352 lines
11 KiB
C
352 lines
11 KiB
C
/*
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** 2008 June 18
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** This module implements the sqlite3_status() interface and related
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** functionality.
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*/
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#include "sqliteInt.h"
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#include "vdbeInt.h"
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/*
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** Variables in which to record status information.
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*/
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#if SQLITE_PTRSIZE>4
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typedef sqlite3_int64 sqlite3StatValueType;
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#else
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typedef u32 sqlite3StatValueType;
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#endif
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typedef struct sqlite3StatType sqlite3StatType;
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static SQLITE_WSD struct sqlite3StatType {
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sqlite3StatValueType nowValue[10]; /* Current value */
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sqlite3StatValueType mxValue[10]; /* Maximum value */
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} sqlite3Stat = { {0,}, {0,} };
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/*
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** Elements of sqlite3Stat[] are protected by either the memory allocator
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** mutex, or by the pcache1 mutex. The following array determines which.
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*/
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static const char statMutex[] = {
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0, /* SQLITE_STATUS_MEMORY_USED */
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1, /* SQLITE_STATUS_PAGECACHE_USED */
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1, /* SQLITE_STATUS_PAGECACHE_OVERFLOW */
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0, /* SQLITE_STATUS_SCRATCH_USED */
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0, /* SQLITE_STATUS_SCRATCH_OVERFLOW */
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0, /* SQLITE_STATUS_MALLOC_SIZE */
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0, /* SQLITE_STATUS_PARSER_STACK */
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1, /* SQLITE_STATUS_PAGECACHE_SIZE */
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0, /* SQLITE_STATUS_SCRATCH_SIZE */
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0, /* SQLITE_STATUS_MALLOC_COUNT */
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};
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/* The "wsdStat" macro will resolve to the status information
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** state vector. If writable static data is unsupported on the target,
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** we have to locate the state vector at run-time. In the more common
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** case where writable static data is supported, wsdStat can refer directly
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** to the "sqlite3Stat" state vector declared above.
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*/
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#ifdef SQLITE_OMIT_WSD
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# define wsdStatInit sqlite3StatType *x = &GLOBAL(sqlite3StatType,sqlite3Stat)
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# define wsdStat x[0]
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#else
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# define wsdStatInit
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# define wsdStat sqlite3Stat
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#endif
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/*
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** Return the current value of a status parameter. The caller must
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** be holding the appropriate mutex.
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*/
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sqlite3_int64 sqlite3StatusValue(int op){
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wsdStatInit;
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assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
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assert( op>=0 && op<ArraySize(statMutex) );
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assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
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: sqlite3MallocMutex()) );
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return wsdStat.nowValue[op];
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}
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/*
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** Add N to the value of a status record. The caller must hold the
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** appropriate mutex. (Locking is checked by assert()).
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**
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** The StatusUp() routine can accept positive or negative values for N.
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** The value of N is added to the current status value and the high-water
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** mark is adjusted if necessary.
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**
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** The StatusDown() routine lowers the current value by N. The highwater
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** mark is unchanged. N must be non-negative for StatusDown().
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*/
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void sqlite3StatusUp(int op, int N){
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wsdStatInit;
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assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
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assert( op>=0 && op<ArraySize(statMutex) );
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assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
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: sqlite3MallocMutex()) );
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wsdStat.nowValue[op] += N;
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if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){
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wsdStat.mxValue[op] = wsdStat.nowValue[op];
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}
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}
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void sqlite3StatusDown(int op, int N){
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wsdStatInit;
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assert( N>=0 );
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assert( op>=0 && op<ArraySize(statMutex) );
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assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
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: sqlite3MallocMutex()) );
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assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
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wsdStat.nowValue[op] -= N;
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}
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/*
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** Adjust the highwater mark if necessary.
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** The caller must hold the appropriate mutex.
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*/
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void sqlite3StatusHighwater(int op, int X){
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sqlite3StatValueType newValue;
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wsdStatInit;
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assert( X>=0 );
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newValue = (sqlite3StatValueType)X;
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assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
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assert( op>=0 && op<ArraySize(statMutex) );
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assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
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: sqlite3MallocMutex()) );
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assert( op==SQLITE_STATUS_MALLOC_SIZE
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|| op==SQLITE_STATUS_PAGECACHE_SIZE
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|| op==SQLITE_STATUS_SCRATCH_SIZE
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|| op==SQLITE_STATUS_PARSER_STACK );
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if( newValue>wsdStat.mxValue[op] ){
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wsdStat.mxValue[op] = newValue;
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}
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}
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/*
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** Query status information.
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*/
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int sqlite3_status64(
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int op,
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sqlite3_int64 *pCurrent,
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sqlite3_int64 *pHighwater,
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int resetFlag
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){
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sqlite3_mutex *pMutex;
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wsdStatInit;
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if( op<0 || op>=ArraySize(wsdStat.nowValue) ){
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return SQLITE_MISUSE_BKPT;
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}
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#ifdef SQLITE_ENABLE_API_ARMOR
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if( pCurrent==0 || pHighwater==0 ) return SQLITE_MISUSE_BKPT;
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#endif
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pMutex = statMutex[op] ? sqlite3Pcache1Mutex() : sqlite3MallocMutex();
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sqlite3_mutex_enter(pMutex);
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*pCurrent = wsdStat.nowValue[op];
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*pHighwater = wsdStat.mxValue[op];
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if( resetFlag ){
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wsdStat.mxValue[op] = wsdStat.nowValue[op];
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}
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sqlite3_mutex_leave(pMutex);
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(void)pMutex; /* Prevent warning when SQLITE_THREADSAFE=0 */
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return SQLITE_OK;
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}
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int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag){
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sqlite3_int64 iCur = 0, iHwtr = 0;
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int rc;
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#ifdef SQLITE_ENABLE_API_ARMOR
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if( pCurrent==0 || pHighwater==0 ) return SQLITE_MISUSE_BKPT;
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#endif
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rc = sqlite3_status64(op, &iCur, &iHwtr, resetFlag);
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if( rc==0 ){
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*pCurrent = (int)iCur;
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*pHighwater = (int)iHwtr;
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}
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return rc;
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}
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/*
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** Query status information for a single database connection
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*/
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int sqlite3_db_status(
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sqlite3 *db, /* The database connection whose status is desired */
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int op, /* Status verb */
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int *pCurrent, /* Write current value here */
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int *pHighwater, /* Write high-water mark here */
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int resetFlag /* Reset high-water mark if true */
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){
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int rc = SQLITE_OK; /* Return code */
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#ifdef SQLITE_ENABLE_API_ARMOR
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if( !sqlite3SafetyCheckOk(db) || pCurrent==0|| pHighwater==0 ){
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return SQLITE_MISUSE_BKPT;
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}
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#endif
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sqlite3_mutex_enter(db->mutex);
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switch( op ){
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case SQLITE_DBSTATUS_LOOKASIDE_USED: {
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*pCurrent = db->lookaside.nOut;
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*pHighwater = db->lookaside.mxOut;
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if( resetFlag ){
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db->lookaside.mxOut = db->lookaside.nOut;
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}
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break;
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}
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case SQLITE_DBSTATUS_LOOKASIDE_HIT:
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case SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE:
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case SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL: {
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testcase( op==SQLITE_DBSTATUS_LOOKASIDE_HIT );
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testcase( op==SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE );
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testcase( op==SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL );
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assert( (op-SQLITE_DBSTATUS_LOOKASIDE_HIT)>=0 );
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assert( (op-SQLITE_DBSTATUS_LOOKASIDE_HIT)<3 );
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*pCurrent = 0;
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*pHighwater = db->lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT];
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if( resetFlag ){
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db->lookaside.anStat[op - SQLITE_DBSTATUS_LOOKASIDE_HIT] = 0;
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}
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break;
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}
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/*
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** Return an approximation for the amount of memory currently used
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** by all pagers associated with the given database connection. The
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** highwater mark is meaningless and is returned as zero.
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*/
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case SQLITE_DBSTATUS_CACHE_USED_SHARED:
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case SQLITE_DBSTATUS_CACHE_USED: {
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int totalUsed = 0;
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int i;
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sqlite3BtreeEnterAll(db);
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for(i=0; i<db->nDb; i++){
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Btree *pBt = db->aDb[i].pBt;
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if( pBt ){
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Pager *pPager = sqlite3BtreePager(pBt);
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int nByte = sqlite3PagerMemUsed(pPager);
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if( op==SQLITE_DBSTATUS_CACHE_USED_SHARED ){
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nByte = nByte / sqlite3BtreeConnectionCount(pBt);
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}
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totalUsed += nByte;
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}
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}
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sqlite3BtreeLeaveAll(db);
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*pCurrent = totalUsed;
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*pHighwater = 0;
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break;
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}
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/*
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** *pCurrent gets an accurate estimate of the amount of memory used
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** to store the schema for all databases (main, temp, and any ATTACHed
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** databases. *pHighwater is set to zero.
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*/
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case SQLITE_DBSTATUS_SCHEMA_USED: {
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int i; /* Used to iterate through schemas */
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int nByte = 0; /* Used to accumulate return value */
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sqlite3BtreeEnterAll(db);
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db->pnBytesFreed = &nByte;
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for(i=0; i<db->nDb; i++){
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Schema *pSchema = db->aDb[i].pSchema;
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if( ALWAYS(pSchema!=0) ){
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HashElem *p;
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nByte += sqlite3GlobalConfig.m.xRoundup(sizeof(HashElem)) * (
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pSchema->tblHash.count
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+ pSchema->trigHash.count
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+ pSchema->idxHash.count
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+ pSchema->fkeyHash.count
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);
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nByte += sqlite3_msize(pSchema->tblHash.ht);
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nByte += sqlite3_msize(pSchema->trigHash.ht);
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nByte += sqlite3_msize(pSchema->idxHash.ht);
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nByte += sqlite3_msize(pSchema->fkeyHash.ht);
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for(p=sqliteHashFirst(&pSchema->trigHash); p; p=sqliteHashNext(p)){
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sqlite3DeleteTrigger(db, (Trigger*)sqliteHashData(p));
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}
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for(p=sqliteHashFirst(&pSchema->tblHash); p; p=sqliteHashNext(p)){
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sqlite3DeleteTable(db, (Table *)sqliteHashData(p));
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}
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}
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}
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db->pnBytesFreed = 0;
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sqlite3BtreeLeaveAll(db);
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*pHighwater = 0;
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*pCurrent = nByte;
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break;
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}
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/*
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** *pCurrent gets an accurate estimate of the amount of memory used
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** to store all prepared statements.
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** *pHighwater is set to zero.
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*/
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case SQLITE_DBSTATUS_STMT_USED: {
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struct Vdbe *pVdbe; /* Used to iterate through VMs */
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int nByte = 0; /* Used to accumulate return value */
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db->pnBytesFreed = &nByte;
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for(pVdbe=db->pVdbe; pVdbe; pVdbe=pVdbe->pNext){
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sqlite3VdbeClearObject(db, pVdbe);
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sqlite3DbFree(db, pVdbe);
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}
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db->pnBytesFreed = 0;
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*pHighwater = 0; /* IMP: R-64479-57858 */
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*pCurrent = nByte;
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break;
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}
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/*
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** Set *pCurrent to the total cache hits or misses encountered by all
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** pagers the database handle is connected to. *pHighwater is always set
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** to zero.
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*/
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case SQLITE_DBSTATUS_CACHE_HIT:
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case SQLITE_DBSTATUS_CACHE_MISS:
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case SQLITE_DBSTATUS_CACHE_WRITE:{
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int i;
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int nRet = 0;
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assert( SQLITE_DBSTATUS_CACHE_MISS==SQLITE_DBSTATUS_CACHE_HIT+1 );
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assert( SQLITE_DBSTATUS_CACHE_WRITE==SQLITE_DBSTATUS_CACHE_HIT+2 );
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for(i=0; i<db->nDb; i++){
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if( db->aDb[i].pBt ){
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Pager *pPager = sqlite3BtreePager(db->aDb[i].pBt);
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sqlite3PagerCacheStat(pPager, op, resetFlag, &nRet);
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}
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}
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*pHighwater = 0; /* IMP: R-42420-56072 */
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/* IMP: R-54100-20147 */
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/* IMP: R-29431-39229 */
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*pCurrent = nRet;
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break;
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}
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/* Set *pCurrent to non-zero if there are unresolved deferred foreign
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** key constraints. Set *pCurrent to zero if all foreign key constraints
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** have been satisfied. The *pHighwater is always set to zero.
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*/
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case SQLITE_DBSTATUS_DEFERRED_FKS: {
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*pHighwater = 0; /* IMP: R-11967-56545 */
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*pCurrent = db->nDeferredImmCons>0 || db->nDeferredCons>0;
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break;
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}
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default: {
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rc = SQLITE_ERROR;
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}
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}
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sqlite3_mutex_leave(db->mutex);
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return rc;
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}
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