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Kernel: Minor SpinLock improvements

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Tom 2020-10-27 20:46:32 -06:00 • committed by Andreas Kling
parent e26e0445b5
commit b4c9e85056
1 changed files with 7 additions and 9 deletions
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16
Kernel/SpinLock.h
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@ -45,10 +45,8 @@ public:
{ {
u32 prev_flags; u32 prev_flags;
Processor::current().enter_critical(prev_flags); Processor::current().enter_critical(prev_flags);
BaseType expected = 0; while (m_lock.exchange(1, AK::memory_order_acquire) != 0) {
while (!m_lock.compare_exchange_strong(expected, 1, AK::memory_order_acq_rel)) {
Processor::wait_check(); Processor::wait_check();
expected = 0;
} }
return prev_flags; return prev_flags;
} }
@ -62,12 +60,12 @@ public:
ALWAYS_INLINE bool is_locked() const ALWAYS_INLINE bool is_locked() const
{ {
return m_lock.load(AK::memory_order_consume) != 0; return m_lock.load(AK::memory_order_relaxed) != 0;
} }
ALWAYS_INLINE void initialize() ALWAYS_INLINE void initialize()
{ {
m_lock.store(0, AK::memory_order_release); m_lock.store(0, AK::memory_order_relaxed);
} }
private: private:
@ -101,7 +99,7 @@ public:
ALWAYS_INLINE void unlock(u32 prev_flags) ALWAYS_INLINE void unlock(u32 prev_flags)
{ {
ASSERT(m_recursions > 0); ASSERT(m_recursions > 0);
ASSERT(m_lock.load(AK::memory_order_consume) == FlatPtr(&Processor::current())); ASSERT(m_lock.load(AK::memory_order_relaxed) == FlatPtr(&Processor::current()));
if (--m_recursions == 0) if (--m_recursions == 0)
m_lock.store(0, AK::memory_order_release); m_lock.store(0, AK::memory_order_release);
Processor::current().leave_critical(prev_flags); Processor::current().leave_critical(prev_flags);
@ -109,17 +107,17 @@ public:
ALWAYS_INLINE bool is_locked() const ALWAYS_INLINE bool is_locked() const
{ {
return m_lock.load(AK::memory_order_consume) != 0; return m_lock.load(AK::memory_order_relaxed) != 0;
} }
ALWAYS_INLINE bool own_lock() const ALWAYS_INLINE bool own_lock() const
{ {
return m_lock.load(AK::memory_order_consume) == FlatPtr(&Processor::current()); return m_lock.load(AK::memory_order_relaxed) == FlatPtr(&Processor::current());
} }
ALWAYS_INLINE void initialize() ALWAYS_INLINE void initialize()
{ {
m_lock.store(0, AK::memory_order_release); m_lock.store(0, AK::memory_order_relaxed);
} }
private: private: