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#pragma once
#include <AK/Assertions.h>
#include <AK/Types.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/KSyms.h>
#include <Kernel/Scheduler.h>
class Thread;
extern Thread* current;
static inline u32 CAS(volatile u32* mem, u32 newval, u32 oldval)
{
u32 ret;
asm volatile(
"cmpxchgl %2, %1"
: "=a"(ret), "+m"(*mem)
: "r"(newval), "0"(oldval)
: "cc", "memory");
return ret;
}
class Lock {
public:
Lock(const char* name = nullptr)
: m_name(name)
{
}
~Lock() {}
void lock();
void unlock();
bool unlock_if_locked();
const char* name() const { return m_name; }
private:
volatile u32 m_lock { 0 };
u32 m_level { 0 };
Thread* m_holder { nullptr };
const char* m_name { nullptr };
};
class Locker {
public:
[[gnu::always_inline]] inline explicit Locker(Lock& l)
: m_lock(l)
{
lock();
}
[[gnu::always_inline]] inline ~Locker() { unlock(); }
[[gnu::always_inline]] inline void unlock() { m_lock.unlock(); }
[[gnu::always_inline]] inline void lock() { m_lock.lock(); }
private:
Lock& m_lock;
};
#define LOCKER(lock) Locker locker(lock)
template<typename T>
class Lockable {
public:
Lockable() {}
Lockable(T&& resource)
: m_resource(move(resource))
{
}
Lock& lock() { return m_lock; }
T& resource() { return m_resource; }
T lock_and_copy()
{
LOCKER(m_lock);
return m_resource;
}
private:
T m_resource;
Lock m_lock;
};
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