mxactdesc.c File Reference

#include "postgres.h"
#include "access/multixact.h"

Include dependency graph for mxactdesc.c:

Go to the source code of this file.

Functions
static void	out_member (StringInfo buf, MultiXactMember *member)
void	multixact_desc (StringInfo buf, XLogReaderState *record)
const char *	multixact_identify (uint8 info)

Function Documentation

multixact_desc()

void multixact_desc	(	StringInfo	buf,
		XLogReaderState *	record
	)

Definition at line 50 of file mxactdesc.c.

{
    char       *rec = XLogRecGetData(record);
    uint8       info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
 
    if (info == XLOG_MULTIXACT_ZERO_OFF_PAGE ||
        info == XLOG_MULTIXACT_ZERO_MEM_PAGE)
    {
        int64       pageno;
 
        memcpy(&pageno, rec, sizeof(pageno));
        appendStringInfo(buf, "%lld", (long long) pageno);
    }
    else if (info == XLOG_MULTIXACT_CREATE_ID)
    {
        xl_multixact_create *xlrec = (xl_multixact_create *) rec;
        int         i;
 
        appendStringInfo(buf, "%u offset %u nmembers %d: ", xlrec->mid,
                         xlrec->moff, xlrec->nmembers);
        for (i = 0; i < xlrec->nmembers; i++)
            out_member(buf, &xlrec->members[i]);
    }
    else if (info == XLOG_MULTIXACT_TRUNCATE_ID)
    {
        xl_multixact_truncate *xlrec = (xl_multixact_truncate *) rec;
 
        appendStringInfo(buf, "offsets [%u, %u), members [%u, %u)",
                         xlrec->startTruncOff, xlrec->endTruncOff,
                         xlrec->startTruncMemb, xlrec->endTruncMemb);
    }
}

References appendStringInfo(), buf, xl_multixact_truncate::endTruncMemb, xl_multixact_truncate::endTruncOff, i, xl_multixact_create::members, xl_multixact_create::mid, xl_multixact_create::moff, xl_multixact_create::nmembers, out_member(), xl_multixact_truncate::startTruncMemb, xl_multixact_truncate::startTruncOff, XLOG_MULTIXACT_CREATE_ID, XLOG_MULTIXACT_TRUNCATE_ID, XLOG_MULTIXACT_ZERO_MEM_PAGE, XLOG_MULTIXACT_ZERO_OFF_PAGE, XLogRecGetData, XLogRecGetInfo, and XLR_INFO_MASK.

multixact_identify()

const char* multixact_identify

(

uint8

info

)

Definition at line 84 of file mxactdesc.c.

{
    const char *id = NULL;
 
    switch (info & ~XLR_INFO_MASK)
    {
        case XLOG_MULTIXACT_ZERO_OFF_PAGE:
            id = "ZERO_OFF_PAGE";
            break;
        case XLOG_MULTIXACT_ZERO_MEM_PAGE:
            id = "ZERO_MEM_PAGE";
            break;
        case XLOG_MULTIXACT_CREATE_ID:
            id = "CREATE_ID";
            break;
        case XLOG_MULTIXACT_TRUNCATE_ID:
            id = "TRUNCATE_ID";
            break;
    }
 
    return id;
}

References XLOG_MULTIXACT_CREATE_ID, XLOG_MULTIXACT_TRUNCATE_ID, XLOG_MULTIXACT_ZERO_MEM_PAGE, XLOG_MULTIXACT_ZERO_OFF_PAGE, and XLR_INFO_MASK.

out_member()

static void out_member ( StringInfo  buf, MultiXactMember *  member  )

static

Definition at line 20 of file mxactdesc.c.

{
    appendStringInfo(buf, "%u ", member->xid);
    switch (member->status)
    {
        case MultiXactStatusForKeyShare:
            appendStringInfoString(buf, "(keysh) ");
            break;
        case MultiXactStatusForShare:
            appendStringInfoString(buf, "(sh) ");
            break;
        case MultiXactStatusForNoKeyUpdate:
            appendStringInfoString(buf, "(fornokeyupd) ");
            break;
        case MultiXactStatusForUpdate:
            appendStringInfoString(buf, "(forupd) ");
            break;
        case MultiXactStatusNoKeyUpdate:
            appendStringInfoString(buf, "(nokeyupd) ");
            break;
        case MultiXactStatusUpdate:
            appendStringInfoString(buf, "(upd) ");
            break;
        default:
            appendStringInfoString(buf, "(unk) ");
            break;
    }
}

References appendStringInfo(), appendStringInfoString(), buf, MultiXactStatusForKeyShare, MultiXactStatusForNoKeyUpdate, MultiXactStatusForShare, MultiXactStatusForUpdate, MultiXactStatusNoKeyUpdate, MultiXactStatusUpdate, MultiXactMember::status, and MultiXactMember::xid.

Referenced by multixact_desc().