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Kernel: Add ScopedLockRelease to temporarily release a Lock

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Tom 2021-02-06 11:33:31 -07:00 • committed by Andreas Kling
parent a808fff2ec
commit 1110c659ee
Notes: sideshowbarker 2024-07-18 17:25:39 +09:00
1 changed files with 51 additions and 0 deletions
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51
Kernel/Lock.h
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@ -122,6 +122,9 @@ public:
#endif
}
Lock& get_lock() { return m_lock; }
const Lock& get_lock() const { return m_lock; }
private:
Lock& m_lock;
bool m_locked { true };
@ -149,4 +152,52 @@ private:
Lock m_lock;
};
class ScopedLockRelease {
AK_MAKE_NONCOPYABLE(ScopedLockRelease);
public:
ScopedLockRelease& operator=(ScopedLockRelease&&) = delete;
ScopedLockRelease(Lock& lock)
: m_lock(&lock)
, m_previous_mode(lock.force_unlock_if_locked(m_previous_recursions))
{
}
ScopedLockRelease(ScopedLockRelease&& from)
: m_lock(exchange(from.m_lock, nullptr))
, m_previous_mode(exchange(from.m_previous_mode, Lock::Mode::Unlocked))
, m_previous_recursions(exchange(from.m_previous_recursions, 0))
{
}
~ScopedLockRelease()
{
if (m_lock && m_previous_mode != Lock::Mode::Unlocked)
m_lock->restore_lock(m_previous_mode, m_previous_recursions);
}
void restore_lock()
{
VERIFY(m_lock);
if (m_previous_mode != Lock::Mode::Unlocked) {
m_lock->restore_lock(m_previous_mode, m_previous_recursions);
m_previous_mode = Lock::Mode::Unlocked;
m_previous_recursions = 0;
}
}
void do_not_restore()
{
VERIFY(m_lock);
m_previous_mode = Lock::Mode::Unlocked;
m_previous_recursions = 0;
}
private:
Lock* m_lock;
Lock::Mode m_previous_mode;
u32 m_previous_recursions;
};
}