amphp / amp / 236

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Add boolean "keep_alive" option for all watcher types

This option determines if the watcher will keep the run() loop
from returning. By default all watchers set "keep_alive" => true.
Setting this value to false is ideal for registering non-crucial
watchers (e.g. cache invalidation timers) that should run for the
life of the program but shouldn't prevent the event loop from
returning if all essential tasks have completed.

    <?php
    echo "before run\n";
    run(function () {
        immediately(function () {
            echo "immediately\n";
        });
        once(function () {
            echo "once\n";
        }, 100, ["keep_alive" => false]);
        repeat(function () {
            echo "repeat\n";
        }, 500, ["keep_alive" => false]);
        echo "onStart end\n";
    });
    echo "after run\n";

The above snippet will have the following output:

before run
immediately
after run

The Amp\info() function now also reports the number of
keep_alive watchers currently registered via the "keep_alive" key.

155 of 155 new or added lines in 3 files covered. (100.0%)

1346 of 1397 relevant lines covered (96.35%)

34.19 hits per line