test/tt3_shared.c

   1 /*
   2 ** 2020 September 5
   3 **
   4 ** The author disclaims copyright to this source code.  In place of
   5 ** a legal notice, here is a blessing:
   6 **
   7 **    May you do good and not evil.
   8 **    May you find forgiveness for yourself and forgive others.
   9 **    May you share freely, never taking more than you give.
  10 **
  11 *************************************************************************
  12 **
  13 **
  14 */
  15
  16
  17 /*
  18 */
  19 static char *shared_thread1(int iTid, void *pArg){
  20   Error err = {0};                /* Error code and message */
  21
  22   while( !timetostop(&err) ){
  23     Sqlite db = {0};              /* SQLite database connection */
  24     opendb(&err, &db, "test.db", 0);
  25     sql_script(&err, &db, "SELECT * FROM t1");
  26     closedb(&err, &db);
  27   }
  28   print_and_free_err(&err);
  29   return sqlite3_mprintf("done!");
  30 }
  31
  32
  33 static void shared1(int nMs){
  34   Error err = {0};
  35   Sqlite db = {0};              /* SQLite database connection */
  36   Threadset threads = {0};
  37   int ii;
  38
  39   opendb(&err, &db, "test.db", 1);
  40   sql_script(&err, &db, "CREATE TABLE t1(x)");
  41   closedb(&err, &db);
  42
  43   setstoptime(&err, nMs);
  44   sqlite3_enable_shared_cache(1);
  45
  46   for(ii=0; ii<5; ii++){
  47     launch_thread(&err, &threads, shared_thread1, 0);
  48   }
  49
  50   join_all_threads(&err, &threads);
  51   sqlite3_enable_shared_cache(0);
  52
  53   print_and_free_err(&err);
  54 }
  55