uWSGI supports a configurable number of locks you can use to synchronize worker processes. Lock 0 (zero) is always available, but you can add more with the locks option. If your app has a lot of critical areas, holding and releasing the same lock over and over again can kill performance.
def use_lock_zero_for_important_things():
uwsgi.lock() # Implicit parameter 0
# Critical section
uwsgi.unlock() # Implicit parameter 0
def use_another_lock():
uwsgi.lock(1)
time.sleep(1) # Take that, performance! Ha!
uwsgi.unlock(1)
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