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kern: improve KLightLock accuracy

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This commit is contained in:
Michael Scire 2020-07-25 04:28:44 -07:00 • committed by SciresM
parent 1448068b69
commit 4ac94e9179
3 changed files with 15 additions and 8 deletions
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15
libraries/libmesosphere/include/mesosphere/kern_k_light_lock.hpp
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@ -31,15 +31,18 @@ namespace ams::kern {
MESOSPHERE_ASSERT_THIS();
const uintptr_t cur_thread = reinterpret_cast<uintptr_t>(GetCurrentThreadPointer());
const uintptr_t cur_thread_tag = (cur_thread | 1);
while (true) {
uintptr_t old_tag = this->tag.load(std::memory_order_relaxed);
while (!this->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 | 1))) {
if ((old_tag == 0) || ((old_tag | 1) == cur_thread_tag)) {
break;
}
@ -52,9 +55,11 @@ namespace ams::kern {
const uintptr_t cur_thread = reinterpret_cast<uintptr_t>(GetCurrentThreadPointer());
uintptr_t expected = cur_thread;
if (!this->tag.compare_exchange_weak(expected, 0, std::memory_order_release)) {
this->UnlockSlowPath(cur_thread);
}
do {
if (expected != cur_thread) {
return this->UnlockSlowPath(cur_thread);
}
} while (!this->tag.compare_exchange_weak(expected, 0, std::memory_order_release));
}
void LockSlowPath(uintptr_t owner, uintptr_t cur_thread);