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/*
** 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.
**
*************************************************************************
**
**
*/
/*
** Thread 1. CREATE and DROP a table.
*/
static char *stress_thread_1(int iTid, int iArg){
Error err = {0}; /* Error code and message */
Sqlite db = {0}; /* SQLite database connection */
opendb(&err, &db, "test.db", 0);
while( !timetostop(&err) ){
sql_script(&err, &db, "CREATE TABLE IF NOT EXISTS t1(a PRIMARY KEY, b)");
clear_error(&err, SQLITE_LOCKED);
sql_script(&err, &db, "DROP TABLE IF EXISTS t1");
clear_error(&err, SQLITE_LOCKED);
}
closedb(&err, &db);
print_and_free_err(&err);
return sqlite3_mprintf("ok");
}
/*
** Thread 2. Open and close database connections.
*/
static char *stress_thread_2(int iTid, int iArg){
Error err = {0}; /* Error code and message */
Sqlite db = {0}; /* SQLite database connection */
while( !timetostop(&err) ){
opendb(&err, &db, "test.db", 0);
sql_script(&err, &db, "SELECT * FROM sqlite_master;");
clear_error(&err, SQLITE_LOCKED);
closedb(&err, &db);
}
print_and_free_err(&err);
return sqlite3_mprintf("ok");
}
/*
** Thread 3. Attempt many small SELECT statements.
*/
static char *stress_thread_3(int iTid, int iArg){
Error err = {0}; /* Error code and message */
Sqlite db = {0}; /* SQLite database connection */
int i1 = 0;
int i2 = 0;
opendb(&err, &db, "test.db", 0);
while( !timetostop(&err) ){
sql_script(&err, &db, "SELECT * FROM t1 ORDER BY a;");
i1++;
if( err.rc ) i2++;
clear_error(&err, SQLITE_LOCKED);
clear_error(&err, SQLITE_ERROR);
}
closedb(&err, &db);
print_and_free_err(&err);
return sqlite3_mprintf("read t1 %d/%d attempts", i2, i1);
}
/*
** Thread 5. Attempt INSERT statements.
*/
static char *stress_thread_4(int iTid, int iArg){
Error err = {0}; /* Error code and message */
Sqlite db = {0}; /* SQLite database connection */
int i1 = 0;
int i2 = 0;
opendb(&err, &db, "test.db", 0);
while( !timetostop(&err) ){
if( iArg ){
closedb(&err, &db);
opendb(&err, &db, "test.db", 0);
}
sql_script(&err, &db,
"WITH loop(i) AS (SELECT 1 UNION ALL SELECT i+1 FROM loop LIMIT 200) "
"INSERT INTO t1 VALUES(randomblob(60), randomblob(60));"
);
i1++;
if( err.rc ) i2++;
clear_error(&err, SQLITE_LOCKED);
clear_error(&err, SQLITE_ERROR);
}
closedb(&err, &db);
print_and_free_err(&err);
return sqlite3_mprintf("wrote t1 %d/%d attempts", i2, i1);
}
/*
** Thread 6. Attempt DELETE operations.
*/
static char *stress_thread_5(int iTid, int iArg){
Error err = {0}; /* Error code and message */
Sqlite db = {0}; /* SQLite database connection */
int i1 = 0;
int i2 = 0;
opendb(&err, &db, "test.db", 0);
while( !timetostop(&err) ){
i64 i = (i1 % 4);
if( iArg ){
closedb(&err, &db);
opendb(&err, &db, "test.db", 0);
}
execsql(&err, &db, "DELETE FROM t1 WHERE (rowid % 4)==:i", &i);
i1++;
if( err.rc ) i2++;
clear_error(&err, SQLITE_LOCKED);
clear_error(&err, SQLITE_ERROR);
}
closedb(&err, &db);
print_and_free_err(&err);
return sqlite3_mprintf("deleted from t1 %d/%d attempts", i2, i1);
}
static void stress1(int nMs){
Error err = {0};
Sqlite db = {0};
Threadset threads = {0};
setstoptime(&err, nMs);
sqlite3_enable_shared_cache(1);
launch_thread(&err, &threads, stress_thread_1, 0);
launch_thread(&err, &threads, stress_thread_1, 0);
launch_thread(&err, &threads, stress_thread_2, 0);
launch_thread(&err, &threads, stress_thread_2, 0);
launch_thread(&err, &threads, stress_thread_3, 0);
launch_thread(&err, &threads, stress_thread_3, 0);
launch_thread(&err, &threads, stress_thread_4, 0);
launch_thread(&err, &threads, stress_thread_4, 0);
launch_thread(&err, &threads, stress_thread_5, 0);
launch_thread(&err, &threads, stress_thread_5, 1);
join_all_threads(&err, &threads);
sqlite3_enable_shared_cache(0);
print_and_free_err(&err);
}
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