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LibPthread: Implement destruction of pthread_keys

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Add a function to destroy any keys that were set on the current thread
using the algorithm from Dr. POSIX's pthread_key_create. Add some
defines to pthread.h for pthread key use, and implement
pthread_key_delete. It has a prototype in pthread.h, but any program
trying to actually use it would be in for a link-time surprise.

Currently, keys are destroyed either via global destructors, with the
s_key_destroyer object, or in exit_thread. exit_thread is invoked by
pthread_exit, and transitively by pthread_create, via the
pthread_create_helper that ensures all threads created with the pthread
API properly clean up for themselves when they exit gracefully.

A future patch might make s_key_destroyer a C++11 thread_local instead,
assuming we get thread_local and thread_local destructors working.
This commit is contained in:
Andrew Kaster 2020-12-31 20:50:59 -07:00 • committed by Andreas Kling
parent 9dc8bea3e7
commit 7b94ca21b3
2 changed files with 57 additions and 5 deletions
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3
Libraries/LibPthread/pthread.h
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@ -87,6 +87,9 @@ int pthread_setschedparam(pthread_t thread, int policy, const struct sched_param
0, 0, CLOCK_MONOTONIC_COARSE \
}
#define PTHREAD_KEYS_MAX 64
#define PTHREAD_DESTRUCTOR_ITERATIONS 4
int pthread_key_create(pthread_key_t* key, void (*destructor)(void*));
int pthread_key_delete(pthread_key_t key);
int pthread_cond_broadcast(pthread_cond_t*);