Node.js의 이벤트 루프를 공부하면서 각 페이즈에서 어떤 코드들이 실행되는지 쉽게 확인하기 위해 로깅이 추가된 레포입니다.
nextTickQueue, microTaskQueue에 대한 로깅은 코드에 대한 이해 부족으로 구현하지 못했습니다. 만약 구현하시면 PR로 올려주시면 이벤트 루프를 공부하는 사람들에게 큰 도움이 될 것 같습니다 🙏
각자 컴퓨터 환경에 따라서 n은 적절하게 설정해서 빌드를 하면 ./node로 빌드된 Node를 실행할 수 있습니다. make의 j 옵션은 빌드를 할 때 병렬적으로 할당하는 작업의 개수를 말합니다.
-j [jobs], --jobs[=jobs]
Specifies the number of jobs (commands) to run simultaneously. If
there is more than one -j option, the last one is effective. If the
-j option is given without an argument, make will not limit the
number of jobs that can run simultaneously.
실행
setTimeout(() => {
console.log('setTimeout');
setImmediate(() => {
console.log('setImmediate 2');
});
}, 10);
setImmediate(() => {
console.log('setImmediate 1');
});
만약 위와 같은 코드를 작성하고 빌드된 Node로 실행을 하면 아래와 같은 결과가 나옵니다.
Timer Phase[uv__run_timers] Enter NO TIMER LEFT Timer Phase[uv__run_timers] Exit Pending Callbacks Phase[uv__run_pending] Enter Pending Callbacks Phase[uv__run_pending] Exit Calculated Poll Phase timeout = -1 Poll Phase[uv__io_pole] Enter POP DATA FROM QUEUE POP DATA FROM QUEUE POLL FOR timeout -1 Start Timer Phase[uv__run_timers] Enter FIND TIMER TOO EARLY TO EXECUTE TIMER CALLBACK 10971081432 > 10971081423 Timer Phase[uv__run_timers] Exit Pending Callbacks Phase[uv__run_pending] Enter Pending Callbacks Phase[uv__run_pending] Exit Calculated Poll Phase timeout = 0 Poll Phase[uv__io_pole] Enter POP DATA FROM QUEUE POP DATA FROM QUEUE POLL FOR timeout 0 Start POLL FOR End. polling result : 0 There is no completed I/O Request Poll Phase[uv__io_pole] Exit Check Phase[uv__run_check] Enter RUN CHECK PHASE CALLBACK START ==================== setImmediate 1 ==================== RUN CHECK PHASE CALLBACK END Check Phase[uv__run_check] Exit Close Callbacks Phase[uv__run_closing_handles] Enter Close Callbacks Phase[uv__run_closing_handles] Exit Timer Phase[uv__run_timers] Enter FIND TIMER TOO EARLY TO EXECUTE TIMER CALLBACK 10971081432 > 10971081426 Timer Phase[uv__run_timers] Exit Pending Callbacks Phase[uv__run_pending] Enter Pending Callbacks Phase[uv__run_pending] Exit Calculated Poll Phase timeout = 6 Poll Phase[uv__io_pole] Enter POLL FOR timeout 0 Start POLL FOR End. polling result : 0 There is no completed I/O Request Update Timeout 6 -> 6 POLL FOR timeout 6 Start POLL FOR End. polling result : 0 There is no completed I/O Request Poll Phase[uv__io_pole] Exit Check Phase[uv__run_check] Enter RUN CHECK PHASE CALLBACK START ==================== ==================== RUN CHECK PHASE CALLBACK END Check Phase[uv__run_check] Exit Close Callbacks Phase[uv__run_closing_handles] Enter Close Callbacks Phase[uv__run_closing_handles] Exit Timer Phase[uv__run_timers] Enter FIND TIMER RUN TIMER CALLBACK START ==================== setTimeout ==================== RUN TIMER CALLBACK END NO TIMER LEFT Timer Phase[uv__run_timers] Exit Pending Callbacks Phase[uv__run_pending] Enter Pending Callbacks Phase[uv__run_pending] Exit Calculated Poll Phase timeout = 0 Poll Phase[uv__io_pole] Enter POLL FOR timeout 0 Start POLL FOR End. polling result : 0 There is no completed I/O Request Poll Phase[uv__io_pole] Exit Check Phase[uv__run_check] Enter RUN CHECK PHASE CALLBACK START ==================== setImmediate 2 ==================== RUN CHECK PHASE CALLBACK END Check Phase[uv__run_check] Exit Close Callbacks Phase[uv__run_closing_handles] Enter Close Callbacks Phase[uv__run_closing_handles] Exit Timer Phase[uv__run_timers] Enter NO TIMER LEFT Timer Phase[uv__run_timers] Exit Pending Callbacks Phase[uv__run_pending] Enter Pending Callbacks Phase[uv__run_pending] Exit Calculated Poll Phase timeout = 0 Poll Phase[uv__io_pole] Enter POLL FOR timeout 0 Start POLL FOR End. polling result : 0 There is no completed I/O Request Poll Phase[uv__io_pole] Exit Check Phase[uv__run_check] Enter RUN CHECK PHASE CALLBACK START ==================== ==================== RUN CHECK PHASE CALLBACK END Check Phase[uv__run_check] Exit Close Callbacks Phase[uv__run_closing_handles] Enter Close Callbacks Phase[uv__run_closing_handles] Exit UV_RUN_ONCE Timer Phase[uv__run_timers] Enter NO TIMER LEFT Timer Phase[uv__run_timers] Exit Timer Phase[uv__run_timers] Enter NO TIMER LEFT Timer Phase[uv__run_timers] Exit Pending Callbacks Phase[uv__run_pending] Enter Pending Callbacks Phase[uv__run_pending] Exit Calculated Poll Phase timeout = 0 Poll Phase[uv__io_pole] Enter POLL FOR timeout 0 Start POLL FOR End. polling result : 0 There is no completed I/O Request Poll Phase[uv__io_pole] Exit Check Phase[uv__run_check] Enter RUN CHECK PHASE CALLBACK START ==================== ==================== RUN CHECK PHASE CALLBACK END Check Phase[uv__run_check] Exit Close Callbacks Phase[uv__run_closing_handles] Enter Close Callbacks Phase[uv__run_closing_handles] Exit UV_RUN_ONCE Timer Phase[uv__run_timers] Enter NO TIMER LEFT Timer Phase[uv__run_timers] Exit POLL FOR End. polling result : 1 RUN POLL CALLBACK START ==================== ==================== RUN POLL CALLBACK END Poll Phase[uv__io_pole] Exit Check Phase[uv__run_check] Enter RUN CHECK PHASE CALLBACK START ==================== ==================== RUN CHECK PHASE CALLBACK END Check Phase[uv__run_check] Exit Close Callbacks Phase[uv__run_closing_handles] Enter Close Callbacks Phase[uv__run_closing_handles] Exit Timer Phase[uv__run_timers] Enter NO TIMER LEFT Timer Phase[uv__run_timers] Exit Pending Callbacks Phase[uv__run_pending] Enter Pending Callbacks Phase[uv__run_pending] Exit Calculated Poll Phase timeout = 0 Poll Phase[uv__io_pole] Enter POP DATA FROM QUEUE POP DATA FROM QUEUE POLL FOR timeout 0 Start POLL FOR End. polling result : 0 There is no completed I/O Request Poll Phase[uv__io_pole] Exit Check Phase[uv__run_check] Enter RUN CHECK PHASE CALLBACK START ==================== ==================== RUN CHECK PHASE CALLBACK END Check Phase[uv__run_check] Exit Close Callbacks Phase[uv__run_closing_handles] Enter Close Callbacks Phase[uv__run_closing_handles] Exit UV_RUN_ONCE Timer Phase[uv__run_timers] Enter NO TIMER LEFT Timer Phase[uv__run_timers] Exit
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