A preliminary exploration of swoole coroutine

Am currently learning swoole's coroutine, the characteristic of the coroutine is that it appears to be executed concurrently. Experiment with it.

Recommended for free: swoole

The premise of this article is that swoole has been installed on Linux. The latest version is 4.5.9 (2020-12-17)

Construct a requirement, create 5 coroutines at once, each coroutine sleeps a random number between 1 and 3 seconds, and then prints out For sleep time, we hope that when all programs end, the entire process takes up to 3 seconds.

1.php

foreach (range(1, 5) as $v) {
    go(function () {
        $sleep_time = random_int(1, 3);
        sleep($sleep_time);
        echo "睡眠了" . $sleep_time . "秒\n";
    });}

Using php 1.php to execute, the program can be executed, but it does not feel like a coroutine, but is executed synchronously. The entire execution takes far more than 3 seconds. It turns out there is a small bug here. You should use co:sleep, so that you can sleep within this coroutine without affecting the entire program.

2.php

foreach (range(1, 5) as $v) {
    go(function () {
        $sleep_time = random_int(1, 3);
        co::sleep($sleep_time);
        echo "睡眠了" . $sleep_time . "秒\n";
    });}

The results are as follows:

睡眠了1秒
睡眠了2秒
睡眠了2秒
睡眠了3秒
睡眠了3秒

In short, the coroutine that sleeps less must exit first, and the coroutine that sleeps for the same time prints out at the same time. character. And the total time taken at the end of the program is 3 seconds, indicating that the concurrency is successful.

Now I hope that after the 5 coroutines end, hello world can be printed!

3.php

foreach (range(1, 5) as $v) {
    go(function () {
        $sleep_time = random_int(1, 3);
        co::sleep($sleep_time);
        $a = random_int(1, 1000);
        echo "睡眠了" . $sleep_time . "秒\n";
    });}echo "hello world!\n";

The result is another problem, hello world is always printed first.
So, you need to use the coroutine container here.

4.php

Co\run(function () {
    foreach (range(1, 5) as $v) {
        go(function ()  {
            $sleep_time = random_int(1, 3);
            co::sleep($sleep_time);
            echo "睡眠了" . $sleep_time . "秒\n";
        });
    }});echo "hello world!\n";

The results are as follows:

睡眠了1秒
睡眠了2秒
睡眠了3秒
睡眠了3秒
睡眠了3秒
hello world!

The correct result can be printed this time, perfect!
swoole’s coroutine is still a bit interesting~

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