--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/persistentstorage/sql/SQLite/status.c	Fri Jan 22 11:06:30 2010 +0200
@@ -0,0 +1,111 @@
+/*
+** 2008 June 18
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+** This module implements the sqlite3_status() interface and related
+** functionality.
+**
+** $Id: status.c,v 1.7 2008/08/05 17:53:23 drh Exp $
+*/
+#include "sqliteInt.h"
+
+/*
+** Variables in which to record status information.
+*/
+static struct {
+  int nowValue[9];         /* Current value */
+  int mxValue[9];          /* Maximum value */
+} sqlite3Stat;
+
+
+/*
+** Reset the status records.  This routine is called by
+** sqlite3_initialize().
+*/
+void sqlite3StatusReset(void){
+  memset(&sqlite3Stat, 0, sizeof(sqlite3Stat));
+}
+
+/*
+** Return the current value of a status parameter.
+*/
+int sqlite3StatusValue(int op){
+  assert( op>=0 && op<ArraySize(sqlite3Stat.nowValue) );
+  return sqlite3Stat.nowValue[op];
+}
+
+/*
+** Add N to the value of a status record.  It is assumed that the
+** caller holds appropriate locks.
+*/
+void sqlite3StatusAdd(int op, int N){
+  assert( op>=0 && op<ArraySize(sqlite3Stat.nowValue) );
+  sqlite3Stat.nowValue[op] += N;
+  if( sqlite3Stat.nowValue[op]>sqlite3Stat.mxValue[op] ){
+    sqlite3Stat.mxValue[op] = sqlite3Stat.nowValue[op];
+  }
+}
+
+/*
+** Set the value of a status to X.
+*/
+void sqlite3StatusSet(int op, int X){
+  assert( op>=0 && op<ArraySize(sqlite3Stat.nowValue) );
+  sqlite3Stat.nowValue[op] = X;
+  if( sqlite3Stat.nowValue[op]>sqlite3Stat.mxValue[op] ){
+    sqlite3Stat.mxValue[op] = sqlite3Stat.nowValue[op];
+  }
+}
+
+/*
+** Query status information.
+**
+** This implementation assumes that reading or writing an aligned
+** 32-bit integer is an atomic operation.  If that assumption is not true,
+** then this routine is not threadsafe.
+*/
+int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag){
+  if( op<0 || op>=ArraySize(sqlite3Stat.nowValue) ){
+    return SQLITE_MISUSE;
+  }
+  *pCurrent = sqlite3Stat.nowValue[op];
+  *pHighwater = sqlite3Stat.mxValue[op];
+  if( resetFlag ){
+    sqlite3Stat.mxValue[op] = sqlite3Stat.nowValue[op];
+  }
+  return SQLITE_OK;
+}
+
+/*
+** Query status information for a single database connection
+*/
+int sqlite3_db_status(
+  sqlite3 *db,          /* The database connection whose status is desired */
+  int op,               /* Status verb */
+  int *pCurrent,        /* Write current value here */
+  int *pHighwater,      /* Write high-water mark here */
+  int resetFlag         /* Reset high-water mark if true */
+){
+  switch( op ){
+    case SQLITE_DBSTATUS_LOOKASIDE_USED: {
+      *pCurrent = db->lookaside.nOut;
+      *pHighwater = db->lookaside.mxOut;
+      if( resetFlag ){
+        db->lookaside.mxOut = db->lookaside.nOut;
+      }
+      break;
+    }
+    default: {
+      return SQLITE_ERROR;
+    }
+  }
+  return SQLITE_OK;
+}