Hi!
Bad English here ;-)
Even with setImmediate, the output is the same.
I guess the problem is the while(true)
setImmediate(function nextTick1(){
var a = 0;
while(true){
a++;
//console.log("CURRENT : "+a);
if(a%100000000==0){
console.log("CURRENT PER LONGTIME : "+a);
}
}
});
Once nextTick1 TAKES CONTROL, the JavaScript thread in Node.js is dedicated
to it, no timeout, no next tick or setImmediate enqueued function will be
executed
Angel "Java" Lopez
@ajlopez
On Sat, Aug 10, 2013 at 8:57 AM, chamsae <[email protected]> wrote:
>
> 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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