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LibC: Add __pthread_mutex_lock_pessimistic_np()

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This is a private function that locks the lock much like the regular
pthread_mutex_lock(), but causes the corresponding unlock operation to
always assume there may be other waiters. This is useful in case some
waiters are made to wait on the mutex's futex directly, without going
through pthread_mutex_lock(). This is going to be used by the condition
variable implementation in the next commit.
This commit is contained in:
Sergey Bugaev 2021-07-05 14:55:57 +03:00 • committed by Andreas Kling
parent 19bef90923
commit 5536f3c277
2 changed files with 17 additions and 0 deletions
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Userland/Libraries/LibC/bits/pthread_integration.h
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@ -21,6 +21,7 @@ void __pthread_fork_atfork_register_child(void (*)(void));
int __pthread_mutex_init(pthread_mutex_t*, const pthread_mutexattr_t*);
int __pthread_mutex_lock(pthread_mutex_t*);
int __pthread_mutex_trylock(pthread_mutex_t*);
int __pthread_mutex_lock_pessimistic_np(pthread_mutex_t*);
int __pthread_mutex_unlock(pthread_mutex_t*);
typedef void (*KeyDestructor)(void*);