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Experimental changes to put sqlite3_temp_directory behind a mutex.

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FossilOrigin-Name: 5ee3515fbb88bf1ae5f8b507844f82dcc429380b6ebeab9b09b52b25ee60a60d
This commit is contained in:
drh
2022-09-02 00:36:16 +00:00
parent 44132244fa
commit 18a3a48db1
6 changed files with 75 additions and 25 deletions
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31
src/os_unix.c
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@@ -5855,6 +5855,7 @@ static const char *unixTempFileDir(void){
static int unixGetTempname(int nBuf, char *zBuf){
const char *zDir;
int iLimit = 0;
int rc = SQLITE_OK;
/* It's odd to simulate an io-error here, but really this is just
** using the io-error infrastructure to test that SQLite handles this
@@ -5863,18 +5864,26 @@ static int unixGetTempname(int nBuf, char *zBuf){
zBuf[0] = 0;
SimulateIOError( return SQLITE_IOERR );
sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_TEMPDIR));
zDir = unixTempFileDir();
if( zDir==0 ) return SQLITE_IOERR_GETTEMPPATH;
do{
u64 r;
sqlite3_randomness(sizeof(r), &r);
assert( nBuf>2 );
zBuf[nBuf-2] = 0;
sqlite3_snprintf(nBuf, zBuf, "%s/"SQLITE_TEMP_FILE_PREFIX"%llx%c",
zDir, r, 0);
if( zBuf[nBuf-2]!=0 || (iLimit++)>10 ) return SQLITE_ERROR;
}while( osAccess(zBuf,0)==0 );
return SQLITE_OK;
if( zDir==0 ){
rc = SQLITE_IOERR_GETTEMPPATH;
}else{
do{
u64 r;
sqlite3_randomness(sizeof(r), &r);
assert( nBuf>2 );
zBuf[nBuf-2] = 0;
sqlite3_snprintf(nBuf, zBuf, "%s/"SQLITE_TEMP_FILE_PREFIX"%llx%c",
zDir, r, 0);
if( zBuf[nBuf-2]!=0 || (iLimit++)>10 ){
rc = SQLITE_ERROR;
break;
}
}while( osAccess(zBuf,0)==0 );
}
sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_TEMPDIR));
return rc;
}
#if SQLITE_ENABLE_LOCKING_STYLE && defined(__APPLE__)