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kern: use 13.0.0 revised KLightLock logic

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This commit is contained in:
Michael Scire
2021-10-19 02:45:29 -07:00
parent 3fc695aff8
commit 52332e8d75
2 changed files with 12 additions and 15 deletions
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19
libraries/libmesosphere/include/mesosphere/kern_k_light_lock.hpp
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@@ -37,16 +37,12 @@ namespace ams::kern {
uintptr_t old_tag = m_tag.load(std::memory_order_relaxed);
while (!m_tag.compare_exchange_weak(old_tag, (old_tag == 0) ? cur_thread : old_tag | 1, std::memory_order_acquire)) {
if ((old_tag | 1) == cur_thread_tag) {
return;
}
/* ... */
}
if ((old_tag == 0) || ((old_tag | 1) == cur_thread_tag)) {
if (old_tag == 0 || this->LockSlowPath(old_tag | 1, cur_thread)) {
break;
}
this->LockSlowPath(old_tag | 1, cur_thread);
}
}
@@ -54,15 +50,14 @@ namespace ams::kern {
MESOSPHERE_ASSERT_THIS();
const uintptr_t cur_thread = reinterpret_cast<uintptr_t>(GetCurrentThreadPointer());
uintptr_t expected = cur_thread;
do {
if (expected != cur_thread) {
return this->UnlockSlowPath(cur_thread);
}
} while (!m_tag.compare_exchange_weak(expected, 0, std::memory_order_release));
if (!m_tag.compare_exchange_strong(expected, 0, std::memory_order_release)) {
this->UnlockSlowPath(cur_thread);
}
}
void LockSlowPath(uintptr_t owner, uintptr_t cur_thread);
bool LockSlowPath(uintptr_t owner, uintptr_t cur_thread);
void UnlockSlowPath(uintptr_t cur_thread);
ALWAYS_INLINE bool IsLocked() const { return m_tag.load() != 0; }