如果当前数值等于参数1，则将当前数值设置为参数2
function swoole_atomic->cmpset(int $cmp_value, int $set_value);- 如果当前数值等于$cmp_value返回true，并将当前数值设置为$set_value
- 如果不等于返回false
- $cmp_value，$set_value 必须为小于42亿的整数
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