Created: 2022-01-20T17:41:08-06:00
When read/write locks are used to protect data being changed.
A read lock means someone is currently reading the data.
A write lock means someone is currently changing the data.
Multiple read locks are allowed at any given time.
Only one write lock is allowed at a given time.
A write lock cannot be out while people are reading.
NB you might need a pending-write lock as well so a mutator can wait in a queue for reads to finish and new reads can't block the writer from ever being able to make the changes.