PGRPROC

<div style="background-color:"><div>if pgproc is used to represent a process and proclock represents a process and its
locksof interest, then why does pgproc contain the following information about locks?</div><div><font color="#008000"
size="2"><p>/*<p>*XLOG location of first XLOG record written by this backend's<p>* current transaction. If backend is
notin a transaction or hasn't<p>* yet modified anything, logRec.xrecoff is zero.<p>*/</font><font
size="2"><p>XLogRecPtrlogRec;<p></font><font color="#008000" size="2">/* Info about LWLock the process is currently
waitingfor, if any. */</font><font size="2"><p></font><font color="#0000ff" size="2">bool</font><font size="2">
lwWaiting;</font><font color="#008000" size="2">/* true if waiting for an LW lock */</font><font
size="2"><p></font><fontcolor="#0000ff" size="2">bool</font><font size="2"> lwExclusive; </font><font color="#008000"
size="2">/*true if waiting for exclusive access */</font><font size="2"><p></font><font color="#0000ff"
size="2">struct</font><fontsize="2"> PGPROC *lwWaitLink; </font><font color="#008000" size="2">/* next waiter for same
LWlock */</font><font size="2"><p></font><font color="#008000" size="2">/* Info about lock the process is currently
waitingfor, if any. */</font><font size="2"><p></font><font color="#008000" size="2">/* waitLock and waitHolder are
NULLif not currently waiting. */</font><font size="2"><p>LOCK *waitLock; </font><font color="#008000" size="2">/* Lock
objectwe're sleeping on ... */</font><font size="2"><p>PROCLOCK *waitHolder; </font><font color="#008000" size="2">/*
Per-holderinfo for awaited lock */</font><font size="2"><p>LOCKMODE waitLockMode; </font><font color="#008000"
size="2">/*type of lock we're waiting for */</font><font size="2"><p>LOCKMASK heldLocks; </font><font color="#008000"
size="2">/*bitmask for lock types already held on <p>* this lock object by this backend */</font><font
size="2"><p>SHM_QUEUEprocHolders; </font><font color="#008000" size="2">/* list of PROCLOCK objects for locks held <p>*
orawaited by this backend */</font><font size="2"><p>};</font></div></div><br clear="all" /><hr />MSN 8 with <a
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