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Kernel: Make Locker remember whether the lock is held

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This allows temporarily unlocking a lock or re-locking it, and it will
only unlock if it is still being held.

Fixes #4352
This commit is contained in:
Tom 2021-01-14 19:14:10 -07:00 committed by Andreas Kling
parent 29102051d9
commit a51fbb13e8
Notes: sideshowbarker 2024-07-18 23:52:01 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/a51fbb13e8a
Pull-request: https://github.com/SerenityOS/serenity/pull/4953
1 changed files with 18 additions and 3 deletions
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21
Kernel/Lock.h
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@ -110,12 +110,27 @@ public:
{
m_lock.lock(mode);
}
ALWAYS_INLINE ~Locker() { unlock(); }
ALWAYS_INLINE void unlock() { m_lock.unlock(); }
ALWAYS_INLINE void lock(Lock::Mode mode = Lock::Mode::Exclusive) { m_lock.lock(mode); }
ALWAYS_INLINE ~Locker()
{
if (m_locked)
unlock();
}
ALWAYS_INLINE void unlock()
{
ASSERT(m_locked);
m_locked = false;
m_lock.unlock();
}
ALWAYS_INLINE void lock(Lock::Mode mode = Lock::Mode::Exclusive)
{
ASSERT(!m_locked);
m_locked = true;
m_lock.lock(mode);
}
private:
Lock& m_lock;
bool m_locked { true };
};
#ifdef LOCK_DEBUG