C++ program freezes with 100% CPU in the middle of cout statement - c++

Question

I'm writing a simple graph generator that stores the graphs in a MySQL database.
Here's the output:
Connecting to database...Success!
Checking for unfinished vertices...Completed last n = 7
Creating n8 table...Success!
Notice it doesn't print "Generating..." which is part of the same statement. It freezes just like this with 100% CPU. The table does actually get created in the database.
Also, If I start from n = 1, it runs until n7 and then freezes.
Here's the code (not the entire thing, just this part):
int main()
{
int n = 0;
if (initialize(n)) {
int limit = 8;
if (limit >= n) {
for (; n <= limit; n++) {
stringstream qs;
qs << "CREATE TABLE n" << n << " (idbin TEXT("
<< getLengthOfBinaryByN(n) << ") NOT NULL,vertices INT NOT NULL)";
cout << "Creating n" << n << " table...";
if (runQuery(qs.str())) {
cout << "Success!" << endl
<< "Generating all graphs on " << n << " vertices";
generateGraphs(n);
} else {
cout << "Failed!" << endl;
}
}
} else {
cout << "ERROR: Must be greater than or equal to " << n << endl;
return 1;
}
}
return 0;
}
After some research I found that a "deadlock" may be occurring, but I have no idea how to fix that. Any ideas?
Here's the runQuery function if that helps:
/*
runQuery: runs the sql query, assumes that database connected successfully
Parameters: query
returns a bool
*/
bool runQuery(string query)
{
try {
stmt = con->createStatement();
res = stmt->executeQuery(query);
delete stmt;
} catch (sql::SQLException &e) {
if (e.getErrorCode() != 0 && e.getErrorCode() != 1050) {
cout << "# ERR: SQLException in " << __FILE__
<< "(" << __FUNCTION__ << ") on line " << __LINE__ << endl
<< "# ERR: " << e.what()
<< " (MySQL error code: " << e.getErrorCode()
<< ", SQLState: " << e.getSQLState() << " )" << endl;
return false;
}
return true;
}
return true;
}