How does BufferedInputStream / BufferedReader behave in multithreaded code?

When using BufferedInputStream or BufferedReader in a multithreaded environment, concurrency issues may arise. These classes are not inherently thread-safe. This means that if multiple threads attempt to read from the same BufferedInputStream or BufferedReader instance, the results could be unpredictable. Proper synchronization mechanisms or creating separate instances for each thread is recommended to avoid data inconsistency and ensure thread safety.

For instance, it is crucial to ensure that if one thread is reading data, no other thread should access the same stream simultaneously. This can lead to corrupted or incomplete data being read.

Here’s a simple example of handling BufferedReader in a multithreaded context:


        <?php
        class ReaderThread extends Thread {
            private $reader;

            public function __construct($reader) {
                $this->reader = $reader;
            }

            public function run() {
                while (($line = $this->reader->readLine()) !== null) {
                    echo $line <br>;
                }
            }
        }

        $file = fopen("example.txt", "r");
        $bufferedReader = new BufferedReader($file);
        
        $threads = [];
        for ($i = 0; $i < 3; $i++) {
            $threads[$i] = new ReaderThread($bufferedReader);
            $threads[$i]->start();
        }

        foreach ($threads as $thread) {
            $thread->join();
        }
        fclose($file);
        ?>

How does BufferedInputStream / BufferedReader behave in multithreaded code?

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How does BufferedInputStream / BufferedReader behave in multithreaded code?

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