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LibPthread: Implement pthread_once()
The implementation uses atomics and futexes (yay!) and is heavily based on the implementation I did for my learning project named "Let's write synchronization primitives" [0]. That project, in fact, started when I tried to implement pthread_once() for Serenity (because it was needed for another project of mine, stay tuned ;) ) and was not very sure I got every case right. So now, after learning some more about code patterns around atomics and futexes, I am reasonably sure, and it's time to contribute the implementation of pthread_once() to Serenity :^) [0] To be published at https://github.com/bugaevc/lets-write-sync-primitives
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set(SOURCES
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pthread.cpp
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pthread_once.cpp
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)
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serenity_libc(LibPthread pthread)
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