ClickHouse/dbms/Storages/TableStructureLockHolder.h

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#pragma once
#include <Common/RWLock.h>
namespace DB
{
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/// Structs that hold table structure (columns, their types, default values etc.) locks when executing queries.
/// See IStorage::lock* methods for comments.
struct TableStructureWriteLockHolder
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{
void release()
{
*this = TableStructureWriteLockHolder();
}
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void releaseAllExceptAlterIntention()
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{
new_data_structure_lock.reset();
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structure_lock.reset();
}
private:
friend class IStorage;
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/// Order is important.
RWLockImpl::LockHolder alter_intention_lock;
RWLockImpl::LockHolder new_data_structure_lock;
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RWLockImpl::LockHolder structure_lock;
};
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struct TableStructureReadLockHolder
{
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void release()
{
*this = TableStructureReadLockHolder();
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}
private:
friend class IStorage;
/// Order is important.
RWLockImpl::LockHolder new_data_structure_lock;
RWLockImpl::LockHolder structure_lock;
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};
}