Synchronous concurrency: Difference between revisions

=={{header|Wren}}==

<lang ecmascript>import "io" for File

var EOT = "\x04"

var readLines = Fiber.new { |fileName|

var file = File.open(fileName)

var offset = 0

var line = ""

while (true) {

var b = file.readBytes(1, offset)

offset = offset + 1

if (b == "\n") {

Fiber.yield(line)

line = "" // reset line variable

} else if (b == "\r") { // Windows

// wait for following "\n"

} else if (b == "") { // end of stream

var numLines = Fiber.yield(EOT)

System.print("Number of lines read = %(numLines)")

break

} else {

line = line + b

}

}

file.close()

}

var numLines = 0

while(true) {

var line = readLines.call("input.txt")

if (line != EOT) {

System.print(line)

numLines = numLines + 1

} else {

readLines.call(numLines)

break

}

}</lang>

{{out}}

input.txt contains the following 4 lines:

<pre>

line 1

line 2

line 3

line 4

Number of lines read = 4

</pre>