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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_cond.cpp
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@ -98,7 +98,7 @@ int pthread_cond_timedwait(pthread_cond_t* cond, pthread_mutex_t* mutex, const s
// value might change as soon as we unlock it.
u32 value = AK::atomic_fetch_or(&cond->value, NEED_TO_WAKE_ONE | NEED_TO_WAKE_ALL, AK::memory_order_release) | NEED_TO_WAKE_ONE | NEED_TO_WAKE_ALL;
pthread_mutex_unlock(mutex);
int rc = futex_wait(&cond->value, value, abstime, cond->clockid);
int rc = futex_wait(&cond->value, value, abstime, cond->clockid, false);
if (rc < 0 && errno != EAGAIN)
return errno;
@ -129,7 +129,7 @@ int pthread_cond_signal(pthread_cond_t* cond)
if (!(value & NEED_TO_WAKE_ONE)) [[likely]]
return 0;
// ...try to wake someone...
int rc = futex_wake(&cond->value, 1);
int rc = futex_wake(&cond->value, 1, false);
VERIFY(rc >= 0);
// ...and if we have woken someone, put the flag back.
if (rc > 0)
@ -152,7 +152,7 @@ int pthread_cond_broadcast(pthread_cond_t* cond)
pthread_mutex_t* mutex = AK::atomic_load(&cond->mutex, AK::memory_order_relaxed);
VERIFY(mutex);
int rc = futex(&cond->value, FUTEX_REQUEUE, 1, nullptr, &mutex->lock, INT_MAX);
int rc = futex(&cond->value, FUTEX_REQUEUE | FUTEX_PRIVATE_FLAG, 1, nullptr, &mutex->lock, INT_MAX);
VERIFY(rc >= 0);
return 0;
}