PHP - Manual: Ev::recommendedBackends
2024-11-15
Ev::recommendedBackends
(PECL ev >= 0.2.0)
Ev::recommendedBackends — Returns a bit mask of recommended backends for current platform
说明
final
public
static
Ev::recommendedBackends(): int
Returns the set of all backends compiled into this binary of
libev
and also recommended for this platform, meaning it will work for most file
descriptor types. This set is often smaller than the one returned by
ev_supported_backends()
, as for example
kqueue
is broken on most
BSD
systems and will not be auto-detected unless it is requested explicitly.
This is the set of backends that
libev
will probe no backends specified explicitly.
参数
此函数没有参数。
返回值
Returns a bit mask which can containing backend flags combined using bitwise OR operator.
范例
示例 #1 Embedding one loop into another
<?php
/*
* Try to get an embeddable event loop and embed it into the default event loop.
* If it is impossible, use the default
* loop. The default loop is stored in $loop_hi, while the embeddable loop is
* stored in $loop_lo(which is $loop_hi in the case no embeddable loop can be
* used).
*
* Sample translated to PHP
* http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#Examples_CONTENT-9
*/
$loop_hi = EvLoop::defaultLoop();
$loop_lo = NULL;
$embed = NULL;
/*
* See if there is a chance of getting one that works
* (flags' value of 0 means autodetection)
*/
$loop_lo = Ev::embeddableBackends() & Ev::recommendedBackends()
? new EvLoop(Ev::embeddableBackends() & Ev::recommendedBackends())
: 0;
if ($loop_lo) {
$embed = new EvEmbed($loop_lo, function () {});
} else {
$loop_lo = $loop_hi;
}
?>
参见
- EvEmbed
- Ev::embeddableBackends() - Returns the set of backends that are embeddable in other event loops
- Ev::supportedBackends() - Returns the set of backends supported by current libev configuration
- Backend flags
- Examples
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官方地址：https://www.php.net/manual/en/ev.recommendedbackends.php
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