This is a swapping-queue, implement by double-ring-linklist, be careful that this version only use it in one producer and one comsumer model!

How to use?
	You can use it as your src file, certainly you can compile it to a lib then include and call it.
	when you compile it, you must contain "-lpthread -lrt"

How to run the test?
	Simply use the cmd:
		gcc swap_queue.c test.c -lpthread -lrt -o test
	then use the cmd:
		./test

License: MIT
	have fun!

Author: louluo<[email protected]>