Lock is not reliable

[nikolai-b]

If the process running "redis-semaphore" dies after blpop (or lpop) and before hset then the the key is lost for good https://github.com/dv/redis-semaphore/blob/master/lib/redis/semaphore.rb#L65-L73

redis-semaphore/lib/redis/semaphore.rb

Lines 65 to 73 in 8653045

	_key, current_token = @redis.blpop(available_key, timeout || 0)
	else
	current_token = @redis.lpop(available_key)
	end
	return false if current_token.nil?
	@tokens.push(current_token)
	@redis.hset(grabbed_key, current_token, current_time.to_f)

I don't think you can use a multi command here https://redis.io/commands/blpop#codeblpopcode-inside-a-codemulticode--codeexeccode-transaction