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380 lines (354 loc) · 11.9 KB
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/*
** 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.
*/
#if SQLITE_PTRSIZE>4
typedef sqlite3_int64 sqlite3StatValueType;
#else
typedef u32 sqlite3StatValueType;
#endif
typedef struct sqlite3StatType sqlite3StatType;
static SQLITE_WSD struct sqlite3StatType {
sqlite3StatValueType nowValue[10]; /* Current value */
sqlite3StatValueType mxValue[10]; /* Maximum value */
} sqlite3Stat = { {0,}, {0,} };
/*
** Elements of sqlite3Stat[] are protected by either the memory allocator
** mutex, or by the pcache1 mutex. The following array determines which.
*/
static const char statMutex[] = {
0, /* SQLITE_STATUS_MEMORY_USED */
1, /* SQLITE_STATUS_PAGECACHE_USED */
1, /* SQLITE_STATUS_PAGECACHE_OVERFLOW */
0, /* SQLITE_STATUS_SCRATCH_USED */
0, /* SQLITE_STATUS_SCRATCH_OVERFLOW */
0, /* SQLITE_STATUS_MALLOC_SIZE */
0, /* SQLITE_STATUS_PARSER_STACK */
1, /* SQLITE_STATUS_PAGECACHE_SIZE */
0, /* SQLITE_STATUS_SCRATCH_SIZE */
0, /* SQLITE_STATUS_MALLOC_COUNT */
};
/* 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. The caller must
** be holding the appropriate mutex.
*/
sqlite3_int64 sqlite3StatusValue(int op){
wsdStatInit;
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
assert( op>=0 && op<ArraySize(statMutex) );
assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
: sqlite3MallocMutex()) );
return wsdStat.nowValue[op];
}
/*
** Add N to the value of a status record. The caller must hold the
** appropriate mutex. (Locking is checked by assert()).
**
** The StatusUp() routine can accept positive or negative values for N.
** The value of N is added to the current status value and the high-water
** mark is adjusted if necessary.
**
** The StatusDown() routine lowers the current value by N. The highwater
** mark is unchanged. N must be non-negative for StatusDown().
*/
void sqlite3StatusUp(int op, int N){
wsdStatInit;
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
assert( op>=0 && op<ArraySize(statMutex) );
assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
: sqlite3MallocMutex()) );
wsdStat.nowValue[op] += N;
if( wsdStat.nowValue[op]>wsdStat.mxValue[op] ){
wsdStat.mxValue[op] = wsdStat.nowValue[op];
}
}
void sqlite3StatusDown(int op, int N){
wsdStatInit;
assert( N>=0 );
assert( op>=0 && op<ArraySize(statMutex) );
assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
: sqlite3MallocMutex()) );
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
wsdStat.nowValue[op] -= N;
}
/*
** Adjust the highwater mark if necessary.
** The caller must hold the appropriate mutex.
*/
void sqlite3StatusHighwater(int op, int X){
sqlite3StatValueType newValue;
wsdStatInit;
assert( X>=0 );
newValue = (sqlite3StatValueType)X;
assert( op>=0 && op<ArraySize(wsdStat.nowValue) );
assert( op>=0 && op<ArraySize(statMutex) );
assert( sqlite3_mutex_held(statMutex[op] ? sqlite3Pcache1Mutex()
: sqlite3MallocMutex()) );
assert( op==SQLITE_STATUS_MALLOC_SIZE
|| op==SQLITE_STATUS_PAGECACHE_SIZE
|| op==SQLITE_STATUS_PARSER_STACK );
if( newValue>wsdStat.mxValue[op] ){
wsdStat.mxValue[op] = newValue;
}
}
/*
** Query status information.
*/
int sqlite3_status64(
int op,
sqlite3_int64 *pCurrent,
sqlite3_int64 *pHighwater,
int resetFlag
){
sqlite3_mutex *pMutex;
wsdStatInit;
if( op<0 || op>=ArraySize(wsdStat.nowValue) ){
return SQLITE_MISUSE_BKPT;
}
#ifdef SQLITE_ENABLE_API_ARMOR
if( pCurrent==0 || pHighwater==0 ) return SQLITE_MISUSE_BKPT;
#endif
pMutex = statMutex[op] ? sqlite3Pcache1Mutex() : sqlite3MallocMutex();
sqlite3_mutex_enter(pMutex);
*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 = 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;
}
/*
** Return the number of LookasideSlot elements on the linked list
*/
static u32 countLookasideSlots(LookasideSlot *p){
u32 cnt = 0;
while( p ){
p = p->pNext;
cnt++;
}
return cnt;
}
/*
** Count the number of slots of lookaside memory that are outstanding
*/
int sqlite3LookasideUsed(sqlite3 *db, int *pHighwater){
u32 nInit = countLookasideSlots(db->lookaside.pInit);
u32 nFree = countLookasideSlots(db->lookaside.pFree);
if( pHighwater ) *pHighwater = db->lookaside.nSlot - nInit;
return db->lookaside.nSlot - (nInit+nFree);
}
/*
** 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 */
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) || pCurrent==0|| pHighwater==0 ){
return SQLITE_MISUSE_BKPT;
}
#endif
sqlite3_mutex_enter(db->mutex);
switch( op ){
case SQLITE_DBSTATUS_LOOKASIDE_USED: {
*pCurrent = sqlite3LookasideUsed(db, pHighwater);
if( resetFlag ){
LookasideSlot *p = db->lookaside.pFree;
if( p ){
while( p->pNext ) p = p->pNext;
p->pNext = db->lookaside.pInit;
db->lookaside.pInit = db->lookaside.pFree;
db->lookaside.pFree = 0;
}
}
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_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);
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
** 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 += sqlite3_msize(pSchema->tblHash.ht);
nByte += sqlite3_msize(pSchema->trigHash.ht);
nByte += sqlite3_msize(pSchema->idxHash.ht);
nByte += sqlite3_msize(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){
sqlite3VdbeClearObject(db, pVdbe);
sqlite3DbFree(db, pVdbe);
}
db->pnBytesFreed = 0;
*pHighwater = 0; /* IMP: R-64479-57858 */
*pCurrent = nByte;
break;
}
/*
** Set *pCurrent to the total cache hits or misses encountered by all
** pagers the database handle is connected to. *pHighwater is always set
** to zero.
*/
case SQLITE_DBSTATUS_CACHE_SPILL:
op = SQLITE_DBSTATUS_CACHE_WRITE+1;
/* Fall through into the next case */
case SQLITE_DBSTATUS_CACHE_HIT:
case SQLITE_DBSTATUS_CACHE_MISS:
case SQLITE_DBSTATUS_CACHE_WRITE:{
int i;
int nRet = 0;
assert( SQLITE_DBSTATUS_CACHE_MISS==SQLITE_DBSTATUS_CACHE_HIT+1 );
assert( SQLITE_DBSTATUS_CACHE_WRITE==SQLITE_DBSTATUS_CACHE_HIT+2 );
for(i=0; i<db->nDb; i++){
if( db->aDb[i].pBt ){
Pager *pPager = sqlite3BtreePager(db->aDb[i].pBt);
sqlite3PagerCacheStat(pPager, op, resetFlag, &nRet);
}
}
*pHighwater = 0; /* IMP: R-42420-56072 */
/* IMP: R-54100-20147 */
/* IMP: R-29431-39229 */
*pCurrent = nRet;
break;
}
/* Set *pCurrent to non-zero if there are unresolved deferred foreign
** key constraints. Set *pCurrent to zero if all foreign key constraints
** have been satisfied. The *pHighwater is always set to zero.
*/
case SQLITE_DBSTATUS_DEFERRED_FKS: {
*pHighwater = 0; /* IMP: R-11967-56545 */
*pCurrent = db->nDeferredImmCons>0 || db->nDeferredCons>0;
break;
}
default: {
rc = SQLITE_ERROR;
}
}
sqlite3_mutex_leave(db->mutex);
return rc;
}