One possibility is to use a lock file. Look for portalocker.py in the gluon directory and the Session class which uses portalocker.py for use. Needing this functionality should be rare, multiple requests run on different threads so no collisions in the controller should occur. The database should keep multiple requests separated. If I could ask what requires this maybe there is a better way than a lock file or a way to avoid the problem. Using a lock file can lead to serious contention depending on how many users and the duration of the lock.
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