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Overview
| Comment: | Fix a race condition in the sorter. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | threads |
| Files: | files | file ages | folders |
| SHA1: |
32ccf3ae18531682dfd039fa8df6ad9a |
| User & Date: | dan 2014-05-03 19:33:00 |
Context
|
2014-05-03
| ||
| 20:43 | Add an extra fault-injection test to sortfault.test. Remove an unreachable branch from vdbesort.c. check-in: a33a366b user: dan tags: threads | |
| 19:33 | Fix a race condition in the sorter. check-in: 32ccf3ae user: dan tags: threads | |
| 14:28 | Fix a problem in the sorter causing it to return spurious SQLITE_NOMEM errors when configured to use memsys3 or memsys5. check-in: 3a66c4e1 user: dan tags: threads | |
Changes
Changes to src/vdbesort.c.
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/*
** Advance iterator pIter to the next key in its PMA. Return SQLITE_OK if
** no error occurs, or an SQLite error code if one does.
*/
static int vdbePmaReaderNext(PmaReader *pIter){
int rc = SQLITE_OK; /* Return Code */
u64 nRec = 0; /* Size of record in bytes */
if( pIter->iReadOff>=pIter->iEof ){
IncrMerger *pIncr = pIter->pIncr;
int bEof = 1;
if( pIncr ){
rc = vdbeIncrSwap(pIncr);
if( rc==SQLITE_OK && pIncr->bEof==0 ){
................................................................................
static int vdbeIncrInitMerger(
SortSubtask *pTask,
MergeEngine *pMerger,
int eMode /* One of the INCRINIT_XXX constants */
){
int rc = SQLITE_OK; /* Return code */
int i; /* For iterating through PmaReader objects */
for(i=0; rc==SQLITE_OK && i<pMerger->nTree; i++){
if( eMode==INCRINIT_ROOT ){
rc = vdbePmaReaderNext(&pMerger->aIter[i]);
}else{
rc = vdbePmaReaderIncrInit(&pMerger->aIter[i], INCRINIT_NORMAL);
}
}
for(i=pMerger->nTree-1; rc==SQLITE_OK && i>0; i--){
rc = vdbeSorterDoCompare(pTask, pMerger, i);
................................................................................
assert( pIncr->pTask!=pLast );
}
}
if( pSorter->nTask>1 ){
for(iTask=0; rc==SQLITE_OK && iTask<pSorter->nTask; iTask++){
PmaReader *p = &pMain->aIter[iTask];
assert( p->pIncr==0 || p->pIncr->pTask==&pSorter->aTask[iTask] );
if( p->pIncr ){ rc = vdbePmaReaderBgIncrInit(p); }
}
}
}
pMain = 0;
}
if( rc==SQLITE_OK ){
int eMode = (pSorter->nTask>1 ? INCRINIT_ROOT : INCRINIT_NORMAL);
|
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/*
** Advance iterator pIter to the next key in its PMA. Return SQLITE_OK if
** no error occurs, or an SQLite error code if one does.
*/
static int vdbePmaReaderNext(PmaReader *pIter){
int rc = SQLITE_OK; /* Return Code */
u64 nRec = 0; /* Size of record in bytes */
if( pIter->iReadOff>=pIter->iEof ){
IncrMerger *pIncr = pIter->pIncr;
int bEof = 1;
if( pIncr ){
rc = vdbeIncrSwap(pIncr);
if( rc==SQLITE_OK && pIncr->bEof==0 ){
................................................................................
static int vdbeIncrInitMerger(
SortSubtask *pTask,
MergeEngine *pMerger,
int eMode /* One of the INCRINIT_XXX constants */
){
int rc = SQLITE_OK; /* Return code */
int i; /* For iterating through PmaReader objects */
int nTree = pMerger->nTree;
for(i=0; rc==SQLITE_OK && i<nTree; i++){
if( eMode==INCRINIT_ROOT ){
/* Iterators should be normally initialized in order, as if they are
** reading from the same temp file this makes for more linear file IO.
** However, in the INCRINIT_ROOT case, if iterator aIter[nTask-1] is
** in use it will block the vdbePmaReaderNext() call while it uses
** the main thread to fill its buffer. So calling PmaReaderNext()
** on this iterator before any of the multi-threaded iterators takes
** better advantage of multi-processor hardware. */
rc = vdbePmaReaderNext(&pMerger->aIter[nTree-i-1]);
}else{
rc = vdbePmaReaderIncrInit(&pMerger->aIter[i], INCRINIT_NORMAL);
}
}
for(i=pMerger->nTree-1; rc==SQLITE_OK && i>0; i--){
rc = vdbeSorterDoCompare(pTask, pMerger, i);
................................................................................
assert( pIncr->pTask!=pLast );
}
}
if( pSorter->nTask>1 ){
for(iTask=0; rc==SQLITE_OK && iTask<pSorter->nTask; iTask++){
PmaReader *p = &pMain->aIter[iTask];
assert( p->pIncr==0 || p->pIncr->pTask==&pSorter->aTask[iTask] );
if( p->pIncr ){
if( iTask==pSorter->nTask-1 ){
rc = vdbePmaReaderIncrInit(p, INCRINIT_TASK);
}else{
rc = vdbePmaReaderBgIncrInit(p);
}
}
}
}
}
pMain = 0;
}
if( rc==SQLITE_OK ){
int eMode = (pSorter->nTask>1 ? INCRINIT_ROOT : INCRINIT_NORMAL);
|
Changes to test/sort.test.
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1 0 3 file true false
2 0 3 file true true
3 0 0 file true false
4 1000000 3 file true false
5 0 0 memory false true
} {
db close
sqlite3_shutdown
sqlite3_config_worker_threads $nWorker
if {$coremutex} {
sqlite3_config multithread
} else {
sqlite3_config singlethread
}
sqlite3_initialize
sorter_test_fakeheap $fakeheap
reset_db
sqlite3_test_control SQLITE_TESTCTRL_SORTER_MMAP db $mmap_limit
execsql "PRAGMA temp_store = $tmpstore"
set ten [string repeat X 10300]
................................................................................
} [list 2 $one 4 $ten]
sorter_test_fakeheap 0
}
db close
sqlite3_shutdown
#sqlite3_config_worker_threads $sqlite_options(worker_threads)
sqlite3_config_worker_threads 0
set t(0) singlethread
set t(1) multithread
set t(2) serialized
sqlite3_config $t($sqlite_options(threadsafe))
sqlite3_initialize
finish_test
|
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<
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1 0 3 file true false
2 0 3 file true true
3 0 0 file true false
4 1000000 3 file true false
5 0 0 memory false true
} {
db close
sqlite3_shutdown
sqlite3_config_worker_threads $nWorker
if {$coremutex} {
sqlite3_config multithread
} else {
sqlite3_config singlethread
}
sqlite3_initialize
sorter_test_fakeheap $fakeheap
reset_db
sqlite3_test_control SQLITE_TESTCTRL_SORTER_MMAP db $mmap_limit
execsql "PRAGMA temp_store = $tmpstore"
set ten [string repeat X 10300]
................................................................................
} [list 2 $one 4 $ten]
sorter_test_fakeheap 0
}
db close
sqlite3_shutdown
sqlite3_config_worker_threads 0
set t(0) singlethread
set t(1) multithread
set t(2) serialized
sqlite3_config $t($sqlite_options(threadsafe))
sqlite3_initialize
finish_test
|
Changes to test/sortfault.test.
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 |
set testprefix sortfault
do_execsql_test 1.0 {
PRAGMA cache_size = 5;
}
foreach {tn mmap_limit} {
1 0
2 100000
} {
do_faultsim_test 1.$tn -prep {
sqlite3 db test.db
sqlite3_test_control SQLITE_TESTCTRL_SORTER_MMAP db $::mmap_limit
} -body {
execsql {
WITH r(x,y) AS (
SELECT 1, randomblob(1000)
UNION ALL
SELECT x+1, randomblob(1000) FROM r
LIMIT 500
)
SELECT count(x), length(y) FROM r GROUP BY (x%5)
}
} -test {
faultsim_test_result {0 {100 1000 100 1000 100 1000 100 1000 100 1000}}
}
}
finish_test
|
| | | > > > > > > > > > > | | | | | | | > > > > > > > > |
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set testprefix sortfault
do_execsql_test 1.0 {
PRAGMA cache_size = 5;
}
foreach {tn mmap_limit nWorker tmpstore threadsmode fakeheap} {
1 0 0 file multithread false
2 100000 0 file multithread false
} {
catch { db close }
sqlite3_shutdown
sqlite3_config_worker_threads $nWorker
sqlite3_config $threadsmode
sqlite3_initialize
sorter_test_fakeheap $fakeheap
set str [string repeat a 1000]
do_faultsim_test 1.$tn -prep {
sqlite3 db test.db
sqlite3_test_control SQLITE_TESTCTRL_SORTER_MMAP db $::mmap_limit
execsql { PRAGMA cache_size = 5 }
} -body {
execsql {
WITH r(x,y) AS (
SELECT 1, $::str
UNION ALL
SELECT x+1, $::str FROM r
LIMIT 200
)
SELECT count(x), length(y) FROM r GROUP BY (x%5)
}
} -test {
faultsim_test_result {0 {40 1000 40 1000 40 1000 40 1000 40 1000}}
}
}
catch { db close }
sqlite3_shutdown
sqlite3_config_worker_threads 0
set t(0) singlethread
set t(1) multithread
set t(2) serialized
sqlite3_config $t($sqlite_options(threadsafe))
sqlite3_initialize
finish_test
|