time_sleep_until_basic.phpt

--TEST--
time_sleep_until() function - basic test for time_sleep_until()
--SKIPIF--
<?php
if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
if (!function_exists("time_sleep_until")) die('skip time_sleep_until() not available');
?>
--CREDITS--
Manuel Baldassarri mb@ideato.it
Michele Orselli mo@ideato.it
#PHPTestFest Cesena Italia on 2009-06-20
--FILE--
<?php
$time = microtime(true) + 2;
$sleepUntil = (int) $time;
var_dump(time_sleep_until($sleepUntil));
$now = microtime(true);
if (substr(PHP_OS, 0, 3) == 'WIN') {
    // on windows, time_sleep_until has millisecond accuracy while microtime() is accurate
    // to 10th of a second. this means there can be up to a .9 millisecond difference
    // which will fail this test. this test randomly fails on Windows and this is the cause.
    //
    // fix: round to nearest millisecond
    // passes for up to .5 milliseconds less, fails for more than .5 milliseconds
    // should be fine since time_sleep_until() on Windows is accurate to the
    // millisecond(.5 rounded up is 1 millisecond)
    // In practice, on slower machines even that can fail, so giving yet 50ms or more.
    $tmp = round($now, 3);
    $now = $tmp >= (int)$time ? $tmp : $tmp + .05;
}

// Add some tolerance for early wake on macos. Reason unknown.
if ($now + 0.002 >= $sleepUntil) {
    echo "Success\n";
} else {
    echo "Sleep until (before truncation): ", $time, "\n";
    echo "Sleep until: ", $sleepUntil, "\n";
    echo "Now: ", $now, "\n";
}

?>
--EXPECT--
bool(true)
Success