A classe parallel\Runtime

    (0.8.0)

    Runtime Objects

    Cada tempo de execução representa um único thread PHP, o thread é criado (e inicializado) durante a construção. O thread então espera que as tarefas sejam agendadas: As tarefas agendadas serão executadas FIFO e então o thread continuará esperando até que mais tarefas sejam agendadas ou seja fechado, eliminado ou destruído pelas regras normais de escopo dos objetos PHP.

    Aviso

    Quando um tempo de execução é destruído pelas regras normais de escopo de objetos PHP, ele primeiro executará todas as tarefas que foram agendadas e bloqueará ao fazê-lo.

    Bootstrapping em tempo de execução

    Quando um novo tempo de execução é criado, ele não compartilha código com o thread (ou processo) que o criou. Isso significa que ele não possui as mesmas classes e funções carregadas, nem o mesmo conjunto de autoloader. Em alguns casos, um tempo de execução muito leve é desejável porque as tarefas que serão agendadas não precisam de acesso ao código no thread pai. Nos casos em que as tarefas precisam acessar o mesmo código, basta definir um autoloader como bootstrap.

    Nota:

    preloading pode ser usado em conjunto com o parallel; neste caso, o código pré-carregado está disponível sem inicialização

    Resumo da classe

    final class parallel\Runtime {
    /* Create */
    public __construct()
    public __construct(string $bootstrap)
    /* Execute */
    public run(Closure $task): ?Future
    public run(Closure $task, array $argv): ?Future
    /* Join */
    public close(): void
    public kill(): void
    }

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    User Contributed Notes 4 notes

    up
    22
    Luciano Vettoretti
    4 years ago
    basic-multithreading-test.php

    <?php
    use parallel\Runtime;
    use     parallel\Channel;

    $test = "this var is not accesible in a thread";

    // this function will be the threads
    $thread_function = function (int $id, Channel $ch) {
    // delay the first thread to simulate better multithreading
    // second thread always finishes first
    $sleep = ($id == 2) ? 1 : 2;
    sleep($sleep);

    // print thread id
    // so it's clear second thread goes first
    // and also you can make sure multithreading is working
    var_dump("thread $id sleep $sleep");

    // try to capture globals, but it's not possible
    echo '$GLOBALS["test"] = ';
    @    var_dump($GLOBALS["test"]);

    // the only way to share data is between channels
    $ch->send($sleep);
    };

    try {
    // each runtime represents a thread
    $r1 = new Runtime();
    $r2 = new Runtime();

    // channel where the date will be sharead
    $ch1 = new Channel();

    // args that will be sent to $thread_function
    $args = array();
    $args[0] = null;
    $args[1] = $ch1;

    // running thread 1
    $args[0] = 1;
    $r1->run($thread_function, $args);

    // running thread 2
    $args[0] = 2;
    $r2->run($thread_function, $args);

    // receive data from channel
    $x = $ch1->recv();
    $y = $ch1->recv();

    // close channel
    $ch1->close();

    echo     "\nData received by the channel: $x and $y";
    } catch (    Error $err) {
    echo     "\nError:", $err->getMessage();
    } catch (    Exception $e) {
    echo     "\nException:", $e->getMessage();
    }
    up
    4
    gam6itko
    2 years ago
    <?php

    // make sure that is really parallel execution (showcase2).
    // Then you use echo within task-function there is a real chance that the application will hang.
    // We should control Futures to avoid this behaviour.
    // You will get different output on each execution.

    use parallel\{Future, Runtime};

    const     THREADS_COUNT = 10;
    const     THREADS_I_MAX = 100;

    // executed within thread
    $task = static function (int $i, int $to): void {
    echo     "[enter$i]";
    for (    $j = 0; $j < $to; $j++) {
    echo     $i;
    }
    echo     "[exit$i]";
    };

    // creating a few threads
    $runtimeList = [];
    for (    $i = 0; $i < THREADS_COUNT; $i++) {
    $runtimeList[] = new Runtime();
    }
    // run all threads
    $futureList = [];
    foreach (    $runtimeList as $i => $runtime) {
    echo     "[run$i]";
    $futureList[] = $runtime->run($task, [$i, THREADS_I_MAX]);
    }

    // waiting until all threads are done
    // if you delete code bellow then your script will hang
    do {
    usleep(1);
    $allDone = array_reduce(
    $futureList,
    function (    bool $c, Future $future): bool {
    return     $c && $future->done();
    },
    true
    );
    } while (    false === $allDone);
    echo     "done\n";
    up
    0
    Mikhail Streltsov (admin at my-fantasy dot ru)
    1 year ago
    new Runtime() will reset some basic (before number 10+-) Linux signal.

    If you already set handle of signal by pcntl_signal function - you need do it again
    up
    0
    gam6itko
    2 years ago
    <?php

    // make sure that is really parallel execution
    // you will get different output on each script run

    use parallel\{Channel, Runtime};

    const     THREADS_COUNT = 5;
    const     THREADS_I_MAX = 10;

    $ch = new Channel();

    // executed within thread
    $task = static function (Channel $ch, int $i, int $to): void {
    echo     "[enter: $i]\n";
    for (    $j = 0; $j < $to; $j++) {
    $ch->send($i);
    }
    echo     "[exit: $i]\n";
    };

    // creating a few threads
    $runtimeList = [];
    for (    $i = 0; $i < THREADS_COUNT; $i++) {
    $runtimeList[] = new Runtime();
    }
    // run all threads
    foreach ($runtimeList as $i => $runtime) {
    echo     "[run: $i]\n";
    $runtime->run($task, [$ch, $i, THREADS_I_MAX]);
    }

    // reading messages from channel
    $queue = '';
    for (    $i = 0; $i < THREADS_COUNT * THREADS_I_MAX; $i++) {
    $queue .= $ch->recv();
    }
    $ch->close();

    echo     $queue . PHP_EOL;
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