Hello, I am studying with "Professional Node.js by Pedro Teixeira" Korean
Edition.
In 55page, "Event Loop Blocking" section, I can't understand this code.
process.nextTick(function nextTick1(){
var a = 0;
while(true){
a++;
//console.log("CURRENT : "+a);
if(a%100000000==0){
console.log("CURRENT PER LONGTIME : "+a);
}
}
});
process.nextTick(function nextTick2(){
console.log("Next Tick");
});
setTimeout(function timeout(){
console.log("TIMEOUT");
}, 1000);
RESULT
==================
CURRENT PER LONGTIME : 100000000
CURRENT PER LONGTIME : 200000000
CURRENT PER LONGTIME : 300000000
CURRENT PER LONGTIME : 400000000
CURRENT PER LONGTIME : 500000000
CURRENT PER LONGTIME : 600000000
CURRENT PER LONGTIME : 700000000
CURRENT PER LONGTIME : 800000000
CURRENT PER LONGTIME : 900000000
CURRENT PER LONGTIME : 1000000000
CURRENT PER LONGTIME : 1100000000
CURRENT PER LONGTIME : 1200000000
CURRENT PER LONGTIME : 1300000000
...
...
...
==================
nextTick2(), timeout() is never execute in this code's result.
only "while loop" would lasts.
I expected this,
EXPECTED RESULT
==================
CURRENT PER LONGTIME : 100000000
CURRENT PER LONGTIME : 200000000
CURRENT PER LONGTIME : 300000000
CURRENT PER LONGTIME : 400000000
CURRENT PER LONGTIME : 500000000
CURRENT PER LONGTIME : 600000000
CURRENT PER LONGTIME : 700000000
NextTick
CURRENT PER LONGTIME : 800000000
CURRENT PER LONGTIME : 900000000
CURRENT PER LONGTIME : 1000000000
CURRENT PER LONGTIME : 1100000000
TIMEOUT
CURRENT PER LONGTIME : 1200000000
CURRENT PER LONGTIME : 1300000000
...
...
...
==================
how can I change this code to get "EXPECTED RESULT"?
and if I add STDIN code like this,
==================
process.stdin.resume();
process.stdin.setEncoding('utf8');
process.stdin.on('data', function(chunk) {
process.stdout.write('data: ' + chunk);
});
process.stdin.on('end', function() {
process.stdout.write('end');
});
process.nextTick(function nextTick1(){
var a = 0;
while(true){
a++;
//console.log("CURRENT : "+a);
if(a%100000000==0){
console.log("CURRENT PER LONGTIME : "+a);
}
}
});
process.nextTick(function nextTick2(){
console.log("Next Tick");
});
setTimeout(function timeout(){
console.log("TIMEOUT");
}, 1000);
==================
this code's result emitted just only console.log() in "while loop".
Is this I/O Blocking?
node.js is non-block I/O?
I am confused this concept.
I'm sorry for asking you easiest question.
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