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mutex (locks) [09afd1bb]

1. POSIX Mutexes `pthread_mutex`

pubs.opengroup.org/onlinepubs/009604499/functions/pthread_mutex_lock.html
The way posix mutexes are implemented, especially because they require so much semantics, makes them impossible to allocate efficiently
- www.youtube.com/watch?v=IznEq2Uf2xk&list=PLpIELpJvZsvcZAyx4NruEccCVlNZGKODs&index=16

2. Locking Engineering Principles