Futexes optimize the time to obtain an uncontested lock without relying on the kernel; kernel intervention is required only for contested locks.

Futexes对获得非竞争锁的时间进行了优化，而不用依赖内核；只有对竞争的锁才需要内核干涉。

youdao

Futexes optimize the time to obtain an uncontested lock without relying on the kernel; kernel intervention is required only for contested locks.

Futexes对获得非竞争锁的时间进行了优化，而不用依赖内核；只有对竞争的锁才需要内核干涉。

youdao