Esempi in C++ (Cpp) per SET_LOCKTAG_SHARD_METADATA_RESOURCE

Esempio n. 1

File: resource_lock.c Progetto: ConstructAgility/citus

/*
 * LockShardDistributionMetadata returns after grabbing a lock for distribution
 * metadata related to the specified shard, blocking if required. ExclusiveLock
 * and ShareLock modes are supported. Any locks acquired using this method are
 * released at transaction end.
 */
void
LockShardDistributionMetadata(int64 shardId, LOCKMODE lockMode)
{
	LOCKTAG tag;
	const bool sessionLock = false;
	const bool dontWait = false;

	SET_LOCKTAG_SHARD_METADATA_RESOURCE(tag, MyDatabaseId, shardId);

	(void) LockAcquire(&tag, lockMode, sessionLock, dontWait);
}

Esempio n. 2

File: resource_lock.c Progetto: zmyer/citus

/*
 * TryLockShardDistributionMetadata tries to grab a lock for distribution
 * metadata related to the specified shard, returning false if the lock
 * is currently taken. Any locks acquired using this method are released
 * at transaction end.
 */
bool
TryLockShardDistributionMetadata(int64 shardId, LOCKMODE lockMode)
{
	LOCKTAG tag;
	const bool sessionLock = false;
	const bool dontWait = true;
	bool lockAcquired = false;

	SET_LOCKTAG_SHARD_METADATA_RESOURCE(tag, MyDatabaseId, shardId);

	lockAcquired = LockAcquire(&tag, lockMode, sessionLock, dontWait);

	return lockAcquired;
}