Lua之协同程序coroutine代码实例

do
	--create coroutine table
	--coroutine state: suspended, running, dead, normal
	--when create the coroutine, the status is suspended, after calling it, the status is dead
	--get the coroutine status by the way coroutine.status
	local coa = 0;
	local cob = 0;

	function createcoroutinea()

		coa = coroutine.create(
										function()
											--for i = 0, 10 do
												print("coa: ", 0);
												print("cob status: ", coroutine.status(cob)); --normal status
												print("coa status: ", coroutine.status(coa));
												print("coa coroutine next status");
												--coroutine.yield();--the current coroutine is suspended
											--end
										end
									);
		print("from coa to resume cob");
	end


	function createcoroutineb()

		cob = coroutine.create(
										function()
											--for i = 0, 10 do
												print("cob: ", 0);
												print("coa status: ", coroutine.status(coa));
												coroutine.resume(coa); --when resume coa, the cob will suspended, calling cob ,the coa status is
												--suspended and dead, this time will continue to execute the next code
												print("cob status: ", coroutine.status(cob));
												print("cob coroutine next status");
												--coroutine.yield();
											--end
										end
									);
		print("from cob to resume coa");
	end

	--display the coa and cob status
	createcoroutinea();
	print(coroutine.status(coa));

	createcoroutineb();
	print(coroutine.status(cob));

	coroutine.resume(cob);
	print(coroutine.resume(cob)); --if the coroutine is dead ,the resume will resume false, and can't resume the dead coroutine
	--print("coa status: ", coroutine.status(coa));
	--print("cob status: ", coroutine.status(cob));
end

注：
resume得到返回值，
如果有对应的yield在wait resume，那么yield的参数作为resum的返回值，第一个返回值表示coroutine没有错误，后面的返回值个数及其值视yeild参数而定。
如果没有yield在wait,那么返回值是对应函数的返回值,:true,* * *

do
	--create coroutine table
	--coroutine state: suspended, running, dead, normal
	--when create the coroutine, the status is suspended, after calling it, the status is dead
	--get the coroutine status by the way coroutine.status
	local coa = 0;
	local cob = 0;

	function createcoroutinea()

		coa = coroutine.create(
										function(parama, paramb)
											--for i = 0, 10 do
												print("coa: ", 0);
												coroutine.yield(parama, paramb);--the current coroutine is suspended
											--end
											return 100, 200;
										end
									);
		print("from coa to resume cob");
	end


	function createcoroutineb()

		cob = coroutine.create(
										function()
											--for i = 0, 10 do
												print("cob: ", 0);
												print("coa status: ", coroutine.status(coa));
												coroutine.resume(coa); --when resume coa, the cob will suspended, calling cob ,the coa status is
												--suspended and dead, this time will continue to execute the next code
												print("cob status: ", coroutine.status(cob));
												print("cob coroutine next status");
												--coroutine.yield();
											--end
										end
									);
		print("from cob to resume coa");
	end
	createcoroutinea();
	--if not yield is waiting ,the return values that the main function return as the results of the resume
	--or the return as the yield params
	print( coroutine.resume(coa, 10, 20));--output:true, 10, 20



end