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curl_multi_exec 解惑

WBOYOriginal: 2016-06-06 20:33:261330browse

<code>do {
    $mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);

while ($active && $mrc == CURLM_OK) {
    if (curl_multi_select($mh) != -1) {
        do {
            $mrc = curl_multi_exec($mh, $active);
        } while ($mrc == CURLM_CALL_MULTI_PERFORM);
    }
}
</code>

php 手册上看到这个函数，网上查资料说这样写为了避免CPU过高。但是不明白为什么这样写。第一次执行curl_muti_exec 已经把所有的句柄给执行，为什么还要再执行一次

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<code>do {
    $mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);

while ($active && $mrc == CURLM_OK) {
    if (curl_multi_select($mh) != -1) {
        do {
            $mrc = curl_multi_exec($mh, $active);
        } while ($mrc == CURLM_CALL_MULTI_PERFORM);
    }
}
</code>

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curl_multi_exec 解惑

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