Herb Sutter GotW95: Thread Safety and Synchronisation

Excellent article on thread safety and synchronisation from Herb Sutter.

A race condition occurs when two threads access the same shared variable concurrently, and at least one is a non-const operation (writer). Concurrent const operations are valid, and do not race with each other.

Guideline: A type should only be fully internally synchronized if and only if its purpose is to provide inter-thread communication (e.g., a message queue) or synchronization (e.g., a mutex).

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