::in_use, InvalidatePossiblyObsoleteSlot(), LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, ReplicationSlotCtlData::replication_slots, ReplicationSlotsComputeRequiredLSN(), ReplicationSlotsComputeRequiredXmin(), wal_segment_size, and XLogSegNoOffsetToRecPtr.

Referenced by CreateCheckPoint(), and CreateRestartPoint().

{
    XLogRecPtr  oldestLSN;
    bool        invalidated = false;

    XLogSegNoOffsetToRecPtr(oldestSegno, 0, wal_segment_size, oldestLSN);

restart:
    LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);
    for (int i = 0; i < max_replication_slots; i++)
    {
        ReplicationSlot *s = &ReplicationSlotCtl->replication_slots[i];

        if (!s->in_use)
            continue;

        if (InvalidatePossiblyObsoleteSlot(s, oldestLSN, &invalidated))
        {
            /* if the lock was released, start from scratch */
            goto restart;
        }
    }
    LWLockRelease(ReplicationSlotControlLock);

    /*
     * If any slots have been invalidated, recalculate the resource limits.
     */
    if (invalidated)
    {
        ReplicationSlotsComputeRequiredXmin(false);
        ReplicationSlotsComputeRequiredLSN();
    }

    return invalidated;
}

ReplicationSlotAcquire()

void ReplicationSlotAcquire	(	const char *	name,
		bool	nowait
	)

Definition at line 380 of file slot.c.

References ReplicationSlot::active_cv, ReplicationSlot::active_pid, Assert, AssertArg, ConditionVariableBroadcast(), ConditionVariableCancelSleep(), ConditionVariablePrepareToSleep(), ConditionVariableSleep(), ReplicationSlot::data, ereport, errcode(), errmsg(), ERROR, ReplicationSlot::in_use, IsUnderPostmaster, LW_SHARED, LWLockAcquire(), LWLockRelease(), ReplicationSlot::mutex, MyProcPid, ReplicationSlotPersistentData::name, NameStr, SearchNamedReplicationSlot(), SpinLockAcquire, SpinLockRelease, and WAIT_EVENT_REPLICATION_SLOT_DROP.

Referenced by pg_logical_slot_get_changes_guts(), pg_replication_slot_advance(), ReplicationSlotDrop(), StartLogicalReplication(), and StartReplication().

{
    ReplicationSlot *s;
    int         active_pid;

    AssertArg(name != NULL);

retry:
    Assert(MyReplicationSlot == NULL);

    LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);

    /*
     * Search for the slot with the specified name if the slot to acquire is
     * not given. If the slot is not found, we either return -1 or error out.
     */
    s = SearchNamedReplicationSlot(name, false);
    if (s == NULL || !s->in_use)
    {
        LWLockRelease(ReplicationSlotControlLock);

        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_OBJECT),
                 errmsg("replication slot \"%s\" does not exist",
                        name)));
    }

    /*
     * This is the slot we want; check if it's active under some other
     * process.  In single user mode, we don't need this check.
     */
    if (IsUnderPostmaster)
    {
        /*
         * Get ready to sleep on the slot in case it is active.  (We may end
         * up not sleeping, but we don't want to do this while holding the
         * spinlock.)
         */
        if (!nowait)
            ConditionVariablePrepareToSleep(&s->active_cv);

        SpinLockAcquire(&s->mutex);
        if (s->active_pid == 0)
            s->active_pid = MyProcPid;
        active_pid = s->active_pid;
        SpinLockRelease(&s->mutex);
    }
    else
        active_pid = MyProcPid;
    LWLockRelease(ReplicationSlotControlLock);

    /*
     * If we found the slot but it's already active in another process, we
     * wait until the owning process signals us that it's been released, or
     * error out.
     */
    if (active_pid != MyProcPid)
    {
        if (!nowait)
        {
            /* Wait here until we get signaled, and then restart */
            ConditionVariableSleep(&s->active_cv,
                                   WAIT_EVENT_REPLICATION_SLOT_DROP);
            ConditionVariableCancelSleep();
            goto retry;
        }

        ereport(ERROR,
                (errcode(ERRCODE_OBJECT_IN_USE),
                 errmsg("replication slot \"%s\" is active for PID %d",
                        NameStr(s->data.name), active_pid)));
    }
    else if (!nowait)
        ConditionVariableCancelSleep(); /* no sleep needed after all */

    /* Let everybody know we've modified this slot */
    ConditionVariableBroadcast(&s->active_cv);

    /* We made this slot active, so it's ours now. */
    MyReplicationSlot = s;
}

ReplicationSlotCleanup()

void ReplicationSlotCleanup

(

void

)

Definition at line 525 of file slot.c.

References ReplicationSlot::active_cv, ReplicationSlot::active_pid, Assert, ConditionVariableBroadcast(), ReplicationSlot::data, i, ReplicationSlot::in_use, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, ReplicationSlot::mutex, MyProcPid, ReplicationSlotPersistentData::persistency, ReplicationSlotCtlData::replication_slots, ReplicationSlotDropPtr(), RS_TEMPORARY, SpinLockAcquire, and SpinLockRelease.

Referenced by PostgresMain(), ProcKill(), and WalSndErrorCleanup().

{
    int         i;

    Assert(MyReplicationSlot == NULL);

restart:
    LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);
    for (i = 0; i < max_replication_slots; i++)
    {
        ReplicationSlot *s = &ReplicationSlotCtl->replication_slots[i];

        if (!s->in_use)
            continue;

        SpinLockAcquire(&s->mutex);
        if (s->active_pid == MyProcPid)
        {
            Assert(s->data.persistency == RS_TEMPORARY);
            SpinLockRelease(&s->mutex);
            LWLockRelease(ReplicationSlotControlLock);  /* avoid deadlock */

            ReplicationSlotDropPtr(s);

            ConditionVariableBroadcast(&s->active_cv);
            goto restart;
        }
        else
            SpinLockRelease(&s->mutex);
    }

    LWLockRelease(ReplicationSlotControlLock);
}

ReplicationSlotCreate()

void ReplicationSlotCreate	(	const char *	name,
		bool	db_specific,
		ReplicationSlotPersistency	p,
		bool	two_phase
	)

Definition at line 226 of file slot.c.

References ReplicationSlot::active_cv, ReplicationSlot::active_pid, Assert, ReplicationSlot::candidate_catalog_xmin, ReplicationSlot::candidate_restart_lsn, ReplicationSlot::candidate_restart_valid, ReplicationSlot::candidate_xmin_lsn, ConditionVariableBroadcast(), CreateSlotOnDisk(), ReplicationSlot::data, ReplicationSlotPersistentData::database, ReplicationSlot::dirty, ReplicationSlot::effective_catalog_xmin, ReplicationSlot::effective_xmin, ereport, errcode(), ERRCODE_DUPLICATE_OBJECT, errhint(), errmsg(), ERROR, i, ReplicationSlot::in_use, InvalidOid, InvalidTransactionId, InvalidXLogRecPtr, ReplicationSlot::just_dirtied, LW_EXCLUSIVE, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, ReplicationSlot::mutex, MyDatabaseId, MyProcPid, ReplicationSlotPersistentData::name, NameStr, namestrcpy(), ReplicationSlotPersistentData::persistency, pgstat_report_replslot_create(), ReplicationSlotCtlData::replication_slots, ReplicationSlotValidateName(), SlotIsLogical, SpinLockAcquire, SpinLockRelease, two_phase, ReplicationSlotPersistentData::two_phase, and ReplicationSlotPersistentData::two_phase_at.

Referenced by create_logical_replication_slot(), create_physical_replication_slot(), and CreateReplicationSlot().

{
    ReplicationSlot *slot = NULL;
    int         i;

    Assert(MyReplicationSlot == NULL);

    ReplicationSlotValidateName(name, ERROR);

    /*
     * If some other backend ran this code concurrently with us, we'd likely
     * both allocate the same slot, and that would be bad.  We'd also be at
     * risk of missing a name collision.  Also, we don't want to try to create
     * a new slot while somebody's busy cleaning up an old one, because we
     * might both be monkeying with the same directory.
     */
    LWLockAcquire(ReplicationSlotAllocationLock, LW_EXCLUSIVE);

    /*
     * Check for name collision, and identify an allocatable slot.  We need to
     * hold ReplicationSlotControlLock in shared mode for this, so that nobody
     * else can change the in_use flags while we're looking at them.
     */
    LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);
    for (i = 0; i < max_replication_slots; i++)
    {
        ReplicationSlot *s = &ReplicationSlotCtl->replication_slots[i];

        if (s->in_use && strcmp(name, NameStr(s->data.name)) == 0)
            ereport(ERROR,
                    (errcode(ERRCODE_DUPLICATE_OBJECT),
                     errmsg("replication slot \"%s\" already exists", name)));
        if (!s->in_use && slot == NULL)
            slot = s;
    }
    LWLockRelease(ReplicationSlotControlLock);

    /* If all slots are in use, we're out of luck. */
    if (slot == NULL)
        ereport(ERROR,
                (errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
                 errmsg("all replication slots are in use"),
                 errhint("Free one or increase max_replication_slots.")));

    /*
     * Since this slot is not in use, nobody should be looking at any part of
     * it other than the in_use field unless they're trying to allocate it.
     * And since we hold ReplicationSlotAllocationLock, nobody except us can
     * be doing that.  So it's safe to initialize the slot.
     */
    Assert(!slot->in_use);
    Assert(slot->active_pid == 0);

    /* first initialize persistent data */
    memset(&slot->data, 0, sizeof(ReplicationSlotPersistentData));
    namestrcpy(&slot->data.name, name);
    slot->data.database = db_specific ? MyDatabaseId : InvalidOid;
    slot->data.persistency = persistency;
    slot->data.two_phase = two_phase;
    slot->data.two_phase_at = InvalidXLogRecPtr;

    /* and then data only present in shared memory */
    slot->just_dirtied = false;
    slot->dirty = false;
    slot->effective_xmin = InvalidTransactionId;
    slot->effective_catalog_xmin = InvalidTransactionId;
    slot->candidate_catalog_xmin = InvalidTransactionId;
    slot->candidate_xmin_lsn = InvalidXLogRecPtr;
    slot->candidate_restart_valid = InvalidXLogRecPtr;
    slot->candidate_restart_lsn = InvalidXLogRecPtr;

    /*
     * Create the slot on disk.  We haven't actually marked the slot allocated
     * yet, so no special cleanup is required if this errors out.
     */
    CreateSlotOnDisk(slot);

    /*
     * We need to briefly prevent any other backend from iterating over the
     * slots while we flip the in_use flag. We also need to set the active
     * flag while holding the ControlLock as otherwise a concurrent
     * ReplicationSlotAcquire() could acquire the slot as well.
     */
    LWLockAcquire(ReplicationSlotControlLock, LW_EXCLUSIVE);

    slot->in_use = true;

    /* We can now mark the slot active, and that makes it our slot. */
    SpinLockAcquire(&slot->mutex);
    Assert(slot->active_pid == 0);
    slot->active_pid = MyProcPid;
    SpinLockRelease(&slot->mutex);
    MyReplicationSlot = slot;

    LWLockRelease(ReplicationSlotControlLock);

    /*
     * Create statistics entry for the new logical slot. We don't collect any
     * stats for physical slots, so no need to create an entry for the same.
     * See ReplicationSlotDropPtr for why we need to do this before releasing
     * ReplicationSlotAllocationLock.
     */
    if (SlotIsLogical(slot))
        pgstat_report_replslot_create(NameStr(slot->data.name));

    /*
     * Now that the slot has been marked as in_use and active, it's safe to
     * let somebody else try to allocate a slot.
     */
    LWLockRelease(ReplicationSlotAllocationLock);

    /* Let everybody know we've modified this slot */
    ConditionVariableBroadcast(&slot->active_cv);
}

ReplicationSlotDrop()

void ReplicationSlotDrop	(	const char *	name,
		bool	nowait
	)

Definition at line 563 of file slot.c.

References Assert, ReplicationSlotAcquire(), and ReplicationSlotDropAcquired().

Referenced by DropReplicationSlot(), and pg_drop_replication_slot().

{
    Assert(MyReplicationSlot == NULL);

    ReplicationSlotAcquire(name, nowait);

    ReplicationSlotDropAcquired();
}

ReplicationSlotDropAtPubNode()

void ReplicationSlotDropAtPubNode	(	WalReceiverConn *	wrconn,
		char *	slotname,
		bool	missing_ok
	)

Definition at line 1391 of file subscriptioncmds.c.

References appendStringInfo(), Assert, StringInfoData::data, ereport, WalRcvExecResult::err, errcode(), errmsg(), ERROR, initStringInfo(), load_file(), LOG, NOTICE, pfree(), PG_END_TRY, PG_FINALLY, PG_TRY, quote_identifier(), WalRcvExecResult::sqlstate, WalRcvExecResult::status, walrcv_clear_result(), WALRCV_ERROR, walrcv_exec, and WALRCV_OK_COMMAND.

Referenced by AlterSubscription_refresh(), DropSubscription(), LogicalRepSyncTableStart(), and process_syncing_tables_for_sync().

{
    StringInfoData cmd;

    Assert(wrconn);

    load_file("libpqwalreceiver", false);

    initStringInfo(&cmd);
    appendStringInfo(&cmd, "DROP_REPLICATION_SLOT %s WAIT", quote_identifier(slotname));

    PG_TRY();
    {
        WalRcvExecResult *res;

        res = walrcv_exec(wrconn, cmd.data, 0, NULL);

        if (res->status == WALRCV_OK_COMMAND)
        {
            /* NOTICE. Success. */
            ereport(NOTICE,
                    (errmsg("dropped replication slot \"%s\" on publisher",
                            slotname)));
        }
        else if (res->status == WALRCV_ERROR &&
                 missing_ok &&
                 res->sqlstate == ERRCODE_UNDEFINED_OBJECT)
        {
            /* LOG. Error, but missing_ok = true. */
            ereport(LOG,
                    (errmsg("could not drop replication slot \"%s\" on publisher: %s",
                            slotname, res->err)));
        }
        else
        {
            /* ERROR. */
            ereport(ERROR,
                    (errcode(ERRCODE_CONNECTION_FAILURE),
                     errmsg("could not drop replication slot \"%s\" on publisher: %s",
                            slotname, res->err)));
        }

        walrcv_clear_result(res);
    }
    PG_FINALLY();
    {
        pfree(cmd.data);
    }
    PG_END_TRY();
}

ReplicationSlotMarkDirty()

void ReplicationSlotMarkDirty

(

void

)

Definition at line 728 of file slot.c.

References Assert, ReplicationSlot::dirty, ReplicationSlot::just_dirtied, ReplicationSlot::mutex, MyReplicationSlot, SpinLockAcquire, and SpinLockRelease.

Referenced by copy_replication_slot(), create_physical_replication_slot(), CreateDecodingContext(), CreateInitDecodingContext(), CreateReplicationSlot(), InvalidatePossiblyObsoleteSlot(), LogicalConfirmReceivedLocation(), pg_logical_replication_slot_advance(), pg_logical_slot_get_changes_guts(), pg_physical_replication_slot_advance(), PhysicalConfirmReceivedLocation(), PhysicalReplicationSlotNewXmin(), and ReplicationSlotPersist().

{
    ReplicationSlot *slot = MyReplicationSlot;

    Assert(MyReplicationSlot != NULL);

    SpinLockAcquire(&slot->mutex);
    MyReplicationSlot->just_dirtied = true;
    MyReplicationSlot->dirty = true;
    SpinLockRelease(&slot->mutex);
}

ReplicationSlotNameForTablesync()

void ReplicationSlotNameForTablesync	(	Oid	suboid,
		Oid	relid,
		char *	syncslotname,
		int	szslot
	)

Definition at line 892 of file tablesync.c.

References GetSystemIdentifier(), snprintf, and UINT64_FORMAT.

Referenced by AlterSubscription_refresh(), DropSubscription(), LogicalRepSyncTableStart(), process_syncing_tables_for_sync(), and ReportSlotConnectionError().

{
    snprintf(syncslotname, szslot, "pg_%u_sync_%u_" UINT64_FORMAT, suboid,
             relid, GetSystemIdentifier());
}

ReplicationSlotPersist()

void ReplicationSlotPersist

(

void

)

Definition at line 745 of file slot.c.

References Assert, ReplicationSlot::data, ReplicationSlot::mutex, MyReplicationSlot, ReplicationSlotPersistentData::persistency, ReplicationSlotMarkDirty(), ReplicationSlotSave(), RS_PERSISTENT, SpinLockAcquire, and SpinLockRelease.

Referenced by copy_replication_slot(), CreateReplicationSlot(), and pg_create_logical_replication_slot().

{
    ReplicationSlot *slot = MyReplicationSlot;

    Assert(slot != NULL);
    Assert(slot->data.persistency != RS_PERSISTENT);

    SpinLockAcquire(&slot->mutex);
    slot->data.persistency = RS_PERSISTENT;
    SpinLockRelease(&slot->mutex);

    ReplicationSlotMarkDirty();
    ReplicationSlotSave();
}

ReplicationSlotRelease()

void ReplicationSlotRelease

(

void

)

Definition at line 469 of file slot.c.

References ReplicationSlot::active_cv, ReplicationSlot::active_pid, Assert, ConditionVariableBroadcast(), ReplicationSlot::data, ReplicationSlot::effective_xmin, InvalidTransactionId, LW_SHARED, LWLockAcquire(), LWLockRelease(), ReplicationSlot::mutex, MyProc, MyReplicationSlot, ReplicationSlotPersistentData::persistency, PGPROC::pgxactoff, PROC_IN_LOGICAL_DECODING, ProcGlobal, ReplicationSlotDropAcquired(), ReplicationSlotsComputeRequiredXmin(), RS_EPHEMERAL, RS_PERSISTENT, SpinLockAcquire, SpinLockRelease, PGPROC::statusFlags, PROC_HDR::statusFlags, TransactionIdIsValid, and ReplicationSlotPersistentData::xmin.

Referenced by copy_replication_slot(), CreateReplicationSlot(), InvalidatePossiblyObsoleteSlot(), pg_create_logical_replication_slot(), pg_create_physical_replication_slot(), pg_logical_slot_get_changes_guts(), pg_replication_slot_advance(), PostgresMain(), ProcKill(), StartLogicalReplication(), StartReplication(), and WalSndErrorCleanup().

{
    ReplicationSlot *slot = MyReplicationSlot;

    Assert(slot != NULL && slot->active_pid != 0);

    if (slot->data.persistency == RS_EPHEMERAL)
    {
        /*
         * Delete the slot. There is no !PANIC case where this is allowed to
         * fail, all that may happen is an incomplete cleanup of the on-disk
         * data.
         */
        ReplicationSlotDropAcquired();
    }

    /*
     * If slot needed to temporarily restrain both data and catalog xmin to
     * create the catalog snapshot, remove that temporary constraint.
     * Snapshots can only be exported while the initial snapshot is still
     * acquired.
     */
    if (!TransactionIdIsValid(slot->data.xmin) &&
        TransactionIdIsValid(slot->effective_xmin))
    {
        SpinLockAcquire(&slot->mutex);
        slot->effective_xmin = InvalidTransactionId;
        SpinLockRelease(&slot->mutex);
        ReplicationSlotsComputeRequiredXmin(false);
    }

    if (slot->data.persistency == RS_PERSISTENT)
    {
        /*
         * Mark persistent slot inactive.  We're not freeing it, just
         * disconnecting, but wake up others that may be waiting for it.
         */
        SpinLockAcquire(&slot->mutex);
        slot->active_pid = 0;
        SpinLockRelease(&slot->mutex);
        ConditionVariableBroadcast(&slot->active_cv);
    }

    MyReplicationSlot = NULL;

    /* might not have been set when we've been a plain slot */
    LWLockAcquire(ProcArrayLock, LW_SHARED);
    MyProc->statusFlags &= ~PROC_IN_LOGICAL_DECODING;
    ProcGlobal->statusFlags[MyProc->pgxactoff] = MyProc->statusFlags;
    LWLockRelease(ProcArrayLock);
}

ReplicationSlotReserveWal()

void ReplicationSlotReserveWal

(

void

)

Definition at line 1081 of file slot.c.

References Assert, ReplicationSlot::data, GetRedoRecPtr(), GetXLogInsertRecPtr(), InvalidXLogRecPtr, LogStandbySnapshot(), ReplicationSlot::mutex, MyReplicationSlot, RecoveryInProgress(), ReplicationSlotsComputeRequiredLSN(), ReplicationSlotPersistentData::restart_lsn, SlotIsLogical, SpinLockAcquire, SpinLockRelease, wal_segment_size, XLByteToSeg, XLogFlush(), and XLogGetLastRemovedSegno().

Referenced by create_physical_replication_slot(), CreateInitDecodingContext(), and CreateReplicationSlot().

{
    ReplicationSlot *slot = MyReplicationSlot;

    Assert(slot != NULL);
    Assert(slot->data.restart_lsn == InvalidXLogRecPtr);

    /*
     * The replication slot mechanism is used to prevent removal of required
     * WAL. As there is no interlock between this routine and checkpoints, WAL
     * segments could concurrently be removed when a now stale return value of
     * ReplicationSlotsComputeRequiredLSN() is used. In the unlikely case that
     * this happens we'll just retry.
     */
    while (true)
    {
        XLogSegNo   segno;
        XLogRecPtr  restart_lsn;

        /*
         * For logical slots log a standby snapshot and start logical decoding
         * at exactly that position. That allows the slot to start up more
         * quickly.
         *
         * That's not needed (or indeed helpful) for physical slots as they'll
         * start replay at the last logged checkpoint anyway. Instead return
         * the location of the last redo LSN. While that slightly increases
         * the chance that we have to retry, it's where a base backup has to
         * start replay at.
         */
        if (!RecoveryInProgress() && SlotIsLogical(slot))
        {
            XLogRecPtr  flushptr;

            /* start at current insert position */
            restart_lsn = GetXLogInsertRecPtr();
            SpinLockAcquire(&slot->mutex);
            slot->data.restart_lsn = restart_lsn;
            SpinLockRelease(&slot->mutex);

            /* make sure we have enough information to start */
            flushptr = LogStandbySnapshot();

            /* and make sure it's fsynced to disk */
            XLogFlush(flushptr);
        }
        else
        {
            restart_lsn = GetRedoRecPtr();
            SpinLockAcquire(&slot->mutex);
            slot->data.restart_lsn = restart_lsn;
            SpinLockRelease(&slot->mutex);
        }

        /* prevent WAL removal as fast as possible */
        ReplicationSlotsComputeRequiredLSN();

        /*
         * If all required WAL is still there, great, otherwise retry. The
         * slot should prevent further removal of WAL, unless there's a
         * concurrent ReplicationSlotsComputeRequiredLSN() after we've written
         * the new restart_lsn above, so normally we should never need to loop
         * more than twice.
         */
        XLByteToSeg(slot->data.restart_lsn, segno, wal_segment_size);
        if (XLogGetLastRemovedSegno() < segno)
            break;
    }
}

ReplicationSlotSave()

void ReplicationSlotSave

(

void

)

Definition at line 710 of file slot.c.

References Assert, ReplicationSlot::data, ERROR, MAXPGPATH, ReplicationSlotPersistentData::name, NameStr, SaveSlotToPath(), and sprintf.

Referenced by copy_replication_slot(), create_physical_replication_slot(), CreateDecodingContext(), CreateInitDecodingContext(), CreateReplicationSlot(), InvalidatePossiblyObsoleteSlot(), LogicalConfirmReceivedLocation(), and ReplicationSlotPersist().

{
    char        path[MAXPGPATH];

    Assert(MyReplicationSlot != NULL);

    sprintf(path, "pg_replslot/%s", NameStr(MyReplicationSlot->data.name));
    SaveSlotToPath(MyReplicationSlot, path, ERROR);
}

ReplicationSlotsComputeLogicalRestartLSN()

XLogRecPtr ReplicationSlotsComputeLogicalRestartLSN

(

void

)

Definition at line 860 of file slot.c.

References ReplicationSlot::data, i, ReplicationSlot::in_use, InvalidXLogRecPtr, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, ReplicationSlot::mutex, ReplicationSlotCtlData::replication_slots, ReplicationSlotPersistentData::restart_lsn, SlotIsLogical, SpinLockAcquire, and SpinLockRelease.

Referenced by CheckPointLogicalRewriteHeap(), and CheckPointSnapBuild().

{
    XLogRecPtr  result = InvalidXLogRecPtr;
    int         i;

    if (max_replication_slots <= 0)
        return InvalidXLogRecPtr;

    LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);

    for (i = 0; i < max_replication_slots; i++)
    {
        ReplicationSlot *s;
        XLogRecPtr  restart_lsn;

        s = &ReplicationSlotCtl->replication_slots[i];

        /* cannot change while ReplicationSlotCtlLock is held */
        if (!s->in_use)
            continue;

        /* we're only interested in logical slots */
        if (!SlotIsLogical(s))
            continue;

        /* read once, it's ok if it increases while we're checking */
        SpinLockAcquire(&s->mutex);
        restart_lsn = s->data.restart_lsn;
        SpinLockRelease(&s->mutex);

        if (restart_lsn == InvalidXLogRecPtr)
            continue;

        if (result == InvalidXLogRecPtr ||
            restart_lsn < result)
            result = restart_lsn;
    }

    LWLockRelease(ReplicationSlotControlLock);

    return result;
}

ReplicationSlotsComputeRequiredLSN()

void ReplicationSlotsComputeRequiredLSN

(

void

)

Definition at line 817 of file slot.c.

References Assert, ReplicationSlot::data, i, ReplicationSlot::in_use, InvalidXLogRecPtr, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, ReplicationSlot::mutex, ReplicationSlotCtlData::replication_slots, ReplicationSlotPersistentData::restart_lsn, SpinLockAcquire, SpinLockRelease, and XLogSetReplicationSlotMinimumLSN().

Referenced by copy_replication_slot(), InvalidateObsoleteReplicationSlots(), LogicalConfirmReceivedLocation(), pg_replication_slot_advance(), PhysicalConfirmReceivedLocation(), ReplicationSlotDropPtr(), ReplicationSlotReserveWal(), and StartupReplicationSlots().

{
    int         i;
    XLogRecPtr  min_required = InvalidXLogRecPtr;

    Assert(ReplicationSlotCtl != NULL);

    LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);
    for (i = 0; i < max_replication_slots; i++)
    {
        ReplicationSlot *s = &ReplicationSlotCtl->replication_slots[i];
        XLogRecPtr  restart_lsn;

        if (!s->in_use)
            continue;

        SpinLockAcquire(&s->mutex);
        restart_lsn = s->data.restart_lsn;
        SpinLockRelease(&s->mutex);

        if (restart_lsn != InvalidXLogRecPtr &&
            (min_required == InvalidXLogRecPtr ||
             restart_lsn < min_required))
            min_required = restart_lsn;
    }
    LWLockRelease(ReplicationSlotControlLock);

    XLogSetReplicationSlotMinimumLSN(min_required);
}

ReplicationSlotsComputeRequiredXmin()

void ReplicationSlotsComputeRequiredXmin

(

bool

already_locked

)

Definition at line 767 of file slot.c.

References Assert, ReplicationSlot::effective_catalog_xmin, ReplicationSlot::effective_xmin, i, ReplicationSlot::in_use, InvalidTransactionId, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, ReplicationSlot::mutex, ProcArraySetReplicationSlotXmin(), ReplicationSlotCtlData::replication_slots, SpinLockAcquire, SpinLockRelease, TransactionIdIsValid, and TransactionIdPrecedes().

Referenced by copy_replication_slot(), CreateInitDecodingContext(), InvalidateObsoleteReplicationSlots(), LogicalConfirmReceivedLocation(), pg_replication_slot_advance(), PhysicalReplicationSlotNewXmin(), ReplicationSlotDropPtr(), ReplicationSlotRelease(), and StartupReplicationSlots().

{
    int         i;
    TransactionId agg_xmin = InvalidTransactionId;
    TransactionId agg_catalog_xmin = InvalidTransactionId;

    Assert(ReplicationSlotCtl != NULL);

    LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);

    for (i = 0; i < max_replication_slots; i++)
    {
        ReplicationSlot *s = &ReplicationSlotCtl->replication_slots[i];
        TransactionId effective_xmin;
        TransactionId effective_catalog_xmin;

        if (!s->in_use)
            continue;

        SpinLockAcquire(&s->mutex);
        effective_xmin = s->effective_xmin;
        effective_catalog_xmin = s->effective_catalog_xmin;
        SpinLockRelease(&s->mutex);

        /* check the data xmin */
        if (TransactionIdIsValid(effective_xmin) &&
            (!TransactionIdIsValid(agg_xmin) ||
             TransactionIdPrecedes(effective_xmin, agg_xmin)))
            agg_xmin = effective_xmin;

        /* check the catalog xmin */
        if (TransactionIdIsValid(effective_catalog_xmin) &&
            (!TransactionIdIsValid(agg_catalog_xmin) ||
             TransactionIdPrecedes(effective_catalog_xmin, agg_catalog_xmin)))
            agg_catalog_xmin = effective_catalog_xmin;
    }

    LWLockRelease(ReplicationSlotControlLock);

    ProcArraySetReplicationSlotXmin(agg_xmin, agg_catalog_xmin, already_locked);
}

ReplicationSlotsCountDBSlots()

bool ReplicationSlotsCountDBSlots	(	Oid	dboid,
		int *	nslots,
		int *	nactive
	)

Definition at line 912 of file slot.c.

References ReplicationSlot::active_pid, ReplicationSlot::data, ReplicationSlotPersistentData::database, i, ReplicationSlot::in_use, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, ReplicationSlot::mutex, ReplicationSlotCtlData::replication_slots, SlotIsLogical, SpinLockAcquire, and SpinLockRelease.

Referenced by dropdb().

{
    int         i;

    *nslots = *nactive = 0;

    if (max_replication_slots <= 0)
        return false;

    LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);
    for (i = 0; i < max_replication_slots; i++)
    {
        ReplicationSlot *s;

        s = &ReplicationSlotCtl->replication_slots[i];

        /* cannot change while ReplicationSlotCtlLock is held */
        if (!s->in_use)
            continue;

        /* only logical slots are database specific, skip */
        if (!SlotIsLogical(s))
            continue;

        /* not our database, skip */
        if (s->data.database != dboid)
            continue;

        /* count slots with spinlock held */
        SpinLockAcquire(&s->mutex);
        (*nslots)++;
        if (s->active_pid != 0)
            (*nactive)++;
        SpinLockRelease(&s->mutex);
    }
    LWLockRelease(ReplicationSlotControlLock);

    if (*nslots > 0)
        return true;
    return false;
}

ReplicationSlotsDropDBSlots()

void ReplicationSlotsDropDBSlots

(

Oid

dboid

)

Definition at line 968 of file slot.c.

References ReplicationSlot::active_pid, ReplicationSlot::data, ReplicationSlotPersistentData::database, ereport, errcode(), errmsg(), ERROR, i, ReplicationSlot::in_use, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, ReplicationSlot::mutex, MyProcPid, ReplicationSlotPersistentData::name, NameStr, ReplicationSlotCtlData::replication_slots, ReplicationSlotDropAcquired(), SlotIsLogical, SpinLockAcquire, and SpinLockRelease.

Referenced by dbase_redo(), and dropdb().

{
    int         i;

    if (max_replication_slots <= 0)
        return;

restart:
    LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);
    for (i = 0; i < max_replication_slots; i++)
    {
        ReplicationSlot *s;
        char       *slotname;
        int         active_pid;

        s = &ReplicationSlotCtl->replication_slots[i];

        /* cannot change while ReplicationSlotCtlLock is held */
        if (!s->in_use)
            continue;

        /* only logical slots are database specific, skip */
        if (!SlotIsLogical(s))
            continue;

        /* not our database, skip */
        if (s->data.database != dboid)
            continue;

        /* acquire slot, so ReplicationSlotDropAcquired can be reused  */
        SpinLockAcquire(&s->mutex);
        /* can't change while ReplicationSlotControlLock is held */
        slotname = NameStr(s->data.name);
        active_pid = s->active_pid;
        if (active_pid == 0)
        {
            MyReplicationSlot = s;
            s->active_pid = MyProcPid;
        }
        SpinLockRelease(&s->mutex);

        /*
         * Even though we hold an exclusive lock on the database object a
         * logical slot for that DB can still be active, e.g. if it's
         * concurrently being dropped by a backend connected to another DB.
         *
         * That's fairly unlikely in practice, so we'll just bail out.
         */
        if (active_pid)
            ereport(ERROR,
                    (errcode(ERRCODE_OBJECT_IN_USE),
                     errmsg("replication slot \"%s\" is active for PID %d",
                            slotname, active_pid)));

        /*
         * To avoid duplicating ReplicationSlotDropAcquired() and to avoid
         * holding ReplicationSlotControlLock over filesystem operations,
         * release ReplicationSlotControlLock and use
         * ReplicationSlotDropAcquired.
         *
         * As that means the set of slots could change, restart scan from the
         * beginning each time we release the lock.
         */
        LWLockRelease(ReplicationSlotControlLock);
        ReplicationSlotDropAcquired();
        goto restart;
    }
    LWLockRelease(ReplicationSlotControlLock);
}

ReplicationSlotsShmemInit()

void ReplicationSlotsShmemInit

(

void

)

Definition at line 132 of file slot.c.

References ReplicationSlot::active_cv, ConditionVariableInit(), i, ReplicationSlot::io_in_progress_lock, LWLockInitialize(), LWTRANCHE_REPLICATION_SLOT_IO, max_replication_slots, MemSet, ReplicationSlot::mutex, ReplicationSlotCtlData::replication_slots, ReplicationSlotsShmemSize(), ShmemInitStruct(), and SpinLockInit.

Referenced by CreateSharedMemoryAndSemaphores().

{
    bool        found;

    if (max_replication_slots == 0)
        return;

    ReplicationSlotCtl = (ReplicationSlotCtlData *)
        ShmemInitStruct("ReplicationSlot Ctl", ReplicationSlotsShmemSize(),
                        &found);

    if (!found)
    {
        int         i;

        /* First time through, so initialize */
        MemSet(ReplicationSlotCtl, 0, ReplicationSlotsShmemSize());

        for (i = 0; i < max_replication_slots; i++)
        {
            ReplicationSlot *slot = &ReplicationSlotCtl->replication_slots[i];

            /* everything else is zeroed by the memset above */
            SpinLockInit(&slot->mutex);
            LWLockInitialize(&slot->io_in_progress_lock,
                             LWTRANCHE_REPLICATION_SLOT_IO);
            ConditionVariableInit(&slot->active_cv);
        }
    }
}

ReplicationSlotsShmemSize()

Size ReplicationSlotsShmemSize

(

void

)

Definition at line 114 of file slot.c.

References add_size(), max_replication_slots, mul_size(), and offsetof.

Referenced by CalculateShmemSize(), and ReplicationSlotsShmemInit().

{
    Size        size = 0;

    if (max_replication_slots == 0)
        return size;

    size = offsetof(ReplicationSlotCtlData, replication_slots);
    size = add_size(size,
                    mul_size(max_replication_slots, sizeof(ReplicationSlot)));

    return size;
}

ReplicationSlotValidateName()

bool ReplicationSlotValidateName	(	const char *	name,
		int	elevel
	)

Definition at line 172 of file slot.c.

References ereport, errcode(), errhint(), errmsg(), and NAMEDATALEN.

Referenced by check_primary_slot_name(), parse_subscription_options(), ReplicationSlotCreate(), and StartupReorderBuffer().

{
    const char *cp;

    if (strlen(name) == 0)
    {
        ereport(elevel,
                (errcode(ERRCODE_INVALID_NAME),
                 errmsg("replication slot name \"%s\" is too short",
                        name)));
        return false;
    }

    if (strlen(name) >= NAMEDATALEN)
    {
        ereport(elevel,
                (errcode(ERRCODE_NAME_TOO_LONG),
                 errmsg("replication slot name \"%s\" is too long",
                        name)));
        return false;
    }

    for (cp = name; *cp; cp++)
    {
        if (!((*cp >= 'a' && *cp <= 'z')
              || (*cp >= '0' && *cp <= '9')
              || (*cp == '_')))
        {
            ereport(elevel,
                    (errcode(ERRCODE_INVALID_NAME),
                     errmsg("replication slot name \"%s\" contains invalid character",
                            name),
                     errhint("Replication slot names may only contain lower case letters, numbers, and the underscore character.")));
            return false;
        }
    }
    return true;
}

SearchNamedReplicationSlot()

ReplicationSlot* SearchNamedReplicationSlot	(	const char *	name,
		bool	need_lock
	)

Definition at line 348 of file slot.c.

References ReplicationSlot::data, i, ReplicationSlot::in_use, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_replication_slots, ReplicationSlotPersistentData::name, NameStr, and ReplicationSlotCtlData::replication_slots.

Referenced by pg_stat_reset_replication_slot(), pgstat_vacuum_stat(), and ReplicationSlotAcquire().

{
    int         i;
    ReplicationSlot *slot = NULL;

    if (need_lock)
        LWLockAcquire(ReplicationSlotControlLock, LW_SHARED);

    for (i = 0; i < max_replication_slots; i++)
    {
        ReplicationSlot *s = &ReplicationSlotCtl->replication_slots[i];

        if (s->in_use && strcmp(name, NameStr(s->data.name)) == 0)
        {
            slot = s;
            break;
        }
    }

    if (need_lock)
        LWLockRelease(ReplicationSlotControlLock);

    return slot;
}

StartupReplicationSlots()

void StartupReplicationSlots

(

void

)

Definition at line 1395 of file slot.c.

References AllocateDir(), dirent::d_name, DEBUG1, elog, ereport, errmsg(), FreeDir(), fsync_fname(), lstat, max_replication_slots, MAXPGPATH, pg_str_endswith(), ReadDir(), ReplicationSlotsComputeRequiredLSN(), ReplicationSlotsComputeRequiredXmin(), RestoreSlotFromDisk(), rmtree(), S_ISDIR, snprintf, stat::st_mode, and WARNING.

Referenced by StartupXLOG().

{
    DIR        *replication_dir;
    struct dirent *replication_de;

    elog(DEBUG1, "starting up replication slots");

    /* restore all slots by iterating over all on-disk entries */
    replication_dir = AllocateDir("pg_replslot");
    while ((replication_de = ReadDir(replication_dir, "pg_replslot")) != NULL)
    {
        struct stat statbuf;
        char        path[MAXPGPATH + 12];

        if (strcmp(replication_de->d_name, ".") == 0 ||
            strcmp(replication_de->d_name, "..") == 0)
            continue;

        snprintf(path, sizeof(path), "pg_replslot/%s", replication_de->d_name);

        /* we're only creating directories here, skip if it's not our's */
        if (lstat(path, &statbuf) == 0 && !S_ISDIR(statbuf.st_mode))
            continue;

        /* we crashed while a slot was being setup or deleted, clean up */
        if (pg_str_endswith(replication_de->d_name, ".tmp"))
        {
            if (!rmtree(path, true))
            {
                ereport(WARNING,
                        (errmsg("could not remove directory \"%s\"",
                                path)));
                continue;
            }
            fsync_fname("pg_replslot", true);
            continue;
        }

        /* looks like a slot in a normal state, restore */
        RestoreSlotFromDisk(replication_de->d_name);
    }
    FreeDir(replication_dir);

    /* currently no slots exist, we're done. */
    if (max_replication_slots <= 0)
        return;

    /* Now that we have recovered all the data, compute replication xmin */
    ReplicationSlotsComputeRequiredXmin(false);
    ReplicationSlotsComputeRequiredLSN();
}

Variable Documentation

max_replication_slots

PGDLLIMPORT int max_replication_slots

Definition at line 99 of file slot.c.

Referenced by CheckPointReplicationOrigin(), CheckPointReplicationSlots(), CheckSlotRequirements(), copy_replication_slot(), InvalidateObsoleteReplicationSlots(), logicalrep_worker_launch(), pg_get_replication_slots(), pg_show_replication_origin_status(), ReplicationOriginShmemInit(), ReplicationOriginShmemSize(), ReplicationSlotCleanup(), ReplicationSlotCreate(), ReplicationSlotsComputeLogicalRestartLSN(), ReplicationSlotsComputeRequiredLSN(), ReplicationSlotsComputeRequiredXmin(), ReplicationSlotsCountDBSlots(), ReplicationSlotsDropDBSlots(), ReplicationSlotsShmemInit(), ReplicationSlotsShmemSize(), replorigin_advance(), replorigin_check_prerequisites(), replorigin_drop_guts(), replorigin_get_progress(), replorigin_redo(), replorigin_session_reset(), replorigin_session_setup(), RestoreSlotFromDisk(), SearchNamedReplicationSlot(), StartupReplicationOrigin(), and StartupReplicationSlots().

MyReplicationSlot

PGDLLIMPORT ReplicationSlot* MyReplicationSlot

Definition at line 96 of file slot.c.

Referenced by copy_replication_slot(), create_logical_replication_slot(), create_physical_replication_slot(), CreateDecodingContext(), CreateInitDecodingContext(), CreateReplicationSlot(), LogicalConfirmReceivedLocation(), LogicalIncreaseRestartDecodingForSlot(), LogicalIncreaseXminForSlot(), pg_create_logical_replication_slot(), pg_create_physical_replication_slot(), pg_logical_replication_slot_advance(), pg_logical_slot_get_changes_guts(), pg_physical_replication_slot_advance(), pg_replication_slot_advance(), PhysicalConfirmReceivedLocation(), PhysicalReplicationSlotNewXmin(), PostgresMain(), ProcessStandbyHSFeedbackMessage(), ProcessStandbyReplyMessage(), ProcKill(), ReorderBufferAllocate(), ReorderBufferFree(), ReorderBufferRestoreChanges(), ReorderBufferRestoreCleanup(), ReorderBufferSerializedPath(), ReorderBufferSerializeTXN(), ReplicationSlotDropAcquired(), ReplicationSlotMarkDirty(), ReplicationSlotPersist(), ReplicationSlotRelease(), ReplicationSlotReserveWal(), StartLogicalReplication(), StartReplication(), StartupDecodingContext(), and WalSndErrorCleanup().

ReplicationSlotCtl

PGDLLIMPORT ReplicationSlotCtlData* ReplicationSlotCtl

Definition at line 93 of file slot.c.

Referenced by copy_replication_slot(), and pg_get_replication_slots().