| /* |
| ** 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. |
| */ |
| #include "sqliteInt.h" |
| #include "vdbeInt.h" |
| |
| /* |
| ** Variables in which to record status information. |
| */ |
| typedef struct sqlite3StatType sqlite3StatType; |
| static SQLITE_WSD struct sqlite3StatType { |
| int nowValue[10]; /* Current value */ |
| int mxValue[10]; /* Maximum value */ |
| } sqlite3Stat = { {0,}, {0,} }; |
| |
| |
| /* The "wsdStat" macro will resolve to the status information |
| ** state vector. If writable static data is unsupported on the target, |
| ** we have to locate the state vector at run-time. In the more common |
| ** case where writable static data is supported, wsdStat can refer directly |
| ** to the "sqlite3Stat" state vector declared above. |
| */ |
| #ifdef SQLITE_OMIT_WSD |
| # define wsdStatInit sqlite3StatType *x = &GLOBAL(sqlite3StatType,sqlite3Stat) |
| # define wsdStat x[0] |
| #else |
| # define wsdStatInit |
| # define wsdStat sqlite3Stat |
| #endif |
| |
| /* |
| ** Return the current value of a status parameter. |
| */ |
| int sqlite3StatusValue(int op){ |
| wsdStatInit; |
| assert( op>=0 && op<ArraySize(wsdStat.nowValue) ); |
| return wsdStat.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){ |
| wsdStatInit; |
| assert( op>=0 && op<ArraySize(wsdStat.nowValue) ); |
| wsdStat.nowValue[op] += N; |
| if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){ |
| wsdStat.mxValue[op] = wsdStat.nowValue[op]; |
| } |
| } |
| |
| /* |
| ** Set the value of a status to X. |
| */ |
| void sqlite3StatusSet(int op, int X){ |
| wsdStatInit; |
| assert( op>=0 && op<ArraySize(wsdStat.nowValue) ); |
| wsdStat.nowValue[op] = X; |
| if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){ |
| wsdStat.mxValue[op] = wsdStat.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){ |
| wsdStatInit; |
| if( op<0 || op>=ArraySize(wsdStat.nowValue) ){ |
| return SQLITE_MISUSE_BKPT; |
| } |
| *pCurrent = wsdStat.nowValue[op]; |
| *pHighwater = wsdStat.mxValue[op]; |
| if( resetFlag ){ |
| wsdStat.mxValue[op] = wsdStat.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 */ |
| ){ |
| int rc = SQLITE_OK; /* Return code */ |
| sqlite3_mutex_enter(db->mutex); |
| switch( op ){ |
| case SQLITE_DBSTATUS_LOOKASIDE_USED: { |
| *pCurrent = db->lookaside.nOut; |
| *pHighwater = db->lookaside.mxOut; |
| if( resetFlag ){ |
| db->lookaside.mxOut = db->lookaside.nOut; |
| } |
| break; |
| } |
| |
| case SQLITE_DBSTATUS_LOOKASIDE_HIT: |
| case SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE: |
| case SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL: { |
| testcase( op==SQLITE_DBSTATUS_LOOKASIDE_HIT ); |
| testcase( op==SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE ); |
| testcase( op==SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL ); |
| assert( (op-SQLITE_DBSTATUS_LOOKASIDE_HIT)>=0 ); |
| assert( (op-SQLITE_DBSTATUS_LOOKASIDE_HIT)<3 ); |
| *pCurrent = 0; |
| *pHighwater = db->lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT]; |
| if( resetFlag ){ |
| 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: { |
| 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); |
| } |
| } |
| sqlite3BtreeLeaveAll(db); |
| *pCurrent = totalUsed; |
| *pHighwater = 0; |
| break; |
| } |
| |
| /* |
| ** *pCurrent gets an accurate estimate of the amount of memory used |
| ** to store the schema for all databases (main, temp, and any ATTACHed |
| ** databases. *pHighwater is set to zero. |
| */ |
| case SQLITE_DBSTATUS_SCHEMA_USED: { |
| int i; /* Used to iterate through schemas */ |
| int nByte = 0; /* Used to accumulate return value */ |
| |
| sqlite3BtreeEnterAll(db); |
| db->pnBytesFreed = &nByte; |
| for(i=0; i<db->nDb; i++){ |
| Schema *pSchema = db->aDb[i].pSchema; |
| if( ALWAYS(pSchema!=0) ){ |
| HashElem *p; |
| |
| nByte += sqlite3GlobalConfig.m.xRoundup(sizeof(HashElem)) * ( |
| pSchema->tblHash.count |
| + pSchema->trigHash.count |
| + pSchema->idxHash.count |
| + pSchema->fkeyHash.count |
| ); |
| nByte += sqlite3MallocSize(pSchema->tblHash.ht); |
| nByte += sqlite3MallocSize(pSchema->trigHash.ht); |
| nByte += sqlite3MallocSize(pSchema->idxHash.ht); |
| nByte += sqlite3MallocSize(pSchema->fkeyHash.ht); |
| |
| for(p=sqliteHashFirst(&pSchema->trigHash); p; p=sqliteHashNext(p)){ |
| sqlite3DeleteTrigger(db, (Trigger*)sqliteHashData(p)); |
| } |
| for(p=sqliteHashFirst(&pSchema->tblHash); p; p=sqliteHashNext(p)){ |
| sqlite3DeleteTable(db, (Table *)sqliteHashData(p)); |
| } |
| } |
| } |
| db->pnBytesFreed = 0; |
| sqlite3BtreeLeaveAll(db); |
| |
| *pHighwater = 0; |
| *pCurrent = nByte; |
| break; |
| } |
| |
| /* |
| ** *pCurrent gets an accurate estimate of the amount of memory used |
| ** to store all prepared statements. |
| ** *pHighwater is set to zero. |
| */ |
| case SQLITE_DBSTATUS_STMT_USED: { |
| struct Vdbe *pVdbe; /* Used to iterate through VMs */ |
| int nByte = 0; /* Used to accumulate return value */ |
| |
| db->pnBytesFreed = &nByte; |
| for(pVdbe=db->pVdbe; pVdbe; pVdbe=pVdbe->pNext){ |
| sqlite3VdbeDeleteObject(db, pVdbe); |
| } |
| db->pnBytesFreed = 0; |
| |
| *pHighwater = 0; |
| *pCurrent = nByte; |
| |
| break; |
| } |
| |
| default: { |
| rc = SQLITE_ERROR; |
| } |
| } |
| sqlite3_mutex_leave(db->mutex); |
| return rc; |
| } |