Measure WaitLatch's timeout parameter in milliseconds, not microseconds.

The original definition had the problem that timeouts exceeding about 2100
seconds couldn't be specified on 32-bit machines.  Milliseconds seem like
sufficient resolution, and finer grain than that would be fantasy anyway
on many platforms.

Back-patch to 9.1 so that this aspect of the latch API won't change between
9.1 and later releases.

Peter Geoghegan

src/backend/access/transam/xlog.c

@@ -10161,7 +10161,7 @@ retry:
 					/*
 					 * Wait for more WAL to arrive, or timeout to be reached
 					 */
-					WaitLatch(&XLogCtl->recoveryWakeupLatch, 5000000L);
+					WaitLatch(&XLogCtl->recoveryWakeupLatch, 5000L);
 					ResetLatch(&XLogCtl->recoveryWakeupLatch);
 				}
 				else

src/backend/port/unix_latch.c

@@ -134,7 +134,7 @@ DisownLatch(volatile Latch *latch)
  * Wait for given latch to be set or until timeout is exceeded.
  * If the latch is already set, the function returns immediately.
  *
- * The 'timeout' is given in microseconds, and -1 means wait forever.
+ * The 'timeout' is given in milliseconds, and -1 means wait forever.
  * On some platforms, signals cause the timeout to be restarted, so beware
  * that the function can sleep for several times longer than the specified
  * timeout.
@@ -173,8 +173,8 @@ WaitLatchOrSocket(volatile Latch *latch, pgsocket sock, bool forRead,
 	/* Initialize timeout */
 	if (timeout >= 0)
 	{
-		tv.tv_sec = timeout / 1000000L;
-		tv.tv_usec = timeout % 1000000L;
+		tv.tv_sec = timeout / 1000L;
+		tv.tv_usec = (timeout % 1000L) * 1000L;
 		tvp = &tv;
 	}
 

src/backend/port/win32_latch.c

@@ -137,7 +137,7 @@ WaitLatchOrSocket(volatile Latch *latch, pgsocket sock, bool forRead,
 		}
 
 		rc = WaitForMultipleObjects(numevents, events, FALSE,
-							   (timeout >= 0) ? (timeout / 1000) : INFINITE);
+							   (timeout >= 0) ? timeout : INFINITE);
 		if (rc == WAIT_FAILED)
 			elog(ERROR, "WaitForMultipleObjects() failed: error code %d", (int) GetLastError());
 		else if (rc == WAIT_TIMEOUT)

src/backend/replication/syncrep.c

@@ -251,7 +251,7 @@ SyncRepWaitForLSN(XLogRecPtr XactCommitLSN)
 		 * cancel/die signal or postmaster death regularly while waiting. Note
 		 * that timeout here does not necessarily release from loop.
 		 */
-		WaitLatch(&MyProc->waitLatch, 60000000L);
+		WaitLatch(&MyProc->waitLatch, 60000L);
 	}
 
 	/*

src/backend/replication/walsender.c

@@ -807,7 +807,7 @@ WalSndLoop(void)
 			/* Sleep */
 			WaitLatchOrSocket(&MyWalSnd->latch, MyProcPort->sock,
 							  true, pq_is_send_pending(),
-							  sleeptime * 1000L);
+							  sleeptime);
 
 			/* Check for replication timeout */
 			if (replication_timeout > 0 &&