readsync-busy-loop.js

gistfile1.js

//
// test case: fs.readSync() eventually starts busy-looping in C++ land
//
// create a writer with `while true; do date >> /tmp/time.log; sleep 1; done`
// then run `node tail.js /tmp/time.log`
//
Buffer = require('buffer').Buffer;
fs = require('fs');

b = new Buffer(256);
fd = fs.openSync(process.argv[2], 'r');
while (true) {
        console.log('.'); // marker to make sure the loop isn't actually spinning
        fs.readSync(fd, b, 0, b.length, 0);
        console.log(b.toString());
}