ferbfletcher Posted May 20, 2015 Share Posted May 20, 2015 (edited) Is SQLITE.DLL compiled with HAVE_USLEEP=1 ?This options allows for better multi-user capability because of shorter lockouts. All systems today have usleep capability, so that option should be enabled with the compile flags. Without that compile option, sqlite will sleep in 1 second intervals instead of millisecond intervals. Edited May 20, 2015 by ferbfletcher Link to comment Share on other sites More sharing options...
jchd Posted May 20, 2015 Share Posted May 20, 2015 (edited) Only low-end embedded systems don't offer usleep or an equivalent, so this is enabled for major desktop-class platform. In particular, SQLITE_OS_WIN overrides HAVE_USLEEP.This is what is used in main.c/* ** This routine implements a busy callback that sleeps and tries ** again until a timeout value is reached. The timeout value is ** an integer number of milliseconds passed in as the first ** argument. */ static int sqliteDefaultBusyCallback( void *ptr, /* Database connection */ int count /* Number of times table has been busy */ ){ #if SQLITE_OS_WIN || (defined(HAVE_USLEEP) && HAVE_USLEEP) static const u8 delays[] = { 1, 2, 5, 10, 15, 20, 25, 25, 25, 50, 50, 100 }; static const u8 totals[] = { 0, 1, 3, 8, 18, 33, 53, 78, 103, 128, 178, 228 }; # define NDELAY ArraySize(delays) sqlite3 *db = (sqlite3 *)ptr; int timeout = db->busyTimeout; int delay, prior; ...BTW you seem to care about "multi-users". I hope you meant multi-process (i.e. several processes and/or threads) on a local DB only. Remote use would bite you severely and usleep would be the latest of your issues. Edited May 20, 2015 by jchd Clarify about multi-users or not. This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe hereRegExp tutorial: enough to get startedPCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta. SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt) Link to comment Share on other sites More sharing options...
ferbfletcher Posted May 21, 2015 Author Share Posted May 21, 2015 Yes, multi processes on the same system. From the sqlite's point of view, it would be multi users, but yes that is what I meant on the same system. Thank you for the information regarding "SQLITE_OS_WIN" to show that sqlite will sleep in millisecond intervals! Link to comment Share on other sites More sharing options...
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