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Merge branch 'master' of https://git.cs.tu-dortmund.de/DBIS/beedb

This commit is contained in:
Roland Kühn 2022-04-11 14:49:07 +02:00
parent c6271740bc e35ec43ad8
commit 500641eeb4
3 changed files with 25 additions and 18 deletions
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37
include/concurrency/metadata.h
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@ -54,9 +54,9 @@ class Metadata
: _original_record_identifier(other._original_record_identifier), _begin_timestamp(timestamp::make_infinity()), : _original_record_identifier(other._original_record_identifier), _begin_timestamp(timestamp::make_infinity()),
_end_timestamp(timestamp::make_infinity()) _end_timestamp(timestamp::make_infinity())
{ {
_begin_timestamp.store(other._begin_timestamp.load()); _begin_timestamp = other._begin_timestamp;
_end_timestamp.store(other._end_timestamp.load()); _end_timestamp = other._end_timestamp;
_next_in_version_chain.store(other._next_in_version_chain.load()); _next_in_version_chain = other._next_in_version_chain;
} }
~Metadata() = default; ~Metadata() = default;
@ -66,7 +66,7 @@ class Metadata
*/ */
[[nodiscard]] timestamp begin_timestamp() const [[nodiscard]] timestamp begin_timestamp() const
{ {
return _begin_timestamp.load(); return _begin_timestamp;
} }
/** /**
@ -75,7 +75,7 @@ class Metadata
*/ */
[[nodiscard]] timestamp end_timestamp() const [[nodiscard]] timestamp end_timestamp() const
{ {
return _end_timestamp.load(); return _end_timestamp;
} }
/** /**
@ -83,7 +83,7 @@ class Metadata
*/ */
[[nodiscard]] storage::RecordIdentifier next_in_version_chain() const [[nodiscard]] storage::RecordIdentifier next_in_version_chain() const
{ {
return _next_in_version_chain.load(); return _next_in_version_chain;
} }
/** /**
@ -92,7 +92,7 @@ class Metadata
*/ */
void begin_timestamp(const timestamp timestamp) void begin_timestamp(const timestamp timestamp)
{ {
_begin_timestamp.store(timestamp); _begin_timestamp = timestamp;
} }
/** /**
@ -105,7 +105,11 @@ class Metadata
*/ */
bool try_begin_timestamp(timestamp old_timestamp, const timestamp timestamp) bool try_begin_timestamp(timestamp old_timestamp, const timestamp timestamp)
{ {
return _begin_timestamp.compare_exchange_strong(old_timestamp, timestamp); if (_begin_timestamp == old_timestamp){
_begin_timestamp = timestamp;
return true;
}
return false;
} }
/** /**
@ -114,7 +118,7 @@ class Metadata
*/ */
void end_timestamp(const timestamp timestamp) void end_timestamp(const timestamp timestamp)
{ {
_end_timestamp.store(timestamp); _end_timestamp = timestamp;
} }
/** /**
@ -127,7 +131,11 @@ class Metadata
*/ */
bool try_end_timestamp(timestamp old_timestamp, const timestamp timestamp) bool try_end_timestamp(timestamp old_timestamp, const timestamp timestamp)
{ {
return _end_timestamp.compare_exchange_strong(old_timestamp, timestamp); if (_end_timestamp == old_timestamp){
_end_timestamp = timestamp;
return true;
}
return false;
} }
/** /**
@ -136,7 +144,7 @@ class Metadata
*/ */
void next_in_version_chain(const storage::RecordIdentifier next) void next_in_version_chain(const storage::RecordIdentifier next)
{ {
_next_in_version_chain.store(next); _next_in_version_chain = next;
} }
/** /**
@ -147,17 +155,16 @@ class Metadata
return _original_record_identifier; return _original_record_identifier;
} }
private:
// Pointer to the record in the table space. // Pointer to the record in the table space.
storage::RecordIdentifier _original_record_identifier; storage::RecordIdentifier _original_record_identifier;
// Timestamp the record begins living. // Timestamp the record begins living.
std::atomic<timestamp> _begin_timestamp; timestamp _begin_timestamp;
// Timestamp the record dies. // Timestamp the record dies.
std::atomic<timestamp> _end_timestamp; timestamp _end_timestamp;
// Pointer to the next record in version chain. // Pointer to the next record in version chain.
std::atomic<storage::RecordIdentifier> _next_in_version_chain; storage::RecordIdentifier _next_in_version_chain;
}; };
} // namespace beedb::concurrency } // namespace beedb::concurrency