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AK: Add Atomic.h
Use gcc built-in atomics
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6 changed files with 606 additions and 53 deletions
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@ -2,6 +2,7 @@
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#include <AK/Assertions.h>
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#include <AK/Types.h>
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#include <AK/Atomic.h>
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#include <Kernel/Arch/i386/CPU.h>
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#include <Kernel/KSyms.h>
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#include <Kernel/Scheduler.h>
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class Thread;
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extern Thread* current;
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static inline u32 CAS(volatile u32* mem, u32 newval, u32 oldval)
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{
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u32 ret;
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asm volatile(
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"cmpxchgl %2, %1"
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: "=a"(ret), "+m"(*mem)
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: "r"(newval), "0"(oldval)
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: "cc", "memory");
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return ret;
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}
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class Lock {
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public:
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Lock(const char* name = nullptr)
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@ -35,7 +25,7 @@ public:
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const char* name() const { return m_name; }
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private:
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volatile u32 m_lock { 0 };
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Atomic<bool> m_lock { false };
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u32 m_level { 0 };
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Thread* m_holder { nullptr };
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const char* m_name { nullptr };
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