文章摘要
这段代码用Erlang语言展示了如何通过协程(coroutine)实现高效的并发数据处理。代码中定义了`receive`、`send`、`producer`、`filter`和`consumer`五个函数: 1. `receive(prod)` 和 `send(x,prod)` 实现了对协程的控制和数据传输。2. `producer()` 函数创建一个协程,不断读取输入并将其通过`send`函数传递给下一个协程。3. `filter(prod)` 函数创建一个协程,接收来自`producer`的值,并将其格式化后重新发送给`consumer`。4. `consumer(f)` 函数创建另一个协程,接收并处理来自`filter`的值,将它们写入输出。 整体展示了`producer-filter-consumer`模式,通过协程实现了数据流的高效传递和处理。
function receive(prod)
print(“receive is called”)
local status,value=coroutine.resume(prod)
return value
end
function receive(prod)
print(“receive is called”)
local status,value=coroutine.resume(prod)
return value
end
function send(x,prod)
print(“send is called”)
return coroutine.yield(x)
end
function producer()
return coroutine.create(function ()
print(“producer is called”)
while true do
print(“producer run again”)
local x=io.read()
send(x)
end
end)
end
function filter(prod)
return coroutine.create(function ()
for line=1,1000 do
print(“enter fliter “..line)
local x=receive(prod)
print(“receive in filter finished”)
x=string.format(“%5d %s”,line,x)
send(x,prod)
end
end)
end
function consumer(prod)
print(“consumer is called”)
while true do
print(“consumer run again”)
local x=receive(prod)
print(“retrun customer”)
io.write(x,”\n”)
end
end
p=producer()
f=filter(p)
consumer(f)
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