You want to run two separate scripts worker1.js and worker2.js in parallel using fork. You also want to collect their results and print "All done" only after both finish. Which approach correctly achieves this?
AFork both scripts, listen for 'exit' events on both, then print after both exit.
BFork one script, then fork the second inside the first child's 'exit' event.
CFork both scripts and print "All done" immediately after forking.
DUse <code>exec</code> instead of <code>fork</code> to run scripts sequentially.
Step-by-Step Solution
Solution:
Step 1: Understand parallel execution with fork
Forking both scripts starts them in parallel. To know when both finish, listen for their 'exit' events.
Step 2: Wait for both exit events before printing
Track both exits with counters or flags, then print "All done" only after both have exited.
Final Answer:
Fork both scripts, listen for 'exit' events on both, then print after both exit. -> Option A
Quick Check:
Wait for both exits before printing = B [OK]
Quick Trick:Use 'exit' events on both children to sync completion [OK]
Common Mistakes:
Starting second child inside first child's exit
Printing before children finish
Using exec for parallel child processes
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