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LibPthread: Implement pthread_once()

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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
This commit is contained in:
Sergey Bugaev 2020-11-24 20:45:28 +03:00 • committed by Andreas Kling
parent f6f0d3cbae
commit 3ac0c9b9e7
4 changed files with 110 additions and 2 deletions
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2
Libraries/LibPthread/pthread.h
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@ -67,7 +67,7 @@ int pthread_attr_setstack(pthread_attr_t* attr, void*, size_t);
int pthread_attr_getstacksize(const pthread_attr_t*, size_t*);
int pthread_attr_setstacksize(pthread_attr_t*, size_t);
int pthread_once(pthread_once_t*, void (*)());
int pthread_once(pthread_once_t*, void (*)(void));
#define PTHREAD_ONCE_INIT 0
void* pthread_getspecific(pthread_key_t key);
int pthread_setspecific(pthread_key_t key, const void* value);