有缓冲的锁定模式吗？

为有限数量的客户端锁定某些资源的原语称为信号量。

使用缓冲通道很容易实现：

var semaphore = make(chan struct{}, 4) // allow four concurrent usersfunc f() {    // Grab the lock. Blocks as long as 4 other invocations of f are still running.    semaphore <- struct{}{}    // Release the lock once we're done.    defer func() { <-semaphore }()    // Do work...}