Php Libevent超时循环退出
我在让PHP libevent扩展在超时时脱离循环时遇到了一些困难。以下是我根据PHP.net docs页面上的演示获得的信息:Php Libevent超时循环退出,php,libevent,event-loop,Php,Libevent,Event Loop,我在让PHP libevent扩展在超时时脱离循环时遇到了一些困难。以下是我根据PHP.net docs页面上的演示获得的信息: // From here: http://www.php.net/manual/en/libevent.examples.php function print_line($fd, $events, $arg) { static $max_requests = 0; $max_requests++; printf("Received even
// From here: http://www.php.net/manual/en/libevent.examples.php
function print_line($fd, $events, $arg) {
static $max_requests = 0;
$max_requests++;
printf("Received event: %s after %s\n%s", implode(getEventFlags($events)), getTimer(), fgets($fd));
if ($max_requests == 10) {
// exit loop after 3 writes
echo " [EXIT]\n";
event_base_loopexit($arg[1]);
}
}
// create base and event
$base = event_base_new();
$event = event_new();
getTimer(); // Initialise time
$fd = STDIN;
event_set($event, $fd, EV_READ | EV_PERSIST, "print_line", array($event, $base));
event_base_set($event, $base);
event_add($event, 2000000);
event_base_loop($base);
// extract flags from bitmask
function getEventFlags ($ebm) {
$expFlags = array('EV_TIMEOUT', 'EV_SIGNAL', 'EV_READ', 'EV_WRITE', 'EV_PERSIST');
$ret = array();
foreach ($expFlags as $exf) {
if ($ebm & constant($exf)) {
$ret[] = $exf;
}
}
return $ret;
}
// Used to track time!
function getTimer () {
static $ts;
if (is_null($ts)) {
$ts = microtime(true);
return "Timer initialised";
}
$newts = microtime(true);
$r = sprintf("Delta: %.3f", $newts - $ts);
$ts = $newts;
return $r;
}
我可以看到传递给event\u add
的超时值会影响传递给print\u line()的事件,如果这些事件之间的间隔超过2秒,我会得到EV\u超时
,而不是EV\u READ
。但是,我希望libevent在达到超时时立即调用print\u line
,而不是等待下一个事件来给我超时
我尝试过使用事件\u base\u loopexit($base,2000000)
,这会导致事件循环立即退出,而不会阻塞事件。我还尝试将EV\u TIMEOUT
传递到event\u set
,这似乎没有任何效果
以前有没有人设法让它工作过?我知道event_buffer_*stuff适用于超时,但是我想使用标准的event_base
函数。关于事件计时器函数和这些函数的讨论之一确实存在于我的系统中,但它们根本没有文档记录。问题在于fgets()中的:
这将阻止处理并等待来自STDIN的数据(但超时时没有)
换成这样:
$text = '';
if ($events & EV_READ) {
$text = fgets($fd);
}
printf("Received event: %s after %s\n%s", implode(getEventFlags($events)), getTimer(), $text);
$text = '';
if ($events & EV_READ) {
$text = fgets($fd);
}
printf("Received event: %s after %s\n%s", implode(getEventFlags($events)), getTimer(), $text);