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Kernel: Clean up sys$futex and add support for cross-process futexes

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This commit is contained in:
Idan Horowitz 2022-07-14 01:25:35 +03:00 • committed by Andreas Kling
parent 55c7496200
commit 9db10887a1
9 changed files with 164 additions and 70 deletions
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6
Userland/Libraries/LibC/pthread_integration.cpp
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@ -155,7 +155,7 @@ int pthread_mutex_lock(pthread_mutex_t* mutex)
value = AK::atomic_exchange(&mutex->lock, MUTEX_LOCKED_NEED_TO_WAKE, AK::memory_order_acquire);
while (value != MUTEX_UNLOCKED) {
futex_wait(&mutex->lock, value, nullptr, 0);
futex_wait(&mutex->lock, value, nullptr, 0, false);
value = AK::atomic_exchange(&mutex->lock, MUTEX_LOCKED_NEED_TO_WAKE, AK::memory_order_acquire);
}
@ -172,7 +172,7 @@ int __pthread_mutex_lock_pessimistic_np(pthread_mutex_t* mutex)
// because we know we don't. Used in the condition variable implementation.
u32 value = AK::atomic_exchange(&mutex->lock, MUTEX_LOCKED_NEED_TO_WAKE, AK::memory_order_acquire);
while (value != MUTEX_UNLOCKED) {
futex_wait(&mutex->lock, value, nullptr, 0);
futex_wait(&mutex->lock, value, nullptr, 0, false);
value = AK::atomic_exchange(&mutex->lock, MUTEX_LOCKED_NEED_TO_WAKE, AK::memory_order_acquire);
}
@ -195,7 +195,7 @@ int pthread_mutex_unlock(pthread_mutex_t* mutex)
u32 value = AK::atomic_exchange(&mutex->lock, MUTEX_UNLOCKED, AK::memory_order_release);
if (value == MUTEX_LOCKED_NEED_TO_WAKE) [[unlikely]] {
int rc = futex_wake(&mutex->lock, 1);
int rc = futex_wake(&mutex->lock, 1, false);
VERIFY(rc >= 0);
}