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swoole_atomic->sub

减少计数

function swoole_atomic->sub(int $sub_value = 1)

$sub_value要减少的数值，默认为1
$sub_value必须为正整数
$sub_value与原值相减如果低于0将会溢出，高位数值会被丢弃
sub方法操作成功后返回结果数值