Sorry if I created any confusion there were some code that seemed to have called Sqlite_reset simultaneously from more than one thread, even though the statements were unique for each thread the call to the library was not locked. I know assumptions are bad but I thought that reset on a unique statement should not have to be locked and serialized, but now I think it might, so now every single call to the library gets locked in a critical section and it seems to work.
However finalize worked because it seems that finalize can be called without synchronizing. -----Original Message----- From: Andre du Plessis [mailto:[EMAIL PROTECTED] Sent: 19 June 2007 07:21 PM To: sqlite-users@sqlite.org Subject: [sqlite] More SQLite Misuse DLL version Sqlite3.3.17 The os is windows After the last query of sqlite3_step I decided to so some more tests, with threads, if synchronized properly, it seems that you can use more than one thread without any problem as long as Sqlite3_finalize is called is this correct? Please note that this is a very simple query being executed : "select * from threads where id = 1" Imagine in the following scenarios both threads are executing simultaneously and will lock on the global critical section (so they are synchronized) Using the same DB handle. Scenario 1 THREAD1 THREAD2 LockGlobalCriticalSection LockGlobalCriticalSection Sqlite3_prepare Sqlite3_prepare Sqlite3_step Sqlite3_step <-------------------- SQLITE_MISUSE: library routine called out of sequence here Sqlite3_reset Sqlite3_reset UnLockGlobalCriticalSection UnLockGlobalCriticalSection // The following code works fine though THREAD1 THREAD2 LockGlobalCriticalSection LockGlobalCriticalSection Sqlite3_prepare Sqlite3_prepare Sqlite3_step Sqlite3_step Sqlite3_finalize Sqlite3_finalize UnLockGlobalCriticalSection UnLockGlobalCriticalSection If my tests are correct it is not possible to retain a prepared statement across threads. And has to be reprepared each time ?? ----------------------------------------------------------------------------- To unsubscribe, send email to [EMAIL PROTECTED] -----------------------------------------------------------------------------
