mirror of
https://gitlab.com/cznic/sqlite.git
synced 2024-11-24 02:26:14 +00:00
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
|
|
** 2014 December 9
|
|
**
|
|
** 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.
|
|
**
|
|
*************************************************************************
|
|
**
|
|
** lookaside1
|
|
*/
|
|
|
|
/*
|
|
** The test in this file attempts to expose a specific race condition
|
|
** that is suspected to exist at time of writing.
|
|
*/
|
|
|
|
static char *lookaside1_thread_reader(int iTid, void *pArg){
|
|
Error err = {0}; /* Error code and message */
|
|
Sqlite db = {0}; /* SQLite database connection */
|
|
|
|
opendb(&err, &db, "test.db", 0);
|
|
|
|
while( !timetostop(&err) ){
|
|
sqlite3_stmt *pStmt = 0;
|
|
int rc;
|
|
|
|
sqlite3_prepare_v2(db.db, "SELECT 1 FROM t1", -1, &pStmt, 0);
|
|
while( sqlite3_step(pStmt)==SQLITE_ROW ){
|
|
execsql(&err, &db, "SELECT length(x||y||z) FROM t2");
|
|
}
|
|
rc = sqlite3_finalize(pStmt);
|
|
if( err.rc==SQLITE_OK && rc!=SQLITE_OK ){
|
|
sqlite_error(&err, &db, "finalize");
|
|
}
|
|
}
|
|
|
|
closedb(&err, &db);
|
|
print_and_free_err(&err);
|
|
return sqlite3_mprintf("ok");
|
|
}
|
|
|
|
static char *lookaside1_thread_writer(int iTid, void *pArg){
|
|
Error err = {0}; /* Error code and message */
|
|
Sqlite db = {0}; /* SQLite database connection */
|
|
|
|
opendb(&err, &db, "test.db", 0);
|
|
|
|
do{
|
|
sql_script(&err, &db,
|
|
"BEGIN;"
|
|
"UPDATE t3 SET i=i+1 WHERE x=1;"
|
|
"ROLLBACK;"
|
|
);
|
|
}while( !timetostop(&err) );
|
|
|
|
closedb(&err, &db);
|
|
print_and_free_err(&err);
|
|
return sqlite3_mprintf("ok");
|
|
}
|
|
|
|
|
|
static void lookaside1(int nMs){
|
|
Error err = {0};
|
|
Sqlite db = {0};
|
|
Threadset threads = {0};
|
|
|
|
opendb(&err, &db, "test.db", 1);
|
|
sql_script(&err, &db,
|
|
"CREATE TABLE t1(x PRIMARY KEY) WITHOUT ROWID;"
|
|
"WITH data(x,y) AS ("
|
|
" SELECT 1, quote(randomblob(750)) UNION ALL "
|
|
" SELECT x*2, y||y FROM data WHERE x<5) "
|
|
"INSERT INTO t1 SELECT y FROM data;"
|
|
|
|
"CREATE TABLE t3(x PRIMARY KEY,i) WITHOUT ROWID;"
|
|
"INSERT INTO t3 VALUES(1, 1);"
|
|
|
|
"CREATE TABLE t2(x,y,z);"
|
|
"INSERT INTO t2 VALUES(randomblob(50), randomblob(50), randomblob(50));"
|
|
);
|
|
closedb(&err, &db);
|
|
|
|
setstoptime(&err, nMs);
|
|
|
|
sqlite3_enable_shared_cache(1);
|
|
launch_thread(&err, &threads, lookaside1_thread_reader, 0);
|
|
launch_thread(&err, &threads, lookaside1_thread_reader, 0);
|
|
launch_thread(&err, &threads, lookaside1_thread_reader, 0);
|
|
launch_thread(&err, &threads, lookaside1_thread_reader, 0);
|
|
launch_thread(&err, &threads, lookaside1_thread_reader, 0);
|
|
launch_thread(&err, &threads, lookaside1_thread_writer, 0);
|
|
join_all_threads(&err, &threads);
|
|
sqlite3_enable_shared_cache(0);
|
|
print_and_free_err(&err);
|
|
}
|