小编wen*_*liu的帖子

func Benchmark_foreach1(b *testing.B) {
        var test map[int]int
        test = make(map[int]int)
            for i := 0; i < 100000; i++ {
                        test[i] = 1
            }
            for i := 0; i < b.N; i++ {
                    for i, _ := range test {
                            if test[i] != 1 {
                                    panic("ds")
                            }
                    }
            }
}

func Benchmark_foreach2(b *testing.B) {
            var test map[int]int
            test = make(map[int]int)
            for i := 0; i < 100000; i++ {
                    test[i] = 1
            }
            for i := 0; i < b.N; i++ …

在golang中,sync.Mutex Lock和Unlock是usul操作,但是Lock和defer Unlock的正确顺序是什么？

mu.Lock()
defer mu.Unlock()

要么

defer mu.Unlock()
mu.Lock()

哪个最好？