[sql] Import SQLite 3.17.0.

third_party/sqlite/src/src/status.c

 /*
 ** 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.
 **
@@ skipping 140 matching lines @@
   *pCurrent = wsdStat.nowValue[op];
   *pHighwater = wsdStat.mxValue[op];
   if( resetFlag ){
     wsdStat.mxValue[op] = wsdStat.nowValue[op];
   }
   sqlite3_mutex_leave(pMutex);
   (void)pMutex;  /* Prevent warning when SQLITE_THREADSAFE=0 */
   return SQLITE_OK;
 }
 int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag){
-  sqlite3_int64 iCur, iHwtr;
+  sqlite3_int64 iCur = 0, iHwtr = 0;
   int rc;
 #ifdef SQLITE_ENABLE_API_ARMOR
   if( pCurrent==0 || pHighwater==0 ) return SQLITE_MISUSE_BKPT;
 #endif
   rc = sqlite3_status64(op, &iCur, &iHwtr, resetFlag);
   if( rc==0 ){
     *pCurrent = (int)iCur;
     *pHighwater = (int)iHwtr;
   }
   return rc;
@@ skipping 40 matching lines @@
         db->lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT] = 0;
       }
       break;
     }
 
     /* 
     ** Return an approximation for the amount of memory currently used
     ** by all pagers associated with the given database connection.  The
     ** highwater mark is meaningless and is returned as zero.
     */
+    case SQLITE_DBSTATUS_CACHE_USED_SHARED:
     case SQLITE_DBSTATUS_CACHE_USED: {
       int totalUsed = 0;
       int i;
       sqlite3BtreeEnterAll(db);
       for(i=0; i<db->nDb; i++){
         Btree *pBt = db->aDb[i].pBt;
         if( pBt ){
           Pager *pPager = sqlite3BtreePager(pBt);
-          totalUsed += sqlite3PagerMemUsed(pPager);
+          int nByte = sqlite3PagerMemUsed(pPager);
+          if( op==SQLITE_DBSTATUS_CACHE_USED_SHARED ){
+            nByte = nByte / sqlite3BtreeConnectionCount(pBt);
+          }
+          totalUsed += nByte;
         }
       }
       sqlite3BtreeLeaveAll(db);
       *pCurrent = totalUsed;
       *pHighwater = 0;
       break;
     }
 
     /*
     ** *pCurrent gets an accurate estimate of the amount of memory used
@@ skipping 96 matching lines @@
       break;
     }
 
     default: {
       rc = SQLITE_ERROR;
     }
   }
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }