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100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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** 2014 December 9
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** lookaside1
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*/
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/*
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** The test in this file attempts to expose a specific race condition
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** that is suspected to exist at time of writing.
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*/
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static char *lookaside1_thread_reader(int iTid, void *pArg){
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Error err = {0}; /* Error code and message */
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Sqlite db = {0}; /* SQLite database connection */
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opendb(&err, &db, "test.db", 0);
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while( !timetostop(&err) ){
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sqlite3_stmt *pStmt = 0;
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int rc;
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sqlite3_prepare_v2(db.db, "SELECT 1 FROM t1", -1, &pStmt, 0);
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while( sqlite3_step(pStmt)==SQLITE_ROW ){
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execsql(&err, &db, "SELECT length(x||y||z) FROM t2");
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}
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rc = sqlite3_finalize(pStmt);
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if( err.rc==SQLITE_OK && rc!=SQLITE_OK ){
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sqlite_error(&err, &db, "finalize");
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}
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}
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closedb(&err, &db);
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print_and_free_err(&err);
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return sqlite3_mprintf("ok");
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}
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static char *lookaside1_thread_writer(int iTid, void *pArg){
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Error err = {0}; /* Error code and message */
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Sqlite db = {0}; /* SQLite database connection */
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opendb(&err, &db, "test.db", 0);
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do{
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sql_script(&err, &db,
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"BEGIN;"
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"UPDATE t3 SET i=i+1 WHERE x=1;"
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"ROLLBACK;"
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);
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}while( !timetostop(&err) );
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closedb(&err, &db);
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print_and_free_err(&err);
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return sqlite3_mprintf("ok");
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}
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static void lookaside1(int nMs){
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Error err = {0};
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Sqlite db = {0};
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Threadset threads = {0};
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opendb(&err, &db, "test.db", 1);
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sql_script(&err, &db,
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"CREATE TABLE t1(x PRIMARY KEY) WITHOUT ROWID;"
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"WITH data(x,y) AS ("
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" SELECT 1, quote(randomblob(750)) UNION ALL "
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" SELECT x*2, y||y FROM data WHERE x<5) "
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"INSERT INTO t1 SELECT y FROM data;"
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"CREATE TABLE t3(x PRIMARY KEY,i) WITHOUT ROWID;"
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"INSERT INTO t3 VALUES(1, 1);"
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"CREATE TABLE t2(x,y,z);"
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"INSERT INTO t2 VALUES(randomblob(50), randomblob(50), randomblob(50));"
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);
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closedb(&err, &db);
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setstoptime(&err, nMs);
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sqlite3_enable_shared_cache(1);
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launch_thread(&err, &threads, lookaside1_thread_reader, 0);
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launch_thread(&err, &threads, lookaside1_thread_reader, 0);
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launch_thread(&err, &threads, lookaside1_thread_reader, 0);
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launch_thread(&err, &threads, lookaside1_thread_reader, 0);
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launch_thread(&err, &threads, lookaside1_thread_reader, 0);
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launch_thread(&err, &threads, lookaside1_thread_writer, 0);
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join_all_threads(&err, &threads);
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sqlite3_enable_shared_cache(0);
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print_and_free_err(&err);
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}
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