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Kernel: Minor Lock optimization

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Tom
2020-10-28 20:03:15 -06:00
committed by Andreas Kling
parent b4c9e85056
commit 66f46d03e4
1 changed files with 2 additions and 4 deletions
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6
Kernel/Lock.cpp
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@@ -52,8 +52,7 @@ void Lock::lock(Mode mode)
} }
auto current_thread = Thread::current(); auto current_thread = Thread::current();
for (;;) { for (;;) {
bool expected = false; if (m_lock.exchange(true, AK::memory_order_acq_rel) == false) {
if (m_lock.compare_exchange_strong(expected, true, AK::memory_order_acq_rel)) {
do { do {
// FIXME: Do not add new readers if writers are queued. // FIXME: Do not add new readers if writers are queued.
bool modes_dont_conflict = !modes_conflict(m_mode, mode); bool modes_dont_conflict = !modes_conflict(m_mode, mode);
@@ -91,8 +90,7 @@ void Lock::unlock()
{ {
auto current_thread = Thread::current(); auto current_thread = Thread::current();
for (;;) { for (;;) {
bool expected = false; if (m_lock.exchange(true, AK::memory_order_acq_rel) == false) {
if (m_lock.compare_exchange_strong(expected, true, AK::memory_order_acq_rel)) {
ASSERT(m_times_locked); ASSERT(m_times_locked);
--m_times_locked; --m_times_locked;