Hello,
I'm writing a multithreaded application (sqlite 3.7.9 on linux
i386).
First thread exports some parts of a database, deletes exported records and
starts a vacuum. Second thread tries to write in database.
When my application tries to write data when the other thread is running
vacuum, sqlite3_step() returns SQL_BUSY. I have set busy_timeout to 1000.
If sqlite3_step() returns BUSY_TIMEOUT, I try to restart
statement :
While((result = sqlite3_step(stmt)) == SQLITE_BUSY)
{
Usleep(_random [0s, 1s[_);
}
But this loop always enters in a deadlock : if sqlite3_step() returns
SQLITE_BUSY, and if I try to restart the same statement, it always will returns
SQLITE_BUSY even if there is no other concurrent transaction. If I write :
Int I = 0;
While((result = sqlite3_step(stmt)) == SQLITE_BUSY)
{
Usleep(_random [0s, 1s[_);
If (++I > 10) break;
}
I have forgotten current statement (and data) but following SQL query returns
SQLITE_OK. Why does sqlite3_step() always returns SQLITE_BUSY on a statement
when it has returned SQLITE_BUSY the first time ?
Regards,
JB
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