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Overview
| Comment: | Fix a race condition in the sorter code. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | threads |
| Files: | files | file ages | folders |
| SHA1: | 2d2edfe58db101d42a96772b856e6e55 |
| User & Date: | dan 2014-05-05 15:58:40 |
Context
|
2014-05-05
| ||
| 20:03 | Add test file sort4.test, containing brute force tests for the multi-theaded sorter. check-in: 9cc364c4 user: dan tags: threads | |
| 15:58 | Fix a race condition in the sorter code. check-in: 2d2edfe5 user: dan tags: threads | |
| 09:08 | Add tests so that the "coverage-sorter" test permutation covers all branches in vdbesort.c. Fix a few minor problems in the same file. check-in: bde28b70 user: dan tags: threads | |
Changes
Changes to src/vdbesort.c.
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/*
** Join all outstanding threads launched by SorterWrite() to create
** level-0 PMAs.
*/
static int vdbeSorterJoinAll(VdbeSorter *pSorter, int rcin){
int rc = rcin;
int i;
for(i=0; i<pSorter->nTask; i++){
SortSubtask *pTask = &pSorter->aTask[i];
int rc2 = vdbeSorterJoinThread(pTask);
if( rc==SQLITE_OK ) rc = rc2;
}
return rc;
}
#else
|
> > > > > > > > | |
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/*
** Join all outstanding threads launched by SorterWrite() to create
** level-0 PMAs.
*/
static int vdbeSorterJoinAll(VdbeSorter *pSorter, int rcin){
int rc = rcin;
int i;
/* This function is always called by the main user thread.
**
** If this function is being called after SorterRewind() has been called,
** it is possible that thread pSorter->aTask[pSorter->nTask-1].pThread
** is currently attempt to join one of the other threads. To avoid a race
** condition where this thread also attempts to join the same object, join
** thread pSorter->aTask[pSorter->nTask-1].pThread first. */
for(i=pSorter->nTask-1; i>=0; i--){
SortSubtask *pTask = &pSorter->aTask[i];
int rc2 = vdbeSorterJoinThread(pTask);
if( rc==SQLITE_OK ) rc = rc2;
}
return rc;
}
#else
|