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kern: use std::atomic_ref instead of reinterpret_cast to std::atomic

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This commit is contained in:
Michael Scire 2020-08-12 20:47:14 -07:00 committed by SciresM
parent 48e8562033
commit 3c85e37667
1 changed files with 5 additions and 3 deletions
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8
libraries/libmesosphere/source/kern_k_scheduler.cpp
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@ -276,10 +276,12 @@ namespace ams::kern {
void KScheduler::ClearPreviousThread(KThread *thread) {
MESOSPHERE_ASSERT(IsSchedulerLockedByCurrentThread());
for (size_t i = 0; i < cpu::NumCores; ++i) {
std::atomic<KThread *> *prev_thread_ptr = reinterpret_cast<std::atomic<KThread *> *>(std::addressof(Kernel::GetScheduler(static_cast<s32>(i)).prev_thread));
static_assert(sizeof(*prev_thread_ptr) == sizeof(KThread *));
/* Get an atomic reference to the core scheduler's previous thread. */
std::atomic_ref<KThread *> prev_thread(Kernel::GetScheduler(static_cast<s32>(i)).prev_thread);
static_assert(std::atomic_ref<KThread *>::is_always_lock_free);
prev_thread_ptr->compare_exchange_weak(thread, nullptr);
/* Atomically clear the previous thread if it's our target. */
prev_thread.compare_exchange_weak(thread, nullptr);
}
}